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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 93, No. 6, 1998, pp. 705-710
Bioline Code: oc98196
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 93, No. 6, 1998, pp. 705-710

 en Lymphatic Filariasis in Brazilian Urban Area (Maceió, Alagoas)
Gilberto Fontes; Eliana MM Rocha; Ana C Brito & Carlos Mauricio F Antunes

Abstract

A cross-sectional survey conducted among evening students was used to determine
 the prevalence of Wuchereria bancrofti infection in Maceió, capital of the
 State of Alagoas, northeast Brazil. A single thick-blood smear was used, being collected
 between 10 p.m. and 12 a.m. From a total of 29,551 students enrolled at evening
 elementary schools in the 33 city sectors, 16,569 (56.4%) were random selected for inclusion in the
 study. From those, 10,857 (65.5%) were interviewed and examined and 73 (0.7%) were found to
 have microfilaraemia. Autochthonous W. bancrofti carriers live in 10 of the 33 city
 sectors, suggesting a focal distribution. Moreover, 84% of infections were diagnosed
 among 29% of all students examined, inhabiting three contiguous sectors at the city central area,
 presenting infection rates up to 5.3%. Students living in city sectors with prevalence of
 microfilariae carriers greater than 1% were found to have a higher risk for infection when
 compared to students from the rest of the town [Relative Odds (RO) 12.8, 95% CI 6.7 -
 25.1]. Eleven positive individuals from non endemic areas were living in Maceió for
 more than 10 years; time of residence in the area was a major risk factor for infection
 among students not born in the region (p<0.01). Regarding sex, male students presented a higher
 proportion of positive (RO 1.7, 95% CI 1.1 - 2.9).

Keywords
Wuchereria bancrofti - lymphatic filariasis - epidemiology

 
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