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Sexually Transmitted Disease Gallery

Bacterial vaginosis

This photomicrograph of a vaginal smear specimen depicts two epithelial cells, a normal cell, and an epithelial cell with its exterior covered by bacteria giving the cell a roughened, stippled appearance known as a “clue cell”. Clue cells are epithelial cells that have had bacteria adhere to their surface, obscuring their borders, and imparting a stippled appearance. The presence of such clue cells is a sign that the patient has bacterial vaginosis. Adapted from CDC
This photograph depicted a single Gardnerella vaginalis, formerly Haemophilus vaginalis, or Corynebacterium vaginalis, bacterial colony. The vagina is normally colonized by Lactobacillus spp., which help to regulate the region’s pH, maintaining it in the low range, thereby, inhibiting the growth of potentially-pathogenic organisms. The Gram-positive Gardnerella vaginalis bacterium is one such organism, and is a common cause for bacterial vaginosis (BV). Adapted from CDC
This photograph depicted a single Gardnerella vaginalis, formerly Haemophilus vaginalis, or Corynebacterium vaginalis, bacterial colony. The vagina is normally colonized by Lactobacillus spp., which help to regulate the region’s pH, maintaining it in the low range, thereby, inhibiting the growth of potentially-pathogenic organisms. The Gram-positive Gardnerella vaginalis bacterium is one such organism, and is a common cause for bacterial vaginosis (BV). Adapted from CDC
This photomicrograph reveals bacteria adhering to vaginal epithelial cells known as “clue cells”. “Clue cells” are epithelial cells that have had bacteria adhere to their surface, obscuring their borders, and imparting a stippled appearance. The presence of such clue cells is a sign that the patient has bacterial vaginosis. Adapted from CDC
This photomicrograph reveals bacteria adhering to vaginal epithelial cells known as “clue cells”. “Clue cells” are epithelial cells that have had bacteria adhere to their surface, obscuring their borders, and imparting a stippled appearance. The presence of such clue cells is a sign that the patient has bacterial vaginosis. Adapted from CDC

Chlamydia

Under a relatively-low magnification of 63X, this Gram-stained photomicrograph of a vaginal specimen revealed the presence of squamous epithelial cells, polymorphonuclear leukocytes (PMNs), or white blood cells (WBCs), and numerous Gram-positive bacilli, or rods. Vaginal specimens are reviewed for many reasons including the Pap test, tests for STDs such as human papilloma virus (HPV) and Chlamydia trachomatis, as well as others. The vagina is normally home to a number of bacterial organisms, referred to as vaginal microbiota, or vaginal microflora, composed primarily of rod-shaped Lactobacillus spp., as well as others. Adapted from CDC
Photomicrograph of Chlamydia trachomatis taken from a urethral scrape. Untreated, chlamydia can cause severe, costly reproductive and other health problems including both short- and long-term consequences, i.e. pelvic inflammatory disease (PID), infertility, and potentially fatal tubal pregnancy. Adapted from CDC
This McCoy cell monolayer micrograph reveals a number of intracellular C. trachomatis inclusion bodies; Magnified 50X. The intracellular inclusion body represents the replication phase of the Chlamydia spp. organisms, whereupon, the reorganized reticulate body (RB) multiplies through binary fission into 100-500 new RBs, which mature into elementary bodies (EB). Adapted from CDC
This image reveals a close view of a patient’s left eye with the upper lid retracted in order to reveal the inflamed conjunctival membrane lining the inside of both the upper and lower lids, due to what was determined to be a case of inclusion conjunctivitis, a type of conjunctival inflammation caused by the bacterium, Chlamydia trachomatis. Inclusion conjunctivitis, also known as chlamydial conjunctivitis, is more common in newborns. Symptoms include redness of the eye(s), swelling of the eyelids, and discharge of pus, usually 5 to 12 days after birth. Adapted from CDC
This photomicrograph depicts HeLa cells infected with Type-A Chlamydia trachomatis, Magnified 400X. The cell line of choice is McCoy, however a particular strain of HeLa cells, i.e. HeLa 299-24, can be used to culture C. trachomatis. For identification, either iodine or fluorescent antibody (FA) stains are usually used. Adapted from CDC
Under a low magnification of 12.5X, this photomicrograph reveals McCoy cell monolayers with Chlamydia trachomatis inclusion bodies. Chlamydia, caused by Chlamydia trachomatis, is the most common bacterial sexually transmitted infection. Using cell cultures from the McCoy cell line is one methods implemented in diagnosing Chlamydial infections. Adapted from CDC
This photomicrograph reveals McCoy cell monolayers with Chlamydia trachomatis inclusion bodies; Magnified 50X. Chlamydia, caused by Chlamydia trachomatis, is the most common bacterial sexually transmitted infection. Using cell cultures from the McCoy cell line is one methods implemented in diagnosing Chlamydial infections.Adapted from CDC
This photomicrograph reveals McCoy cell monolayers with Chlamydia trachomatis inclusion bodies; Magnified 200X. Chlamydia, caused by Chlamydia trachomatis, is the most common bacterial sexually transmitted infection. Using cell cultures from the McCoy cell line is one methods implemented in diagnosing Chlamydial infections. Adapted from CDC

Gonorrhea

This 1970 photograph revealed the presence of what was determined to be a secondary gonococcal lesion located on the distal finger tip of a patient who presented with a case of gonorrhea. Usually, secondary gonococcal lesions manifest themselves when a primary infection of the urogenital tract becomes disseminated throughout the body by way of the circulatory system.
This 1970 photograph revealed the presence of what was determined to be a gonococcal infection involving the cervix of a patient who presented with a case of gonorrhea. Note that there is a purulent discharge emanating from the cervical os, and pooling in the vagina.Adapted from CDC
This gonorrhoeae patient presented with gonococcal arthritis of the hand, which caused the hand and wrist to swell due to bacterium Neisseria gonorrhoeae. Adapted from CDC
This gonococcal arthritic patient presented with an inflammation of the skin of her right arm due to a disseminated Neisseria gonorrhoeaebacterial infection. Adapted from CDC
This patient presented with a cutaneous gonococcal lesion due to a disseminated Neisseria gonorrhea bacterial infection. Though a sexually transmitted disease, if a Gonorrhea infection is allowed to go untreated, the Neisseria gonorrhea bacteria responsible for the infection can become disseminated throughout the body, forming lesions in extra-genital locations. Adapted from CDC
This colposcopic view of this patient’s cervix reveled an eroded ostium due to Neisseria gonorrhea infection. A chronic Neisseria gonorrhea infection can lead to complications, which can be apparent such as this cervical inflammation, and some can be quite insipid, giving the impression that the infection has subsided, while treatment is still needed.Adapted from CDC
This patient presented with a lesion of the right hand due to a disseminated Neisseria gonorrhoeae bacteremia. Though a sexually transmitted disease, if a Gonorrhea infection is allowed to go untreated, the Neisseria gonorrhea bacteria responsible for the infection can become disseminated throughout the body, forming lesions in extra-genital locations.Adapted from CDC
This patient presented with urogenital complications from a case of gonorrhea including penile paraphimosis. Due to the accompanying inflammation brought on by the Neisseria gonorrhoeae infection, the foreskin becomes adherent to the glans penis resulting in a condition known as phimosis, and cannot be retracted in order to expose the entire glans. Adapted from CDC
This patient presented with a paraurethral abscess due to the spread of N. gonorrhoeae bacteria. In this case, the spread of the bacterial pathogen from its initial urethral site of origin to the surrounding penile tissues brought on the formation of an abscess, which was one of three that had formed in this manner.Adapted from CDC
This patient presented with cutaneous foot lesions that were diagnosed as a disseminated gonococcal infection. Gonorrhea is the most frequently reported communicable disease in the U.S. Disseminated gonococcal infection is most often the cause of acute septic arthritis in sexually active adults, and the reason for most hospitalizations due to infective arthritis.Adapted from CDC
This patient presented with a cutaneous lesion that was traced to a systemically disseminated gonoccal infection. Though a sexually transmitted disease, if a Gonorrhea infection is allowed to go untreated, the Neisseria gonorrhea bacteria responsible for the infection can become disseminated throughout the body, forming lesions in extra-genital locations.Adapted from CDC
Here, a specimen is about to be collected from this patient who presented with symptoms including a penile discharge. Most Neisseria and related species are normal flora in humans and animals, however, some species such as N. gonorrhoeae are pathogens in normal hosts and those species known to be commensal, may be opportunistic pathogens. Adapted from CDC
This patient presented with a cutaneous lesion on the palm of his right hand due to a N. gonorrhoeae infection. Though sexually transmitted, and involving the urogenital tract initially, a Neisseria gonorrhoeae bacterial infection can become disseminated systemically, manifesting itself as a cutaneous erythematous lesion anywhere on the body. Adapted from CDC
His patient presented with cutaneous lesions on his left ankle and calf due to a disseminated N. gonorrhoeae infection. Though sexually transmitted, and involving the urogenital tract initially, a Neisseria gonorrhoeae bacterial infection can become disseminated systemically, manifesting itself as a cutaneous erythematous lesion anywhere on the body.
This patient presented with cutaneous lesions on the right forearm and left hand due to a N. gonorrhoeae infection. Though sexually transmitted, and involving the urogenital tract initially, a Neisseria gonorrhoeae bacterial infection can become disseminated systemically, manifesting itself as a cutaneous erythematous lesion anywhere on the body.
This patient presented with ophthalmic inflammation that was diagnosed as gonococcal conjunctivitis. Though sexually transmitted, and involving the urogenital tract initially, a Neisseria gonorrhoeae bacterial infection can become disseminated systemically, manifesting itself as cutaneous ulcerations or conjunctival inflammation.
A highly contagious infection, gonococcal ophthalmia is due the pathogenic bacteria Neisseria gonorrhoeae. This case involved an adult patient with a systemically disseminated gonococcal infection, but neonates are in danger of acquiring this ophthalmic infection at the time of their delivery when the mother is infected with N. gonorrhoeae bacteria.Adapted from CDC
This case of gonorrheal conjunctivitis resulted in partial blindness due to the spread of N. gonorrhoeae bacteria. Gonococci cause both localized infections, usually in the genital tract, and disseminated infections with seeding of various organs. Diagnosis of localized infections depends on Gram-staining, and culture of the discharge.Adapted from CDC
The early lesion on this patient’s left index finger was due to the systemic dissemination of N. gonorrhoeae bacteria. Though sexually transmitted, and involving the urogenital tract initially, a Neisseria gonorrhoeae bacterial infection can become disseminated systemically, manifesting itself as a cutaneous erythematous lesion anywhere on the body.Adapted from CDC
The lesion on this patient’s left hand was due to the systemic dissemination of the Neisseria gonorrhoeae bacteria. Though sexually transmitted, and involving the urogenital tract initially, a Neisseria gonorrhoeae bacterial infection can become disseminated systemically, manifesting itself as a cutaneous erythematous lesion anywhere on the body.Adapted from CDC
The lesion on this patient’s heel was due to the systemic dissemination of the N. gonorrhoeae bacteria. Gonorrhea is the most frequently reported communicable disease in the U.S. Disseminated gonococcal infection is most often the cause of acute septic arthritis in sexually active adults, and the reason for most hospitalizations due to infective arthritis.Adapted from CDC
Note the cloudiness of this patient's right eye in this case of gonococcal conjunctivitis due to N. gonorrhoeae bacteria. Gonococcal conjunctivitis in caused by a direct inoculation of the conjunctival membrane of the eye with Neisseria gonorrhoeae bacteria, causing this membrane covering the eye to become inflamed, edematous, and produce a purulent exudate.Adapted from CDC
This patient presented with a penile meatal discharge which was diagnosed as gonorrhea. When collecting a male specimen, if no discharge is evident, the urethra is stripped towards the orifice to express some pus. A thin sterile swab is then inserted 23 cm into the urethra and rotated before being withdrawn.Adapted from CDC
This patient presented with a case of gonorrhea with symptoms including cervicitis and vaginal discharge. Gonorrhea is the most frequently reported communicable disease in the U.S. Disseminated gonococcal infection is most often the cause of acute septic arthritis in sexually active adults, and the reason for most hospitalizations due to infective arthritis.Adapted from CDC
This male presented with purulent penile discharge due to gonorrhea with an overlying penile pyodermal lesion. Pyoderma involves the formation of a purulent skin lesion as in this case located on the glans penis, and overlying the sexually transmitted disease gonorrhea. Adapted from CDC
This male presented with a purulent penile discharge due to gonorrhea with an overlying penile pyodermal lesion. Pyoderma involves the formation of a purulent skin lesion, in this case located on the glans penis, and overlying the sexually transmitted disease gonorrhea.Adapted from CDC
This patient presented with symptoms later diagnosed as due to Gonococcal pharyngitis.Gonococcal pharyngitis is a sexually-transmitted disease acquired through oral sex with an infected partner. The majority of throat infections caused by gonococci have no symptoms, but some can suffer from mild to severe sore throat.Adapted from CDC
This technician is collecting a specimen from a male suspected of having gonorrhea. When collecting a male specimen, if no discharge is evident, the urethra is “stripped” towards the orifice to express some pus. A thin sterile swab is then inserted 23cm into the urethra and rotated before being withdrawn. Adapted from CDC

This technician is collecting a specimen from a male suspected of having gonorrhea. When collecting a male specimen, if no discharge is evident, the urethra is “stripped” towards the orifice to express some pus. A thin sterile swab is then inserted 23cm into the urethra and rotated before being withdrawn. Adapted from CDC
This patient presented with a gonorrheal ecthyma on the skin due to systemically disseminated N. gonorrhoeae bacteria. An ecthyma is a cutaneous eruption consisting of a large, round pustule on an inflamed base caused by untreated gonococcal bacteria spread systemically throughout the bloodstream.Adapted from CDC
This was a skin lesion on a patient with gonorrhea due to the systemic spread of N. gonorrhoeae bacteria. Gonorrhea is caused by Neisseria gonorrhoeae. If left untreated, will enter the blood, thereby, spreading throughout the body. As is shown here, such full body dissemination may manifest itself as skin lesions throughout the body.Adapted from CDC
This was a newborn with gonococcal ophthalmia neonatorum caused by a maternally transmitted gonococcal infection. Unless preventative measures are taken, it is estimated that gonococcal ophthalmia neonatorum will develop in 28% of infants born to women with gonorrhea. It affects the corneal epithelium causing microbial keratitis, ulceration and perforation.Adapted from CDC
This patient with diagnosed gonococcal urethritis presented with unilateral gonococcal conjunctivitis. See PHIL 16400, for the appearance of her eye 24 hours following treatment with 4.8 million units of aqueous procaine penicillin G (APPG) and probenicid. If untreated N. gonorrhoeae bacteria may spread to the bloodstream, and thereby, throughout the body. The most common symptoms are then rash and joint pains, but other generalized symptoms may result as well such as conjunctivitis.Adapted from CDC
This patient presented with gonorrhea and a disseminated gonococcal skin infection about the ankle. Gonorrhea, caused by Neisseria gonorrhoeae, if left untreated will enter the blood, thereby, spreading throughout the body. As is shown here, such full body dissemination may manifest itself as skin lesions throughout the body.Adapted from CDC
This is a photograph of a skin lesion on a patient diagnosed with gonorrhea. Gonorrhea, caused by Neisseria gonorrhoeae, if left untreated will enter the blood, thereby, spreading throughout the body. As is shown here, such full body dissemination may manifest itself as skin lesions throughout the body.Adapted from CDC
This is a skin lesion in a patient with systemically disseminated Neisseria gonorrhoeae bacteria. Gonorrhea, caused by Neisseria gonorrhoeae, if left untreated will enter the blood, thereby, spreading throughout the body. As is shown here, such fully systemic dissemination may manifest itself as skin lesions throughout the body.Adapted from CDC
Here a technician is about to collect an intraurethral specimen to be tested for gonorrhea, or non-specific urethritis. Doctors or other health care workers usually use three laboratory techniques to diagnose gonorrhea: staining samples directly for the bacterium, detection of bacterial genes or DNA in the urine, and growing the bacteria in laboratory cultures.Adapted from CDC
This photograph shows the collection of a specimen from a male suspected of having gonorrhea.When collecting a male specimen, if no discharge is evident, the urethra is stripped towards the orifice to express some pus. A thin sterile swab is then inserted 23 cm into the urethra and rotated before being withdrawn.Adapted from CDC
The foot of this patient is swollen due to gonococcal arthritis. Gonorrhea is the most frequently reported communicable disease in the U.S. Disseminated gonococcal infection is most often the cause of acute septic arthritis in sexually active adults, and the reason for most hospitalizations due to infective arthritis.Adapted from CDC
Note the gonococcal lesion on the skin of the left arm due to the bacterium Neisseria gonorrhoeae. N. gonorrhoeae, a gram-negative diplococcus, is the causative agent for Gonorrhea. Though these bacteria can infect the genital tract, the mouth, and the rectum, they can become disseminated throughout a person’s bloodstream. Adapted from CDC
Close-up of a gonococcal lesion on the skin of a patient’s arm. Gonorrhea, caused by Neisseria gonorrhoeae, if left untreated will enter the blood, thereby, spreading throughout the body. As is shown here, such full body dissemination may manifest itself as skin lesions in the form of gray pustules. Adapted from CDC

Genital Herpes

Viewed from the right posterior-oblique view, the male patient depicted here was in bed, in a clinical setting, and had presented with a pancorporeal maculopapular rash, which was initially thought to be a possible case of smallpox, but which later, was diagnosed as herpes simplex. Here you see the patient’s feet from a left lateral perspective revealing papules on the dorsal surface of the left foot. Herpes simplex virus, otherwise known as Herpesvirus hominis is a member of a group of viruses including those which cause oral herpes, i.e., usually HSV-1, and genital herpes, i.e., usually HSV-2. The virus can become disseminated, as was the case here, usually involving patients who are immunocompromised such as in the case of AIDS, or undergoing chemotherapeutic treatment. Adapted from CDC
Viewed from the right posterior-oblique view, the male patient depicted here was in bed, in a clinical setting, and had presented with a pancorporeal maculopapular rash, which was initially thought to be a possible case of smallpox, but which later, was diagnosed as herpes simplex. Herpes simplex virus, otherwise known as Herpesvirus hominis is a member of a group of viruses including those which cause oral herpes, i.e., usually HSV-1, and genital herpes, i.e., usually HSV-2. The virus can become disseminated, as was the case here, usually involving patients who are immunocompromised such as in the case of AIDS, or undergoing chemotherapeutic treatment.Adapted from CDC
This male patient presented with maculopapular lesions on the distal penile shaft that were first thought to be due to syphilis, but through the process of conducting a differential diagnosis, was later determined to be due to a Herpesviridae infection. Herpes simplex virus, otherwise known as Herpesvirus hominis is a member of a group of viruses including those which cause oral herpes, i.e., usually HSV-1, and genital herpes, i.e., usually HSV-2.Adapted from CDC
This was a posterior view of the back and buttocks of a male patient, in a clinical setting, who had presented with a pancorporeal maculopapular rash, which was initially thought to be a possible case of smallpox, but which later, was diagnosed as herpes simplex. Herpes simplex virus, otherwise known as Herpesvirus hominis is a member of a group of viruses including those which cause oral herpes, i.e., usually HSV-1, and genital herpes, i.e., usually HSV-2. The virus can become disseminated, as was the case here, usually involving patients who are immunocompromised such as in the case of AIDS, or undergoing chemotherapeutic treatment.Adapted from CDC
The male patient depicted here was in bed, in a clinical setting, and had presented with a pancorporeal maculopapular rash, which was initially thought to be a possible case of smallpox, but which later, was diagnosed as herpes simplex. See PHIL 15819, for another view of this patient in the same setting. Herpes simplex virus, otherwise known as Herpesvirus hominis is a member of a group of viruses including those which cause oral herpes, i.e., usually HSV-1, and genital herpes, i.e., usually HSV-2. The virus can become disseminated, as was the case here, usually involving patients who are immunocompromised such as in the case of AIDS, or undergoing chemotherapeutic treatment.Adapted from CDC
This image depicts the right foot of an infant born with a herpes simplex infection, known as neonatal herpes, or herpes simplex neonatorum, which had manifested itself through the development of maculopapular lesions of the foot’s heal and sole. See PHIL 6510, for another view of this condition.Adapted from CDC
This image depicts the perineal region of a male patient which displayed a perianal mucocutaneous lesion caused by a herpes simplex infection. Genital herpes is a sexually transmitted disease (STD) caused by the herpes simplex viruses type 1 (HSV-1) or type 2 (HSV-2). Most genital herpes is caused by HSV-2. Most individuals have no or only minimal signs or symptoms from HSV-1 or HSV-2 infection. When signs do occur, they typically appear as one or more blisters on or around the genitals or rectum. The blisters break, leaving tender ulcers (sores) that may take two to four weeks to heal the first time they occur. Typically, another outbreak can appear weeks or months after the first, but it almost always is less severe and shorter than the first outbreak. Although the infection can stay in the body indefinitely, the number of outbreaks tends to decrease over a period of years. Adapted from CDC
This neonate displayed a maculopapular outbreak on his feet due to congenitally acquired herpes simplex virus. In this instance, due to the age of the patient, this condition is known as herpes simplex neonatorum. See PHIL 15115, for a closer view of these lesions. Genital HSV can cause potentially fatal infections in babies. It is important that women avoid contracting herpes during pregnancy because a first episode during pregnancy causes a greater risk of transmission to the baby. If a woman has active genital herpes at delivery, a cesarean delivery is usually performed. Fortunately, infection of a baby from a woman with herpes infection is rare.Adapted from CDC
This 7 year old child with a history of recurrent herpes labialis presented with a periocular herpes simplex vesicular outbreak. Herpes simplex virus, otherwise known as Herpesvirus hominis is a member of a group of viruses including those which cause oral herpes (herpes labialis), i.e., usually HSV-1, and genital herpes, i.e., usually HSV-2. Adapted from CDC
This patient presented with what were recurrent characteristic vesiculopapular herpes simplex lesions on his anterior thigh. These early vesiculopapular herpetic lesions on the anterior thigh (Cntr) had yet to rupture. Herpes simplex virus is a member of a group of viruses including those which cause oral herpes (usually HSV-1), and genital herpes (usually HSV-2). Adapted from CDC
This male presented with primary vesiculopapular herpes genitalis lesion at the base of his penis due to the HSV-2 serotype. Herpes simplex virus, otherwise known as Herpesvirus hominis is a member of a group of viruses including those which cause oral herpes (herpes labialis), i.e., usually HSV-1, and genital herpes, i.e., usually HSV-2.
This patient presented with what was diagnosed as a herpes genitalis outbreak on the penile shaft due to HSV-2. Genital herpes is a sexually transmitted disease caused by the herpes simplex viruses type 1 (HSV-1), and type 2 (HSV-2). Most genital herpes is caused by HSV-2. Symptoms typically include one or more blisters on or around the genitals or rectum. Adapted from CDC
This patient presented with what was diagnosed as a herpes genitalis outbreak on the penile shaft due to HSV-2. Genital herpes is a sexually transmitted disease caused by the herpes simplex viruses type 1 (HSV-1), and type 2 (HSV-2). Most genital herpes is caused by HSV-2. Symptoms typically include one or more blisters on or around the genitals or rectum. Adapted from CDC
This patient presented with what was differentially diagnosed as a herpes genitalis outbreak on the penile glans and shaft. Note that what at first appears as erythematous areas are actually coalescence of herpes genitalis “micro-ulcers”. Genital herpes is a sexually transmitted disease (STD) caused by the herpes simplex viruses type 1 (HSV-1) and type 2 (HSV-2). Adapted from CDC
This male presented with primary vesiculopapular herpes genitalis lesions on his glans penis, and penile shaft. When signs of herpes genitalis do occur, they typically appear as one or more blisters on or around the genitals or rectum. The blisters break, leaving tender ulcers (sores) that may take two to four weeks to heal the first time they occur.
This 7 year old child with history of recurrent herpes labialis presented with a periocular herpes simplex vesicular outbreak. Herpes simplex virus, otherwise known as Herpesvirus hominis is a member of a group of viruses including those which cause oral herpes (herpes labialis), i.e., usually HSV-1, and genital herpes, i.e., usually HSV-2.Adapted from CDC
This male patient presented with a maculopapular herpetic rash on the penile shaft and corona of the glans penis. When signs of genital herpes do occur, they typically appear as one or more blisters on or around the genitals or rectum. The blisters break, leaving tender ulcers (sores) that may take two to four weeks to heal the first time they appear. Adapted from CDC
This 7 year old child presented with a generalized herpes simplex vesiculopapular rash over his trunk 5 days after onset. Herpes simplex virus, otherwise known as Herpesvirus hominis is a member of a group of viruses including those which cause oral herpes, i.e., usually HSV-1, and genital herpes, i.e., usually HSV-2.
This patient presented with a generalized Herpes hominis vesiculopapular rash over the dorsum of the left foot. Herpesvirus hominis, otherwise known as “herpes simplex virus” is a member of a group of viruses including those which cause oral herpes, i.e., usually HSV-1, and genital herpes, i.e., usually HSV-2. Adapted from CDC
This was an outbreak of herpes genitalis manifested as blistering around the vaginal introitus due to the HSV-2 virus. The sexually transmitted herpes simplex virus type-2 (HSV-2) typically causes one or more blisters to form on, or around the genitals or rectum, which break, leaving tender ulcers that may take 2-4 wks to heal after making their initial appearance.Adapted from CDC
Herpes simplex ulcerations on the lateral plantar surface of an infant’s foot. Women who acquire genital herpes during pregnancy can transmit the virus to their babies. Untreated Herpes Simplex Virus (HSV) infections in newborns can result in mental retardation and death.Adapted from CDC
Blisters on the vulva due to a recurring Herpes II (HSV-2) virus infection. Symptoms from HSV-1 or HSV-2 infection, when signs do occur, typically appear as one or more blisters on or around the genitals or rectum. The blisters break, leaving tender ulcers (sores) that may take two to four weeks to heal the first time they occur. Adapted from CDC
Blisters on the penis due to a recurring Herpes II (HSV-2) virus infection. Symptoms from HSV-1 or HSV-2 infection, when signs do occur, typically appear as one or more blisters on or around the genitals or rectum. The blisters break, leaving tender ulcers (sores) that may take two to four weeks to heal the first time they occur. Adapted from CDC

