Susceptibilidad de Biomphalaria tenagophila de las cuencas de los ríos Paraná y Uruguay a Schistosoma mansoni

<![CDATA[<B><I>Biomphalaria tenagophila </I>potencial vector of <I>Schistosoma mansoni</I> in the Paran� River basin (Argentina and Paraguay)</B>]]>

“…The behavior of those snails to the possible infection with S. mansoni strain which infect naturally two different species of Biomphalaria is identical to the resistance observed with B. tenagophila from Puerto Hormiguero, on the Uruguay River in the province of Corrientes (Pellegrino et al 1968, Borda & Pellegrino 1976, Paraense & Correa 1978. This is the second opportunity that snails of that species were found naturally refractory to the infection in the province of Corrientes.…”

“…The descendants were considered of the progenitor generation and ten of these snails were identified with the techniques detailed in a previous work (Borda & Rea 1997). These descendants were infected with S. mansoni of SJ 2 strain, from São José dos Campos, São Paulo, Brazil, more adapted to B. tenagophila (Paraense & Corrêa 1989).…”

“…tenagophila and B. straminea exist in the Paraná and Uruguay River basins in Argentina: Misiones, Chaco, Corrientes, and Entre Ríos; in Paraguay: Itapúa and Las Misiones; in Uruguay: Artigas and Salto (Borda & Rea 1995 1989). In previous searches Borda and Rea (1997) demonstrated that B. tenagophila from Ayolas (Paraguay) and from Fuente Salto (Uruguay) exposed to the SJ 2 strain of S. mansoni were infected.…”

The initial epidemiological studies in the low endemicity schistosomiasis area in esteio, Rio Grande do Sul, the southernmost Brazilian State, 1997 to 2000

“…The expansion of schistosomiasis to southern parts of South America has been a concern for many years, exemplified by the long-term vigilance along the Rivers Uruguay and Paraná by the argentinian group from the Universidad Nacional del Nordeste at Corrientes (Borda & Rea 1997). Migration and movement of people from endemic areas produces the oppoturnity for establishment of new foci, especially at big projects like the construction of roads and dams (Southgate et al 2001).…”

Effects of the desiccation on Biomphalaria tenagophila (Orbigny, 1835) (Mollusca) infected by Schistosoma mansoni Sambon, 1907

“…Borda and Rea (1997) believe in the existence of variation in the degree of susceptibility of B. tenagophila to infection by S. mansoni, although there is a predominance of refractory populations in comparison to susceptible ones.…”