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Prevalence and Intensity of Schistosoma haematobium and S. mansoni Infection in Qalyub, