Comparative Studies On The Ecology Of Bi0mphalaria Pfeifferi (krauss 1847) In Non Endehic And Endehic Areas Of Schistosoma Hansoni (sambon. 1907) In Ethiopia.

The region of Debre Berhan, Where schistosomiasis isrnnot endemic, Vias compared with a' well established focusofrnS.mansoni, vlonji , with regard to climate, snail habitat srnand snail differences in susceptibility and growth rate.rnIn general rain and changes associated with it have influqncernon the snail yopulation but this does not account for thernlack of endemic schistosomiasis. Snails from both areasrnwere equally susceptible to infection with §.mansoni. Thernlow mean temperature in Debre Berhan increased the incubationrnperiod of the parasite. Mortality rate of Debre Berhan snailsrnwas higher than th~£e of wonji snails while the growth raternwas vice verSI1. Despite the relatively unfavourable conditions, thernpossibility of introduction of schistosomiasis to DebrernBerhan as a result of environmental modifications that mayrnbring changes in human activities can not be discounted.

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