an epidemiological study of schistosoma haematobium and s. mansoni infection in thirty-five rural egyptian villages.probability samples of individuals from 35 village communities in the rural egyptian nile valley were examined for the presence of schistosome ova by sedimentation of urine and by the mifc technique for stools. in all there were 12,933 persons selected of which 11,337 provided specimens for examination from a total population of 66,768 persons divided among three governorates: 37% in north central delta, 31% in upper-middle egypt and 32% in the upper egypt. after controlling the differences attr ...19817342382
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