Human papillomavirus

Lymphogranuloma venereum

Pubic lice infestation

This 2006 image depicted five body lice, Pediculus humanus var. corporis, which from left to right included three nymphal-staged lice, beginning with a stage N1, then N2, and thirdly a N3-staged nymph, followed by an adult male louse, and finally an adult female louse. Lice are parasitic insects that can be found on people's heads, and bodies, including the pubic area. Human lice survive by feeding on human blood. Lice found on each area of the body are different from each other. The three types of lice that live on humans are: Pediculus humanus capitis (head louse), Pediculus humanus corporis (body louse, clothes louse) and Phthirus pubis ("crab" louse, pubic louse). Only the body louse is known to spread disease. Lice infestations are spread most commonly by close person-to-person contact. Dogs, cats, and other pets do not play a role in the transmission of human lice. Lice move by crawling; they cannot hop or fly. Both over-the-counter and prescription medications are available for treatment of lice infestations. Adapted from CDC
This photomicrograph depicts a dorsal view of an adult female human head louse, Pediculus humanus capitis. Lice are parasitic insects that can be found on people's heads, and bodies, including the pubic area. Human lice survive by feeding on human blood. Lice found on each area of the body are different from each other. The three types of lice that live on humans are: Pediculus humanus capitis (head louse), Pediculus humanus corporis (body louse, clothes louse) and Pthirus pubis ("crab" louse, pubic louse). Only the body louse is known to spread disease. Lice infestations (pediculosis and pthiriasis) are spread most commonly by close person-to-person contact. Dogs, cats, and other pets do not play a role in the transmission of human lice. Lice move by crawling; they cannot hop or fly. Both over-the-counter and prescription medications are available for treatment of lice infestations. Adapted from CDC
This illustration depicts a dorsal view of a “crab louse”, Phthirus pubis, a member of the suborder Anoplura, or “sucking lice”. The crab louse Phthirus pubis, is not known to carry disease producing organisms. Infestations usually occur in the pubic region of humans, and may occasionally be found on other coarse body hair, such as hair on the legs, armpits, mustache, beard, eyebrows, or eyelashes. Infestations of young children are usually on the eyebrows or eyelashes. Lice found on the head are not pubic lice; they are head lice. Adapted from CDC
This illustration depicts some of the morphologic differences seen in two “sucking lice” of the Order Annoplura. The louse on the left is a “body louse”, Pediculus humanus var. corporis, and the louse on the right is a “crab” or “pubic louse”, Phthirus pubis. Note that both of these lice are wingless, and possess three pairs of claw-tipped legs, which allows them to firmly grasp the hair shafts to which they remain attached as human ectoparasitic pests. Adapted from CDC
This photograph reveals the presence of crab lice, Phthirus pubis with reddish-brown crab feces. Pubic lice are generally found in the genital area on pubic hair; but may occasionally be found on other coarse body hair, such as hair on the legs, armpit, mustache, beard, eyebrows, and eyelashes. Adapted from CDC
This is an illustration comparing the Head Louse, Pediculus humanus, with the Pubic Louse, Phthirus pubis. These insects use their hook-like appendages to grasp unto the hair shafts of their hosts in body regions unique to its species, i.e. the head louse infests the head region of its host, while the pubic louse infests its host’s pubic region. Adapted from CDC
This patient presented with an infestation of Phthirus pubis, or crab lice. A Phthirus pubis infestation has caused the erythematous lesions seen in the pubic region of this patient in response to the bites of the crab lice arthropods. Adapted from CDC
This image depicts a dorsal view of a female head louse, Pediculus humanus var. capitis. Lice are parasitic insects that can be found on people's heads, and bodies, including the pubic area. Human lice survive by feeding on human blood. Lice found on each area of the body are different from each other. The three types of lice that live on humans are: Pediculus humanus var. capitis (head louse), Pediculus humanus var. corporis (body louse, clothes louse) and Pthirus pubis ("crab" louse, pubic louse). Only the body louse is known to spread disease. Lice infestations (pediculosis and pthiriasis) are spread most commonly by close person-to-person contact. Dogs, cats, and other pets do not play a role in the transmission of human lice. Lice move by crawling; they cannot hop or fly. Both over-the-counter and prescription medications are available for treatment of lice infestations. Adapted from CDC

Scabies

Under a moderate modification, this photomicrograph revealed the histopathologic changes in a human skin sample from the site of a number of scabies burrows, due to an infestation of Sarcoptes scabiei var. hominis. Note that the scabies had burrowed into the upper layers of this patient’s skin, into the epidermis, superficial to the stratum basale, also known as the stratum germinativum. The most common signs and symptoms of scabies are intense itching (pruritus), especially at night, and a pimple-like (papular) itchy rash. The itching and rash each may affect much of the body or be limited to common sites such as the wrist, elbow, armpit, webbing between the fingers, nipple, penis, waist, belt-line, and buttocks. The rash also can include tiny blisters (vesicles) and scales. Scratching the rash can cause skin sores; sometimes these sores become infected by bacteria. Adapted from CDC
This image depicts the anterior aspect of a patient’s lower legs, either of which displaying the pathologic consequences of an infestation of Sarcoptes scabiei var. hominis, otherwise known as scabies. Of note, were the secondary severe excoriations, resulting from the patient having scratched at the primary maculopapular rash caused by the scabies bites. The most common signs and symptoms of scabies are intense itching (pruritus), especially at night, and a pimple-like (papular) itchy rash. The itching and rash each may affect much of the body or be limited to common sites such as the wrist, elbow, armpit, webbing between the fingers, nipple, penis, waist, belt-line, and buttocks. The rash also can include tiny blisters (vesicles) and scales. Scratching the rash can cause skin sores; sometimes these sores become infected by bacteria. Adapted from CDC
This close view of the genitalia of a male patient reveals the presence of erosive, inflamed lesions, which had been caused by an infestation of scabies, Sarcoptes scabiei var. hominis. The lesions are on the penile glans, and the preputial skin. The most common signs and symptoms of scabies are intense itching (pruritus), especially at night, and a pimple-like (papular) itchy rash. The itching and rash each may affect much of the body or be limited to common sites such as the wrist, elbow, armpit, webbing between the fingers, nipple, penis, waist, belt-line, and buttocks. The rash also can include tiny blisters (vesicles) and scales. Scratching the rash can cause skin sores; sometimes these sores become infected by bacteria. Adapted from CDC
This photograph depicting the dorsal surface of a human hand focused on the interdigital web space between the index and middle fingers, and revealed the presence of papules due to an infestation of the human itch mite, Sarcoptes scabiei var. hominis, otherwise commonly known as scabies. The most common signs and symptoms of scabies are intense itching (pruritus), especially at night, and a pimple-like (papular) itchy rash. The itching and rash each may affect much of the body or be limited to common sites such as the wrist, elbow, armpit, webbing between the fingers, nipple, penis, waist, belt-line, and buttocks. The rash also can include tiny blisters (vesicles) and scales. Scratching the rash can cause skin sores; sometimes these sores become infected by bacteria. Adapted from CDC
The right axillary region of this male patient exhibited a papular rash, which had been caused by an infestation of the human itch mite, Sarcoptes scabiei var. hominis, otherwise commonly known as scabies. The most common signs and symptoms of scabies are intense itching (pruritus), especially at night, and a pimple-like (papular) itchy rash. The itching and rash each may affect much of the body or be limited to common sites such as the wrist, elbow, armpit, webbing between the fingers, nipple, penis, waist, belt-line, and buttocks. The rash also can include tiny blisters (vesicles) and scales. Scratching the rash can cause skin sores; sometimes these sores become infected by bacteria. Adapted from CDC
This photomicrograph reveals a single human itch mite, Sarcoptes scabiei var. hominis, otherwise commonly known as scabies, that had burrowed itself into the epidermal layers of a skin tissue sample extracted from an unknown host. The microscopic scabies mite burrows into the upper layer of the skin where it lives and lays its eggs. The most common symptoms of scabies are intense itching and a pimple-like skin rash. The scabies mite usually is spread by direct, prolonged, skin-to-skin contact with a person who has scabies. Scabies occurs worldwide and affects people of all races and social classes. Scabies can spread rapidly under crowded conditions where close body contact is frequent. Institutions such as nursing homes, extended-care facilities, and prisons are often sites of scabies outbreaks. Adapted from CDC
This woman presented with a rash composed of pimple-like irritations on the abdomen and thorax due to canine scabies. If an animal is infested with scabies, or mange, and comes in close contact with humans, the mites can get under the skin causing itching and irritation. However, this form of scabies is mild, and the mites die in a couple of days without reproducing. Adapted from CDC

Syphilis

Description Adapted from CDC

Description Adapted from CDC

Trichomoniasis

This photomicrograph of a wet-mounted vaginal discharge specimen, reveals numbers of Trichomonas vaginalis protozoan parasites, leading to a diagnosis of trichomoniasis, or “trich”, which is a very common sexually transmitted disease (STD) that is caused by infection with T. vaginalis. Although symptoms of the disease vary, most women and men who have the parasite cannot tell they are infected. The parasite is passed from an infected person to an uninfected person during sex. In women, the most commonly infected part of the body is the lower genital tract (vulva, vagina, or urethra), and in men, the most commonly infected body part is the inside of the penis (urethra). During sex, the parasite is usually transmitted from a penis to a vagina, or from a vagina to a penis, but it can also be passed from a vagina to another vagina. It is not common for the parasite to infect other body parts, like the hands, mouth, or anus. It is unclear why some people with the infection get symptoms while others do not, but it probably depends on factors like the person’s age and overall health. Infected people without symptoms can still pass the infection on to others. Adapted from CDC
This patient presented with a "strawberry cervix” due to a Trichomonas vaginalis infection, or trichomoniasis. The term “strawberry cervix” is used to describe the appearance of the cervix due to the presence of T. vaginalis protozoa. The cervical mucosa reveals punctate hemorrhages along with accompanying vesicles or papules.

Parasite Gallery

A

Acanthocephaliasis

Bolbosoma spp.

Transverse section through the body wall of Bolbosoma sp. in an intestinal biopsy specimen, stained with H&E. Image taken at 100x magnification. Cetaceans are the normal definitive hosts for Bolbosoma spp., and humans usually become infected after eating under-cooked fish which serve as paratenic hosts for the parasite.
Adapted from CDC
Higher-magnification (200x) of the specimen in Figure 1. Identifiable in this image are the characteristic thin cuticle (CU, black arrow), syncytial epidermis (EP), longitudinal muscles (blue arrows) and eggs (green arrows).
Adapted from CDC
Transverse section through the body wall of Bolbosoma sp. in an intestinal biopsy specimen, stained with H&E. Image taken at 100x magnification. In this image, a portion of the reproductive system is visible within the pseudocoelom.
Adapted from CDC

Moniliformis moniliformis

Eggs of M. moniliformis

Eggs of M. moniliformis liberated from an adult worm that was recovered from the stool of a patient.
Adapted from CDC
Egg of M. moniliformis liberated from an adult worm that was recovered from the stool of a patient.
Adapted from CDC

Adults of M. moniliformis

Adult of M. moniliformis.
Adapted from CDC
Adult of M. moniliformis.
Adapted from CDC
Higher magnification of the anterior end of the specimen in Figures 1 and 2, showing a close-up of the proboscis.
Adapted from CDC
Higher magnification of the anterior end of the specimen in Figures 1 and 2, showing a close-up of the proboscis.
Adapted from CDC

Macracanthorhynchus hirudinaceous

Eggs of M. hirudinaceous

Eggs of M. hirudinaceous in an unstained wet mount of stool.
Adapted from CDC
Egg of M. hirudinaceous in an unstained wet mount of stool.
Adapted from CDC
Image of the same egg in Figure 2, but in a different plane of focus, showing the textured exterior.
Adapted from CDC

Adults of M. hirudinaceous

Adult of M. hirudinaceous.
Adapted from CDC
Higher magnification of the specimen in Figure 1, showing a close-up of the anterior end and the proboscis containing hooks.
Adapted from CDC
Cross-section of the intestine of a pig, stained with H&E, showing the anterior end of an adult Macracanthorhynchus hirudinaceous embedded within the intestinal wall.
Adapted from CDC

African trypanosomiasis (Sleeping sickness)

Trypansoma brucei

Trypansoma brucei ssp. in thick blood smear stained with Giemsa

Trypansoma brucei ssp. in a thick blood smear stained with Giemsa.
Adapted from CDC
Trypansoma brucei ssp. in a thick blood smear stained with Giemsa.
Adapted from CDC
Trypansoma brucei ssp. in a thick blood smear stained with Giemsa.
Adapted from CDC

Trypansoma brucei ssp. in thin blood smear stained with Giemsa

Trypanosoma brucei ssp. in a thin blood smear stained with Giemsa.
Adapted from CDC
Trypanosoma brucei ssp. in a thin blood smear stained with Giemsa.
Adapted from CDC
Trypanosoma brucei ssp. in a thin blood smear stained with Giemsa.
Adapted from CDC
Trypanosoma brucei ssp. in a thin blood smear stained with Giemsa.
Adapted from CDC

Trypansoma brucei ssp. in thin blood smears stained with Wright-Giemsa

Trypanosoma brucei ssp. in a thin blood smear stained with Wright-Giemsa.
Adapted from CDC
Trypanosoma brucei ssp. in a thin blood smear stained with Wright-Giemsa.
Adapted from CDC
Trypanosoma brucei ssp. in a thin blood smear stained with Wright-Giemsa.
Adapted from CDC
Trypanosoma brucei ssp. in a thin blood smear stained with Wright-Giemsa.
Adapted from CDC
Trypanosoma brucei ssp. in a thin blood smear stained with Wright-Giemsa.
Adapted from CDC
Trypanosoma brucei ssp. in a thin blood smear stained with Wright-Giemsa.
Adapted from CDC

Trypansoma brucei ssp. in thin blood smear, beginning to divide

Trypanosoma brucei ssp. in a thin blood smear stained with Giemsa. The trypomastigote is beginning to divide; dividing forms are seen in African trypanosomes, but not in American trypanosomes.
Adapted from CDC

Amebiasis

Amebiasis cysts

Cyst of E. histolytica/E. dispar stained with trichrome. Note the chromatoid body with blunt ends (red arrow).

Amebiasis trophozioites

Trophozoites of E. histolytic with ingested erythrocytes stained with trichrome. The ingested erythrocytes appear as dark inclusions. The parasite above show nuclei that have the typical small, centrally located karyosome, and thin, uniform peripheral chromatin.
Adapted from CDC
Entamoeba histolytica trophozoites in colon tissue stained with H&E.
Adapted from CDC

American trypanosomiasis (Chagas disease)

Trypanosoma cruzi

Trypanosoma cruzi in thick blood smears stained with Giemsa

Trypanosoma cruzi in thick blood smears stained with Giemsa.
Adapted from CDC

T. cruzi in thin blood smears stained with Giemsa

T. cruzi trypomastigote in a thin blood smear stained with Giemsa. Note the typical C-shape of the trypomastigote that characterizes T. cruzi in fixed blood smears.
Adapted from CDC
T. cruzi trypomastigote in a thin blood smear stained with Giemsa.
Adapted from CDC
T. cruzi trypomastigote in a thin blood smear stained with Giemsa.
Adapted from CDC
Higher magnification of Figure 3, T. cruzi.
Adapted from CDC

T. cruzi in cerebrospinal fluid (CSF) stained with Giemsa

Trypanosoma cruzi trypomastigote in cerebrospinal fluid (CSF) stained with Giemsa.
Adapted from CDC

T. cruzi amastigotes in heart tissue

Trypanosoma cruzi amastigotes in heart tissue. The section is stained with hematoxylin and eosin (H&E).
Adapted from CDC
Trypanosoma cruzi amastigotes in heart tissue. The section is stained with H&E.
Adapted from CDC

T. cruzi epimastigotes, from culture

Trypanosoma cruzi epimastigotes from culture. Note the location of the kinetoplast anterior to the nucleus.
Adapted from CDC

Ancylostomiasis (Hookworm)

Ancylostoma braziliense

Ancylostoma caninum

Anterior end of an adult of Ancylostoma caninum, a dog parasite that has been found to produce a rare human infection known as eosinophilic enteritis.
Adapted from CDC

Ancylostoma ceylanicum

Ancylostoma duodenale

Adult worm of Ancylostoma duodenal. Anterior end is depicted showing cutting teeth.
Adapted from CDC

Necator americanus

Adult worm of Necator americanus. Anterior end showing mouth parts with cutting plates.
Adapted from CDC

Angiostrongyliasis

Angiostrongylus cantonensis

Angiostrongylus cantonensis third stage (L3), infective larva recovered from a slug. Image captured under differential interference contrast (DIC) microscopy.
Adapted from CDC
A. cantonensis (L3), infective larvae recovered from a slug. Image captured under DIC microscopy.
Adapted from CDC
Higher magnification of Image 2. Note the terminal projection on the tip of the tail which is characteristic of A. cantonensis.
Adapted from CDC
Angiostrongylus cantonensis third stage (L3), infective larva, in a wet mount, recovered from a slug. Note the terminal projection on the tip of the tail which is characteristic of A. cantonensis.
Adapted from CDC
A. cantonensis L3, infective larvae, in wet mounts, recovered from slugs.
Adapted from CDC
A. cantonensis L3, infective larvae, in wet mounts, recovered from slugs.
Adapted from CDC

Angiostrongylus costaricensis

A. costaricensis Eggs

Angiostrongylus costaricensis eggs in intestinal tissue stained with hematoxylin and eosin (H&E).
Adapted from CDC
Thin-shelled A. costaricensis eggs in intestinal tissue stained with H&E, a feature consistent with the presence of mature female worms.
Adapted from CDC
A. costaricensis first stage (L1) larva in intestinal tissue stained with H&E
Adapted from CDC

A. costaricensis adult female in tissue sections stained with H&E

Angiostrongylus costaricensis female worm in appendix tissue sections stained with hematoxylin and eosin (H&E). Image courtesy of Regions Hospital, St. Paul, MN.
Adapted from CDC
Higher magnification of the specimen in Figure 1. Notice the thick, multinucleate intestine (IN) and eggs (EG) within the uterus (UT).
Adapted from CDC
Another image from the specimen seen in Figure 1.
Adapted from CDC
Higher magnification of the specimen in Figure 3. Shown here are the thick, multinucleate intestine (IN), reproductive tubes (RT), and lateral chords (LC).
Adapted from CDC

Anisakiasis

Anisakis simplex

Cross-section of Anisakis sp., viewed under DIC microscopy.
Adapted from CDC
Higher magnification of the specimen in Figure 1. Note the tall, prominent muscle cells (MU) and Y-shaped lateral chords (LC), characteristic for this genus.
Adapted from CDC

Pseudoterranova decipiens

Pseudoterranova sp. larval worms

Anterior ends of Pseudoterranova sp. worms; images taken at 40x and 200x magnification, respectively.
Adapted from CDC
Anterior ends of Pseudoterranova sp. worms; images taken at 40x and 200x magnification, respectively.
Adapted from CDC
Anterior end of Pseudoterranova sp. The red arrow indicates the intestinal cecum.
Adapted from CDC
Close-up of the intestinal cecum in the same specimen seen in Figure 3.
Adapted from CDC
Mid-section of a Pseudoterranova sp. worm, showing the esophagus and intestine. Image taken at 40x magnification.
Adapted from CDC
Posterior end of Pseudoterranova sp. Image taken at 200x magnification.
Adapted from CDC

Cross sections of Pseudoterranova sp. worms Cross sections of anisakid worms.

Cross-section of Pseudoterranova sp. Note the large butterfly-shaped lateral chords (black arrows), characteristic for this genus.
Adapted from CDC
Cross-section of Pseudoterranova sp. viewed under differential interference contrast (DIC) microscopy.
Adapted from CDC

Ascariasis

Ascaris lumbricoides

Adult A. lumbricoides

Adult female A. lumbricoides.
Adapted from CDC

Unfertilized egg of A. lumbricoides

Unfertilized egg of A. lumbricoides in an unstained wet mount, 200x magnification.
Adapted from CDC

Fertilized egg of A. lumbricoides

Fertilized egg of A. lumbricoides in unstained wet mounts of stool, with embryos in the early stage of development.
Adapted from CDC

A. lumbricoides in tissue specimen

Eggs of A. lumbricoides in an appendix biopsy, stained with H&E. This image was taken at 200x magnification.
Adapted from CDC

B

Babesiosis

Babesia divergens

Babesia microti

Babesia microti in a thin blood smear stained with Giemsa. Babesia sp. cannot be identified to the species level by morphology alone; additional testing, such as PCR, is always recommended.
Adapted from CDC
Babesia microti in a thin blood smear stained with Giemsa. Babesia sp. cannot be identified to the species level by morphology alone; additional testing, such as PCR, is always recommended. Note the tetrad form in this image.
Adapted from CDC
Babesia microti in a thin blood smear stained with Giemsa. Note the intra-erythrocytic vacuolated forms indicated by the black arrows.
Adapted from CDC

Balantidiasis

Balantidium coli

B. coli cysts

B. coli cysts in a wet mount, unstained.
Adapted from CDC

B. coli trophozoites

B. coli trophozoite in a wet mount, 500× magnification. Note the visible cilia on the cell surface.
Adapted from CDC
Balantidium coli trophozoites in colon tissue stained with hematoxylin and eosin (H&E) at 400x magnification.
Adapted from CDC

Baylisascariasis

Baylisascaris procyonis

Baylisascaris procyonis eggs

Unembryonated egg of B. procyonis.
Adapted from CDC
Embryonated eggs of B. procyonis, showing the developing larva inside.
Adapted from CDC

Baylisascaris procyonis larvae

Larva of B. procyonis hatching from an egg.
Adapted from CDC
Cross-sections of larvae of B. columnaris in muscle of a laboratory-infected mouse. The larval morphology and microscopic manifestations would be similar with B. procyonis in human tissue. Image taken at 400x magnification.
Adapted from CDC

Baylisascaris procyonis larvae

Larva of B. procyonis hatching from an egg.
Adapted from CDC
Cross-sections of larvae of B. columnaris in muscle of a laboratory-infected mouse. The larval morphology and microscopic manifestations would be similar with B. procyonis in human tissue. Image taken at 400x magnification.
Adapted from CDC

Bed Bugs

Cimex hemipterus

Cimex lectularius

Two adults and one nymph (arrow) of C. lectularius, collected in a hotel in urban Georgia.
Adapted from CDC
Close-up of one of the adults in Figure 1.
Adapted from CDC
Higher magnification of the specimen in Figure 2. Note the reduced forewings (arrow).
Adapted from CDC
Ventral view of the specimen in Figure 2.
Adapted from CDC
Higher magnification of the specimen in Figure 4, showing a close-up of the typical hemipteran piercing-sucking mouthparts (arrow).
Adapted from CDC
Nymph of C. lectularius. The blue marks represent 1 mm.
Adapted from CDC

Bertiella infection

Eggs of Bertiella sp. liberated from proglottids. The proglottids were shed from a human patient who had lived for a number of years in Africa. In several of these eggs, the pyriform apparatus can be easily seen. Images courtesy of Clinipath Pathology, Perth, Australia.
Adapted from CDC
An egg of Bertiella sp. liberated from a gravid proglottid. The arrows point to the hooklets.
Adapted from CDC
Proglottids of Bertiella sp.
Adapted from CDC

Bertiella mucronata

Bertiella struderi

Scolex of Bertiella studeri. Image courtesy of Richard Bradbury.
Adapted from CDC

Blastocystis hominis infection

Blastocystis hominis

Blastocystis hominis cyst-like forms in wet mounts

B. hominis cyst-like forms in a wet mount, unstained.
Adapted from CDC
B. hominis cyst-like form in a wet mount, unstained.
Adapted from CDC

