| malaria, schistosomiasis, and intestinal helminths in relation to microdams in tigray, northern ethiopia. | a survey was undertaken in tigray, northern ethiopia, to assess the prevalence of malaria, schistosomiasis, and intestinal helminths in relation to microdams. the survey took place from march to june 1995, during the dry season, at 41 microdams. at each site the village nearest the dam (within thirty minutes walk) was selected, ten households were randomly chosen, and all family members were examined for malaria and intestinal parasites. the overall study sample was 2271 people, of all age group ... | 1998 | 10376281 |