The epidemiology and control of schistosomiasis mansoni where Biomphalaria tenagophila is the snail host

Author:

Dias Luiz Candido de Souza1,Glasser Carmen M.2,Etzel Arnaldo2,Kawazoe Urara1,Hoshino-Shimizu Sumie3,Kanamura Hermínia Yohko3,Cordeiro José A.1,Marçal Júnior Oswaldo1,Carvalho José F.1,Gonçales Júnior Fernando L.1,Patucci Rosa3

Affiliation:

1. Universidade Estadual de Campinas, Brasil

2. Superintendência de Controle de Endemias, Brasil

3. Universidade de São Paulo, Brasil

Abstract

The epidemiology and control of schistosomiasis mansoni in the Municipality of Pedro de Toledo (State of S. Paulo, Brazil) since 1980, has been studied. In 1980 the prevalence evaluated by stool exams (Kato-Katz method) was 22.8% and no statistical difference at 5.0% level was observed between rural and urban zones. The intensity of infection was low (58.5 eggs/g of faeces); the highest prevalence and intensity of infection rates were observed within the group of from 5 to 29 years of age, respectively. The transmission of schistosomiasis usually occurred during leisure time. The majority of the carriers of the parasite were asymptomatic. Of the B. tenagophila examined only 0.4% were found to be infected. The control programme has been intensified from 1981 on resulting in a sharp decrease in the prevalence from 22.8% in 1980 to 6% at the present time. This result shows that, in spite of the control programme there is a residual human prevalence. A beginning has been made on the investigation into the possible causes of this residual prevalence (6.0% was maintained through out 1987).

Publisher

FapUNIFESP (SciELO)

Subject

Public Health, Environmental and Occupational Health

Reference1 articles.

1. Os focos autóctones de esquistossomose no Estado de São Paulo;PIZA J. de T.;Arq. Hig.,1960

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