Question

a 22-year-old woman attends the family planning clinic. during routine physical examination, a non-tender indurated ulcer is noted on her labia majora. what is the most likely causative microorganism?
treponema pallidum
herpesvirus
human papillomavirus
chlamydia trachomatis
molluscum contagiosum

Explanation:

A non - tender indurated ulcer on the labia majora is a characteristic of a chancre, which is caused by Treponema pallidum (the causative agent of syphilis). Herpesvirus causes painful vesicles, Human papillomavirus causes warts, Chlamydia trachomatis causes cervicitis or urethritis (usually without ulceration), and Molluscum contagiosum causes umbilicated papules, not indurated ulcers.

Answer:

A. Treponema pallidum