B. hominis cyst-like forms in wet mounts under differential interference contrast (DIC) microscopy

B. hominis cyst-like forms in wet mounts under differential interference contrast (DIC) microscopy.
Adapted from CDC
B. hominis cyst-like forms in wet mounts under differential interference contrast (DIC) microscopy.
Adapted from CDC

B. hominis cyst-like forms in wet mounts stained with iodine

B. hominis cyst-like forms in wet mounts stained in iodine.
Adapted from CDC
B. hominis cyst-like forms in wet mounts stained in iodine.
Adapted from CDC

B. hominis cyst-like forms stained with trichrome

B. hominis cyst-like forms stained with trichrome. The nuclei in the peripheral cytoplasmic rim are visible, staining purple.
Adapted from CDC
B. hominis cyst-like forms stained with trichrome. The nuclei in the peripheral cytoplasmic rim are visible, staining purple.
Adapted from CDC
Blastocystis hominis cyst-like forms stained with trichrome.
Adapted from CDC
Blastocystis hominis cyst-like forms stained with trichrome.
Adapted from CDC
B. hominis cyst-like forms stained with trichrome.
Adapted from CDC
B. hominis cyst-like forms undergoing binary fission; stained with trichrome.
Adapted from CDC
B. hominis cyst-like forms stained with trichrome.
Adapted from CDC

C

Cercarial dermatitis (Swimmer’s itch)

Austrobilharzia variglandis

Cercaria of Austrobilharzia variglandis

Cercaria of Austrobilharzia variglandis, which can cause cercarial dermatitis.
Adapted from CDC
Cercaria of Austrobilharzia variglandis, which can cause cercarial dermatitis. Note the forked 'tail' and a pair of 'eye spots' near the anterior end.
Adapted from CDC

Clinical manifestations of Austrobilharzia variglandis

Skin of a patient showing the inflammatory response to cercaria in the skin.
Adapted from CDC

Chilomastix mesnili

Chilomastix mesnili trophozoites, trichrome stain

Trophozoite of C. mesnili from a stool specimen, stained with trichrome. Image taken at 1000x magnification.
Adapted from CDC
Trophozoite of C. mesnili from a stool specimen, stained with trichrome. Image taken at 1000x magnification.
Adapted from CDC
Trophozoite of C. mesnili from a stool specimen, stained with trichrome. Image taken at 1000x magnification.
Adapted from CDC
Trophozoite of C. mesnili from a stool specimen, stained with trichrome. Image taken at 1000x magnification.
Adapted from CDC
Trophozoite of C. mesnili from a stool specimen, stained with trichrome. Image taken at 1000x magnification.
Adapted from CDC
Trophozoite of C. mesnili from a stool specimen, stained with trichrome. Image taken at 1000x magnification.
Adapted from CDC

Chilomastix mesnili cysts, trichrome stain

Cyst of C. mesnili in a stool specimen, stained with trichrome. Image taken at 1000x magnification.
Adapted from CDC
Cyst of C. mesnili in a stool specimen, stained with trichrome. Image taken at 1000x magnification.
Adapted from CDC
Cyst of C. mesnili in a stool specimen, stained with trichrome. Image taken at 1000x magnification.
Adapted from CDC
Cyst of C. mesnili in a stool specimen, stained with trichrome. Image taken at 1000x magnification.
Adapted from CDC
Cyst of C. mesnili in a stool specimen, stained with trichrome. Image taken at 1000x magnification.
Adapted from CDC
Cyst (lower) and trophozoite (upper) of C. mesnili in a stool specimen, stained with trichrome. Image taken at 1000x magnification.
Adapted from CDC

Chilomastix mesnili cysts in wet mounts

Cyst of C. mesnili in a concentrated wet mount of stool, stained with iodine. Image taken at 1000x magnification.
Adapted from CDC
Cyst of C. mesnili in a concentrated wet mount of stool, stained with iodine. Image taken at 1000x magnification.
Adapted from CDC

Clonorchiasis

Clonorchis sinensis

Clonorchis sinensis eggs

C. sinensis egg: the small knob at the abopercular end is visible in this image.
Adapted from CDC
C. sinensis egg. Note the operculum resting on "shoulders;" image taken at 400× magnification.
Adapted from CDC
C. sinensis egg; images taken at 400× magnification.
Adapted from CDC
C. sinensis egg; images taken at 400× magnification.
Adapted from CDC

Clonorchis sinensis adults

Adult of C. sinensis.
Adapted from CDC
Adult of C. sinensis stained with carmine. Clearly visible in this image are the oral sucker (OS), pharynx (PH), ceca (CE), acetabulum, or ventral sucker (AC), uterus (UT), vitellaria (VT) and testes (TE).
Adapted from CDC

Clonorchis sinensis eggs

Shells of Parafossarulus manchouricus, the most common snail host of C. sinensis in endemic areas in southeast Asia. Image courtesy of the Web Atlas of Medical Parasitology and the Korean Society for Parasitology.
Adapted from CDC
Bithynia sp., another common intermediate host of C. sinensis. Image courtesy of Michal Maňas.
Adapted from CDC

Coenurosis

Taenia spp.

Gross coenurus specimens

Large, polycephalic coenurus removed from the shoulder of a baboon (Papio sp.).
Adapted from CDC
Close-up of a coenurus of T. multiceps removed from the eye of a patient, broken open to show multiple protoscoleces.
Adapted from CDC

Coenuri in tissue specimens, stained with hematoxylin and eosin (H&E)

Coenurus removed from a subcutaneous nodule in the shoulder area of a patient, stained with hematoxylin and eosin (H&E). Image taken at 50x magnification. Although the species was not identified in this case, the pathology is consistent with T. serialis.
Adapted from CDC
Higher magnification (200x) of the coenurus in Figure 1.
Adapted from CDC
Higher magnification (200x) of the same specimen shown in Figures 1 and 2. The black arrows point to hooklets in the protoscoleces.
Adapted from CDC
Higher magnification (200x) of the same specimen shown in Figures 1 and 2. The black arrows point to hooklets in the protoscoleces.
Adapted from CDC

Coenurus in an eye specimens, stained with hematoxylin and eosin (H&E)

Cross-section of a human eye, showing multiple protoscoleces within a coenurus.
Adapted from CDC
Higher magnification (200x) of the coenurus in Figure 1.
Adapted from CDC
Higher magnification (200x) of protoscoleces shown in Figures 1 and 2.
Adapted from CDC
Higher magnification (200x) of protoscoleces shown in Figures 1 and 2.
Adapted from CDC
Higher magnification of the protoscolex in Figure 4, showing multiple hooklets.
Adapted from CDC

Cryptosporidiosis

Cryptosporidium spp.

Cryptosporidium sp. oocysts in a wet mount

Cryptosporidium spp. oocysts (pink arrows) in wet mount. A budding yeast (brown arrow) is in the same field.
Adapted from CDC
Cryptosporidium parvumoocysts in wet mount, under differential interference contrast (DIC) microscopy. The oocysts are rounded and measure 4.2 µm - 5.4 µm in diameter. Sporozoites are visible inside the oocysts, indicating that sporulation has occurred.
Adapted from CDC

Cryptosporidium sp. oocysts stained with trichrome

Cryptosporidium sp. oocysts stained with trichrome. Oocysts may be detected, but should not be confirmed by this method. Trichrome staining is inadequate for a definite diagnosis because oocysts will appear unstained. Here the Cryptosporidium oocysts are represented by red arrows; the blue arrow represents yeast.
Adapted from CDC
Cryptosporidium sp. oocyst stained with trichrome. Oocysts may be detected, but should not be confirmed by this method. Trichrome staining is inadequate for a definite diagnosis because oocysts will appear unstained. Here the Cryptosporidium oocyst is represented by a red arrow; the blue arrows represent yeast.
Adapted from CDC

Cryptosporidium sp. oocysts stained with modified acid-fast

Cryptosporidium parvum oocysts stained with modified acid-fast. Against a blue-green background, the oocysts stand out in a bright red stain. Sporozoites are visible inside the two oocysts to the right in this image.
Adapted from CDC
Cryptosporidium parvum oocysts stained with modified acid-fast. Against a blue-green background, the oocysts stand out in a bright red stain.
Adapted from CDC
Cryptosporidium sp. oocysts stained with modified acid-fast.
Adapted from CDC
Cryptosporidium sp. oocyst stained with modified acid-fast.
Adapted from CDC

Cryptosporidium sp. oocysts unstained on a slide stained with modified acid-fast

Cryptosporidium sp. oocysts (red arrows) that did not take up the modified acid-fast stain. The slide was counterstained with methylene blue. Note that yeast cells did stain red (yellow arrows).
Adapted from CDC
Unstained Cryptosporidium sp. oocysts (black arrows) on a slide stained with modified acid-fast. The slide was counterstained with malachite green.
Adapted from CDC

Cryptosporidium sp. oocysts stained with safranin

Cryptosporidium sp. oocysts stained with safranin.
Adapted from CDC
Cryptosporidium sp. oocysts stained with safranin.
Adapted from CDC

Cryptosporidium sp. oocysts stained with Ziehl-Neelsen modified acid-fast

Cryptosporidium sp. oocysts stained with Ziehl-Neelson modified acid-fast. Image contributed by the Oregon State Public Health Laboratory.
Adapted from CDC

Cryptosporidium parvum oocysts stained with the fluorescent stain auramine-rhodamine

Cryptosporidium parvum oocysts stained with the fluorescent stain auramine-rhodamine.
Adapted from CDC

Oocysts of C. parvum' and cysts of Giardia duodenalis labeled with immunofluorescent antibodies

Cryptosporidium sp. oocysts labeled with immunofluorescent antibodies. Images contributed by the Kansas Department of Health and Environment.
Adapted from CDC
Cryptosporidium sp. oocyst labeled with immunofluorescent antibodies. Images contributed by the Kansas Department of Health and Environment.
Adapted from CDC
Cryptosporidium sp. oocysts (yellow arrows) and cysts of Giardia duodenalis (red arrow) labeled with immunofluorescent antibodies.
Adapted from CDC
Cryptosporidium sp. oocysts (yellow arrows) and cysts of Giardia duodenalis (red arrows) labeled with immunofluorescent antibodies.
Adapted from CDC

Cyclosporiasis

Cyclospora cayetanensis

Cyclospora cayetanensis oocysts in wet mounts

Oocyst of C. cayetanensis in an unstained wet mount. Image courtesy of the Oregon State Public Health Laboratory.
Adapted from CDC
Oocyst of C. cayetanensis in an unstained wet mount. Image courtesy of the Oregon State Public Health Laboratory.
Adapted from CDC
Oocyst of C. cayetanensis in an unstained wet mount of stool. Image taken at 1000x magnification.
Adapted from CDC
Oocyst of C. cayetanensis in an unstained wet mount of stool. Image taken at 1000x magnification.
Adapted from CDC

Cyclospora cayetanensis oocysts stained with trichrome

Oocyst of C. cayetanensis stained with trichrome; while the oocyst is visible, the staining characteristics are inadequate for a reliable diagnosis.
Adapted from CDC
Oocysts of C. cayetanensis stained with trichrome; while the oocyst is visible, the staining characteristics are inadequate for a reliable diagnosis.
Adapted from CDC

C. cayetanensis oocysts viewed under ultraviolet (UV) microscopy

Oocyst of C. cayetanensis viewed under UV microscopy.
Adapted from CDC
Oocyst of C. cayetanensis viewed under UV microscopy.
Adapted from CDC
Oocyst of C. cayetanensis viewed under UV microscopy.
Adapted from CDC
Oocyst of C. cayetanensis viewed under UV microscopy.
Adapted from CDC
Oocyst of C. cayetanensis viewed under UV microscopy.
Adapted from CDC
Oocyst of C. cayetanensis viewed under UV microscopy.
Adapted from CDC

C. cayetanensis oocysts stained with modified acid-fast

Oocysts of C. cayetanensis stained with modified acid-fast stain. Note the variability of staining in the four oocysts.
Adapted from CDC
Two oocysts of C. cayetanensis stained with modified acid-fast stain. Both oocysts failed to take up the carbol fuschin stain. Image courtesy of the Arizona State Public Health Laboratory.
Adapted from CDC
Oocysts of C. cayetanensis stained with modified acid-fast stain. Note the wrinkled edge and the lack of stain in the two oocysts. Image courtesy of the Arizona State Public Health Laboratory.
Adapted from CDC
Oocyst of C. cayetanensis stained with modified acid-fast stain.
Adapted from CDC
Oocysts of C. cayetanensis stained with modified acid-fast stain.
Adapted from CDC
Oocysts of C. cayetanensis stained with modified acid-fast stain.
Adapted from CDC

C. cayetanensis oocysts stained with safranin (SAF)

Oocyst of C. cayetanensis stained with safranin (SAF).
Adapted from CDC
Oocyst of C. cayetanensis stained with safranin (SAF).
Adapted from CDC
Oocyst of C. cayetanensis stained with safranin (SAF).
Adapted from CDC
Oocyst of C. cayetanensis stained with safranin (SAF).
Adapted from CDC
A pair of oocysts of C. cayetanensis stained with safranin (SAF).
Adapted from CDC
Oocyst of C. cayetanensis (yellow arrow) along with an oocyst of Cryptosporidium parvum (red arrow), stained with safranin (SAF). Cryptosporidium spp. also stain with the safranin and modified acid-fast stains.
Adapted from CDC

C. cayetanensis oocysts viewed under differential interference contrast (DIC) microscopy

$Oocyst of C. cayetanensis viewed under differential interference contrast (DIC) microscopy. The refractile globules are easily visible under DIC. Adapted from CDC$

Oocyst of C. cayetanensis viewed under differential interference contrast (DIC) microscopy. The refractile globules are easily visible under DIC.
Adapted from CDC
$Oocyst of C. cayetanensis viewed under differential interference contrast (DIC) microscopy. The refractile globules are easily visible under DIC. Adapted from CDC$

Oocyst of C. cayetanensis viewed under differential interference contrast (DIC) microscopy. The refractile globules are easily visible under DIC.
Adapted from CDC
Oocyst of C. cayetanensis viewed under DIC microscopy. There are two sporocysts are visible in this image.
Adapted from CDC
Oocyst of C. cayetanensis viewed under DIC microscopy.
Adapted from CDC
A pair of oocysts of C. cayetanensis viewed under DIC microscopy.
Adapted from CDC
Rupturing oocyst of C. cayetanensis viewed under DIC microscopy. One sporocyst has has been released from the mature oocyst; the second sporocyst is still contained within the oocyst wall.
Adapted from CDC

Cysticercosis

Taenia solium

Larval Taenia solium

Larval Taenia solium cyst in a section of a lesion found in the right frontal lobe of a patient stained with hematoxylin and eosin (H&E), magnification 40×.
Adapted from CDC
An entire cysticercus seen within the bladder walls (blue arrows). A single scolex is visible inside yellow circle) within the cyst.
Adapted from CDC
Higher magnification (100×) of the cyst in Figures 1 and 2. The parenchymatous portion of the cysticercus can be better observed.
Adapted from CDC
The extensive folding of the spiral canal and one sucker of the scolex (black arrow) are apparent. Calcareous corpuscles can be seen in the fibrous tissues (green arrows).
Adapted from CDC
Cross-sections of cysticerci stained with H&E, at 40x magnification
Adapted from CDC
Cross-sections of cysticerci stained with H&E, at 100x magnification.
Adapted from CDC

Cystoisosporiasis (Isosporiasis)

Cystoisospora belli (Isospora belli)

Cystoisospora belli oocysts

Immature oocyst of C. belli in an unstained wet mount, containing a single sporoblast.
Adapted from CDC
Immature oocyst of C. belli stained with safranin, containing a single sporoblast.
Adapted from CDC
Immature oocyst of C. belli stained with acid-fast, showing a single sporoblast.
Adapted from CDC
Oocyst of C. belli viewed under ultraviolet (UV) microscopy, showing two sporoblasts.
Adapted from CDC
Immature oocyst of C. belli in an unstained wet mount showing a single sporoblast.
Adapted from CDC
Immature oocyst of C. belli in an unstained wet mount showing two sporoblasts.
Adapted from CDC
Same oocyst as in Figure 1 but viewed under differential interference contrast (DIC)
Adapted from CDC
Same oocyst as in Figure 2 but viewed under ultraviolet (UV) fluorescent micrscopy.
Adapted from CDC
Same oocyst as in Figures 1 and 3 but viewed under ultraviolet (UV) fluorescent micrscopy.
Adapted from CDC
Same oocyst as in Figures 2 and 4 but viewed under UV microscopy.
Adapted from CDC

Cystoisospora belli oocysts, stained with hematoxylin and eoisin (H&E)

Oocyst of C. belli in the epithelial cells of a mammalian host, stained with H&E (yellow arrow).
Adapted from CDC
Oocyst of C. belli in the epithelial cells of a mammalian host, stained with H&E (yellow arrow).
Adapted from CDC

D

Dicrocoeliasis

Dicrocoelium dendriticum

Dicrocoelium dendriticum eggs in wet mounts

Egg of Dicrocoelium dendriticum in an unstained wet mount of stool. Image courtesy of Dr. Juan Cuadros González.
Adapted from CDC
Egg of Dicrocoelium dendriticum in an unstained wet mount of stool. Image courtesy of Dr. Juan Cuadros González.
Adapted from CDC
Egg of Dicrocoelium dendriticum in an unstained wet mount of stool. Image courtesy of Dr. Juan Cuadros González.
Adapted from CDC
Egg of D. dendriticum in an unstained wet mount of stool.
Adapted from CDC
Egg of D. dendriticum in an unstained wet mount of stool.
Adapted from CDC

Dicrocoelium dendriticum adults

Adult of D. dendriticum, stained with carmine. Structures illustrated in this figure include: oral sucker (OS), acetabulum (AC), uterus (UT), testes (TE), and vitelline glands (VT).
Adapted from CDC

Intermediate hosts of Dicrocoelium dendriticum

Zebrina detrita, a common first intermediate host for D. dendriticum. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC
Formica fusca, a common second intermediate host for D. dendriticum in Europe. Image courtesy of Sedeer El-Showk.
Adapted from CDC

Dientamoeba fragilis infection

Dientamoeba fragilis

Dientamoeba fragilis binucleate trophozoites stained with trichrome

Binucleate form of a trophozoite of D. fragilis, stained with trichrome.
Adapted from CDC
Binucleate form of a trophozoite of D. fragilis, stained with trichrome.
Adapted from CDC
Binucleate form of a trophozoite of D. fragilis, stained with trichrome.
Adapted from CDC
Binucleate form of a trophozoite of D. fragilis, stained with trichrome.
Adapted from CDC
Binucleate form of a trophozoite of D. fragilis, stained with trichrome.
Adapted from CDC
Binucleate form of trophozoites of D. fragilis, stained with trichrome. A cyst-like form of Blastocystis hominis lies to the left of the D. fragilis.
Adapted from CDC

Dientamoeba fragilis uninucleate trophozoites stained with trichrome

Uninucleate form of a trophozoite of D. fragilis, stained with trichrome.
Adapted from CDC
Uninucleate form of a trophozoite of D. fragilis, stained with trichrome.
Adapted from CDC
Uninucleate form of a trophozoite of D. fragilis, stained with trichrome.
Adapted from CDC
Binucleate and uninucleate forms of trophozoites of D. fragilis, stained with trichrome.
Adapted from CDC

Dioctophymiasis

Dioctophyme renale

Larvae of Dioctotphyme renale in human tissue

Cross-sections of larvae of D. renal in a subcutaneous nodule, stained with hematoxylin and eosin (H&E). Images courtesy of the Laboratory of Parasitology, National Public Health Research Center in Vilnius, Lithuania.
Adapted from CDC
Cross-sections of larvae of D. renal in a subcutaneous nodule, stained with hematoxylin and eosin (H&E). Images courtesy of the Laboratory of Parasitology, National Public Health Research Center in Vilnius, Lithuania
Adapted from CDC
Higher-magnification of the specimens shown in Figures 1 and 2, showing a close-up of the characteristic intestine, with cuboidal, uninucleate cells, pigment, and microvilli.
Adapted from CDC
Higher-magnification of the specimens shown in Figures 1 and 2, showing a close-up of the characteristic intestine, with cuboidal, uninucleate cells, pigment, and microvilli.
Adapted from CDC
Higher-magnification of the specimens shown in Figures 1-4. Shown in this image are the tall, polymyarian muscle cells, the characteristic ventral chord with a U-shaped row of nuclei (black arrow), and three pseudocoelomic membranes (red arrows).
Adapted from CDC
Close-up of Figure 1, showing the ventral chord (black-arrow).
Adapted from CDC

Eggs of D. renale in animal tissue

Egg of D. renale in the kidney of a mink, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Egg of D. renale in the kidney of a mink, stained with hematoxylin and eosin (H&E).
Adapted from CDC

Diphyllobothriasis

Diphyllobothrium latum

Diphyllobothrium latum eggs in wet mounts

Eggs of D. latum in an iodine-stained wet mount. Image courtesy of the Oregon State Public Health Laboratory.
Adapted from CDC
Note the knob at the abopercular end. Image courtesy of the Oregon State Public Health Laboratory.
Adapted from CDC
Eggs of D. latum within a proglottid. Image courtesy of the Florida State Public Health Laboratory.
Adapted from CDC
Eggs of D. latum within a proglottid.
Adapted from CDC
Eggs of D. latum in an unstained wet mount.
Adapted from CDC
Eggs of D. latum in an unstained wet mount of stool. Note the opercula are open.
Adapted from CDC

Eggs of Diphyllobothrium latum eggs in wet mounts

Egg of D. latum in an unstained wet-mount of stool.
Adapted from CDC

Proglottids of Diphyllobothrium latum

Section of an adult D. latum containing many proglottids. The scolex was not present in this specimen. Image courtesy of the Florida State Public Health Laboratory.
Adapted from CDC
Close-up of a few of the proglottids from the specimen in Figure 1, showing the rosette-shaped uterus at the center of each proglottid.
Adapted from CDC
Carmine-stained proglottids of D. latum, showing the rosette-shaped ovaries.
Adapted from CDC
Carmine-stained proglottids of D. latum, showing the rosette-shaped ovaries.
Adapted from CDC
Scolex of D. latum.
Adapted from CDC

Dipylidium caninum infection

Dipylidium caninum egg packets in wet mounts

D. caninum egg packet, containing 8 visible eggs, in a wet mount.
Adapted from CDC
D. caninum egg packet in a wet mount.
Adapted from CDC
D. caninum egg packet in wet mount.
Adapted from CDC
D. caninum egg packet in wet mount.
Adapted from CDC
D. caninum egg packet in wet mount.
Adapted from CDC

D. caninum eggs in wet mounts under conventional and differential interference contrast microscopy

D. caninum eggs clumped together in a wet mount. Image taken at 200x magnification.
Adapted from CDC
D. caninum eggs clumped together in a wet mount. Image taken at 400x magnification, hooklets in the some of the eggs are visible.
Adapted from CDC
D. caninum eggs clumped together under differential interference contrast microscopy (same eggs as in Figure 2).
Adapted from CDC
Close up of Figure 3. Note the visible hooklets in three of the eggs.
Adapted from CDC

D. caninum proglottids

D. caninum proglottid under a dissecting microscope cleared with lactophenol.
Adapted from CDC
D. caninum proglottid.
Adapted from CDC
D. caninum proglottid partially cleared with lactophenol, showing eggs and egg packets.
Adapted from CDC
D. caninum proglottid. The genital pores are clearly visible in the carmine-stained proglottid.
Adapted from CDC

Cross-section of a D. caninum proglottid stained with hematoxylin and eosin (H&E)

Cross-section of a D. caninum proglottid stained with H&E. Image taken at 100x magnification.
Adapted from CDC
Cross-section of a D. caninum proglottid stained with H&E. Image taken at 200x magnfication.
Adapted from CDC
Cross-section of a D. caninum proglottid stained with H&E. Image taken at 400x magnification
Adapted from CDC
Cross-section of a D. caninum proglottid stained with H&E. Image taken at 1000x magnification.
Adapted from CDC

D. caninum scolex

D. caninum scolex.
Adapted from CDC

Adult tapeworm of D. caninum

Adult tapeworm of D. caninum. The scolex of the worm is very narrow and the proglottids, as they mature, get larger.
Adapted from CDC

Dirofilariasis

Dirofilaria sp.

