Schistosomiasis mansoni in three localities of western lowland of the state of Maranhão before and after mass treatments

Memórias do Instituto Oswaldo Cruz

Raimundo Nonato Martins Cutrim²  José Rodrigues Coura¹ 

[1] ,Universidade Federal do Maranhão Departamento de Patologia São Luis,Brasil

关键词: schistosomiasis mansoni;    mass treatments;    Maranhão;    Brasil;   

DOI  :  10.1590/S0074-02761992000400015

来源: SciELO

【 摘 要 】

A cross-sectional study for schistosomiasis was carried out in the localities of Aliança, Alegre and Coroatá (districts of Cururupu, São Bento and São João Batista, respectively) in the lowland of the state of Maranhão, after respectively 13, 11 and 4 mass treatments with oxamniquine in the period of ten years (1977-1987). The study included clinical and quantitative fecal examination, skin test for Shistosoma mansoni infection, evaluation of man-water contact of the total population (829 persons) in the three localities and other epidemiological investigations such as infection rate and dynamics of the snail population. After 13 mass treatments in Aliança, the prevalence of S. mansoni infection was reduced from 57.9% to 7.4%. In Coroatá with 11 mass treatments the prevalence fell from 69.2% to 12.8% and in Alegre, with only 4 mass treatments there was pratically no reduction in prevalence: 22.9% to 21%. After mass treatments the type II hepatointestinal clinical form was 10.8% in Aliança, 17.9% in Alegre and 18% in Coroatá. The hepatosplenic (type III) form was not seen in Aliança and Coroatá but unexplanably it was 7.6% in Alegre. There was no correlation between the egg load elimination and the clinical forms.

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