Suscetibilidade de Biomphalaria occidentalis do Acre e Mato Grosso à infecção pelo Schistosoma mansoni e sua implicação na epidemiologia da esquistosomose na Amazônia Ocidental, Brasil ()

Abstract

Resumo É testada a suscetibilidade da Biomphalaria occidentalis de Sena Madureira (Acre) e Cuiabá (Mato Grosso) à infecção pelas cepas de Schistosoma mansoni de São José dos Campos (São Paulo) e Paulista (Pernambuco), com resultado negativo. São tecidas considerações sobre os focos de esquistossomose descritos na região Amazônica e discute-se o potencial de transmissão de S. mansoni por B. occidentalis na Amazónia Ocidental.

Resistance of Biomphalaria occidentalis from Varzea das Flores dam, Minas Gerais, to Schistosoma mansoni infection detected by low stringency polymerase chain reaction

“…These results are in accordance with those observed for B. occidentalis from ten localities in the states of Mato Grosso do Sul, Paraná and São Paulo and also for specimens from Acre and Mato Grosso, which did not shed cercariae after experimental infection (Paraense & Corrêa 1982, Coimbra Jr & Engel 1982. All these populations showed to be resistant to infection with Brazilian S. mansoni strains.…”

Susceptibility of Biomphalaria amazonica and Biomphalaria occidentalis from Manso Dam, Mato Grosso, Brazil to infection with three strains of Schistosoma mansoni

“…Paraense and Corrêa (1982) demonstrated unsusceptibility of B. occidentalis to infection with SJ S. mansoni strain, using 1582 specimens from ten localities of the states of Mato Grosso, Mato Grosso do Sul, Paraná, and São Paulo. Similarly, Coimbra Jr. and Engel (1982) did not get infection in the two samples analyzed (Acre and Mato Grosso) after experimental exposition to the PE and SP S. mansoni strains; both strains were established in the Centro de Pesquisas René-Rachou, Minas Gerais: the first was isolated from Pernambuco and the second, similarly to SJ strain used in the present study, from the municipality of São José dos Campos.…”

“…However, these results pointed to the possibility of introduction of schistosomiasis mansoni into the Amazonian region, where this species is widespread. As for B. occidentalis, the results of experiments realized (Paraense & Corrêa 1982, Coimbra Jr & Engel 1982 revealed unsusceptibility of this species to strains of S. mansoni from the states of São Paulo and Pernambuco. These authors however pointed out the need of additional studies with other strains of the parasite.…”

Potential for shistosomiasis in a municipality of Rondônia, Brazilian Amazon

“…Although B. amazonica and B. occidentalis have not yet been found to be naturally infected with S. mansoni (Coimbra Jr. et al 1984;Valadão and Milward-De-Andrade 1991), in vitro studies performed by Paraense and Correa (1982), and Coimbra Jr. and Engel (1982), using strains of the pathogen and snails from Rondônia, showed that B. amazonica is susceptible to infection by the trematode, at very low rates. However, B. occidentalis was not found to be a good host, either in the above-mentioned studies or in others performed by Fernandez and Thiengo (2006) using B. occidentalis from the state of Mato Grosso.…”