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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 92, No. 4, 1997, pp. 517-522
Bioline Code: oc97093
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 92, No. 4, 1997, pp. 517-522

 en Comparative histopathology of Biomphalaria glabrata, B. tenagophila and B. straminea with variable degrees of resistance to Schistosoma mansoni miracidia
Cecilia Pereira de Souza; Claudia Cunha Borges; Andrea Guimaraes Santana & Zilton A Andrade

Abstract

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,
different histopathological pictures were observed in different snail
species. 

While B. glabrata exhibited frequent focal (granulomatous) proliferation of amebocytes in several organs, B. tenagophila and B. straminea only rarely showed such reactive changes, suggesting that the mechanism of resistance to miracidial infection probably follows different pathways in the snail species studied.

Keywords
Biomphalaria histopathology - Schistosoma mansoni - differential susceptibility

 
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