Dynamique de transmission de schistosoma Mansoni en milieu peri-urbain (quartier de Nkolbisson; Yaounde): infestation naturelle d'un hote definitif; la souris blanche; aux differents points de contact homme/eau

Cette etude de la dynamique de transmission de schistosoma Mansoni aborde les facteurs sociaux comportementaux et environnementaux de la maladie; avec en prealable l'identification des sites a risque de transmission. Elle a finalement permis de preciser plusieurs points utiles a la mise en place d'une politique de lutte efficace contre la bilharziose a Nkolbisson

The incidence of schistosomiasis in Bahir-Dar; Ethiopia

A study was made in Bahir-Dar; North-Western Ethiopia; for a period of twelve months; to determine the incidence of Schistosomiasis mansoni. All children aged 10 years and younger in Dil Chibo and Teyima Elementary Schools were stool-examined by the formol-ether concentration technique at the beginning of the study to select schistosomiasis mansoni negative children for a later incidence study. Accordingly; 139 children in Dil Chibo and 104 children in Teyima were found negative and used for an incidence study. In the incidence surveys; the stool specimens were examined by the Kato method. The overall annual incidence rates for Dil Chibo and Teyima school children were 194/1000 and 382/1000 respectively. The rates obtained at the second survey were higher than the rates obtained at the first survey; 164/1000 and 36/1000; respectively; for Dil Chibo and 292/1000 and 77/1000; respectively; for Teyima schools. Males had a higher schistosomiasis incidence than females (P0.01). The incidence also appeared to vary with age. The value of incidence as a measure of transmission is discussed

Transmission of schistosoma mansoni in three ecological settings in Ethiopia : epidemiological aspects

The epidemiological indices of Schistosoma mansoni for three communities in Ethiopia; Jigga (Northwest); Metahara sugar estate (Southeast) and Lake Zway (Central); each representing the three major transmission ecologies in the country; the stream; irrigation scheme and lake; respectively were studied and compared. A total of 2897 people (913; 1614 and 370 from the stream; irrigation scheme and lake; respectively) was examined for S. mansoni ova by the Kato's smear method. The highest human prevalence (58 per cent) and intensity of infection (geometric mean of 450 EPG) were recorded for the lake ecology; whereas the irrigation scheme and stream showed moderate (218 EPG) and light (172 EPG) intensities of infection; despite fairly high disease prevalences of 20 per cent and 41 per cent respectively. Age-specific analysis of prevalence; intensity of infection and relative index of potential contamination (RIPC) indicated that children in their second decade of life to be most responsible. Nevertheless; the decline of all indices with increasing age was less obvious in the lake area than others. The disparity between prevalence and intensity of infection and their implication in disease control tactics are discussed