RESUMEN
A field study was carried out on 5000 inhabitants, in Sinhera village, kaliobia governorate, to evaluate the relationship between water contact and the prevalence and morbidity of bilharziasis. Two methods were used to evaluate this relationship: observation method and a questionnaire method. From the results, it was evident that males have higher frequency of water contact, higher prevalence of bilharzia-sis and more severe clinical gradients than females. The age group of 10-p14 years suffers more than any other age both for males and females. The socio-economic standard of inhabitants plays it influence on the prevalence of bilharziasis through water contact activities. It was shown that those with low education and income levels, living in mud-brick house without safe water supply or sewage disposal, have the highest frequency of water contact and the highest prevalence of bilharziasis. The snail survey showed marked high prevalence, density and infectivity of Biom Alexandrina over Bul. truncates, in the canal and irrigation channels of Sinhera village. So, water contact must be taken in consideration in planning any control program against bilharziasis