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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 102, No. 2, 2007, pp. 191-195
Bioline Code: oc07033
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 102, No. 2, 2007, pp. 191-195

 en Biomphalaria tenagophila check for this species in other resources potencial vector of Schistosoma mansoni check for this species in other resources in the Paraná River basin (Argentina and Paraguay)
Borda, C Edgardo & Rea, María Josefa F

Abstract

Susceptibility and compatibility experiments were carried out with 700 Biomphalaria tenagophila check for this species in other resources from the Paraná River basin exposed to infection with Schistosoma mansoni check for this species in other resources . Individual infection was performed with 10 miracidia of SJ2 strain from the Paraiba valley (Brazil) originally infective to B. tenagophila. These snails were laboratory-breed progeny of B. tenagophila collected from six localities of Argentina and one from Paraguay. From Argentina: Rincón de Vences (7%) and Posadas (11%) became infected with S. mansoni and the calculation of Frandsen's index (TCP/100) shows that they were Class II poorly compatible. Those snails from Goya (22%), Maloyas (5%), and Berón de Astrada (3%) were Class III compatible to the S. mansoni. None of the 100 snails exposed from Caá-Catí became infected (Class 0 incompatible). Tested samples from Paraguay (Encarnación) were infected (20%) and compatible (Class III).
It was also studied the persistence of the infection in 244 snails of the first generation (F1) of those that were susceptible from three places. It was demonstrated an increment of the susceptibility in the F1 from Maloyas (χ2 = 27.22; p = 0.0001) and Posadas (χ2= 4.24; p = 0.04).
The results point out the possibility that schistosomiasis might be able to spread into the Paraná River basin where B. tenagophila exists.

Keywords
Biomphalaria tenagophila - potencial schistosome vector - Paraná River basin

 
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