Community-acquired pneumonia causes

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Chetan Lokhande, M.B.B.S [2]

Overview

Community-acquired pneumonia can be caused by viral, bacterial, and fungal organisms. Causative etiology varies with age, immune status, epidemiologic background, and comorbidity.

Causes

Common causes

Neonates
  • Bacteria
  1. Listeria monocytogenes
  2. Mycobacterium tuberculosis
  • Viruses
  1. Herpes simplex virus
  2. Adenovirus
  3. Mumps
  4. Enterovirus
Children
  • Bacteria
  1. Mycoplasma pneumoniae
  2. Chlamydophila pneumoniae
  3. Legionella pneumophila
  4. Chlamydia trachomatis
  • Viruses
  1. Respiratory syncytial virus (RSV)
  2. Metapneumovirus
  3. Adenovirus
  4. Parainfluenza
  5. Influenza
  6. Rhinovirus
Adults
  • Typical Bacteria
  1. Streptococcus pneumoniae
  2. Hemophilus influenzae
  3. Escherichia coli
  4. Klebsiella pneumoniae
  5. Pseudomonas aeruginosa
  • Atypical Bacteria
  1. Mycoplasma pneumoniae
  2. Chlamydophila pneumoniae
  3. Legionella pneumophila
  • Viruses
  1. Influenza
  2. Parainfluenza
  3. Respiratory syncytial virus (RSV)
  4. Metapneumovirus
  5. Adenovirus
  • Newborn infants, children, and adults are at risk for different spectrums of disease causing microorganisms.
  • In addition, adults with chronic illnesses, who live in certain parts of the world, who reside in nursing homes, who have recently been treated with antibiotics, or who are alcoholics are at risk for unique infections.

Causes by Organ System

Cardiovascular No underlying causes
Chemical/Poisoning No underlying cause
Dental No underlying causes
Dermatologic No underlying causes
Drug Side Effect No underlying cause
Ear Nose Throat No underlying causes
Endocrine No underlying causes
Environmental No underlying cause
Gastroenterologic No underlying cause
Genetic No underlying cause
Hematologic No underlying causes
Iatrogenic General anaesthesia
Infectious Disease Acinetobacter baumann, Acinetobacter spp, Actinomycosis, Adenovirus serotypes (1, 2, 3, 4, 5, 7, 14, 21, and 35, Adenovirus, Aids-related opportunistic infections, Aspergillosis , Aspiration, Bacillus anthracis, Bird flu (avian influenza) , BlastomycosisBurkholderia cepacia, Burkholderia pseudomallei , C. pneumoniae, Chicken pox, Chlamydia pneumoniae , Chlamydophila pneumoniae,Coccidioides immitis, Coronaviruses, Cryptococcus neoformans, Cytomegalovirus, Cytomegalovirus, E.coli, Enterovirus 71 ,Enterovirus, Francisella tularenis infection, Gram-negative bacilli, Group b streptococcal infections , H. influenzae, H1n1 flu , Haemophilus influenzae, Hantavirus , Herpes simplex virus, Histoplasma capsulatum, Histoplasmosis, Human bocavirus,Human parechovirus types 1, 2, and 3, Influenza, K.pneumonia, Klebsiella sp, Legionella pneumophila, [Legionella species]], Legionnaires' disease, Listeria monocytogenes, M. pneumoniae, Measles, Melioidosis, Metapneumovirus, Middle east respiratory syndrome coronavirusMoraxella catarrhalis, Mumps, Mycobacterium avium-intracellulare, Mycobacterium haemophilum , Mycobacterium kansasii, Mycoplasma pneumoniae, Neisseria meningitidis, New haven coronavirus, Nocardia, Paragonimiasis , Parainfluenza , Parainfluenza virus type 1 , Parainfluenza virus type 2, Parainfluenza virus type 3 , Parainfluenza virus type 4 .., Parainfluenza, Pittsburgh pneumonia, Pneumococcal pneumonia , Pneumococcus, Pneumocystis jiroveci, Pneumonic plague , Proteus, Pseudomonas aeruginosa, Pseudomonas pseudomallei , Psittacosis , Psittacosis, Q fever , Q fever, Rat-bite fever, Respiratory syncytial virus, Respiratory viruses, Rhinovirus,Rhodococcus equi, S. pneumoniae, Sars ., Sars, Serratia , Severe acute respiratory syndrome, Sporotrichosis Staphylococcus aureus, Streptococcus agalactiae, Streptococcus group a, Streptococcus pneumoniae, Swine flu, Toxocariasis ,Toxoplasma gondii, Trichosporon , Trypanosomiasis , Type a influenza , Type a influenza subtype h1 , Type a influenza subtype h10n71,Type a influenza subtype h1n1, Type a influenza subtype h1n2 1, Type a influenza subtype h2n2 , Type a influenza subtype h3n2, Type a influenza subtype h5 , Type a influenza subtype h5n1 , Type a influenza subtype h7 , Type a influenza subtype h7n2 , Type a influenza subtype h7n3 ,Type a influenza subtype h7n7 , Type a influenza subtype h9 , Type a influenza subtype h9n2, Type b influenza , Type c influenza ,Typhus, Varicella-zoster virus, Yersinia enterocolitica, Yersinia pestis, Zygomycosis,
Musculoskeletal/Orthopedic No underlying causes
Neurologic No underlying causes
Nutritional/Metabolic No underlying cause
Obstetric/Gynecologic No underlying causes
Oncologic No underlying cause
Ophthalmologic No underlying causes
Overdose/Toxicity No underlying cause
Psychiatric No underlying causes
Pulmonary No underlying causes
Renal/Electrolyte No underlying causes
Rheumatology/Immunology/Allergy No underlying cause
Sexual No underlying causes
Trauma No underlying causes
Urologic No underlying causes
Miscellaneous No underlying cause

Causes in Alphabetical Order

References