Biomphalaria tenagophila potencial vector of Schistosoma mansoni in the Paraná River basin (Argentina and Paraguay)

Susceptibility and compatibility of Biomphalaria tenagophila from the Río de la Plata basin with Schistosoma mansoni from Brazil

“…Similar results were obtained with snails of that same species collected from five localities in Argentina (Posadas, Berón de Astrada, Rincón de Vences, Maloyas and Goya) and one in Paraguay (Encarnación) (Borda & Rea 2007).…”

“…At the moment, foci of S. mansoni transmission exist in the Brazilian states bordering Northeast Argentina, but epidemiological surveys performed by previous researchers had demonstrated that natural transmission of schistosomiasis does not exist in the Río de La Plata basin of Paraguay, Argentina and Uruguay (Borda & Rea 2007). However, B. tenagophila, that behaved as potential intermediary host of S. mansoni, exists in superficial waters of Yacyretá and Salto Grande dams (Borda & Rea 1997).…”

Susceptibility of Argentinean Biomphalaria tenagophila and Biomphalaria straminea to infection by Schistosoma mansoni and the possibility of geographic expansion of mansoni schistosomiasis

“…Among the species described in Rio Grande do Sul (Brazil), the primary vector of S. mansoni in the South American continent, B. glabrata, is responsible for the occurrence of the disease in the municipality of Esteio 4 . In Uruguay, Paraguay, and Argentina, numerous planorbid breeders have been described in association with B. tenagophila and B. straminea [8][9][10][11][12] , which are known to be natural vectors of S. mansoni. Breeding conditions are favorable for these mollusks in the fl ooded fi elds used for plantations and in irrigation canals and reservoir dams.…”

“…Despite the existence of schistosomiasis foci in the Brazilian states bordering Argentina, Uruguay, and Paraguay, there have been no reports of the natural transmission of schistosomiasis in the basin of the La Plata river in these countries 12,14 . However, experimental studies with populations of B. tenagophila from Argentina, Uruguay, and Paraguay have demonstrated that this species is susceptible to the Brazilian strain of S. mansoni 11,12,[14][15][16] . Paraense & Corrêa 17 assessed the susceptibility of a planorbid population from Uruguay that was morphologically similar to B. straminea and confi rmed an infection rate of 23% after exposure to miracidia of the SJ strain of S. mansoni.…”

Karyological Studies ofBiomphalaria tenagophila (d'Orbigny, 1835) (Gastropoda: Planobidae) from Rio de Janeiro, Brazil

“…Intestinal schistosomiasis is the most widespread of all types of schistosomiasis [7,8]. B. tenagophila is an intermediate host and a vector of Schistosoma mansoni [9]. S. mansoni infects about 83.31 million people worldwide [10].…”