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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/21804

Title: A Longitudinal Study on the Natural Infection of Biomphalaria straminea and B. glabrata by Schistosoma mansoni in an Endemic Area of Schistosomiasis in Pernambuco, Brazil
Authors: Favre, Tereza Cristina
Pieri, Otávio Sarmento
Zani, Luciana Carvalho
Ferreira, Jainne M.
Domás, Glauce G.
Beck, Lilian H.
Barbosa, Constança Simões
Keywords: Biomphalaria straminea   - Biomphalaria glabrata   - Schistosoma mansoni   - natural infection - longitudinal study - Pernambuco - Brazil
Issue Date: 31-Dec-2002
Publisher: Fundação Oswaldo Cruz, Fiocruz
Citation: Memórias do Instituto Oswaldo Cruz (ISSN: 1678-8060) Vol 97 Num 4
Abstract: The abundance of snail hosts and the rates of infection with Schistosoma mansoni   were monitored monthly for four years in two representative localities subjected to repeated chemotherapy of infected persons. Snail abundance varied from 1.0 to 4.4 collected per person/minute/station for Biomphalaria straminea   and from 0.1 to 7.0 for B. glabrata   . Infection rates of snails in nature varied from 0% to 15% for the former and from 0% to 70% for the latter species. Human infection increased from 35.5% to 61.9% in the locality occupied by B. straminea   , and decreased from 40.3% to 20.8% in that occupied by B. glabrata   . No relationship could be detected between human infection and the snail variables. Despite seasonal variations, natural infection persisted throughout the monitoring period in both snail species. It reached remarkably high levels in B. straminea   when compared to those obtained by other authors probably because of differences in methodology. It is recommended that longitudinal studies should be carried out focally and periodically to avoid underestimating the prevalence of schistosome infection in snails.
URI: http://hdl.handle.net/1807/21804
Other Identifiers: http://www.bioline.org.br/abstract?id=oc02089
Rights: Copyright 2002 - Instituto Oswaldo Cruz - Fiocruz
Appears in Collections:Bioline International Legacy Collection

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