A systematic survey was carried out in the area of the 6th Administrative Region of the State of S.Paulo, in order to discover the distributional patterns of planorbidic snails. Biomphalaria tenagophila is incriminated as the intermediary of Schistosoma mansoni in Bebedouro county where some human cases of the disease have been observed since 1976. Biomphalaria straminea lives at two breeding places - in Serrana and Ribeirão Preto. It is concluded that there is little possibility of schistosomiasis spreading in the studied area.
Planorbidae; Schistosomiasis; Epidemiology