Cross-section of Dirofilaria sp. from a subcutaneous nodule, stained with hematoxylin and eosin (H&E). Morphologic features visible in this image include tall, prominent muscle cells (MU), coiled vagina (VG), coiled intestine (IN), lateral chords (LC), and prominent internal lateral ridges (IR). Image courtesy of Drs. Dirk Elston and Paul Bourbeau.
Adapted from CDC
Cross-sections of Dirofilaria spp. from a subcutaneous scalp nodule, stained with H&E. Image courtesy of the Department of Dermatopathology, University of Michigan, Ann Arbor, MI.
Adapted from CDC
Cross-sections of Dirofilaria sp. from a subcutaneous nodule above the right breast of a female patient who traveled to several western European countries, stained with H&E. Image taken at 100x magnification. Image courtesy of Dr. Truus Derks.
Adapted from CDC
Higher magnification of the same specimen as Figure 3, taken at 400x magnification. Note the presence of lateral chords (blue arrows) and internal lateral ridge (black arrow).
Adapted from CDC
Dirofilaria sp. (suspect D. tennis) removed from the eye of a patient.
Adapted from CDC
Close-up of the specimen in Figure 5 showing the cuticular ridging. A uterine tube can also be seen through the cuticle.
Adapted from CDC

Dracunculiasis (Guinea Worm Disease)

Drancunculus medinensis

A female Dracuncunculus medinensis in a human host

The female Guinea worm induces a painful blister.
Adapted from CDC
After rupture of the blister, the worm emerges as a whitish filament in the center of a painful ulcer which is often secondarily infected. (Images contributed by Global 2000/The Carter Center, Atlanta, Georgia).
Adapted from CDC

E

Echinococcosis (Hydatid disease)

Echinococcus granulosus

Echinococcus granulosus in tissue

Protoscoleces in a hydatid cyst removed from lung tissue, stained with hematoxylin and eosin (H&E). Image taken at 200x magnification. Image courtesy of Phoenix Children's Hospital, Phoenix, AZ.
Adapted from CDC
Higher magnification (600x) of the protoscoleces in Figure 1.
Adapted from CDC
Cross-section of an E. granulosus cyst, stained with H&E. The cyst wall is composed of an acellular laminated external layer (green arrow) and a thin, germinal (nucleated) inner layer (yellow arrow). Note the brood capsule (black arrow) with protoscoleces (blue arrows) inside. Image taken at 40x magnification.
Adapted from CDC
Higher magnification (200x) of the cyst in Figure 3, showing daughter cyst (brood capsule). Note the hooklets (purple arrow) inside one of the protoscoleces and the calcareous corpuscles (light blue arrows) along the germinal layer.
Adapted from CDC
Protoscoleces liberated from a hydatid cyst.
Adapted from CDC
Protoscoleces liberated from a hydatid cyst.
Adapted from CDC

Echinococcus granulosus adults

Echinococcus granulosus adult, stained with carmine.
Adapted from CDC
Close-up of the scolex of E. granulosus in Figure 1. In this focal plane, one of the suckers is clearly visible, as is the ring of rostellar hooks.
Adapted from CDC

Echinococcus multilocularis

Echinococcus multilocularis in liver tissue, stained with hematoxylin and eosin (H&E). Magnification at 200x
Adapted from CDC
$Higher magnification (400x) of the specimen in Figure 1. Notice a pair of refractile hooks (yellow arrows). Cestode hooks do not stain with H&E but may be visible with proper adjustment of the microscope. Adapted from CDC$

Higher magnification (400x) of the specimen in Figure 1. Notice a pair of refractile hooks (yellow arrows). Cestode hooks do not stain with H&E but may be visible with proper adjustment of the microscope.
Adapted from CDC
Echinococcus multilocularis in tissue, stained with H&E. Magnification at 200x.
Adapted from CDC
$Higher magnification (400x) of the specimen in Figure 3. Notice the refractile hook (green arrow). Adapted from CDC$

Higher magnification (400x) of the specimen in Figure 3. Notice the refractile hook (green arrow).
Adapted from CDC

Echinococcus oligarthrus

Echinococcus vogeli

Echinostomiasis

Echinostoma spp.

Echinostoma spp. egg in wet mounts

Egg of Echinostoma sp. in an unstained wet mount of stool. Image taken at 400x magnification.
Adapted from CDC

Echinostoma spp. adults

Adult of E. revolutum, stained with carmine. Structures illustrated in this figure include: oral sucker (OS), armed collar (CL), cirrus sac (CS), ventral sucker, or acetabulum (AC), uterus containing eggs (UT), ovary (OV), paired testes (TE), and vitelline glands (VT). This species has been recorded from humans in Taiwan.
Adapted from CDC

Echinostoma sp. in tissue, stained with hematoxylin and eosin (H&E)

Adult Echinostoma removed during a colonoscopy, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Higher magnification of the anterior end of the specimen in Figure 1. Notice the acetabulum (ventral sucker, AC).
Adapted from CDC
Higher magnification of the posterior end of the specimen in Figure 1. Notice the vitelline glands (VT) and lobed testes (TE).
Adapted from CDC
Higher magnification of the specimen in Figures 1-3. Shown here are eggs (EG) within the size range forEchinostoma spp. (roughly 100 micrometers in length, taking into account they are sections and may not be cut in a perfect horizontal plane).
Adapted from CDC

Intermediate hosts of Echinostoma spp.

Lymnaea sp. This snail genus has been recorded as a second intermediate host for E. malayanum. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC
Radix sp. This snail genus has been recorded as a first intermediate host for E. hortense and a second intermediate host for E. cinetorchis. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC
Gyraulus sp. This snail genus has been recorded as an intermediate host for E. cinetorchis. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC
Viviparus sp. This snail genus has been recorded as a second intermediate host for E. cinetorchis and E. hortense. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC
Corbicula sp. This bivalve genus has been recorded as a second intermediate host for E. lindoense. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC

Enterobiasis (Pinworm Infection)

Enterobius vermicularis

Enterobius vermicularis eggs

Eggs of E. vermicularis in a cellulose-tape preparation.
Adapted from CDC
Eggs of E. vermicularis in a wet mount.
Adapted from CDC
Egg of E. vermicularis in an iodine-stained wet mount from a formalin concentrate. Image contributed by the Kansas State Public Health Laboratory.
Adapted from CDC
Egg of E. vermicularis teased from an adult worm recovered from a colonoscopy. Image contributed by the South Carolina Department of Health and Environmental Control, Bureau of Laboratories.
Adapted from CDC
Eggs of E. vermicularis viewed under UV microscopy.
Adapted from CDC
Eggs of E. vermicularis viewed under UV microscopy.
Adapted from CDC

Enterobius vermicularis adult worms

Adult male of E. vermicularis from a formalin-ethyl acetate (FEA) concentrated stool smear. The worm measured 1.4 mm in length. Image contributed by the Centre for Tropical Medicine and Imported Infectious Diseases, Bergen, Norway.
Adapted from CDC
Close-up of the anterior end of the worm in Figure 1. The esophagus, divided into muscular and bulbous portions and separated by a short, narrow isthmus, is visible in the image, as are the cephalic expansions.
Adapted from CDC
Close-up of the posterior end of the worm in Figure 1. Note the blunt end. The spicule is withdrawn into the worm in this specimen.
Adapted from CDC
Anterior end of an adult female of E. vermicularis, recovered from a colonscopy. Image contributed by the South Carolina Department of Health and Environmental Control, Bureau of Laboratories.
Adapted from CDC
Posterior end of the worm in Figure 4. Note the long, slender pointed tail.
Adapted from CDC

Enterobius vermicularis in tissue, stained with hematoxylin and eosin (H&E)

Cross-section of a male E. vermicularis from tissue, stained with H&E. Notice the presence of the alae (blue arrow), intestine (red arrow) and testis (black arrow).
Adapted from CDC
Cross-section of an adult female E. vermicularis from the same specimen shown in Figure 1. Note the presence of the alae (blue arrow), intestine (green arrow) and ovaries (black arrows).
Adapted from CDC
Cross section of an adult female E. vermicularis stained with H&E, recovered during a colonoscopy. Note the prominent alae (blue arrow) and the presence of eggs (yellow arrow). Image contributed by Sheboygan Memorial Hospital, Wisconsin.
Adapted from CDC
Longitudinal section of an adult female E. vermicularis from the same specimen as Figure 3. Note the presence of many eggs.
Adapted from CDC
Egg of E. vermicularis in a colon biopsy specimen, stained with H&E.
Adapted from CDC
Egg of E. vermicularis in a colon biopsy specimen, stained with H&E.
Adapted from CDC

Enteromonas hominis

Enteromonas hominis cysts

Cyst of E. hominis, possessing four nuclei, in a stool specimen stained with iron-hematoxylin.
Adapted from CDC
Cyst of E. hominis, possessing four nuclei, in a stool specimen stained with iron-hematoxylin.
Adapted from CDC

F

Fascioliasis

Fasciola hepatica

Fasciola hepatica eggs

Egg of F. hepatica in an unstained wet mount, taken at 400x magnification.
Adapted from CDC
Egg of F. hepatica in an unstained wet mount, taken at 400x magnification.
Adapted from CDC
Egg of F. hepatica in an unstained wet mount.
Adapted from CDC

F. hepatica adults

Unstained adult of F. hepatica fixed in formalin.
Adapted from CDC
Adult of F. hepatica stained with carmine.
Adapted from CDC

F. hepatica adults observed in endoscopic retrograde cholangiopancreatography (ERCP)

Unstained adult of F. hepatica fixed in formalin.
Adapted from CDC
Adult of F. hepatica stained with carmine.
Adapted from CDC

Intermediate hosts of Fasciola spp.

Galba truncately, the main intermediate host of F. hepatica throughout most of the fluke's natural range in Europe and western Asia. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC
Galba humilis, a host of F. hepatica in Canada and parts of the United States. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC
Fossaria bulamoides, a host for F. hepatica in the western United States. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC
Pseudosuccinea columella, a lymnaeid snail that has been introduced into South America and serves as an intermediate host for F. hepatica in Venezuela and Colombia. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC

Fasciolopsiasis

Fasciolopsis buski

Fasciolopsis buski eggs

Egg of F. buski in a unstained wet mount.
Adapted from CDC
Egg of F. buski in a unstained wet mount.
Adapted from CDC
Egg of F. buski in unstained wet mounts.
Adapted from CDC
Egg of F. buski in an unstained wet mount of stool.
Adapted from CDC
Higher magnification (400x) of the egg in Figure 4. Adapted from CDC

Higher magnification (400x) of the egg in Figure 4.
Adapted from CDC

Fasciolopsis buski adults

Adult fluke of F. buski. Image contributed by Georgia Division of Public Health.
Adapted from CDC
Adult fluke of F. buski.
Adapted from CDC

Intermediate hosts of F. buski

Snail in the genus Hippeutis, an intermediate host for F. buski. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC
Snail in the genus Segmentina, an intermediate host for F. buski. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC

Fleas

Ctenocephalides canis

The dog flea, C. canid. Image courtesy of Parasite and Diseases Image Library, Australia (http://www.padil.gov.au/).
Adapted from CDC

Ctenocephalides felis

The cat flea, C. felis. Image courtesy of Parasite and Diseases Image Library, Australia (http://www.padil.gov.au/).
Adapted from CDC
The cat flea, C. felis. Image courtesy of Parasite and Diseases Image Library, Australia (http://www.padil.gov.au/).
Adapted from CDC

Free-living amebic infections

Acanthamoeba

Acanthamoeba spp. cysts

Cysts of Acanthamoeba spp. in culture.
Adapted from CDC
Cysts of Acanthamoeba spp. in culture.
Adapted from CDC
Cyst of Acanthamoeba sp. from brain tissue, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Cyst of Acanthamoeba sp. from brain tissue, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Cysts of Acanthamoeba sp. (green arrows) in tissue, stained with H&E.
Adapted from CDC

Acanthamoeba spp. trophozoites

Trophozoite of Acanthamoeba sp. from culture. Notice the slender, spine-like acanthapodia.
Adapted from CDC
Trophozoites of Acanthamoeba sp. from culture. Notice the slender, spine-like acanthapodia.
Adapted from CDC
Trophozoite of Acanthamoeba sp. in tissue, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Trophozoites of Acanthamoeba sp. in a corneal scraping, stained with H&E.
Adapted from CDC

Balamuthia mandrillaris

Balamuthia mandrillaris cysts

Cysts of B. mandrillaris.
Adapted from CDC
Close-up of one of the cysts in Figure 1.
Adapted from CDC
Cyst of B. mandrillaris.
Adapted from CDC
Cyst of B. mandrillaris in brain tissue, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Cyst of B. mandrillaris in brain tissue, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Cyst of B. mandrillaris in brain tissue, stained with H&E. Image courtesy of the University of Kentucky Hospital, Lexington, Kentucky.
Adapted from CDC
Cyst of B. mandrillaris in brain tissue, stained with H&E. Image courtesy of the University of Kentucky Hospital, Lexington, Kentucky.
Adapted from CDC
Cysts of B. mandrillaris in brain tissue, stained with H&E. Image courtesy of Cook Children’s Hospital, Fort Worth, Texas.
Adapted from CDC
Cyst of B. mandrillaris in brain tissue, stained with H&E. Image courtesy of Cook Children’s Hospital, Fort Worth, Texas.
Adapted from CDC

Balamuthia mandrillaris trophozoites

Trophozoite of B. mandrillaris in culture.
Adapted from CDC
Trophozoite of B. mandrillaris in culture.
Adapted from CDC
Trophozoite of B. mandrillaris in culture.
Adapted from CDC
Trophozoite of B. mandrillaris in culture.
Adapted from CDC
Several trophozoites of B. mandrillaris in brain tissue, stained with hematoxylin and eosin (H&E).
Adapted from CDC
A single trophozoite (green arrow) of B. mandrillaris in brain tissue, stained with H&E.
Adapted from CDC
A single trophozoite (black arrow) of B. mandrillaris in brain tissue, stained with H&E.
Adapted from CDC

Naegleria fowleri

Naegleria fowleri cysts

Cyst of N. fowleri in culture.
Adapted from CDC

Naegleria fowleri trophozoites

Trophozoite of N. fowleri in culture.
Adapted from CDC
Trophozoites of N. fowleri in culture.
Adapted from CDC
Ameboflagellate trophozoite of N. fowleri.
Adapted from CDC
Trophozoite of N. fowleri in CSF, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Trophozoite of N. fowleri in CSF, stained with trichrome. Image courtesy of the Texas State Health Department.
Adapted from CDC

Sappinia pedata

Four trophozoites (yellow arrows) of S. pedata in brain tissue, stained with hematoxylin and eosin (H&E). In three of the amebae, the two nuclei can easily be seen.
Adapted from CDC

G

Giardiasis

Giardia duodenalis (syn. G. lamblia, G. intestinalis)

Giardia duodenalis cysts in wet mounts stained with iodine

G. duodenalis cyst in a wet mount stained with iodine.
Adapted from CDC
G. duodenalis cyst in a wet mount stained with iodine.
Adapted from CDC
G. duodenalis cyst in a wet mount stained with iodine.
Adapted from CDC
G. duodenalis cyst in a wet mount stained with iodine.
Adapted from CDC
G. duodenalis cyst in a wet mount stained with iodine.
Adapted from CDC
G. duodenalis cyst in a wet mount stained with iodine.
Adapted from CDC

Giardia duodenalis cysts in wet mounts under differential interference contrast (DIC) microscopy

G. duodenalis cyst in a wet mount under differential interference contrast (DIC) microscopy. Image taken at 1000× magnification.
Adapted from CDC
Two G. duodenalis cysts in a wet mount under DIC microscopy; image taken at 1000× magnification.
Adapted from CDC

G. duodenalis cysts in trichrome stain

G. duodenalis cyst stained with trichrome.
Adapted from CDC
G. duodenalis cyst stained with trichrome.
Adapted from CDC
G. duodenalis cyst stained with trichrome.
Adapted from CDC
G. duodenalis cyst stained with trichrome.
Adapted from CDC
G. duodenalis cyst stained with trichrome.
Adapted from CDC
G. duodenalis cyst stained with trichrome.
Adapted from CDC
G. duodenalis cyst stained with trichrome. Sometimes the cytoplasm of the cyst may retract from the cell wall.
Adapted from CDC
G. duodenalis cyst stained with trichrome. Sometimes the cytoplasm of the cyst may retract from the cell wall.
Adapted from CDC
G. duodenalis cyst stained with trichrome. Sometimes the cytoplasm of the cyst may retract from the cell wall.
Adapted from CDC
G. duodenalis cyst stained with trichrome. Sometimes the cytoplasm of the cyst may retract from the cell wall.
Adapted from CDC

G. duodenalis trophozoites in wet mounts

G. duodenalis trophozoite in a wet mount stained with iodine.
Adapted from CDC
G. duodenalis trophozoite in a wet mount under differential interference contrast (DIC) microscopy. Image taken at 1000× magnification.
Adapted from CDC

G. duodenalis trophozoites stained with trichrome

G. duodenalis trophozoite stained with trichrome.
Adapted from CDC
G. duodenalis trophozoite stained with trichrome.
Adapted from CDC
G. duodenalis trophozoite stained with trichrome.
Adapted from CDC
G. duodenalis trophozoites. Image contributed by the Vermont Department of Health Laboratory.
Adapted from CDC

G. duodenalis trophozoites in unique stains

G. duodenalis trophozoites in Kohn stain.
Adapted from CDC
G. duodenalis trophozoites in a Giemsa stained mucosal imprint.
Adapted from CDC

Cysts of Giardia duodenalis and oocysts of Cryptosporidium parvum

Cysts of G. duodenalis (lower right) and oocysts of Cryptosporidium parvum (upper left) labeled with commercially available immunofluorescent antibodies.
Adapted from CDC

Gnathostomiasis

Gnathostoma hispidum

Gnathostoma spinigerum

Head bulb and cuticular spines of Gnathostoma spinigerum

Head bulb.
Adapted from CDC
Cuticular spines of the posterior body part.
Adapted from CDC

Detail of cuticular spines of the anterior body part of G. spinigerum

Detail of cuticular spines of the anterior body part.
Adapted from CDC

Detail of nondendiculated cuticular spines of G. spinigerum

Detail of nondendiculated cuticular spines.
Adapted from CDC
Detail of nondendiculated cuticular spines.
Adapted from CDC

H

Hepatic capillariasis

Capillaria hepatica

Capillaria hepatica eggs

Eggs of C. hepatica in liver stained with hematoxylin and eosin (H&E).
Adapted from CDC
Eggs of C. hepatica in liver stained with hematoxylin and eosin (H&E). The egg in this figure (1000x magnification) shows the typically striated shell and shallow polar prominences.
Adapted from CDC
Eggs of C. hepatica in liver stained with H&E.
Adapted from CDC
Eggs of C. hepatica in liver stained with H&E.
Adapted from CDC

Capillaria hepatica adults

Cross section of a male C. hepatica in liver tissue, stained with hematoxylin and eosin (H&E). Note the presence of the intestine (blue arrow) and the coiled sections of the testes (black arrows).
Adapted from CDC
Cross section of C. hepatica in liver tissue, stained with H&E. Note the presence of the intestine (blue arrow) and bacillary bands (black arrows).
Adapted from CDC
Cross-section of C. hepatica in liver tissue, stained with H&E. Note the presence of a stichocyte (black arrow) and bacillary bands (blue arrows). Image taken at 200x magnification.
Adapted from CDC

Heterophyiasis

Heterophyes heterophyes

Adult of Heterophyes heterophyes

Adult of H. heterophyes, stained with carmine. In this figure, the following structures are labeled: oral sucker (OS), pharynx (PH), intestine (IN), ventral sucker, or acetabulum (AC), and eggs within the uterus (UT)
Adapted from CDC

Snail intermediate hosts of Heterophyes heterophyes

Cerithideopsilla cingulata, an intermediate host for H. heterophyes in southeast Asia. Image courtesy of Conchology, Inc, Mactan Island, Philippines
Adapted from CDC

Hymenolepiasis

Hymenolepis diminuta

Hymenolepis diminuta eggs in wet mounts

Egg of H. diminuta in a wet mount stained with iodine. Four of the hooks are visible at this level of focus. Image courtesy of the Georgia Department of Public Health.
Adapted from CDC
Egg of H. diminuta in a wet mount stained with iodine. Four of the hooks are visible at this level of focus.
Adapted from CDC
Eggs of H. diminuta in an unstained wet mount of concentrated stool. Image taken at 200x magnification.
Adapted from CDC
Higher magnification (400x) of one of the eggs in Figure 3.
Adapted from CDC
Egg of H. diminuta in an unstained wet mount of concentrated stool. Image taken at 400x magnification.
Adapted from CDC
Egg of H. diminuta in an unstained wet mount of concentrated stool. Image taken at 400x magnification.
Adapted from CDC

Hymenolepis diminuta proglottids

Proglottids of H. diminuta stained with carmine. Notice the craspedote form of the proglottids.
Adapted from CDC

Hymenolepis nana

Hymenolepis nana eggs in wet mounts

Egg of H. nana in an unstained wet mount. Note the presence of hooks in the oncosphere and polar filaments within the space between the oncosphere and outer shell.
Adapted from CDC
Egg of H. nana in an unstained wet mount. Note the presence of hooks in the oncosphere and polar filaments within the space between the oncosphere and outer shell.
Adapted from CDC
Egg of H. nana in an unstained wet mount.
Adapted from CDC
Egg of H. nana in an unstained formalin ethyl acetate (FEA) wet mount. In this image, four of the hooks in the oncosphere are clearly visible. Image courtesy of the Oregon State Public Health Laboratory.
Adapted from CDC
Egg of H. nana in an unstained wet mount. In this image, the polar filaments in the space between the oncosphere and outer shell are clearly visible.
Adapted from CDC
Egg of H. nana in an unstained wet mount. In this image, the polar filaments in the space between the oncosphere and outer shell are clearly visible.
Adapted from CDC

Hymenolepis nana eggs, zinc PVA trichrome stain

Egg of H. nana in a trichrome-stained stool specimen. Although trichrome is not the preferred method for observing helminth eggs, they can be detected this way. The eggs are distorted, probably due to the zinc polyvinyl alcohol (PVA) used for preserving specimens for trichrome stain. Images courtesy of the Oregon State Public Health Laboratory.
Adapted from CDC
Egg of H. nana in a trichrome-stained stool specimen. Although trichrome is not the preferred method for observing helminth eggs, they can be detected this way. The eggs are distorted, probably due to the zinc polyvinyl alcohol (PVA) used for preserving specimens for trichrome stain. Images courtesy of the Oregon State Public Health Laboratory.
Adapted from CDC

Hymenolepis nana proglottids

Cross-sections of mature proglottids of H. nana stained with hematoxylin and eosin (H&E), taken at 100x. Note the craspedote (overlapping) proglottids.
Adapted from CDC
Higher magnification of eggs within the proglottid in Figure 1, taken at 400x.
Adapted from CDC
$Higher magnification of the eggs in Figures 1 and 2, taken at 1000x, oil. Hooks do not stain with H&E but are refractile and may be visible in stained specimens with proper adjustment of the microscope. Polar filaments are visible in the egg in the upper right quadrant of the image. Adapted from CDC$

Higher magnification of the eggs in Figures 1 and 2, taken at 1000x, oil. Hooks do not stain with H&E but are refractile and may be visible in stained specimens with proper adjustment of the microscope. Polar filaments are visible in the egg in the upper right quadrant of the image.
Adapted from CDC

Hymenolepis nana adults

Three adult specimens of H. nana. Image courtesy of the Georgia Department of Public Health.
Adapted from CDC
Scolex of H. nana in an unstained wet mount of stool. Image courtesy of Dr. David Bruckner.
Adapted from CDC
Higher magnification of the scolex in Figure 2. In this image, two of the suckers and the rostellar hooks are clearly visible.
Adapted from CDC

I

Intestinal amebae

Entamoeba coli

E. coli cysts in concentrated wet mounts

Cyst of E. coli in a unstained concentrated wet mount. Six nuclei are visible in this focal plane.
Adapted from CDC
Cyst of E. coli in a concentrated wet mount stained with iodine. Five nuclei are visible in this focal plane.
Adapted from CDC
Cyst of E. coli in a concentrated wet mount stained with iodine. Seven nuclei are visible in this focal plane.
Adapted from CDC
Cyst of E. coli in a concentrated wet mount stained with iodine. Five nuclei are visible in this focal plane.
Adapted from CDC
Cyst of E. coli in a concentrated wet mount stained with iodine. Five nuclei are visible in this focal plane.
Adapted from CDC

E. coli cysts stained with trichrome

Immature cyst of E. coli, stained with trichrome. Notice the presence of only two nuclei, and a large glycogen vacuole.
Adapted from CDC
Mature cyst of E. coli, stained with trichrome. Five nuclei are visible in this focal plane.
Adapted from CDC
Mature cyst of E. coli, stained with trichrome. In this specimen, at least five nuclei are visible in the shown focal plane.
Adapted from CDC
Mature cyst of E. coli, stained with trichrome. In this specimen, at least five nuclei are visible in the shown focal plane.
Adapted from CDC
Mature cyst of E. coli, stained with trichrome. This figure and Figure 6 represent the same cyst shown in two different focal planes. Eight nuclei can be seen between the two focal planes. Also, above the cyst in this figure, a trophozoite of Endolimax nana can be seen.
Adapted from CDC
Mature cyst of E. coli, stained with trichrome. This figure and Figure 5 represent the same cyst shown in two different focal planes. Eight nuclei can be seen between the two focal planes.
Adapted from CDC

