Trichomonas vaginalis


Trichomonas vaginalis


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USMLE® Step 1 questions

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Trichomonas vaginalis

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USMLE® Step 1 style questions USMLE

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A 35-year-old woman presents to an outpatient clinic for evaluation of greenish, foul-smelling vaginal discharge for the past two weeks. In addition, she is having pain with sexual intercourse. Past medical history is notable for seasonal allergies. The patient has been sexually active with five partners over the past year. Temperature is 37.5°C (99.5°F), blood pressure is 118/73 mmHg, and pulse is 73/min. Physical examination reveals an erythematous cervix with punctate spots of hemorrhage. Which of the following pathogens is most likely responsible for this patient’s symptoms? 

External References

First Aid








Metronidazole p. 192

Trichomonas vaginalis p. , 725

Trichomonas vaginalis p. , 155, 180

External Links


Trichomonas vaginalis is an anaerobic, flagellated protozoan parasite and the causative agent of trichomoniasis. Symptoms of trichomoniasis can include itching, burning, redness, and swelling of the genitals, as well as pain during sex or urination, and a thin, grayish, or yellow-green discharge. However, not all infected individuals will show symptoms. Transmission usually occurs via direct, skin-to-skin contact with an infected individual, most often through vaginal intercourse. Usually, treatment consists of metronidazole and tinidazole.


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