Biomphalaria tenagophila check for this species in other resources - seasonality - Schistosoma mansoni check for this species in other resources - transmission - São Paulo - Brazil"/>
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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 97, No. s1, 2002, pp. 37-41
Bioline Code: oc02184
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 97, No. s1, 2002, pp. 37-41

 en Schistosomiasis Mansoni in Bananal (State of São Paulo, Brazil). II. Intermediate Hosts
Horacio Manuel Santana Teles; Cláudio Santos Ferreira; Maria Esther de Carvalho; Valquíria Rosa de Lima & Fabiana Zacharias

Abstract

We conducted monthly snail captures in Bananal, State of São Paulo, Brazil, between March 1998 and February 2001, to identify Schistosoma mansoni check for this species in other resources 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 check for this species in other resources , 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.

Keywords
Biomphalaria tenagophila check for this species in other resources - seasonality - Schistosoma mansoni check for this species in other resources - transmission - São Paulo - Brazil

 
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