E. coli trophozoites stained with trichrome

Trophozoite of E. coli stained with trichrome.
Adapted from CDC
Trophozoite of E. coli stained with trichrome.
Adapted from CDC
Trophozoites of E. coli stained with trichrome.
Adapted from CDC
Trophozoite of E. coli stained with trichrome. Adapted from CDC

Trophozoite of E. coli stained with trichrome.
Adapted from CDC

Entamoeba gingivalis

E. gingivalis trophozoites stained with trichrome

Trophozoite of E. gingivalis from culture, stained with trichrome.
Adapted from CDC
Trophozoite of E. gingivalis from culture, stained with trichrome.
Adapted from CDC
Trophozoite of E. gingivalis from culture, stained with trichrome.
Adapted from CDC
Trophozoite of E. gingivalis from culture, stained with trichrome.
Adapted from CDC

Entamoeba hartmanni

E. hartmanni cyst in a wet mount

Cyst of an E. hartmanni in a wet mount, stained with iodine.
Adapted from CDC

E. hartmanni cysts stained with trichrome

Cyst of E. hartmanni stained with trichrome. Notice the bluntly-ended chromatoid bodies.
Adapted from CDC
Cyst of E. hartmanni stained with trichrome.
Adapted from CDC

E. hartmanni trophozoites stained with trichrome

Trophozoite of E. hartmanni stained with trichrome. Image courtesy of the Kansas Department of Health and Environment.
Adapted from CDC
Trophozoite of E. hartmanni stained with trichrome.
Adapted from CDC
Trophozoite of E. hartmanni stained with trichrome. In the upper-right of the image is a cyst-like body of Blastocystis hominis.
Adapted from CDC
Trophozoite of E. hartmanni stained with trichrome.
Adapted from CDC
Two trophozoites of E. hartmanni stained with trichrome. Adapted from CDC

Two trophozoites of E. hartmanni stained with trichrome.
Adapted from CDC
Trophozoite of E. hartmanni stained with trichrome. Adapted from CDC

Trophozoite of E. hartmanni stained with trichrome.
Adapted from CDC

Entamoeba histolytica

Entamoeba polecki

E. polecki cyst in a concentrated wet mount, stained with iodine

Cyst of E. polecki in a wet mount, stained with iodine. Notice the numerous chromatoid bodies (arrows).
Adapted from CDC

E. polecki cysts stained with trichrome

Cyst of E. polecki stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies.
Adapted from CDC
Cyst of E. polecki stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies.
Adapted from CDC
Cyst of E. polecki stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies.
Adapted from CDC
Cyst of E. polecki stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies.
Adapted from CDC
Cyst of E. polecki stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies.
Adapted from CDC
Cyst of E. polecki stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies.
Adapted from CDC

E. polecki trophozoites stained with trichrome

Trophozoite of E. polecki stained with trichrome.
Adapted from CDC
Trophozoite of E. polecki stained with trichrome.
Adapted from CDC
Trophozoite of E. polecki stained with trichrome.
Adapted from CDC
Trophozoite of E. polecki stained with trichrome.
Adapted from CDC
Trophozoite of E. polecki stained with trichrome.
Adapted from CDC

Endolimax nana

Endolimax nana cysts in concentrated wet mounts

Cyst of E. nana in a direct wet mount, viewed under differential interference contrast (DIC) microscopy.
Adapted from CDC
Cyst of E. nana in a direct wet mount stained with iodine.
Adapted from CDC

E. nana cyst stained with trichrome

Cysts of E. nana stained with trichrome.
Adapted from CDC
Cyst of E. nana stained with trichrome.
Adapted from CDC
Cyst of E. nana stained with trichrome.
Adapted from CDC
Cyst of E. nana stained with trichrome.
Adapted from CDC

E. nana trophozoites stained with trichrome

Trophozoite of E. nana stained with trichrome.
Adapted from CDC
Trophozoites of E. nana stained with trichrome.
Adapted from CDC
Trophozoite of E. nana stained with trichrome.
Adapted from CDC
Trophozoite of E. nana stained with trichrome. Image courtesy of the Kansas Department of Health and Environment.
Adapted from CDC
Trophozoite of E. nana stained with trichrome.
Adapted from CDC

Iodamoeba buetschlii

Iodamoeba buetschlii cysts in concentrated wet mounts

$Cyst of I. buetschlii in an unstained concentrated wet mount. In these cysts, the glycogen vacuole can be seen as a large, oval refractile body. Adapted from CDC$

Cyst of I. buetschlii in an unstained concentrated wet mount. In these cysts, the glycogen vacuole can be seen as a large, oval refractile body.
Adapted from CDC
$Cyst of I. buetschlii in an unstained concentrated wet mount. In these cysts, the glycogen vacuole can be seen as a large, oval refractile body. Adapted from CDC$

Cyst of I. buetschlii in an unstained concentrated wet mount. In these cysts, the glycogen vacuole can be seen as a large, oval refractile body.
Adapted from CDC
Cyst of I. buetschlii from the same specimen as seen in Figures A and B, but stained with iodine. In this cyst, the glycogen vacuole is more-easily observed as a dark-staining mass in the cyst.
Adapted from CDC
Cyst of I. buetschlii from the same specimen as seen in Figures A and B, but stained with iodine. In this cyst, the glycogen vacuole is more-easily observed as a dark-staining mass in the cyst.
Adapted from CDC

I. buetschlii cysts stained with trichrome

Cyst of I. buetschlii stained with trichrome. In this specimen, both the nucleus and large glycogen vacuole are visible.
Adapted from CDC
Cyst of I. buetschlii stained with trichrome. In this specimen, both the nucleus and large glycogen vacuole are visible.
Adapted from CDC
Cyst of I. buetschlii stained with trichrome. In this specimen, both the nucleus and large glycogen vacuole are visible (arrow).
Adapted from CDC
Cyst of I. buetschlii stained with trichrome. In this specimen, both the nucleus and large glycogen vacuole are visible.
Adapted from CDC

I. buetschlii trophozoite stained with trichrome

Trophozoite of I. buetschlii trophozoite stained with trichrome.
Adapted from CDC
Trophozoite of I. buetschlii trophozoite stained with trichrome.
Adapted from CDC

Intestinal capillariasis

Capillaria philippinensis

Capillaria philippinensis eggs

Egg of C. philippinensis in an unstained wet mount of stool.
Adapted from CDC
Egg of C. philippinensis in an unstained wet mount of stool.
Adapted from CDC
Egg of C. philippinensis in an unstained wet mount of stool.
Adapted from CDC
Egg of C. philippinensis in an unstained wet mount of stool.
Adapted from CDC

Capillaria philippinensis adults

Longitudinal section of an adult of C. philippinensis from an intestinal biopsy specimen stained with hematoxylin and eosin (H&E).
Adapted from CDC
Longitudinal section of an adult of C. philippinensis from an intestinal biopsy specimen stained with hematoxylin and eosin (H&E).
Adapted from CDC
Longitudinal section of an adult C. philippinensis from an intestinal biopsy specimen, stained with H&E.
Adapted from CDC
Higher magnification of Figure 3, showing stichocytes within the adult worm.
Adapted from CDC
Cross-section of a gravid adult female C. philippinensis from an intestinal biopsy specimen, stained with H&E. Shown in this figure are a bacillary band (blue arrow), the intestine (red arrow) and uterus containing an egg in cross-section (black arrow).
Adapted from CDC

J

K

L

Leishmaniasis (Visceral leishmaniasis, Kala-azar)

Leishmania sp.

Leishmania amastigotes

Leishmania sp. amastigotes in a Giemsa-stained tissue scraping.
Adapted from CDC
Leishmania (Viannia) panamensis amastigotes in a Giemsa-stained tissue scraping. Identification to the species level is not possible based on morphology and other diagnostic techniques such isoenzyme assay or PCR are needed.
Adapted from CDC
Leishmania (Viannia) panamensis amastigotes in a Giemsa-stained tissue scraping.
Adapted from CDC
Leishmania (Viannia) panamensis amastigotes in a Giemsa-stained tissue scraping.
Adapted from CDC
Leishmania sp. amastigotes; touch-prep stained with Giemsa.
Adapted from CDC
Leishmania sp. amastigotes; touch-prep stained with Giemsa.
Adapted from CDC
Leishmania tropica amastigotes from an impression smear of a biopsy specimen from a skin lesion. In this figure, an intact macrophage is practically filled with amastigotes (arrows), several of which have a clearly visible nucleus and kinetoplast.
Adapted from CDC
Leishmania tropica amastigotes from an impression smear of a biopsy specimen from a skin lesion. In this figure, amastigotes are being freed from a rupturing macrophage. Patient had traveled to Egypt, Africa, and the Middle East. Based on culture in NNN medium, followed by isoenzyme analysis, the species was identified as L. tropica.
Adapted from CDC

Leishmania mexicana in tissue stained with hematoxylin and eosin (H&E)

Amastigotes of Leishmania sp. in a biopsy specimen from a skin lesion, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Leishmania mexicana in a biopsy specimen from a skin lesion stained with H&E. The amastigotes are lining the walls of two vacuoles, a typical arrangement. The species identification was derived from culture followed by isoenzyme analysis.
Adapted from CDC

Leishmania sp. promastigotes from culture

Leishmania sp. promastigotes from culture.
Adapted from CDC

Loaiasis

Loa loa

Microfilariae of Loa loa

Microfilaria of L. loa a thick blood smear from a patient from Cameroon, stained with Giemsa. Note the nuclei extending to the tip of the tail to the left of the image.
Adapted from CDC
Microfilaria of L. loa in a thick blood smear, stained with Giemsa.
Adapted from CDC
Microfilaria of L. loa in a thick blood smear, stained with Giemsa.
Adapted from CDC
Microfilaria of L. loa in a thin blood smear, stained with Giemsa.
Adapted from CDC
Microfilaria of L. loa in a thin blood smear, stained with Giemsa.
Adapted from CDC
Microfilaria of L. loa in a thin blood smear, stained with Giemsa.
Adapted from CDC
Microfilariae of L. loa captured by the Knotts concentration technique. Image taken at 100x magnification.
Adapted from CDC
Higher magnification of the microfilariae in Figure 7, taken at 500x oil magnification.
Adapted from CDC

Adults of L. loa

Adult of L. loa removed from the eye of a patient. Image courtesy of the Georgia State Public Health Laboratory.
Adapted from CDC
Adult of L. loa removed from the eye of a patient. Image courtesy of the Georgia State Public Health Laboratory.
Adapted from CDC

Lymphatic filariasis (Bancroftian filariasis)

Brugia malayi

Microfilaria of B. malayi in a thick blood smear, stained with Giemsa.
Adapted from CDC
Microfilaria of B. malayi in a thin blood smear, stained with Giemsa.
Adapted from CDC

Brugia timori

Microfilaria of B. timori in a thick blood smear from a patient from Indonesia, stained with Giemsa and captured at 500x oil magnification. Image from a specimen courtesy of Dr. Thomas C. Orihel, Tulane University, New Orleans, LA.
Adapted from CDC
Microfilaria of B. timori in a thick blood smear from a patient from Indonesia, stained with Giemsa and captured at 500x oil magnification. Image from a specimen courtesy of Dr. Thomas C. Orihel, Tulane University, New Orleans, LA.
Adapted from CDC
Microfilaria of B. timori in a thick blood smear from a patient from Indonesia, stained with Giemsa and captured at 500x oil magnification. Image from a specimen courtesy of Dr. Thomas C. Orihel, Tulane University, New Orleans, LA.
Adapted from CDC
Microfilaria of B. timori in a thick blood smear from a patient from Indonesia, stained with Giemsa and captured at 500x oil magnification. Image from a specimen courtesy of Dr. Thomas C. Orihel, Tulane University, New Orleans, LA.
Adapted from CDC
Microfilaria of B. timori in a thick blood smear from a patient from Indonesia, stained with Giemsa and captured at 500x oil magnification. Image from a specimen courtesy of Dr. Thomas C. Orihel, Tulane University, New Orleans, LA.
Adapted from CDC
Microfilaria of B. timori in a thick blood smear from a patient from Indonesia, stained with Giemsa and captured at 500x oil magnification. Image from a specimen courtesy of Dr. Thomas C. Orihel, Tulane University, New Orleans, LA.
Adapted from CDC

Wuchereria bancrofti

Microfilariae of Wuchereria bancrofti

Microfilaria of W. bancrofti in a thick blood smear stained with Giemsa. Image courtesy of the Oregon State Public Health Laboratory.
Adapted from CDC
Microfilaria of W. bancrofti in a thick blood smear stained with Giemsa. Image courtesy of the Oregon State Public Health Laboratory.
Adapted from CDC
Microfilaria of W. bancrofti in a thick blood smear, stained with Giemsa.
Adapted from CDC
Close-up of the anterior end of the worm in Figure 3.
Adapted from CDC
Close-up of the posterior end of the worm in Figure 3.
Adapted from CDC

Adults of W. bancrofti

Adults of W. bancrofti. The male worm is on the left; the female is on the right.
Adapted from CDC

M

Malaria

Plasmodium falciparum

Plasmodium knowlesi

Plasmodium malariae

Plasmodium ovale

Plasmodium vivax

Mansonellosis

Mansonella ozzardi

Microfilariae of Mansonella ozzardi

Microfilaria of M. ozzardi in a thick blood smear, stained with Giemsa.
Adapted from CDC
Microfilaria of M. ozzardi in a thick blood smear, stained with Giemsa.
Adapted from CDC
Microfilaria of M. ozzardi in a thick blood smears, stained with Giemsa.
Adapted from CDC
Microfilaria of M. ozzardi in a thick blood smear, stained with Giemsa. Note the hook-like end to the tail in this figure.
Adapted from CDC

Mansonella perstans

Microfilariae of Mansonella perstans

Microfilaria of M. perstans in a thick blood smear stained with Giemsa, from a patient from Cameroon.
Adapted from CDC
Microfilaria of M. perstans in a thick blood smear stained with Giemsa, from a patient from Cameroon.
Adapted from CDC
Microfilaria of M. perstans in a thick blood smear stained with Giemsa, from a patient from Cameroon.
Adapted from CDC
Microfilaria of M. perstans in a thin blood smear from the same specimen as Figures 1-3.
Adapted from CDC
Microfilaria of M. perstans in a thin blood smear from the same specimen as Figures 1-4.
Adapted from CDC
Microfilaria of M. perstans in a thick blood smear stained with Giemsa. Image courtesy of the Parasitology Department, Public Health Lab, Ontario Agency for Health Protection and Promotion, Canada.
Adapted from CDC

Mansonella streptocerca

Microfilariae of Mansonella streptocerca

Microfilaria of M. streptocerca, fixed in 2% formalin and stained with hematoxylin.
Adapted from CDC

Mesocestoidiasis

Mesocestoides spp.

Mesocestoides spp. proglottids and scoleces

Proglottids of Mesocestoides sp., collected from the stool of a dog.
Adapted from CDC
Higher magnification of the proglottids in Figure 1, showing the uterus (red arrow), ovary (blue arrow) and parauterine organ (green arrow).
Adapted from CDC
Gravid proglottid of Mesocestoides sp. stained with carmine. Shown in this specimen are the uterus (UT) and excretory ducts (ED).
Adapted from CDC
Mature proglottids of Mesocestoides sp. stained with carmine. Shown in this specimen are the vagina (VA), cirrus sac (CS), bilobed ovary (OV) and numerous testes (TE).
Adapted from CDC
Scolex of Mesocestoides sp. stained with carmine. In this field, two of the suckers are clearly visible. Note that lack of rostellar hooklets.
Adapted from CDC

Mesocestoides spp. tetrathyridia

Tetrathyridium of Mesocestoides sp. in the liver of a laboratory-infected mouse.
Adapted from CDC

Metagonimiasis

Metagonimus yokogawai

Metagonimus yokogawai, adult fluke

Adult M. yokogawai, stained with carmine. In this figure, the following structures are labeled: oral sucker (OS), pharynx (PH), intestine (IN), genitoacetabulum (GA), ovary (OV), the large, paired testes (TE), and eggs within the uterus (EG).
Adapted from CDC

Snail intermediate hosts of M. yokogawai

Snail in the genus, Semisulcospira. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC
Snail in the genus, Semisulcospira. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC

Microsporidiosis

Encephalitozoon cuniculi

Encephalitozoon cuniculi spores stained with Gram Chromotrope.
Adapted from CDC
Encephalitozoon cuniculi spores stained with Gram Chromotrope.
Adapted from CDC
Encephalitozoon cuniculi spores stained with Gram Chromotrope.
Adapted from CDC
Spores of E. cuniculi from urine stained with Ryan's modified trichrome (Trichrome blue).
Adapted from CDC
Spores of E. cuniculi from urine stained with Ryan's modified trichrome (Trichrome blue).
Adapted from CDC
Spores of E. cuniculi from urine stained with Ryan's modified trichrome.
Adapted from CDC
Spores of E. cuniculi in a kidney biopsy specimen stained with Ryan's modified trichrome.
Adapted from CDC

Encephalitozoon hellem

Scanning electron micrograph showing an eukaryotic cell bursting and releasing spores of Encephalitozoon hellem to the extracellular medium.
Adapted from CDC
Monoclonal antibody-based immunofluorescence identification of Encephalitozoon hellem.
Adapted from CDC

Encephalitozoon intestinalis

Electron micrograph of an eukaryotic cell with Encephalitozoon intestinalis spores and developing forms inside a septated parasitophorous vacuole. The vacuole is a characteristic feature of this microsporidian species.
Adapted from CDC
Transmission electron micrograph of E. intestinalis depicting developing forms inside a parasitophorous vacuole (red arrows) with mature spores (black arrows).
Adapted from CDC
Encephalitozoon intestinalis stained with Calcofluor white.
Adapted from CDC

Enterocytozoon bieneusi

Electron micrograph of an Enterocytozoon bieneusi spore. Arrows indicate the double rows of polar tubule coils in cross section which characterize a mature E. bieneusi spore.
Adapted from CDC
Enterocytozoon bieneusi spores stained with Chromotrope 2R.
Adapted from CDC

Nosema spp.

Pleistophora sp.

Trachipleistophora spp.

Vittaforma corneae

Myiasis (Bot Flies)

Cuterebra spp.

Anterior end of a larva of a bot fly in the genus, Cuterebra.
Adapted from CDC
Posterior end of the larva in Figure 1.
Adapted from CDC
Adult of Cuterebra sp. Cuterebra spp. are primarily parasites of rodents and lagomorphs, although human infections are rare. Images taken from specimens courtesy of the Georgia Museum of Natural History, University of Georgia, Athens, GA.
Adapted from CDC
Adult of Cuterebra sp. Cuterebra spp. are primarily parasites of rodents and lagomorphs, although human infections are rare. Images taken from specimens courtesy of the Georgia Museum of Natural History, University of Georgia, Athens, GA.
Adapted from CDC

Dermatobia hominis

Four larvae of D. hominis, removed from a human host.
Adapted from CDC
Close-up of the anterior end of one of the larvae from Figure 1, showing the mandibles.
Adapted from CDC
Close-up of the posterior end of one of the larvae from Figure 1.
Adapted from CDC
Anterior end of a larva of D. hominis. Image from a specimen courtesy of the Idaho State Health Department.
Adapted from CDC
Adult of Dermatobia hominis, the human bot fly. Image taken from a specimen courtesy of the Georgia Museum of Natural History, University of Georgia, Athens, GA.
Adapted from CDC

Oestrus ovis

First instar larva of Oestrus ovis, taken from the conjunctiva of patient in New Zealand. Image courtesy of Auckland City Hospital, Auckland, New Zealand.
Adapted from CDC
Close-up of the anterior end of the larva in Figure 1, showing the cephalopharyngeal skeleton and mandibles.
Adapted from CDC
Close-up of the posterior end of the larva in Figure 1.
Adapted from CDC
First instar larva of O. ovis, collected from the eye of a patient in India presenting with conjunctivitis. Image courtesy of the L V Prasad Eye Institute, Banjara Hills, India.
Adapted from CDC

Phormia regina

Third instar larva of P. regina, collected in the wound of a patient.
Adapted from CDC
Close-up of the posterior spiracles of the specimen in Figure 1.
Adapted from CDC

N

O

Oesophagostomiasis

Oesophagostomum spp.

Eggs of Oesophagostomum spp.

Egg of Oesophagostomum sp. in an unstained wet mount of stool.
Adapted from CDC
Egg of Oesophagostomum sp. in an unstained wet mount of stool.
Adapted from CDC

L3 infective larvae of Oesophagostomum spp.

L3 larva of Oesophagostomum sp., obtained via coproculture from the feces of a baboon (Papio ursinus) in South Africa. Note the long, thin, pointed tail. Image courtesy of the UTC Baboon Research Unit, University of Cape Town, South Africa.
Adapted from CDC
Higher-magnification of the anterior end of the specimen in Figure 1. Note the long cephalic space.
Adapted from CDC
Mid-section of the specimen in Figures 1 and 2. Notice the alternating triangular-shaped intestinal cells (IN).
Adapted from CDC
Tail-end of the specimen in Figures 1-3. Notice the long tail space (arrow) and long, tapering tail sheath.
Adapted from CDC

Adults of Oesophagostomum spp.

Adult of Oesophagostomum sp.
Adapted from CDC
Higher magnification of the anterior end of the specimen in Figure 1. Note the presence of the cephalic vesicle (CV), cephalic groove (CG) and esophagus (ES).
Adapted from CDC
Higher magnification of the anterior end of the specimen in Figures 1 and 2. Note the presence of the cephalic vesicle (CV) and corona radiata (CR).
Adapted from CDC
Posterior end of a female Oesophagostomum sp., showing the pointed tail.
Adapted from CDC
Posterior end of male Oesophagostomum sp. Note the spicule (SP).
Adapted from CDC
Same specimen as in Figure 5, but shown in a slightly different focal plane. Note the bursa (BU).
Adapted from CDC

Oesophagostomum spp. in tissue specimens

Cross-section of an adult of Oesophagostomum sp. in a colon biopsy specimen from a patient from Africa, stained with H&E. Image taken at 40x magnification.
Adapted from CDC
Higher magnification (200x) of the specimen in Figure 1. Note the large, platymyarian muscle cells (MU), intestine with brush border (IN), and paired reproductive tubes (RT).
Adapted from CDC
Higher-magnification (200x) of the specimen in Figure 1. Note the large, platymyarian muscle cells (MU) and thick, muscled esophagus (ES).
Adapted from CDC

Onchocerciasis (River Blindness)

Onchocerca volvulus

Microfilariae of Onchocerca volvulus in tissue

Microfilariae of O. volvulus from a skin nodule of a patient from Zambia, stained with hematoxylin and eosin (H&E). Image taken at 1000x oil magnification. Microfilariae of O. volvulus within the uterus of an adult female. The specimen was taken from the same patient as in Figure 1. Image taken at 500x magnification, oil.
Adapted from CDC
Microfilariae of O. volvulus within the uterus of an adult female. The specimen was taken from the same patient as in Figure A. Image taken at 500x magnification, oil.
Adapted from CDC
Microfilariae of O. volvulus from a skin nodule of a patient from Zambia, stained with H&E. Image taken at 1000x oil magnification.
Adapted from CDC
Coiled microfilaria of O. volvulus, in a skin nodule from a patient from Zambia, stained with H&E. Image taken at 1000x oil magnification.
Adapted from CDC
Cross-section of an adult female O. volvulus, stained with H&E. Note the presence of many microfilariae within the uterus.
Adapted from CDC

Adults of Onchocerca volvulus in tissue

Adult of O. volvulus in a subcutaneous nodule, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Adult of O. volvulus in a subcutaneous nodule, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Adult of O. volvulus in a subcutaneous nodule, stained with H&E.
Adapted from CDC
Adult of O. volvulus in a subcutaneous nodule, stained with H&E.
Adapted from CDC
Cross-section of an adult female Onchocerca sp. from the biopsy of a scalp nodule from a patient from Liberia. Note the presence of the intestine (blue arrow), uterine tubes (red arrows) and some cuticular nodules (green arrows). Also notice the weak musculature under the thick cuticle. Image courtesy of Drs. Philip LeBoit and Paul Borbeau.
Adapted from CDC

Opisthorchiasis

Opisthorchis felineus

Adults of Opisthorchis felineus

Adult of O. felineus. Image courtesy of the Web Atlas of Medical Parasitology and the Korean Society for Parasitology.
Adapted from CDC

Intermediate hosts of Opisthorchis spp.

Bithynia sp., a common intermediate host of Opisthorchis spp. Image courtesy of Michal Maňas.
Adapted from CDC

Opisthorchis viverrini

Eggs of Opisthorchis viverrini in wet mounts

Egg of O. viverrini in an unstained wet mount of concentrated stool. Image taken at 400x magnification.
Adapted from CDC
Egg of O. viverrini in an unstained wet mount of concentrated stool. Image taken at 400x magnification
Adapted from CDC
Egg of O. viverrini in an unstained wet mount of concentrated stool. Image taken at 400x magnification.
Adapted from CDC
Egg of O. viverrini in an unstained wet mount of concentrated stool. Image taken at 400x magnification.
Adapted from CDC

Adults of O. viverrini

Adult of O. viverrini. Image courtesy of the Web Atlas of Medical Parasitology and the Korean Society for Parasitology.
Adapted from CDC

P

Paragonimiasis

Paragonimus spp.

