Pratiques hygiéniques et risques de contamination des eaux de surface par des œufs de schistosomes: Le cas d'un village infesté dans le nord du Sénégal

The transmission of intestinal schistosomiasis presumes that faecal materials containing viable schistosome eggs reach natural water bodies infested with snail intermediate host. So far there is little knowledge about the contamination dynamics of streams with schistosome eggs. We conducted a pilot study on defecating behaviour and hygienic practices in an Schistosoma mansoni endemic focus in Northern Senegal. Questionnaires were used to obtain quantitative data on hygienic practices and the use of latrines in 59 children. Although the community was well endowed with pit latrines, most of the children declared that they usually defecated somewhere else, in particular near the streams where the vegetation offers hideouts. Observations based on mapping of defecation sites showed that a considerable number of stools were left just a few meters from the riverbank, thus bearing a high risk of being washed off into the water. All these practices can easily lead to contamination of water bodies with schistosomae eggs. In order to improve hygienic practices and reduce fecal pollution of the environment, a health education model respecting local beliefs and customs would be indispensable.