JAMB - Biology (1985 - No. 41)
The primary and secondary hosts respectively of bilharzia are
fish and man
man and dog
man and snail
fish and snail
Paaiškinimas
The intermediate hosts of Schistosoma spp. (Bilharziasis) are various species of freshwater snails. Eggs are shed from the human host in feces or urine. Under optimal conditions in the environment, the eggs hatch and release miracidia, which swim and penetrate specific snail intermediate hosts.