Eggs of Paragonimus spp. in unstained wet mounts

Egg of P. westermani in an unstained wet mount.
Adapted from CDC
Egg of P. westermani in an unstained wet mount.
Adapted from CDC
Eggs of P. westermani in an unstained wet mount.
Adapted from CDC
Egg of P. westermani in an unstained wet mount.
Adapted from CDC

Eggs of Paragonimus spp. in tissue

Eggs of Paragonimus sp. taken from a lung biopsy stained with hematoxylin and eosin (H&E). These eggs measured 80-90 µm by 40-45 µm. The species was not identified in this case.
Adapted from CDC
Egg of Paragonimus sp. taken from a lung biopsy stained with hematoxylin and eosin (H&E). This egg measured 80-90 µm by 40-45 µm. The species was not identified in this case.
Adapted from CDC

Eggs of Paragonimus kellicotti

Cross-section of an egg of P. kellicotti in a lung biopsy specimen, stained with periodic acid-Schiff (PAS) stain. Image courtesy of Dr. Gary Procop.
Adapted from CDC
Longitudinal section of an egg of P. kellicotti in a lung biopsy specimen, stained with hematoxylin and eosin (H&E). Image courtesy of Dr. Gary Procop.
Adapted from CDC
Egg of P. kellicotti in a Pap-stained bronchial alveolar lavage (BAL) specimen at 100x magnification. Image courtesy of Dr. Gary Procop.
Adapted from CDC
Eggs of P. kellicotti in a Pap-stained bronchial alveolar lavage (BAL) specimen at 400x magnification. Image courtesy of Dr. Gary Procop.
Adapted from CDC
Higher magnification (1000x, oil) of the specimen in Figures 3 and 4. Image courtesy of Dr. Gary Procop.
Adapted from CDC

Adults of Paragonimus spp.

Adult of P. westermani.
Adapted from CDC
Higher magnification of the adult fluke seen in Figure 1.
Adapted from CDC
Adult of Paragonimus sp., taken from a lung biopsy specimen stained with hematoxylin and eosin (H&E). Note the presence of the oral sucker. The species was not identified in this case.
Adapted from CDC
Higher magnification of Figure 3, showing a close-up of the cuticle.
Adapted from CDC
Adult of P. kellicotti taken from a lung biopsy specimen stained with H&E. This worm is in poor condition, indicating it was probably an old infection. Image courtesy of Dr. Miguel Madariaga, University of Nebraska Medical Center.
Adapted from CDC
Sections of several adults of P. kellicotti taken from a pleural biopsy stained with H&E. Numbers 1-5 show the individual worms. The integument is gone from most of the worms, as this was probably an old infection, but remnants of the gonad (A, dart) and uterine tubes (B) can be seen. Image courtesy of Dr. Miguel Madariaga, University of Nebraska Medical Center. Image first appeared in: Madariaga, MD, M. G., T. Ruma, MD, and J. H. Theis, MD. 2007. Autochthonous human paragonimiasis in North America. Wilderness & Environmental Medicine. 18(3): 203-205. Image used with permission of © Allen Press Publishing Services.
Adapted from CDC

Pediculosis

Pediculosis sp.

Head and Body Lice adults

Adult of P. humans capitis.
Adapted from CDC
Adult female of P. humans capitis. In this specimen, eggs can be observed in the abdomen.
Adapted from CDC
Adult of P. humanus.
Adapted from CDC

Head and Body Lice nits

Egg ('nit') of P. humanus capitis, with a first-instar nymph starting to hatch out.
Adapted from CDC
Empty shell of the nit in Figure 1, the nymph having left.
Adapted from CDC

Pentatrichomonas hominis

Pentatrichomonas hominis trophozoites

Trophozoite of P. hominis in a stool specimen, stained with trichrome.
Adapted from CDC
Trophozoite of P. hominis in a stool specimen, stained with trichrome.
Adapted from CDC
Trophozoite of P. hominis in a stool specimen, stained with trichrome.
Adapted from CDC
Two trophozoites of P. hominis in a stool specimen, stained with trichrome.
Adapted from CDC
Trophozoites of P. hominis in a stool specimen, stained with trichrome.
Adapted from CDC
Trophozoite of P. hominis in a stool specimen, stained with iron hematoxylin.
Adapted from CDC

Philophthalmiasis

Philophthalmus spp.

Philophthalmus spp, adult flukes

Adult Philophthalmus sp., removed from the conjunctiva of a patient, stained with hematoxylin and eosin (H&E). In this figure, the following structures are labeled: oral sucker (OS), acetabulum (AC), and of the large, paired testes (TE). The positioning of the specimen during preparation did not allow for demonstration of the large pharynx.
Adapted from CDC
Close up of the anterior end of the worm is Figure 1.
Adapted from CDC
Adult Philophthalmus sp., removed from the conjunctiva of an artificially-infected chicken, stained with H&E. Illustrated in this figure is one of the large, paired testes (TE).
Adapted from CDC
Close-up of the anterior end of the worm in Figure 3, showing a close-up of the oral sucker (OS), pharynx (PH), and acetabulum (AC).
Adapted from CDC

Snail intermediate hosts of Philophthalmus spp.

Melanoides tuberculata, an intermediate host for Philophthalmus spp. in the Middle East.
Adapted from CDC
Thiara sp., an intermediate host for Philophalmus gralli in southeast Asia and Hawaii. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC
Semisulcospira spp., intermediate hosts for Philophthalmus spp. Images courtesy of Conchology, Inc, Mactan Island, Philippines.
Adapted from CDC
Snails thyridium of Mesocestoides sp. in the liver of a laboratory-infected mouse.
Adapted from CDC

Pneumocystis pneumonia (PCP)

Pneumocystis jirovecii (previously Pneumocystis carinii)

Pneumocystis jirovecii trophozoites

Trophozoites of P. jirovecii in a bronchoalveolar lavage (BAL) specimen from an AIDS patient, stained with Giemsa.
Adapted from CDC

Pneumocystis jirovecii cysts

Cysts of P. jirovecii in lung tissue, stained with methenamine silver and hematoxylin and eosin (H&E). The walls of the cysts are stained black; the intracystic bodies are not visible with this stain.
Adapted from CDC
Cysts of P. jirovecii in lung tissue, stained with methenamine silver and hematoxylin and eosin (H&E). The walls of the cysts are stained black; the intracystic bodies are not visible with this stain.
Adapted from CDC

Indirect immunofluorescence using monoclonal antibodies against Pneumocystis jirovecii

Indirect immunofluorescence using monoclonal antibodies against Pneumocystis jirovecii.
Adapted from CDC
Direct immunofluorescence antibody stain using monoclonal antibodies that target Pneumocystis jirovecii. This image is from a bronchoalveolar lavage (BAL) specimen from a patient with a malignancy. Image courtesy of Brigham & Women's Hospital, Boston, MA.
Adapted from CDC

Q

R

Retortamonas intestinalis

Retortamonas intestinalis, trophozoites

Trophozoite of R. intestinalis in a stool specimen, stained with trichrome.
Adapted from CDC
Trophozoite of R. intestinalis in a stool specimen, stained with trichrome.
Adapted from CDC

Retortamonas intestinalis, cysts

Cyst of R. intestinalis in a stool specimen, stained with trichrome.
Adapted from CDC
Cyst of R. intestinalis in a stool specimen, stained with trichrome.
Adapted from CDC
Cyst of R. intestinalis in a stool specimen, stained with trichrome.
Adapted from CDC
Cyst of R. intestinalis in a stool specimen, stained with trichrome.
Adapted from CDC

S

Sarcocystosis

Sarcocystis hominis

Sarcocystis suihominis

Sarcocystis spp.

Sarcocystis oocysts in wet mounts

Sporulated oocyst of Sarcocystis sp. in an unstained wet mount, magnification 400x.
Adapted from CDC
Individual sporocyst of Sarcocystis sp. in an unstained wet mount, magnification 400x.
Adapted from CDC
Sporulated oocyst of Sarcocystis sp. in unstained wet mounts, magnification 400x.
Adapted from CDC
Sporulated oocyst of Sarcocystis sp. in unstained wet mounts, magnification 400x.
Adapted from CDC

Sarcocystis oocysts in wet mounts viewed under differential interference contrast (DIC)

Sporulated oocyst of Sarcocystis sp. in a wet mount viewed under differential interference contrast (DIC) microscopy, magnification 400x.
Adapted from CDC
Individual sporocyst of Sarcocystis sp. in a wet mount viewed under DIC microscopy, magnification 400x.
Adapted from CDC
Sporulated oocyst of Sarcocystis sp. in a wet mount viewed under DIC microscopy, magnification 400x.
Adapted from CDC

Sarcocystis oocysts in wet mounts viewed under ultraviolet (UV) microscopy

Sporulated oocyst of Sarcocystis sp. in a wet mount viewed under UV microscopy, magnification 400x.
Adapted from CDC
Sporulated oocyst of Sarcocystis sp. in a wet mount viewed under UV microscopy, magnification 400x.
Adapted from CDC
Individual sporocyst of Sarcocystis sp. in a wet mount viewed under UV microscopy, magnification 400x.
Adapted from CDC

Sarcocystis sarcocysts in tissue

Sarcocysts of Sarcocystis sp. in muscle tissue, stained with hematoxylin and eosin (H&E). Notice the bradyzoites within each sarcocyst. Images courtesy of the William Beaumont Hospital, Royal Oak, MI.
Adapted from CDC
Sarcocysts of Sarcocystis sp. in muscle tissue, stained with hematoxylin and eosin (H&E). Notice the bradyzoites within each sarcocyst. Images courtesy of the William Beaumont Hospital, Royal Oak, MI.
Adapted from CDC
Sarcocysts of Sarcocystis sp. in muscle tissue, stained with H&E. Image courtesy of the William Beaumont Hospital, Royal Oak, MI.
Adapted from CDC
Higher magnification of one of the sarcocysts in Figure 3, showing many bradyzoites.
Adapted from CDC
Sarcocyst of Sarcocystis sp. in muscle tissue, stained with H&E (magnification 500x).
Adapted from CDC
Higher magnification (1000x) of the sarcocyst in Figure 5, showing many bradyzoites.
Adapted from CDC

Schistosomiasis (Bilharziasis)

Schistosoma haematobium

Egg of S. haematobium in a wet mount of urine concentrates, showing the characteristic terminal spine.
Adapted from CDC
Egg of S. haematobium in a wet mount of urine concentrates, showing the characteristic terminal spine.
Adapted from CDC
Egg of S. haematobium in a wet mount of a urine concentrate.
Adapted from CDC

Schistosoma intercalatum

Egg of S. intercalatum in a wet mount.
Adapted from CDC
Egg of S. intercalatum in a wet mount.
Adapted from CDC

Schistosoma japonicum

Egg of S. japonicum in an unstained wet mount. Note the small, inconspicuous spines (red arrows).
Adapted from CDC
Egg of S. japonicum in an unstained wet mount. Note the small, inconspicuous spines (red arrows).
Adapted from CDC
Egg of S. japonicum in an unstained wet mount of stool. The spine is not visible in either of these specimens.
Adapted from CDC
Egg of S. japonicum in an unstained wet mount of stool. The spine is not visible in either of these specimens.
Adapted from CDC
Egg of S. japonicum in an unstained wet mount of stool.
Adapted from CDC
Egg of S. japonicum in an unstained wet mount of stool.
Adapted from CDC

Schistosoma mansoni

Egg of S. mansoni in an unstained wet mount. Images courtesy of the Wisconsin State Laboratory of Hygiene.
Adapted from CDC
Egg of S. mansoni in an unstained wet mount. Images courtesy of the Wisconsin State Laboratory of Hygiene.
Adapted from CDC
Egg of S. mansoni in an unstained wet mount. Images courtesy of the Missouri State Public Health Laboratory.
Adapted from CDC
Egg of S. mansoni in an unstained wet mount. Images courtesy of the Missouri State Public Health Laboratory.
Adapted from CDC
Eggs of S. mansoni in an unstained wet mount.
Adapted from CDC
Egg of S. mansoni in an unstained wet mount.
Adapted from CDC
Adults of S. mansoni. The thin female resides in the gynecophoral canal of the thicker male.
Adapted from CDC
Adults of S. mansoni. The thin female resides in the gynecophoral canal of the thicker male. Note the tuberculate exterior of the male.
Adapted from CDC

Schistosoma mekongi

Egg of S. mekongi. Note the inconspicuous spine (red arrow).
Adapted from CDC

Sparganosis

Proliferating spargana in groin tissue

Proliferating sparganum in groin tissue of a patient from Paraguay, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Proliferating spargana in groin tissue of a patient from Paraguay, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Proliferating sparganum in groin tissue of a patient from Paraguay, stained with hematoxylin and eosin (H&E).
Adapted from CDC

Proliferating spargana in lung tissue

Proliferating sparganum in lung tissue in a patient from Taiwan, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Higher magnification of the sparganum in Figure 1. In this image, calcareous corpuscles (green arrows) can be seen.
Adapted from CDC
Proliferating sparganum in lung tissue in a patient from Taiwan, stained with H&E.
Adapted from CDC
Higher magnification of the sparganum in Figure 3. In this image, calcareous corpuscles (green arrows) can be seen.
Adapted from CDC

Spargana removed from tissue

Sparganum removed from the chest wall of a patient. The worm measured about 70 mm long. Images from a specimen courtesy of the Oklahoma State Department of Health.
Adapted from CDC
Sparganum removed from the chest wall of a patient. The worm measured about 70 mm long. Images from a specimen courtesy of the Oklahoma State Department of Health.
Adapted from CDC
Close-up of the anterior end of the sparganum in Figures 1 and 2. Note the end is thickened and wrinkled, and possesses a characteristic cleft-like invagination.
Adapted from CDC
Sparganum removed from the ocular conjunctiva of a patient from Taiwan. The worm measured 40 mm long. Image courtesy of Dr. John H. Cross and the Uniformed Services University of the Health Sciences, Bethesda, MD.
Adapted from CDC

Sparganum proliferum

Spirometra erinacei

Spirometra mansoni

Spirometra mansonoides

Spirometra ranarum

Strongyloidiasis

Strongyloides stercoralis

Strongyloides stercoralis first-stage rhabditiform (L1) larvae

Rhabditiform larva of S. stercoralis in unstained wet mounts of stool. Notice the short buccal canal and the genital primordium (red arrows).
Adapted from CDC
Rhabditiform larva of S. stercoralis in unstained wet mounts of stool. Notice the short buccal canal and the genital primordium (red arrows).
Adapted from CDC
Close-up of the anterior end of a rhabditiform larva of S. stercoralis, showing the short buccal canal (red arrow) and the rhabditoid esophagus (blue arrow). Image taken at 1000x oil magnification.
Adapted from CDC
Rhabditiform larva of S. stercoralis in an unstained wet mount of stool. Notice the short buccal canal and the genital primordium (red arrow).
Adapted from CDC
Rhabditiform larva of S. stercoralis in an unstained wet mount of stool. Notice the rhabditoid esophagus (blue arrow) and prominent genital primordium (red arrow).
Adapted from CDC
Rhabditiform larva of S. stercoralis in an unstained wet mount of stool. Notice the prominent genital primordium (blue arrow), rhabditoid esophagus (red arrow) and short buccal canal (green arrow).
Adapted from CDC

Strongyloides stercoralis third-stage filariform (L3) larvae

Filariform (L3) larva of S. stercoralis in an unstained wet mount.
Adapted from CDC
Filariform (L3) larva of S. stercoralis in a sputum specimen, stained with Giemsa. Image taken at 200x magnification.
Adapted from CDC
Higher magnification (1000x oil) of the worm in Figure 2. Notice the notched tail.
Adapted from CDC

Strongyloides stercoralis free-living adults

Free-living adult male S. stercoralis. Notice the presence of the spicule (red arrow).
Adapted from CDC
Free living adult male S. stercoralis, showing a spicule (red arrow). A smaller, rhabditiform larva lies adjacent to the adult male.
Adapted from CDC
Adult free-living female S. stercoralis alongside a smaller rhabditiform larva. Notice the developing eggs in the adult female.
Adapted from CDC
Adult free-living female S. stercoralis. Notice the row of eggs within the female’s body.
Adapted from CDC

Strongyloides stercoralis in tissue

Cross-sections of female S. stercoralis (blue arrows) in small intestine tissue, stained with H&E. Image taken at 200x magnification.
Adapted from CDC
Sections of S. stercoralis from a duodenal biopsy specimen, stained with H&E. Although strongyloidiasis could not be confirmed based on microscopy alone, this case was confirmed using molecular methods (PCR). Image taken at 200x magnification.
Adapted from CDC
Higher magnification (1000x oil) of a female of S. stercoralis from the same specimen as Figure 1. Notice the intestine (red arrow) and ovaries (blue arrows).
Adapted from CDC
Higher magnification (1000x oil) of a gravid female of S. stercoralis from the same specimen as Figure 1. Notice the intestine (blue arrow), ovary (red arrow) and an egg within the uterus (green arrow).
Adapted from CDC
Cross-sections of larvae of S. stercoralis in a intestinal biopsy specimen, stained with H&E. Image taken at 1000x oil magnification. The patient was infected with Strongyloides following transplant of an infected kidney.
Adapted from CDC
Longitudinal-section of a larva of S. stercoralis from the same specimen as Figure 5. Image taken at 400x magnification.
Adapted from CDC

T

Taeniasis

Taenia spp.

Taenia spp. eggs

Taenia sp. eggs in unstained wet mounts.
Adapted from CDC
Taenia sp. egg in unstained wet mounts.
Adapted from CDC
Iodine-stained wet mount of a Taenia sp. egg. Image courtesy of the Oregon State Public Health Laboratory.
Adapted from CDC
Iodine-stained wet mount of a Taenia sp. egg. Image courtesy of the Oregon State Public Health Laboratory.
Adapted from CDC
Unstained Taenia sp. egg, teased from a proglottid of an adult. Four hooks can easily be seen in this image.
Adapted from CDC

Taenia spp. scoleces

Scolex of T. solium. Note the four large suckers and rostellum containing two rows of hooks.
Adapted from CDC
Scolex of T. solium. Note the four large suckers and rostellum containing two rows of hooks.
Adapted from CDC
Scolex of T. saginata. Note the four large suckers and lack of rostellum and rostellar hooks.
Adapted from CDC

Taenia spp. proglottids

Mature proglottid of T. saginata, stained with carmine. Note the number of primary uterine branches (>12).
Adapted from CDC
Mature proglottid of T. saginata, stained with India ink. Note the number of primary uterine branches (>12). Image courtesy of the Orange County Public Health Laboratory, Santa Ana, CA.
Adapted from CDC
Mature proglottid of T. solium, stained with carmine. Note the number of primary uterine branches (<13).
Adapted from CDC
Mature proglottid of T. solium, stained with India ink. Note the number of primary uterine branches (<13) in the lower specimen.
Adapted from CDC
Proglottid of T. saginata unstained. Image courtesy of the Oregon State Public Health Laboratory.
Adapted from CDC
The same proglottid as in Figure 5 injected with India ink, demonstrating the number of primary uterine branches (>12). Image courtesy of the Oregon State Public Health Laboratory.
Adapted from CDC

Cross-sections of Taenia spp. stained with hematoxylin and eosin (H&E)

Cross-section of a proglottid of Taenia sp., stained with H&E. Note the thick outer tegument and the loose parenchyma filling the body. Calcareous corpuscles (red arrows), characteristic of the cestodes, can be seen in the parenchyma. Image courtesy of the Washington State Public Health Laboratories. Adapted from CDC

Cross-section of a proglottid of Taenia sp., stained with H&E. Note the thick outer tegument and the loose parenchyma filling the body. Calcareous corpuscles (red arrows), characteristic of the cestodes, can be seen in the parenchyma. Image courtesy of the Washington State Public Health Laboratories.
Adapted from CDC
Cross-section of a proglottid of Taenia sp., stained with H&E. Note the thick outer tegument and the loose parenchyma filling the body. Calcareous corpuscles (red arrows), characteristic of the cestodes, can be seen in the parenchyma. Eggs (blue arrows) can also be seen. Image courtesy of the Washington State Public Health Laboratories.
Adapted from CDC
$Higher magnification of the image in Figure 2, showing a close-up of the eggs. Note the characteristic striations, typical for the taeniids. Not visible in these images are the hooks commonly seen in cestode eggs. Hooks do not stain with H&E but are refractile and are visible with fine focusing of the microscope Adapted from CDC$

Higher magnification of the image in Figure 2, showing a close-up of the eggs. Note the characteristic striations, typical for the taeniids. Not visible in these images are the hooks commonly seen in cestode eggs. Hooks do not stain with H&E but are refractile and are visible with fine focusing of the microscope
Adapted from CDC
$Higher magnification of the image in Figure 2, showing a close-up of the eggs. Note the characteristic striations, typical for the taeniids. Not visible in these images are the hooks commonly seen in cestode eggs. Hooks do not stain with H&E but are refractile and are visible with fine focusing of the microscope. Adapted from CDC$

Higher magnification of the image in Figure 2, showing a close-up of the eggs. Note the characteristic striations, typical for the taeniids. Not visible in these images are the hooks commonly seen in cestode eggs. Hooks do not stain with H&E but are refractile and are visible with fine focusing of the microscope.
Adapted from CDC
Close-up of a cross-section of a Taenia sp. proglottid stained with H&E, showing numerous calcareous corpuscles (yellow arrows). Image courtesy of the Michael E. DeBakey V. A. Medical Center in Houston, TX. Adapted from CDC

Close-up of a cross-section of a Taenia sp. proglottid stained with H&E, showing numerous calcareous corpuscles (yellow arrows). Image courtesy of the Michael E. DeBakey V. A. Medical Center in Houston, TX.
Adapted from CDC
Close-up of a cross-section of a Taenia sp. proglottid stained with H&E, showing numerous calcareous corpuscles. Image courtesy of Ameripath. Adapted from CDC

Close-up of a cross-section of a Taenia sp. proglottid stained with H&E, showing numerous calcareous corpuscles. Image courtesy of Ameripath.
Adapted from CDC

Taenia spp. adults

Taenia saginata adult worm. The adult in this image is approximately 4 meters in length. Adapted from CDC

Taenia saginata adult worm. The adult in this image is approximately 4 meters in length.
Adapted from CDC
Taenia saginata adult worm. Adapted from CDC

Taenia saginata adult worm.
Adapted from CDC

Thelaziasis

Thelazia spp.

Thelazia spp. adults

Anterior end of a female Thelazia sp. Note the lack of lips (arrow) and prominent striations.
Adapted from CDC
Mid-section of a female Thelazia sp. Note the prominent striations.
Adapted from CDC
Mid-section of a gravid female Thelazia sp., showing many typical spirurid-type eggs.
Adapted from CDC
Posterior end of a female Thelazia sp.
Adapted from CDC

Intermediate hosts of Thelazia spp.

Fannia canicularis, the lesser house fly. This species has been implicated in the transmission of thelaziasis in the United States and Asia. Image courtesy of Parasite and Diseases Image Library, Australia.
Adapted from CDC
Musca domestica, the house fly. This species has been implicated in the transmission of thelaziasis in the United States and Asia. Image courtesy of Parasite and Diseases Image Library, Australia.
Adapted from CDC

Toxocariasis

Toxocara canis

Toxocara canis larva hatching

Toxocara canis larva beginning to hatch.
Adapted from CDC
T. canis larva hatching.
Adapted from CDC
T. canis larva.
Adapted from CDC

Toxocara cati

Adult Toxocara cati worms

Close-up of the anterior end of Toxocara cati, showing the three lips characteristic of ascarid worms.
Adapted from CDC
Side view of Figure 1, showing the broad, arrow-shaped alae with striations, characteristic of T. cati.
Adapted from CDC
Close-up of the posterior end of T. cati, showing a prominent point at the end of the “tail.”.
Adapted from CDC

Toxoplasmosis

Toxoplasma gondii

Trichinellosis (Trichinosis)

Trichinella spp.

