The effects of the experimental onfection from a focus of transmissopn of Schistosoma mansoni in a population of Biomphalaria tenagophila (D'Orbigny, 1835) in the region of "Vale do Ribeira de Iguape", Brazil - Guimarães, Maria Cristina de Almeida; Muniz, Cynthia; Takahashi, Fernanda Yoshika; Ohlweiler, Fernanda Pires; Kawano, Toshie; Natal, Delsio (Revista do Instituto de Medicina Tropical de São Paulo, 2010)