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Different isolates of Biomphalaria tenagophila show a large spectrum of compatibility to the trematode Schistosoma mansoni, ranging from entirely refractory to highly susceptible. The aim of this study was to verify the pattern of compatibility of two B. tenagophila geographical isolates, resistant and susceptible to S. mansoni, when infected with Echinostoma paraensei. The snails were exposed to different numbers of miracidia, and mortality, histopathological characteristics and the number of cercariae released were evaluated. A correlation between the number of miracidia and the infectivity rate of B. tenagophila (TAIM) was observed. There was no correlation between the number of miracidia used and the number of cercariae released for both B. tenagophila isolates. Biomphalaria tenagophila (SJC) showed little susceptibility to the E. paraensei infection. The results demonstrate different degrees of compatibility for the two B. tenagophila isolates when infected with E. paraensei, and may contribute to studies about host-parasite relationships

biotemas

Assessment of the experimental infection by Echinostoma paraensei (Lie &amp; Basch, 1967) (Trematoda: Echinostomatidae) in two Biomphalaria tenagophila (D’Orbigny, 1835) (Gastropoda: Planorbidae) isolates resistant and susceptible to Schistosoma mansoni (Sambon, 1907) (Trematoda: Schistosomatidae)