Encysted larvae of Trichinella in tissue, stained with hematoxylin and eosin (H&E)

Encysted larvae of Trichinella sp. in muscle tissue, stained with hematoxylin and eosin (H&E). The image magnification is 200x. Adapted from CDC

Encysted larvae of Trichinella sp. in muscle tissue, stained with hematoxylin and eosin (H&E). The image magnification is 200x.
Adapted from CDC
Encysted larvae of Trichinella sp. in muscle tissue, stained with hematoxylin and eosin (H&E). The image magnification is 400x.
Adapted from CDC
Encysted larvae of Trichinella sp. in muscle tissue, stained with hematoxylin and eosin (H&E). Image was captured at 400x magnification.
Adapted from CDC
Encysted larvae of Trichinella sp. in muscle tissue, stained with hematoxylin and eosin (H&E). Image was were captured at 400x magnification.
Adapted from CDC
Higher-magnification of the larvae in Figure 3. Shown in these cuts are a nucleated stichocyte (ST), prominent lateral chords, or bacillary bands, (LC), immature reproductive tubes (RT), and the intestine (IN). Image captured at 1000x magnification.
Adapted from CDC

Trichinella larvae in tongue tissue of a rat, stained with H&E

Trichinella larva in tongue muscle of a rat, stained with hematoxylin and eosin (H&E). Image was captured at 400x magnification.
Adapted from CDC
Trichinella larva in tongue muscle of a rat, stained with hematoxylin and eosin (H&E). Image was captured at 400x magnification.
Adapted from CDC

Larvae of Trichinella from bear meat

Trichinella larvae in pressed bear meat, partially digested with pepsin.
Adapted from CDC
Trichinella larva in pressed bear meat, partially digested with pepsin.
Adapted from CDC
Trichinella larvae in pressed bear meat, partially digested with pepsin.
Adapted from CDC
Trichinella larvae in pressed bear meat, partially digested with pepsin.
Adapted from CDC
Larva of Trichinella liberated from bear meat. This larva is from a different case than those shown in Figures 1-4.
Adapted from CDC
Larva of Trichinella liberated from bear meat. This larva is from a different case than those shown in Figures 1-4.
Adapted from CDC

Trichostrongylosis

Trichostrongylus spp.

Trichostrongylus spp. eggs in wet mounts

Egg of Trichostrongylus sp. in an unstained wet mount of stool.
Adapted from CDC
Egg of Trichostrongylus sp. in an unstained wet mount of stool.
Adapted from CDC
Egg of Trichostrongylus sp. in an unstained wet mount of stool. Image courtesy of the Indiana State Department of Health.
Adapted from CDC
Egg of Trichostrongylus sp. in an unstained wet mount of stool. Image courtesy of the Indiana State Department of Health.
Adapted from CDC

Trichostrongyle eggs in wet mounts

Egg of a trichostrongyle in an unstained wet mount of stool from a patient from Afghanistan. Eggs ranged in size from 87-92 µm in length by 50-55 µm in width. Images courtesy of the Leiden University Medical Center, The Netherlands.
Adapted from CDC
Egg of a trichostrongyle in an unstained wet mount of stool from a patient from Afghanistan. Eggs ranged in size from 87-92 µm in length by 50-55 µm in width. Images courtesy of the Leiden University Medical Center, The Netherlands.
Adapted from CDC
Egg of a trichostrongyle from the same specimen as Figures 1 and 2. In this egg, a developing larva can be observed.
Adapted from CDC

Trichostrongylus adults

Anterior end of a female Trichostrongylus sp. Image of a glycerin-mounted specimen, taken at 200x magnification.
Adapted from CDC
Posterior end of the same specimen as Figure 1. Note the pointed tail. Image taken at 200x magnification.
Adapted from CDC
Midsection of the same specimen from Figures 1 and 2. Note a row of eggs in the uterus.
Adapted from CDC
Posterior end of a male Trichostrongylus sp. Note the presence of a bursa (red arrow) and spicule (blue arrow). of a glycerin-mounted specimen, taken at 200x magnification.
Adapted from CDC

Trichuriasis (Whip Worm)

Trichuris trichiura

Tungiasis

Tunga penetrans

Tunga penetrans

Tunga penetrans removed from a lesion on the bottom of the foot of a patient who traveled to Africa. The bulk of the lesion and the posterior part of the flea are marked with a blue arrow. The anterior end of the flea, showing the head, mouthparts and forelegs, is marked with a green arrow. Note the lack of pronotal and genal combs. A single egg (yellow arrow), is also shown.
Adapted from CDC
Eggs of T. penetrans liberated from the lesion on the second toe of a patient who traveled to Guyana. Image courtesy of Spectrum Health, Grand Rapids, MI.
Adapted from CDC
Close-up of the eggs from the specimen in Figure 2.
Adapted from CDC

Tunga penetrans lesions and biopsy specimens

Gross lesion on a patient's foot caused by T. penetrans. Image courtesy of Drs. Mohammed Asmal and Rocio M. Hurtado. Image first appeared at Partners' Infectious Disease Images (http://www.idimages.org), whose content is copyrighted by Partners Healthcare System, Inc., and is used with permission.
Adapted from CDC
Gross lesion on a patient's foot caused by T. penetrans. Image courtesy of Drs. Mohammed Asmal and Rocio M. Hurtado. Image first appeared at Partners' Infectious Disease Images (http://www.idimages.org), whose content is copyrighted by Partners Healthcare System, Inc., and is used with permission.
Adapted from CDC
Cross-sections of T. penetrans in tissue, stained with hematoxylin and eosin (H&E).
Adapted from CDC
Cross-sections of T. penetrans in tissue, stained with hematoxylin and eosin (H&E). In this image, the following structures are labeled: cuticle (CU), gut (GU), and developing eggs (EG).
Adapted from CDC

