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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 101, No. s1, 2006, pp. 235-237
Bioline Code: oc06194
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 101, No. s1, 2006, pp. 235-237

 en Susceptibility of Biomphalaria amazonica check for this species in other resources and Biomphalaria occidentalis check for this species in other resources from Manso Dam, Mato Grosso, Brazil to infection with three strains of Schistosoma mansoni check for this species in other resources
Monica Ammon Fernandez & Silvana Carvalho Thiengo

Abstract

As well as malaria and yellow fever, schistosomiasis is one of the main endemic diseases associated to environments which suffered some impact related to the development of great economic projects, as for example the construction of hydroelectric power stations. Aiming to investigate the occurrence and distribution of freshwater snails of medical and veterinary importance in the area which suffered impact from the Manso hydroelectric power station a survey was performed during the period of 2002 to 2003 and revealed the occurrence of populations of Biomphalaria amazonica check for this species in other resources and Biomphalaria occidentalis check for this species in other resources . Studies on parasite-mollusc compatibility were undertaken using five B. amazonica colonies (Baräo de Melgaço, Poconé, Santo Antônio do Leverger, and Chapada dos Guimaräes, in the Manso and Casca rivers), and four B. occidentalis colonies (Cuiabá, Santo Antônio do Leverger, and Chapada dos Guimaräes, in the Água Fria district and Casca river) were exposed to miracidia of Schistosoma mansoni check for this species in other resources . Of 257 snails of B. amazonica used, 17 became infected (infection index of 6.61%) and all specimens of B. occidentalis proved unsusceptible. According to the strains used, of the 158 snails exposed to BH miracidia, 6 became infected (3.79%); of the 44 exposed to SJ miracidia, 6 became infected (13.63%); and of the 55 snails of B. amazonica exposed to EC miracidia, 5 became infected (9.09%). These results point out the low possibility of introduction of schistosomiasis in those areas, but we believe it can not be discarded as due the presence of B. amazonica .

Keywords
Biomphalaria amazonica - Biomphalaria occidentalis - susceptibility - Schistosoma mansoni - Manso Dam - Brazil

 
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