Résumé :
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[BDSP. Notice produite par INIST R59VR0xi. Diffusion soumise à autorisation]. Background. Schistosomiasis (Schistosoma mansoni) is classically described as a rural disease that occurs in areas with poor sanitary conditions. This cross-sectional study was undertaken in a suburban area of a large industrialized city in Brazil (Belo Horizonte), aiming at examining epidemiological characteristics of schistosomiasis in an urban setting. Methods. A simple random sample of 658/1896 dwellings was selected and 3049/3290 (92.7%) residents were submitted to stool examination. Of 518 eligible infected cases and 518 uninfected controls, 87.1% and 89.8% participated in the study, respectively. Results. The prevalence of S. mansoni infection was 20%, predominantly low egg counts in stools ; no cases of splenomegaly were found. Signs and symptoms associated with infection were bloody stools (odds ratio [OR]=8.0) and hardened palpable liver at the middle clavicular and at the middle sternal line (OR=5.5 and 8.0, respectively). Sociodemographic variables and water contacts predictive of infection were age (10-19 and 20 yrs ; OR=7.1 and 3.3, respectively), gender (male ; OR=3.1), contacts for swimming and/or playing (twice a month or less and more than twice a month ; OR=2.2 and 3.0, respectively) and residence in Belo Horizonte (born in the City ; OR=2.5). Ninety per cent of dwellings had a piped water supply ; no association between water supply and infection was found. Conclusion. (...)
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