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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/20055

Title: Schistosomiasis Mansoni in Bananal (State of São Paulo, Brazil). II. intermediate hosts
Authors: Teles, Horacio Manuel Santana
Ferreira, Cláudio Santos
Esther de Carvalho, Maria
Rosa de Lima, Valquíria
Zacharias, Fabiana
Keywords: Biomphalaria tenagophila   - seasonality - Schistosoma mansoni   - transmission - São Paulo - Brazil
Issue Date: 31-Dec-2002
Publisher: Fundação Oswaldo Cruz, Fiocruz
Citation: Memórias do Instituto Oswaldo Cruz (ISSN: 1678-8060) Vol 97 Num s1
Abstract: We conducted monthly snail captures in Bananal, State of São Paulo, Brazil, between March 1998 and February 2001, to identify Schistosoma mansoni   vectors, estimate seasonal population changes, and delimit foci. We also evaluated the impact of improvements in city water supply and basic sanitation facilities. We identified 28,651 vector specimens, 28,438 as Biomphalaria tenagophila   , 49 of them (0.2%) infected with S. mansoni , and 213 as B. straminea , none of the latter infected. Vectors predominated in water bodies having some vegetation along their banks. Neither population density nor local vegetation could be linked to vector infection. We found the first infected snails in 1998 (from March to May). Further captures of infected snails ocurred, without exception, from July to December, when rainfall was least. Irrespective of season, overall temperature ranged from 16.5ºC to 21ºC; pH values, from 6.0 to 6.8. Neither factor was associated with snail population density. Frequent contact of people with the river result from wading across it, extracting sand from its bottom, fishing, washing animals, etc. Despite a marked reduction in contamination, cercaria shedding persists. Whatever the location along its urban course, contact with river Bananal, particularly of the unprotected skin, entails risks of infection.
URI: http://hdl.handle.net/1807/20055
Other Identifiers: http://www.bioline.org.br/abstract?id=oc02184
Rights: Copyright 2002 - Instituto Oswaldo Cruz - Fiocruz
Appears in Collections:Bioline International Legacy Collection

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