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Abstract 1- Study of the spatial and temporal variations of the freshwater snails and the physicochemical factors affecting the distribution of these snails in Ismailia Governorate. 2- Study of the incidence of natural infection of these snails with different trematode larvae and the possible temporal variation in the prevalence of cercariae in the molluscan species occurring in Ismailia Governorate relative to environmental variations. Moreover, this study constitutes the first contribution to our knowledge of the transmission dynamics of larval trematodes in this area. 3- Investigation of the effect of some plant extracts on some biological and biochemical aspects of some snail vectors. 4- Molecular studies aimed at: a- Study Interspecific variation at the genetic level between different species of snails. b- Detection of infected Biomphalaria alexandrina with Schistosoma mansoni in the early patent period. |