Resistência de Biomphalaria peregrina de Santa Rita do Sapucaí, Minas Gerais, a infec？？o com três cepas de Schistosoma mansoni

the descendants of the planorbid snail biomphalaria peregrina, collected in the region of santa rita do sapucaí, minas gerais, brazil, were exposed to miracidia of three strains of schistosoma mansoni: "le" strain from belo horizonte, state of minas gerais; "sj", strain from s？o josé dos campos, state of s？o paulo and "al" strain from state of alagoas. of 300 snails exposed to miracidia of the three strains, none was infected. on the other hand, 300 biomphalaria glabrata of the control groups showed infection rates of 61.1 to 95.3% with three strains. the mortality rates of b. peregrina and b. glabrata were 20% and 28%, respectively.