U

V

W

X

Y

Z

@@ Line 130: / Line 130: @@
 ====Human papillomavirus====
-<gallery widths=200px>
-ImageName.jpg | Description [http://phil.cdc.gov/Phil/ <font size="-2">''Adapted from CDC''</font>]
-</gallery>
 ====Lymphogranuloma venereum====
-<gallery widths=200px>
-ImageName.jpg | Description [http://phil.cdc.gov/Phil/ <font size="-2">''Adapted from CDC''</font>]
-</gallery>
 ====Pubic lice infestation====
 <gallery widths=200px>
@@ Line 159: / Line 147: @@
 PHIL_4078_lores.jpg | This patient presented with an infestation of ''Phthirus pubis'', or crab lice. A Phthirus pubis infestation has caused the erythematous lesions seen in the pubic region of this patient in response to the bites of the crab lice arthropods. [http://phil.cdc.gov/Phil/ <font size="-2">''Adapted from CDC''</font>]
 _lores.jpg | This image depicts a dorsal view of a female head louse, ''Pediculus humanus var. capitis''. Lice are parasitic insects that can be found on people's heads, and bodies, including the pubic area. Human lice survive by feeding on human blood. Lice found on each area of the body are different from each other. The three types of lice that live on humans are: ''Pediculus humanus var. capitis'' (head louse), ''Pediculus humanus var. corporis'' (body louse, clothes louse) and ''Pthirus pubis'' ("crab" louse, pubic louse). Only the body louse is known to spread disease. Lice infestations (pediculosis and pthiriasis) are spread most commonly by close person-to-person contact. Dogs, cats, and other pets do not play a role in the transmission of human lice. Lice move by crawling; they cannot hop or fly. Both over-the-counter and prescription medications are available for treatment of lice infestations. [http://phil.cdc.gov/Phil/ <font size="-2">''Adapted from CDC''</font>]
@@ Line 226: / Line 213: @@
 </gallery>
 '''Adults of ''M. moniliformis'''''
@@ Line 248: / Line 234: @@
 </gallery>
 '''Adults of ''M. hirudinaceous'''''
@@ Line 256: / Line 241: @@
 M_hirudinaceous_anterior_BAM1.jpg | Higher magnification of the specimen in Figure 1, showing a close-up of the anterior end and the proboscis containing hooks. <br> [http://www.cdc.gov/dpdx/acanthocephaliasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 M_hirudinaceous_tissue1.jpg | Cross-section of the intestine of a pig, stained with H&E, showing the anterior end of an adult ''Macracanthorhynchus hirudinaceous'' embedded within the intestinal wall. <br> [http://www.cdc.gov/dpdx/acanthocephaliasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 300: / Line 284: @@
 =====Amebiasis=====
 '''Amebiasis cysts'''
 <gallery widths=200px>
@@ Line 328: / Line 311: @@
 '''''T. cruzi'' in thin blood smears stained with Giemsa'''''
 <gallery widths=200px>
@@ Line 339: / Line 321: @@
 '''''T. cruzi'' in cerebrospinal fluid (CSF) stained with Giemsa'''''
 <gallery widths=200px>
@@ Line 347: / Line 328: @@
 '''''T. cruzi'' amastigotes in heart tissue'''''
 <gallery widths=200px>
@@ Line 356: / Line 336: @@
 '''''T. cruzi'' epimastigotes, from culture'''''
 <gallery widths=200px>
@@ Line 364: / Line 343: @@
 =====Ancylostomiasis (Hookworm)=====
 ======''Ancylostoma braziliense''======
 ======''Ancylostoma caninum''======
 <gallery widths=200px>
 A_caninum_head.jpg | Anterior end of an adult of ''Ancylostoma caninum'', a dog parasite that has been found to produce a rare human infection known as eosinophilic enteritis. <br> [http://www.cdc.gov/dpdx/hookworm/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 ======''Ancylostoma ceylanicum''======
 ======''Ancylostoma duodenale''======
 <gallery widths=200px>
@@ Line 392: / Line 367: @@
 =====Angiostrongyliasis=====
 ======''Angiostrongylus cantonensis''======
 <gallery widths=200px>
@@ Line 405: / Line 379: @@
 ======''Angiostrongylus costaricensis''======
 '''''A. costaricensis'' Eggs'''
@@ Line 416: / Line 389: @@
 </gallery>
-'''''A. costaricensis'' adult female in tissue sections stained with H&E'''<gallery widths=200px>
+'''''A. costaricensis'' adult female in tissue sections stained with H&E'''
+<gallery widths=200px>
 A_costaricensis_MN_A.jpg | ''Angiostrongylus costaricensis'' female worm in appendix tissue sections stained with hematoxylin and eosin (H&E). Image courtesy of Regions Hospital, St. Paul, MN. <br> [http://www.cdc.gov/dpdx/angiostrongyliasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 427: / Line 401: @@
 =====Anisakiasis=====
 ======''Anisakis simplex''======
@@ Line 438: / Line 411: @@
 ======''Pseudoterranova decipiens''======
 '''''Pseudoterranova'' sp. larval worms'''
@@ Line 453: / Line 425: @@
 '''Cross sections of ''Pseudoterranova'' sp. worms''' Cross sections of anisakid worms.
 <gallery widths=200px>
@@ Line 522: / Line 493: @@
 =====Baylisascariasis=====
 ======''Baylisascaris procyonis''======
 '''''Baylisascaris procyonis'' eggs'''
 <gallery widths=200px>
@@ Line 535: / Line 503: @@
 '''''Baylisascaris procyonis'' larvae'''
 <gallery widths=200px>
@@ Line 544: / Line 511: @@
 '''''Baylisascaris procyonis'' larvae'''
 <gallery widths=200px>
@@ Line 555: / Line 521: @@
 ======''Cimex hemipterus''======
 ======''Cimex lectularius''======
 <gallery widths=200px>
@@ Line 713: / Line 678: @@
 Coenurus_HB_20x_B.jpg | Higher magnification (200x) of the same specimen shown in Figures 1 and 2. The black arrows point to hooklets in the protoscoleces. <br> [http://www.cdc.gov/dpdx/coenurosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Coenurus_HB_20x_C.jpg | Higher magnification (200x) of the same specimen shown in Figures 1 and 2. The black arrows point to hooklets in the protoscoleces. <br> [http://www.cdc.gov/dpdx/coenurosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 '''Coenurus in an eye specimens, stained with hematoxylin and eosin (H&E)'''
 <gallery widths=200px>
@@ Line 812: / Line 775: @@
 '''''Cyclospora cayetanensis'' oocysts stained with trichrome'''
+<gallery widths=200px>
-<gallery widths=200px>
 Cyclospora_trichrome_HB1.jpg | Oocyst of ''C. cayetanensis'' stained with trichrome; while the oocyst is visible, the staining characteristics are inadequate for a reliable diagnosis. <br> [http://www.cdc.gov/dpdx/cyclosporiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Cyclospora_trichrome_HB2.jpg | Oocysts of ''C. cayetanensis'' stained with trichrome; while the oocyst is visible, the staining characteristics are inadequate for a reliable diagnosis. <br> [http://www.cdc.gov/dpdx/cyclosporiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 820: / Line 783: @@
 '''''C. cayetanensis'' oocysts viewed under ultraviolet (UV) microscopy'''
+<gallery widths=200px>
-<gallery widths=200px>
 Cyclospora_UV_Henry1.jpg | Oocyst of ''C. cayetanensis'' viewed under UV microscopy. <br> [http://www.cdc.gov/dpdx/cyclosporiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Cyclospora_UV_Henry2.jpg | Oocyst of ''C. cayetanensis'' viewed under UV microscopy. <br> [http://www.cdc.gov/dpdx/cyclosporiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 827: / Line 791: @@
 Cyclospora_UV_Mike2.jpg | Oocyst of ''C. cayetanensis'' viewed under UV microscopy. <br> [http://www.cdc.gov/dpdx/cyclosporiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Cyclospora_UV_Mike3.jpg | Oocyst of ''C. cayetanensis'' viewed under UV microscopy. <br> [http://www.cdc.gov/dpdx/cyclosporiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Cyclospora_UV_Mike4.jpg | Oocyst of ''C. cayetanensis'' viewed under UV microscopy. <br> [http://www.cdc.gov/dpdx/cyclosporiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 833: / Line 796: @@
 '''''C. cayetanensis'' oocysts stained with modified acid-fast'''
 <gallery widths=200px>
 Cyclospora_AF_Henry1.jpg | Oocysts of ''C. cayetanensis'' stained with modified acid-fast stain. Note the variability of staining in the four oocysts. <br> [http://www.cdc.gov/dpdx/cyclosporiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 841: / Line 802: @@
 Cyclospora_AF_AZ2.jpg | Oocysts of ''C. cayetanensis'' stained with modified acid-fast stain. Note the wrinkled edge and the lack of stain in the two oocysts. Image courtesy of the Arizona State Public Health Laboratory. <br> [http://www.cdc.gov/dpdx/cyclosporiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Cyclospora_AF_Henry2.jpg | Oocyst of ''C. cayetanensis'' stained with modified acid-fast stain. <br> [http://www.cdc.gov/dpdx/cyclosporiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Cyclospora_AF_Henry3.jpg | Oocysts of ''C. cayetanensis'' stained with modified acid-fast stain. <br> [http://www.cdc.gov/dpdx/cyclosporiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Cyclospora_AF_Henry4.jpg | Oocysts of ''C. cayetanensis'' stained with modified acid-fast stain. <br> [http://www.cdc.gov/dpdx/cyclosporiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 848: / Line 808: @@
 '''''C. cayetanensis'' oocysts stained with safranin (SAF)'''
 <gallery widths=200px>
@@ Line 861: / Line 820: @@
 '''''C. cayetanensis'' oocysts viewed under differential interference contrast (DIC) microscopy'''
 <gallery widths=200px>
 Cyclospora_DIC_Mike1.jpg | Oocyst of ''C. cayetanensis'' viewed under differential interference contrast (DIC) microscopy. The refractile globules are easily visible under DIC. <br> [http://www.cdc.gov/dpdx/cyclosporiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 877: / Line 834: @@
 ======''Taenia solium''======
 '''Larval ''Taenia solium'''''
 <gallery widths=200px>
@@ Line 886: / Line 842: @@
 Cysticercus1_40x.jpg | Cross-sections of cysticerci stained with H&E, at 40x magnification <br> [http://www.cdc.gov/dpdx/cysticercosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Cysticercus1_100x.jpg | Cross-sections of cysticerci stained with H&E, at 100x magnification. <br> [http://www.cdc.gov/dpdx/cysticercosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 938: / Line 893: @@
 '''Intermediate hosts of ''Dicrocoelium dendriticum'''''
 <gallery widths=200px>
@@ Line 986: / Line 940: @@
 '''Eggs of ''D. renale'' in animal tissue'''
 <gallery widths=200px>
 D_renale_egg_tissue1.jpg | Egg of ''D. renale'' in the kidney of a mink, stained with hematoxylin and eosin (H&E). <br> [http://www.cdc.gov/dpdx/dioctophymiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 D_renale_egg_tissue3.jpg | Egg of ''D. renale'' in the kidney of a mink, stained with hematoxylin and eosin (H&E). <br> [http://www.cdc.gov/dpdx/dioctophymiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 1,031: / Line 981: @@
 =====''Dipylidium caninum'' infection=====
 '''''Dipylidium caninum'' egg packets in wet mounts'''
 <gallery widths=200px>
@@ Line 1,140: / Line 1,089: @@
 </gallery>
 ======''Echinococcus multilocularis''======
 <gallery widths=200px>
@@ Line 1,149: / Line 1,099: @@
 </gallery>
 ======''Echinococcus oligarthrus''======
 ======''Echinococcus vogeli''======
@@ Line 1,163: / Line 1,114: @@
 '''''Echinostoma'' spp. adults'''
 <gallery widths=200px>
 E_revolutum_adult.jpg | Adult of ''E. revolutum'', stained with carmine. Structures illustrated in this figure include: oral sucker (OS), armed collar (CL), cirrus sac (CS), ventral sucker, or acetabulum (AC), uterus containing eggs (UT), ovary (OV), paired testes (TE), and vitelline glands (VT). This species has been recorded from humans in Taiwan. <br> [http://www.cdc.gov/dpdx/echinostomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 '''''Echinostoma'' sp. in tissue, stained with hematoxylin and eosin (H&E)'''
 <gallery widths=200px>
@@ Line 1,179: / Line 1,127: @@
 Echinostoma_tissue_BAM3.jpg | Higher magnification of the posterior end of the specimen in Figure 1. Notice the vitelline glands (VT) and lobed testes (TE). <br> [http://www.cdc.gov/dpdx/echinostomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Echinostoma_tissue_BAM4.jpg | Higher magnification of the specimen in Figures 1-3. Shown here are eggs (EG) within the size range forEchinostoma spp. (roughly 100 micrometers in length, taking into account they are sections and may not be cut in a perfect horizontal plane). <br> [http://www.cdc.gov/dpdx/echinostomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 1,188: / Line 1,137: @@
 Gyraulus_Conchology_A.jpg | ''Gyraulus'' sp. This snail genus has been recorded as an intermediate host for ''E. cinetorchis''. Image courtesy of Conchology, Inc, Mactan Island, Philippines. <br> [http://www.cdc.gov/dpdx/echinostomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Viviparus_Conchology_A.jpg | ''Viviparus'' sp. This snail genus has been recorded as a second intermediate host for ''E. cinetorchis'' and ''E. hortense''. Image courtesy of Conchology, Inc, Mactan Island, Philippines. <br> [http://www.cdc.gov/dpdx/echinostomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Corbicula_Conchology_B.jpg | ''Corbicula'' sp. This bivalve genus has been recorded as a second intermediate host for ''E. lindoense''. Image courtesy of Conchology, Inc, Mactan Island, Philippines. <br> [http://www.cdc.gov/dpdx/echinostomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 1,198: / Line 1,144: @@
 ======''Enterobius vermicularis''======
 '''''Enterobius vermicularis'' eggs'''
 <gallery widths=200px>
@@ Line 1,212: / Line 1,157: @@
 '''''Enterobius vermicularis'' adult worms'''
 <gallery widths=200px>
 Evermicularis_adult2_Norway.jpg | Adult male of ''E. vermicularis'' from a formalin-ethyl acetate (FEA) concentrated stool smear. The worm measured 1.4 mm in length. Image contributed by the Centre for Tropical Medicine and Imported Infectious Diseases, Bergen, Norway. <br> [http://www.cdc.gov/dpdx/enterobiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 1,223: / Line 1,167: @@
 '''''Enterobius vermicularis'' in tissue, stained with hematoxylin and eosin (H&E)'''
 <gallery widths=200px>
@@ Line 1,241: / Line 1,184: @@
 E_hominis_cyst_BAM2.jpg | Cyst of ''E. hominis'', possessing four nuclei, in a stool specimen stained with iron-hematoxylin. <br> [http://www.cdc.gov/dpdx/enteromonas/gallery.html <font size="-2">''Adapted from CDC''</font>]
 E_hominis_cyst_BAM3.jpg | Cyst of ''E. hominis'', possessing four nuclei, in a stool specimen stained with iron-hematoxylin. <br> [http://www.cdc.gov/dpdx/enteromonas/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 ====F====
 =====Fascioliasis=====
 ======''Fasciola hepatica''======
 '''''Fasciola hepatica'' eggs'''
 <gallery widths=200px>
@@ Line 1,260: / Line 1,200: @@
 '''''F. hepatica'' adults'''
 <gallery widths=200px>
@@ Line 1,269: / Line 1,208: @@
 '''''F. hepatica'' adults observed in endoscopic retrograde cholangiopancreatography (ERCP)'''
 <gallery widths=200px>
@@ Line 1,285: / Line 1,223: @@
 Fossaria_bulimoides_Poppe.jpg | ''Fossaria bulamoides'', a host for ''F. hepatica'' in the western United States. Image courtesy of Conchology, Inc, Mactan Island, Philippines. <br> [http://www.cdc.gov/dpdx/fascioliasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Pseudosuccinea_columella_Poppe.jpg | ''Pseudosuccinea columella'', a lymnaeid snail that has been introduced into South America and serves as an intermediate host for ''F. hepatica'' in Venezuela and Colombia. Image courtesy of Conchology, Inc, Mactan Island, Philippines. <br> [http://www.cdc.gov/dpdx/fascioliasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 1,290: / Line 1,229: @@
 ======''Fasciolopsis buski''======
 '''''Fasciolopsis buski'' eggs'''
 <gallery widths=200px>
@@ Line 1,298: / Line 1,236: @@
 F_buski_wtmt200_HB1.jpg | Egg of ''F. buski'' in an unstained wet mount of stool. <br> [http://www.cdc.gov/dpdx/fasciolopsiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 F_buski_wtmt200_HB2.jpg | Higher magnification (400x) of the egg in Figure 4. <br> [http://www.cdc.gov/dpdx/fasciolopsiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 '''''Fasciolopsis buski'' adults'''
 <gallery widths=200px>
@@ Line 1,310: / Line 1,246: @@
 </gallery>
 '''Intermediate hosts of ''F. buski'''''
 <gallery widths=200px>
@@ Line 1,326: / Line 1,260: @@
 C_canis_PADIL.jpg |  The dog flea, ''C. canid''. Image courtesy of Parasite and Diseases Image Library, Australia (http://www.padil.gov.au/). <br> [http://www.cdc.gov/dpdx/fleas/gallery.html/ <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 ======''Ctenocephalides felis''======
 <gallery widths=200px>
 C_felis_PADIL1.jpg | The cat flea, ''C. felis''. Image courtesy of Parasite and Diseases Image Library, Australia (http://www.padil.gov.au/). <br> [http://www.cdc.gov/dpdx/fleas/gallery.html/ <font size="-2">''Adapted from CDC''</font>]
@@ Line 1,395: / Line 1,329: @@
 N_fowleri_cyst_Vish1.jpg | Cyst of ''N. fowleri'' in culture. <br> [http://www.cdc.gov/dpdx/freeLivingAmebic/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 1,422: / Line 1,355: @@
 '''''Giardia duodenalis'' cysts in wet mounts stained with iodine'''
 <gallery widths=200px>
 Giardia_cyst_wtmt.jpg | ''G. duodenalis'' cyst in a wet mount stained with iodine. <br> [http://www.cdc.gov/dpdx/giardiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 1,430: / Line 1,362: @@
 Giardia_cyst_wtmt5.jpg | ''G. duodenalis'' cyst in a wet mount stained with iodine. <br> [http://www.cdc.gov/dpdx/giardiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Giardia_cyst_wtmt6.jpg | ''G. duodenalis'' cyst in a wet mount stained with iodine. <br> [http://www.cdc.gov/dpdx/giardiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 '''''Giardia duodenalis'' cysts in wet mounts under differential interference contrast (DIC) microscopy'''
 <gallery widths=200px>
 Giardia_cyst_dic.jpg | ''G. duodenalis'' cyst in a wet mount under differential interference contrast (DIC) microscopy. Image taken at 1000× magnification. <br> [http://www.cdc.gov/dpdx/giardiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Giardia_cyst_dic2.jpg | Two ''G. duodenalis'' cysts in a wet mount under DIC microscopy; image taken at 1000× magnification. <br> [http://www.cdc.gov/dpdx/giardiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 1,457: / Line 1,386: @@
 Giardia_cyst_tric10.jpg | ''G. duodenalis'' cyst stained with trichrome. Sometimes the cytoplasm of the cyst may retract from the cell wall. <br> [http://www.cdc.gov/dpdx/giardiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
+</gallery>
-</gallery>
 '''''G. duodenalis'' trophozoites in wet mounts'''
 <gallery widths=200px>
 Giardia_troph_wtmt.jpg | ''G. duodenalis'' trophozoite in a wet mount stained with iodine. <br> [http://www.cdc.gov/dpdx/giardiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 1,467: / Line 1,395: @@
 </gallery>
 '''''G. duodenalis'' trophozoites stained with trichrome'''
 <gallery widths=200px>
 Giardia_troph_tric.jpg | ''G. duodenalis'' trophozoite stained with trichrome. <br> [http://www.cdc.gov/dpdx/giardiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 1,476: / Line 1,404: @@
 Giardia_troph_VT.jpg | ''G. duodenalis'' trophozoites. Image contributed by the Vermont Department of Health Laboratory. <br> [http://www.cdc.gov/dpdx/giardiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
+</gallery>
-</gallery>
 '''''G. duodenalis'' trophozoites in unique stains'''
 <gallery widths=200px>
 Giardia_troph_kohn.jpg | ''G. duodenalis'' trophozoites in Kohn stain. <br> [http://www.cdc.gov/dpdx/giardiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 1,486: / Line 1,413: @@
 </gallery>
 '''Cysts of ''Giardia duodenalis'' and oocysts of ''Cryptosporidium parvum'''''
 <gallery widths=200px>
 Giardia_cyst_IFA.jpg | Cysts of ''G. duodenalis'' (lower right) and oocysts of ''Cryptosporidium parvum'' (upper left) labeled with commercially available immunofluorescent antibodies. <br> [http://www.cdc.gov/dpdx/giardiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 1,503: / Line 1,429: @@
 Gnathostoma1.jpg | Head bulb. <br> [http://www.cdc.gov/dpdx/gnathostomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Gnathostoma2.jpg | Cuticular spines of the posterior body part. <br> [http://www.cdc.gov/dpdx/gnathostomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 '''Detail of cuticular spines of the anterior body part of ''G. spinigerum'''''
@@ Line 1,514: / Line 1,438: @@
 </gallery>
 '''Detail of nondendiculated cuticular spines  of ''G. spinigerum'''''
@@ Line 1,527: / Line 1,450: @@
 ===== Hepatic capillariasis=====
 ======''Capillaria hepatica''======
 '''''Capillaria hepatica'' eggs'''
 <gallery widths=200px>
@@ Line 1,550: / Line 1,472: @@
 ======''Heterophyes heterophyes''======
 '''Adult of ''Heterophyes heterophyes'''''
 <gallery widths=200px>
 H_heterophyes_adult_BAM3.jpg | Adult of ''H. heterophyes'', stained with carmine. In this figure, the following structures are labeled: oral sucker (OS), pharynx (PH), intestine (IN), ventral sucker, or acetabulum (AC), and eggs within the uterus (UT) <br> [http://www.cdc.gov/dpdx/heterophyiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 1,597: / Line 1,517: @@
 </gallery>
 '''''Hymenolepis nana'' eggs, zinc PVA trichrome stain'''
 <gallery widths=200px>
@@ Line 1,604: / Line 1,525: @@
 </gallery>
 '''''Hymenolepis nana'' proglottids'''
 <gallery widths=200px>
@@ Line 1,612: / Line 1,534: @@
 </gallery>
 '''''Hymenolepis nana'' adults'''
 <gallery widths=200px>
@@ Line 1,698: / Line 1,621: @@
 ======''Entamoeba polecki''======
 '''''E. polecki'' cyst in a concentrated wet mount, stained with iodine'''
 <gallery widths=200px>
@@ Line 1,710: / Line 1,632: @@
 Epolecki_cyst_tric.jpg | Cyst of ''E. polecki'' stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies. <br> [http://www.cdc.gov/dpdx/intestinalAmebae/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Epolecki_cyst_tric2.jpg | Cyst of ''E. polecki'' stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies. <br> [http://www.cdc.gov/dpdx/intestinalAmebae/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Epolecki_cyst_tric3.jpg | Cyst of ''E. polecki'' stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies. <br> [http://www.cdc.gov/dpdx/intestinalAmebae/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Epolecki_cyst_tric4.jpg | Cyst of ''E. polecki'' stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies. <br> [http://www.cdc.gov/dpdx/intestinalAmebae/gallery.html <font size="-2">''Adapted from CDC''</font>]
 E_polecki_cyst1.jpg | Cyst of ''E. polecki'' stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies. <br> [http://www.cdc.gov/dpdx/intestinalAmebae/gallery.html <font size="-2">''Adapted from CDC''</font>]
 E_polecki_cyst2.jpg | Cyst of ''E. polecki'' stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies. <br> [http://www.cdc.gov/dpdx/intestinalAmebae/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 1,796: / Line 1,717: @@
 C_philippinensis_egg3.jpg | Egg of ''C. philippinensis'' in an unstained wet mount of stool. <br> [http://www.cdc.gov/dpdx/intestinalCapillariasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 C_philippinensis_egg1.jpg | Egg of ''C. philippinensis'' in an unstained wet mount of stool. <br> [http://www.cdc.gov/dpdx/intestinalCapillariasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 C_philippinensis_egg2.jpg | Egg of ''C. philippinensis'' in an unstained wet mount of stool. <br> [http://www.cdc.gov/dpdx/intestinalCapillariasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 C_philippinensis_egg4.jpg | Egg of ''C. philippinensis'' in an unstained wet mount of stool. <br> [http://www.cdc.gov/dpdx/intestinalCapillariasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 1,810: / Line 1,730: @@
 C_philippinensis_HE2.jpg | Higher magnification of Figure 3, showing stichocytes within the adult worm. <br> [http://www.cdc.gov/dpdx/intestinalCapillariasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 C_philippinensis_tissue_4.jpg | Cross-section of a gravid adult female ''C. philippinensis'' from an intestinal biopsy specimen, stained with H&E. Shown in this figure are a bacillary band (blue arrow), the intestine (red arrow) and uterus containing an egg in cross-section (black arrow). <br> [http://www.cdc.gov/dpdx/intestinalCapillariasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 1,835: / Line 1,756: @@
 Leish_amasti_HnE_tissue_mn.jpg |  Amastigotes of ''Leishmania'' sp. in a biopsy specimen from a skin lesion, stained with hematoxylin and eosin (H&E). <br> [http://www.cdc.gov/dpdx/leishmaniasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Leish_skin_DPDx.jpg | ''Leishmania mexicana'' in a biopsy specimen from a skin lesion stained with H&E. The amastigotes are lining the walls of two vacuoles, a typical arrangement. The species identification was derived from culture followed by isoenzyme analysis. <br> [http://www.cdc.gov/dpdx/leishmaniasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 1,860: / Line 1,780: @@
 Loa_knotts_100x.jpg | Microfilariae of ''L. loa'' captured by the Knotts concentration technique. Image taken at 100x magnification. <br> [http://www.cdc.gov/dpdx/loiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Loa_knotts_500x.jpg | Higher magnification of the microfilariae in Figure 7, taken at 500x oil magnification. <br> [http://www.cdc.gov/dpdx/loiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 1,924: / Line 1,843: @@
 ======''Mansonella ozzardi''======
 '''Microfilariae of ''Mansonella ozzardi'''''
 <gallery widths=200px>
@@ Line 1,931: / Line 1,849: @@
 M_ozzardi_BAM3.jpg | Microfilaria of ''M. ozzardi'' in a thick blood smears, stained with Giemsa. <br> [http://www.cdc.gov/dpdx/mansonellosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 M_ozzardi_BAM4.jpg | Microfilaria of ''M. ozzardi'' in a thick blood smear, stained with Giemsa. Note the hook-like end to the tail in this figure. <br> [http://www.cdc.gov/dpdx/mansonellosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 ======''Mansonella perstans''======
 '''Microfilariae of ''Mansonella perstans'''''
 <gallery widths=200px>
@@ Line 1,952: / Line 1,867: @@
 ======''Mansonella streptocerca''======
 '''Microfilariae of ''Mansonella streptocerca'''''
 <gallery widths=200px>
 M_streptocerca_2x2.jpg | Microfilaria of ''M. streptocerca'', fixed in 2% formalin and stained with hematoxylin. <br> [http://www.cdc.gov/dpdx/mansonellosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 1,963: / Line 1,876: @@
 ======''Mesocestoides'' spp.======
 '''''Mesocestoides'' spp. proglottids and scoleces'''
 <gallery widths=200px>
@@ Line 1,971: / Line 1,883: @@
 Mesocestoides_proglottid_BAM2.jpg | Mature proglottids of ''Mesocestoides'' sp. stained with carmine. Shown in this specimen are the vagina (VA), cirrus sac (CS), bilobed ovary (OV) and numerous testes (TE). <br> [http://www.cdc.gov/dpdx/mesocestoidiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Mesocestoides_scolex_BAM.jpg | Scolex of ''Mesocestoides'' sp. stained with carmine. In this field, two of the suckers are clearly visible. Note that lack of rostellar hooklets. <br> [http://www.cdc.gov/dpdx/mesocestoidiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 '''''Mesocestoides'' spp. tetrathyridia'''
 <gallery widths=200px>
 Mesocestoides_mouse_liver.jpg | Tetrathyridium of ''Mesocestoides'' sp. in the liver of a laboratory-infected mouse. <br> [http://www.cdc.gov/dpdx/mesocestoidiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 1,985: / Line 1,896: @@
 ======''Metagonimus yokogawai''======
 '''''Metagonimus yokogawai'', adult fluke'''
 <gallery widths=200px>
 M_yokogawi_adult_BAM.jpg | Adult ''M. yokogawai'', stained with carmine. In this figure, the following structures are labeled: oral sucker (OS), pharynx (PH), intestine (IN), genitoacetabulum (GA), ovary (OV), the large, paired testes (TE), and eggs within the uterus (EG). <br> [http://www.cdc.gov/dpdx/metagonimiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 '''Snail intermediate hosts of ''M. yokogawai'''''
 <gallery widths=200px>
 Semisulcospira_Conchology_A.jpg | Snail in the genus, ''Semisulcospira''. Image courtesy of Conchology, Inc, Mactan Island, Philippines. <br> [http://www.cdc.gov/dpdx/metagonimiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Semisulcospira_Conchology_B.jpg | Snail in the genus, ''Semisulcospira''. Image courtesy of Conchology, Inc, Mactan Island, Philippines. <br> [http://www.cdc.gov/dpdx/metagonimiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 2,009: / Line 1,918: @@
 Ecuniculi_spores_gramchromo3_2012.jpg | ''Encephalitozoon cuniculi'' spores stained with Gram Chromotrope. <br> [http://www.cdc.gov/dpdx/microsporidiosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Ec_MAYO_Trichrome1.jpg | Spores of ''E. cuniculi'' from urine stained with Ryan's modified trichrome (Trichrome blue). <br> [http://www.cdc.gov/dpdx/microsporidiosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Ec_MAYO_Trichrome2.jpg | Spores of ''E. cuniculi'' from urine stained with Ryan's modified trichrome (Trichrome blue). <br> [http://www.cdc.gov/dpdx/microsporidiosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Ec_MAYO_Trichrome3.jpg | Spores of ''E. cuniculi'' from urine stained with Ryan's modified trichrome. <br> [http://www.cdc.gov/dpdx/microsporidiosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Ec_MAYO_KidneyTrichrome.jpg | Spores of ''E. cuniculi'' in a kidney biopsy specimen stained with Ryan's modified trichrome. <br> [http://www.cdc.gov/dpdx/microsporidiosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 2,019: / Line 1,926: @@
 ======''Encephalitozoon hellem''======
 <gallery widths=200px>
 E_hellum_SEM_2012.jpg | Scanning electron micrograph showing an eukaryotic cell bursting and releasing spores of ''Encephalitozoon hellem'' to the extracellular medium. <br> [http://www.cdc.gov/dpdx/microsporidiosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
@@ Line 2,032: / Line 1,938: @@
 Msp_parasit_vac2012.jpg | Transmission electron micrograph of ''E. intestinalis'' depicting developing forms inside a parasitophorous vacuole (red arrows) with mature spores (black arrows). <br> [http://www.cdc.gov/dpdx/microsporidiosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 E_intestinalis_calcofluor_2012.jpg | ''Encephalitozoon intestinalis'' stained with Calcofluor white. <br> [http://www.cdc.gov/dpdx/microsporidiosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 2,045: / Line 1,950: @@
 ======''Nosema'' spp.======
 ======''Pleistophora'' sp.======
 ======''Trachipleistophora'' spp.======
 ======''Vittaforma corneae''======
@@ Line 2,097: / Line 1,999: @@
 ======''Oesophagostomum'' spp.======
 '''Eggs of ''Oesophagostomum'' spp.'''
 <gallery widths=200px>
@@ Line 2,112: / Line 2,013: @@
 Oesophagostomum_L3_ZAF3.jpg | Mid-section of the specimen in Figures 1 and 2. Notice the alternating triangular-shaped intestinal cells (IN). <br> [http://www.cdc.gov/dpdx/oesophagostomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Oesophagostomum_L3_ZAF4.jpg | Tail-end of the specimen in Figures 1-3. Notice the long tail space (arrow) and long, tapering tail sheath. <br> [http://www.cdc.gov/dpdx/oesophagostomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 '''Adults of ''Oesophagostomum'' spp.'''
 <gallery widths=200px>
@@ Line 2,130: / Line 2,029: @@
 '''''Oesophagostomum'' spp. in tissue specimens'''
 <gallery widths=200px>
@@ Line 2,142: / Line 2,040: @@
 ======''Onchocerca volvulus''======
 '''Microfilariae of ''Onchocerca volvulus'' in tissue'''
 <gallery widths=200px>
@@ Line 2,151: / Line 2,048: @@
 O_volvulus_filaria_BAM4.jpg | Coiled microfilaria of ''O. volvulus'', in a skin nodule from a patient from Zambia, stained with H&E. Image taken at 1000x oil magnification. <br> [http://www.cdc.gov/dpdx/onchocerciasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 O_volvulus_adult_HB.jpg | Cross-section of an adult female ''O. volvulus'', stained with H&E. Note the presence of many microfilariae within the uterus. <br> [http://www.cdc.gov/dpdx/onchocerciasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 '''Adults of ''Onchocerca volvulus'' in tissue'''
 <gallery widths=200px>
@@ Line 2,170: / Line 2,065: @@
 ======''Opisthorchis felineus''======
 '''Adults of ''Opisthorchis felineus'''''
 <gallery widths=200px>
 O_felineus_Korea.jpg | Adult of ''O. felineus''. Image courtesy of the Web Atlas of Medical Parasitology and the Korean Society for Parasitology. <br> [http://www.cdc.gov/dpdx/opisthorchiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
@@ Line 2,184: / Line 2,077: @@
 </gallery>
 ======''Opisthorchis viverrini''======
 '''Eggs of ''Opisthorchis viverrini'' in wet mounts'''
 <gallery widths=200px>
 O_viverrini_egg_wtmt_BAM1.jpg | Egg of ''O. viverrini'' in an unstained wet mount of concentrated stool. Image taken at 400x magnification. <br> [http://www.cdc.gov/dpdx/opisthorchiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
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 '''Adults of ''O. viverrini'''''
 <gallery widths=200px>
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 </gallery>
 '''Adults of ''Paragonimus'' spp.'''
 <gallery widths=200px>
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 ======''Philophthalmus'' spp.======
 '''''Philophthalmus'' spp, adult flukes'''
 <gallery widths=200px>
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 </gallery>
 '''Indirect immunofluorescence using monoclonal antibodies against ''Pneumocystis jirovecii'''''
 <gallery widths=200px>
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 =====''Retortamonas intestinalis''=====
 '''''Retortamonas intestinalis'', trophozoites'''
 <gallery widths=200px>
 R_intestinalis_troph_BAM1.jpg | Trophozoite of ''R. intestinalis'' in a stool specimen, stained with trichrome. <br> [http://www.cdc.gov/dpdx/retortamonas/gallery.html <font size="-2">''Adapted from CDC''</font>]
 R_intestinalis_troph_BAM2.jpg | Trophozoite of ''R. intestinalis'' in a stool specimen, stained with trichrome. <br> [http://www.cdc.gov/dpdx/retortamonas/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 '''''Retortamonas intestinalis'', cysts'''
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 S_japonicum_egg_BAM1.jpg | Egg of ''S. japonicum'' in an unstained wet mount of stool. <br> [http://www.cdc.gov/dpdx/schistosomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 S_japonicum_egg_BAM2.jpg | Egg of ''S. japonicum'' in an unstained wet mount of stool. <br> [http://www.cdc.gov/dpdx/schistosomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
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 S_mansoni_egg_2X22.jpg | Eggs of ''S. mansoni'' in an unstained wet mount. <br> [http://www.cdc.gov/dpdx/schistosomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 S_mansoni_egg_2X21.jpg | Egg of ''S. mansoni'' in an unstained wet mount. <br> [http://www.cdc.gov/dpdx/schistosomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 S_mansoni_adult_Lammie1.jpg | Adults of ''S. mansoni''. The thin female resides in the gynecophoral canal of the thicker male. <br> [http://www.cdc.gov/dpdx/schistosomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 S_mansoni_adult_Lammie2.jpg | Adults of ''S. mansoni''. The thin female resides in the gynecophoral canal of the thicker male. Note the tuberculate exterior of the male. <br> [http://www.cdc.gov/dpdx/schistosomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
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 ======''Schistosoma mekongi''======
 <gallery widths=200px>
 S_mekongi_egg_2X2a.jpg | Egg of ''S. mekongi''. Note the inconspicuous spine (red arrow). <br> [http://www.cdc.gov/dpdx/schistosomiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
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 =====Sparganosis=====
 '''Proliferating spargana in groin tissue'''
 <gallery widths=200px>
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 Sparganosis_groin_Paraguay_BAM2.jpg | Proliferating spargana in groin tissue of a patient from Paraguay, stained with hematoxylin and eosin (H&E). <br> [http://www.cdc.gov/dpdx/sparganosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Sparganosis_groin_Paraguay_BAM3.jpg | Proliferating sparganum in groin tissue of a patient from Paraguay, stained with hematoxylin and eosin (H&E). <br> [http://www.cdc.gov/dpdx/sparganosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 '''Proliferating spargana in lung tissue'''
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 Sparganosis_lung_Taiwan_BAM3.jpg | Proliferating sparganum in lung tissue in a patient from Taiwan, stained with H&E. <br> [http://www.cdc.gov/dpdx/sparganosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Sparganosis_lung_Taiwan_BAM4.jpg | Higher magnification of the sparganum in Figure 3. In this image, calcareous corpuscles (green arrows) can be seen. <br> [http://www.cdc.gov/dpdx/sparganosis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 '''Spargana removed from tissue'''
 <gallery widths=200px>
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 ======''Taenia'' spp.======
 '''''Taenia'' spp. eggs'''
 <gallery widths=200px>
 Taenia_eggs_wtmt_400x.jpg | ''Taenia'' sp. eggs in unstained wet mounts. <br> [http://www.cdc.gov/dpdx/taeniasis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
 Taenia_egg.jpg | ''Taenia'' sp. egg in unstained wet mounts. <br> [http://www.cdc.gov/dpdx/taeniasis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
 Taenia_egg_wtmt_OR.jpg |  Iodine-stained wet mount of a ''Taenia'' sp. egg. Image courtesy of the Oregon State Public Health Laboratory. <br> [http://www.cdc.gov/dpdx/taeniasis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
 Taenia_egg1.jpg | Iodine-stained wet mount of a ''Taenia'' sp. egg. Image courtesy of the Oregon State Public Health Laboratory. <br> [http://www.cdc.gov/dpdx/taeniasis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
 Taenia_solium_scolex1.jpg | Unstained ''Taenia'' sp. egg, teased from a proglottid of an adult. Four hooks can easily be seen in this image. <br> [http://www.cdc.gov/dpdx/taeniasis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 '''''Taenia'' spp. scoleces'''
 <gallery widths=200px>
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 '''''Taenia'' spp. proglottids'''
 <gallery widths=200px>
 Taenia_saginata_carmine.jpg | Mature proglottid of ''T. saginata'', stained with carmine. Note the number of primary uterine branches (>12). <br> [http://www.cdc.gov/dpdx/taeniasis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
 T_saginata_OrangeCo.jpg | Mature proglottid of ''T. saginata'', stained with India ink. Note the number of primary uterine branches (>12). Image courtesy of the Orange County Public Health Laboratory, Santa Ana, CA. <br> [http://www.cdc.gov/dpdx/taeniasis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
 Taenia_solium_carmine.jpg | Mature proglottid of ''T. solium'', stained with carmine. Note the number of primary uterine branches (<13). <br> [http://www.cdc.gov/dpdx/taeniasis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
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 </gallery>
 '''Cross-sections of ''Taenia'' spp. stained with hematoxylin and eosin (H&E)'''
 <gallery widths=200px>
 Taenia_cuticle.jpg | Cross-section of a proglottid of ''Taenia'' sp., stained with H&E. Note the thick outer tegument and the loose parenchyma filling the body. Calcareous corpuscles (red arrows), characteristic of the cestodes, can be seen in the parenchyma. Image courtesy of the Washington State Public Health Laboratories. <br> [http://www.cdc.gov/dpdx/taeniasis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
 Taenia_cuticle2.jpg | Cross-section of a proglottid of ''Taenia'' sp., stained with H&E. Note the thick outer tegument and the loose parenchyma filling the body. Calcareous corpuscles (red arrows), characteristic of the cestodes, can be seen in the parenchyma. Eggs (blue arrows) can also be seen. Image courtesy of the Washington State Public Health Laboratories. <br> [http://www.cdc.gov/dpdx/taeniasis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
 Taenia_eggs_HE.jpg | Higher magnification of the image in Figure 2, showing a close-up of the eggs. Note the characteristic striations, typical for the taeniids. Not visible in these images are the hooks commonly seen in cestode eggs. Hooks do not stain with H&E but are refractile and are visible with fine focusing of the microscope <br> [http://www.cdc.gov/dpdx/taeniasis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
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 ImageName.jpg | Close-up of a cross-section of a ''Taenia'' sp. proglottid stained with H&E, showing numerous calcareous corpuscles (yellow arrows). Image courtesy of the Michael E. DeBakey V. A. Medical Center in Houston, TX. <br> [http://www.cdc.gov/dpdx/taeniasis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
 ImageName.jpg | Close-up of a cross-section of a ''Taenia'' sp. proglottid stained with H&E, showing numerous calcareous corpuscles. Image courtesy of Ameripath. <br> [http://www.cdc.gov/dpdx/taeniasis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 '''''Taenia'' spp. adults'''
 <gallery widths=200px>
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 ======''Thelazia'' spp.======
 '''''Thelazia'' spp. adults'''
 <gallery widths=200px>
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 '''Intermediate hosts of ''Thelazia'' spp.'''
 <gallery widths=200px>
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 ======''Toxocara canis''======
 '''''Toxocara canis'' larva hatching'''
 <gallery widths=200px>
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 </gallery>
 ======''Toxocara cati''======
 '''Adult ''Toxocara cati'' worms'''
 <gallery widths=200px>
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 ======''Trichinella'' spp.======
 '''Encysted larvae of ''Trichinella'' in tissue, stained with hematoxylin and eosin (H&E)'''
 <gallery widths=200px>
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 '''Larvae of ''Trichinella'' from bear meat'''
 <gallery widths=200px>
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 Trichostrongylus_egg_wtmt_IN1.jpg | Egg of ''Trichostrongylus'' sp. in an unstained wet mount of stool. Image courtesy of the Indiana State Department of Health. <br> [http://www.cdc.gov/dpdx/trichostrongylosis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
 Trichostrongylus_egg_wtmt_IN2.jpg | Egg of ''Trichostrongylus'' sp. in an unstained wet mount of stool. Image courtesy of the Indiana State Department of Health. <br> [http://www.cdc.gov/dpdx/trichostrongylosis/gallery.html#<font size="-2">''Adapted from CDC''</font>]
 </gallery>
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 Trichostrongylus_female_midsection_200x.jpg | Midsection of the same specimen from Figures 1 and 2.  Note a row of eggs in the uterus. <br> [http://www.cdc.gov/dpdx/trichostrongylosis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
 Trichostrongylus_male_posterior_200x.jpg | Posterior end of a male ''Trichostrongylus'' sp. Note the presence of a bursa (red arrow) and spicule (blue arrow). of a glycerin-mounted specimen, taken at 200x magnification. <br> [http://www.cdc.gov/dpdx/trichostrongylosis/gallery.html# <font size="-2">''Adapted from CDC''</font>]
 </gallery>
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 Tunga_eggs_Spectrum_A.jpg | Eggs of ''T. penetrans'' liberated from the lesion on the second toe of a patient who traveled to Guyana. Image courtesy of Spectrum Health, Grand Rapids, MI. <br> [http://www.cdc.gov/dpdx/tungiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Tunga_eggs_Spectrum_B.jpg | Close-up of the eggs from the specimen in Figure 2. <br> [http://www.cdc.gov/dpdx/tungiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
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 Tunga_tissue_BAM2.jpg | Cross-sections of ''T. penetrans'' in tissue, stained with hematoxylin and eosin (H&E). <br> [http://www.cdc.gov/dpdx/tungiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 Tunga_tissue_BAM3.jpg | Cross-sections of ''T. penetrans'' in tissue, stained with hematoxylin and eosin (H&E). In this image, the following structures are labeled: cuticle (CU), gut (GU), and developing eggs (EG). <br> [http://www.cdc.gov/dpdx/tungiasis/gallery.html <font size="-2">''Adapted from CDC''</font>]
 </gallery>
 ====U====
 ====V====
 ====W====