Abstract
Two regions of the Jos Metropolis in Plateau State, Nigeria, with contrasting topographic features and harbouring many snails infested water bodies were surveyed for the presence of cercariae shedding Biomphalaria pfeifferi (Krauss) for a period of 12 months. A significantly marked (P < 0.01) fluctuation in infection rates in field B. pfeifferi was observed between the two areas. The factors contributing to the disparity in shedding capacities are linked to human behavioural pattern, and the drying up of water bodies. Their importance with respect to the control of intestinal schistosomiasis in the region are discussed.
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