Which human disease is caused by drinking untreated stagnant pond water containing microscopic water fleas (Cyclops) infected with nematode larvae?
Answer and explanation
Correct answer: B. dracunculiasis
- Step 1: Dracunculus medinensis (Guinea worm) larvae develop inside Cyclops water fleas. Step 2. When people drink contaminated pond water without filtering, larvae penetrate the gut, mature, and adult female worms emerge painfully through the skin of the legs. Answer: dracunculiasis (Guinea worm disease). Why not the others: Bilharzia is contracted by skin contact with cercariae in water; elephantiasis is transmitted by mosquitoes; typhoid is bacterial.
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