Trachoma — DTM&H MCQ

Correct answer: A — SAFE strategy implementation

The correct answer is A, SAFE strategy implementation. The vignette describes classic trachoma: follicular conjunctivitis in children, trichiasis in adults, abundant flies, and poor water access, which are the exact epidemiological hallmarks of hyperendemic trachoma transmission driven by Chlamydia trachomatis. WHO's recommended public health response to this pattern is the SAFE strategy: Surgery for trichiasis, Antibiotics (azithromycin) to clear ocular infection, Facial cleanliness to reduce transmission, and Environmental improvement (safe water access, sanitation, fly control) to interrupt the transmission cycle. Because the stem features both active disease (follicular conjunctivitis) and its blinding sequela (trichiasis) plus the upstream drivers (flies, water scarcity), only a combined, multi-pronged strategy addresses the full disease spectrum rather than a single intervention. This integrated approach is the basis of global trachoma elimination programmes and is directly applicable to tropical medicine practice assessed in UK postgraduate exams. Why the other options are wrong: E. Measles vaccination campaign: Measles causes a different clinical picture (fever, rash, coryza, conjunctivitis without chronic scarring or trichiasis) and does not address the chronic follicular and cicatricial disease described. C. Indoor residual spraying: This targets vector-borne diseases transmitted by mosquitoes such as malaria, not trachoma, which spreads via eye-seeking flies and direct contact rather than mosquito bites. B. Mass praziquantel alone: Praziquantel treats schistosomiasis and other helminths, is irrelevant to chlamydial conjunctival infection, and even if antibiotics were the correct drug class, a single mass drug administration without the S, F, and E components fails to address trichiasis or ongoing transmission. D. Food fortification with iodine: This addresses iodine deficiency disorders (goitre, cretinism), which is unrelated to the described ocular and hygiene-related pathology. Key point: Follicular conjunctivitis plus trichiasis in a fly-prone, water-scarce setting signals trachoma, which requires the full multi-component SAFE strategy, not a single vertical intervention.

Reference: World Health Organization, Trachoma fact sheet and SAFE strategy guidance, WHO, https://www.who.int/news-room/fact-sheets/detail/trachoma