ABSTRACT
In order to know the distributional patterns of Basommatophoran snails in the state of São Paulo (Brazil), 85 "counties" in the area of S. José do Rio Preto were worked out during seven months (1982). Snails from 286 breeding places were collected and identified. Biomphalaria straminea, an intermediate host of S. mansoni, was found in four little ponds, in the neighbourhood of Altair and S. José do Rio Preto. It was concluded that schistosomiasis has little chance to spread out in the studied area.
Subject(s)
Disease Vectors , Schistosoma mansoni , Snails , Animals , Biomphalaria/parasitology , Brazil , Ecology , Host-Parasite Interactions , Lymnaea/parasitology , Snails/parasitologyABSTRACT
Specimens of Biomphalaria occidentialis and Biomphalaria tenagophila were reared in S. Paulo, Brazil under laboratory conditions, with a view to know their biological characteristics. Oviposition and eggs/oviposition ratio were recorded over twelve months so as to obtain information on the number of egg-masses per animal and the number of eggs per egg-mass, as also the number of hatched eggs per egg-mass for each period of 30 days, i.e., the hatching-rate per period. The incubation period was about the same for both species, but the oviposition and egg oviposition ratio were greater in B. tenagophila.