Schistosoma mansoni is associated with which disease?

• A. Malaria
• B. Giardiasis
• C. Trichomoniasis
• D. Schistosomiasis

Answer: (D)

Schistosoma mansoni is a blood fluke that causes schistosomiasis, specifically the intestinal form. Humans acquire it when skin is exposed to freshwater containing cercariae released by snails; the worms migrate to the mesenteric veins and lay eggs that trigger intestinal inflammation and can lead to liver-related symptoms. This is distinct from malaria, which is due to Plasmodium parasites transmitted by mosquitoes, giardiasis caused by Giardia lamblia, and trichomoniasis caused by Trichomonas vaginalis.