]> 2026-07-31T09:38:56+00:00 WBR0086 0 en ''Actinomyces israelii'' ''Listeria monocytogenes'' ''Nocardia asteroides'' ''Trichomonas spp.'' Trichomoniasis is a sexually transmitted infection caused by ''Trichomonas vaginalis''. It is an anaerobic, flagellated parasite that has a characteristic "cork-screw" motility. ''Shigella spp.'' Microbiology A 38-year-old healthy man presents to the emergency department (ED) for fever, abdominal pain, vomiting, and watery diarrhea. He states that his symptoms have been present for the past 2 days and are progressively worsening. He recently returned from a trip to South America. He reports that during his travel, he ingested unpasteurized milk. Physical examination in the ED is unremarkable. Following appropriate management, the patient is prescribed antibiotics and is then discharged home. Two days later, his stool cultures reveal a gram-positive rod with tumbling motility. Which of the following organisms is most likely responsible for the patient's condition? B Head and Neck Infectious Disease 2020-10-27T23:17:47Z 2459150.4706829 WBR0086