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A comparative histopathological study of three snails species -Biomphalaria glabrata, B. tenagophila and B. straminea -which had been infected with Schistosoma mansoni miracidia revealed similar qualitative features, consisting of areas of sporocyst proliferation and differentiation associated with reactive host reaction, at the time they were actively eliminating great number of cercariae. However, in specimens that were exposed to miracidia but failed to eliminate cercariae later on,doi:10.1590/s0074-02761997000400014 pmid:9361747 fatcat:iwbqnqyxdrgljmdqjrgku4pmea