This study focuses on the geographic distribution of the snail of the genus Biomphalaria and evaluates its infectivity byOf the state's 853 municipalities distributed in the 12 political-administrative mesoregions, 283 have been studied for the snail's prevalence. B. glabrata has been reported in 65.3% of the municipalities studied; B. straminea in 43.8%; B. tenaghophila in 20.4%; B. peregrina in 20.1%; B. schrammi in 9.2%; B. intermedia in 7%, and B. occidentalis in 0.7% . The municipality in Brazil is the local political-administrative division, corresponding roughly to a county or prefecture. It is governed by a mayor and municipal council. Some municipalities are almost completely urbanized, others almost totally rural, and some, like Juiz de Fora, a mixture of the two.The most recent scientific report on the occurrence of Biomphalaria in Juiz de Fora municipality, the main social and economic center in the state's Zona da Mata So, this work focuses on the geographic distribution of Biomphalaria in Juiz de Fora municipality with identification of the species found, possibility of infectivity, and main types of related habitats. This updated study of the occurrence of intermediate hosts in the region confirms, for the first time, the presence of B. straminea in the municipality, with the study of this snail susceptibility of the Juiz de Fora strain to S. mansoni. MATERIALS AND METHODSLocation under study -This study was carried out in the municipality of Juiz de Fora (21S14/42W14), in the mesoregion known as the Zona da Mata Mineira, Minas Gerais, Brazil (Fig. 1). This municipality is located 280 km from Belo Horizonte, the state capital, and 184 km from the city of Rio de Janeiro. Juiz de Fora has a land area of 1,429.875 km 2 , with a population of 419,226 inhabitants according to the 2000 census. The municipality, with an average altitude of 800 m, has an ample hydrographic basin rich in lakes, ponds, and irrigation ditches. The spatial localization of the foci was determined by instant positioning from a GPS (Global Positioning System) apparatus.Malacological survey -These surveys were performed in collaboration with technicians from DADS/Juiz de Fora (Directorate for Decentralized Health Actions, an organ of the State Health Secretariat). The specimens were collected from lotic and lentic ecosystems in the municipality, predominantly around the urban perimeter, where the characteristics are favorable to the occurrence and spatial dispersion of snails near human populations. We captured the specimens with the aid of tongs and nets. The study was conducted in 2003 to 2004.Snails -After collection, the snails were taken to the laboratory where the living specimens were measured. After examination under artificial light for S. mansoni cercarie, the snails were submitted to squeezing between glass plates to detect the presence of cercariae. Some specimens were separated for morphological identification (Paraense 1975). Another sample of specimens was packed and sent to the René-Rachou Research Center for mole...
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