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Prevalence and Intensity of Schistosoma Haematobium Infection in Six Villages of Upper Egypt^*

A cross-sectional survey for Schistosoma haematobium infection in 5,998 individuals, representing 31,803 persons in six rural villages of the Qena governorate, Upper Egypt, was completed. There were 2,223 persons (37.1%) excreting S. haematobium eggs identified by the nuclepore membrane filtration technique of a single urine specimen. Prevalence of infection ranged from 23.9% to 64.0% among the six villages. Quantitatively the overall geometric mean egg-count was 48.1 eggs/10 ml urine. A survey of proximal canals was conducted and 9 of 4,312 Bulinus snails were infected with schistosomes (0.21%). The stools of 2 of 507 adolescent males were positive for S. mansoni. No Biomphalaria snails were found. When these findings are compared to past studies, S. haematobium prevalence appears to have substantially increased.

Accepted for publication August 28, 1981.

^* This work was supported by the Environmental Protection Agency's River Nile-Lake Nasser Project special currency project number 03-542-1, and in part by the Smithsonian Institute (International Programs), Washington, D.C.

Address reprint requests to: Christopher L. King, Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109.