Snail intermediate host — DTM&H MCQ

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ModerateEntomology and vector controlSnail intermediate hostDTM&H

Children in a lakeside village have urinary schistosomiasis. Control teams identify freshwater snails in slow-moving water near bathing sites. What is the vector or intermediate host most relevant to this infection?

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Correct answer: E — Bulinus snail

Bulinus snail is the single best answer because Bulinus is the intermediate host for Schistosoma haematobium in many African settings. Biomphalaria snail is plausible in a related presentation, but it is less appropriate because it does not fit the key discriminator in this vignette. The teaching point is that snail ecology influences where transmission occurs and where water-contact interventions are targeted.

Reference: WHO Global Vector Control Response; Manson's Tropical Diseases; CDC Yellow Book 2026