Investigations of the unimiracidial infection ofSchistosoma intercalatumin snails and the infection of the final host using cercariae of one sex

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Abstract
Infection with single miracidial doses ofSchistosoma intercalatumfrom Cameroun inBulinus forskaliiand from Zaïre inB. globosusresulted in an equal number of male and female infections. The cercarial production of both sexes started at the same time. The male infected snails produced a greater number of cercariae, because of the longer duration of infection.The recovery of schistosomes from infection with male and female cercariae was forS. intercalatum, Zaïre, 38·8 ± 10·6 and 18·7 ± 14·0 respectively.ForS. intercalatumfrom Cameroun, with single sex cercariae from two different populations of intermediate hosts from Zaïre and Cameroun were 38·3 ± 7·3 (♂); 20·3 ± 9·3 (♀) and 35·0 ± 8·7 (♂); 12·2 ± 4·5 (♀), respectively.

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