Question

Lymphogranuloma venereum is caused by

• A. Haemophilus ducreyi
• B. Donovania granulomatis
• C. Treponema pertenue
• D. Chlamydia trachomatis

Hint:

LGV is caused by specific serovars of Chlamydia trachomatis.

Answer 1

The Correct Option is D

Step 1: Recall the four classic STI ulcers.
Medical exams often ask you to match four venereal ulcer diseases with their germs: syphilis, chancroid, granuloma inguinale and lymphogranuloma venereum.

Step 2: Fix LGV to its organism.
Lymphogranuloma venereum is caused by serovars L1 to L3 of Chlamydia trachomatis, giving a tiny painless ulcer followed by big, tender groin nodes.

Step 3: Separate it from the look alikes.
Haemophilus ducreyi gives chancroid, a soft and painful ulcer. Donovania granulomatis gives granuloma inguinale, a beefy red ulcer that keeps growing. Treponema pertenue causes yaws, which is not even sexually spread.

Step 4: Conclude.
\[ \boxed{\text{Chlamydia trachomatis}} \]