Biomphalaria straminea check for this species in other resources - Biomphalaria glabrata check for this species in other resources - Schistosoma mansoni check for this species in other resources - natural infection - longitudinal study - Pernambuco - Brazil"/>
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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 97, No. 4, 2002, pp. 465-475
Bioline Code: oc02089
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 97, No. 4, 2002, pp. 465-475

 en A Longitudinal Study on the Natural Infection of Biomphalaria straminea check for this species in other resources and B. glabrata check for this species in other resources by Schistosoma mansoni check for this species in other resources in an Endemic Area of Schistosomiasis in Pernambuco, Brazil
Tereza C Favre; Otávio S Pieri; Luciana C Zani; Jainne M Ferreira; Glauce G Domás; Lilian H Beck & Constança S Barbosa

Abstract

The abundance of snail hosts and the rates of infection with Schistosoma mansoni check for this species in other resources 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 check for this species in other resources and from 0.1 to 7.0 for B. glabrata check for this species in other resources . 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 check for this species in other resources , and decreased from 40.3% to 20.8% in that occupied by B. glabrata check for this species in other resources . 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 check for this species in other resources 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.

Keywords
Biomphalaria straminea check for this species in other resources - Biomphalaria glabrata check for this species in other resources - Schistosoma mansoni check for this species in other resources - natural infection - longitudinal study - Pernambuco - Brazil

 
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