biological studies on the snail intermediate hosts of schistosomiasis with a special emphasis on using larval echinostomes as biocontrol agent against larval schistosomes and snails.the present investigation deals with the infectivity of the two snail intermediate hosts of schistosomiasis, biomphalaria alexandrina and bulinus truncatus collected from nine drains in sharkia governorate, egypt. the rate of infection among the snails was general low being 0% in many drains. regarding b. alexandrina, the rate of infection ranged from 4-16%, and in b. truncatus ranged from 4-8%. infection with larval echinostomes was dominant over larval schistosomes in the two snail vectors. th ...200212512810
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