Susceptibility of Biomphalaria peregrina from Brazil and Ecuador to two strains of Schistosoma mansoni
Paraense, W.L.; Corrêa, L.R.
Revista do Instituto de Medicina Tropical de Sao Paulo 15(3): 127-130
1973
ISSN/ISBN: 0036-4665 PMID: 4732745 Document Number: 64788
Of 20 Biomphalaria peregrina from Lapa, State of Parana, Brazil, each exposed to 20 Schistosoma mansoni miracidia of the BH strain, 9 became infected and only one of these shed cercariae. Of 21 B. peregrina from Chillogallo, near Quito, Ecuador, each exposed to 10 S. mansoni miracidia of the BH strain, 7 became infected and 5 of these shed cercariae. Of 26 B. peregrina also from Chillogallo, each exposed to 10 S. mansoni miracidia of the SJ strain, 4 became infected and 3 produced cercariae. Nearly all infected B. peregrina from Lapa died during the incubation period with massive involvement of the internal organs. Several characteristics (infection rate, mean incubation period, cercerial output, survival of infected snails and mean period of cercarial output) indicate that B. peregrina from Lapa and Chillogallo are susceptible to infection with BH and SJ strains of S. mansoni. They also seem to indicate that the BH strain is more compatible with the Chillogallo snails than is the SJ strain.