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Trichomoniasis — USMLE Step 3 MCQ

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EasyAmbulatory Medicine / Primary CareTrichomoniasisUSMLE Step 3

A 31-year-old woman has malodorous vaginal discharge and vulvar irritation. Vaginal pH is 6.0. Wet mount shows motile flagellated organisms and many leukocytes. Which of the following is the most likely diagnosis?

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Correct answer: A — Trichomoniasis

Motile flagellated organisms on wet mount with elevated pH are characteristic of Trichomonas vaginalis infection.

Reference: CDC Sexually Transmitted Infections Treatment Guidelines; CDC doxycycline postexposure prophylaxis guidance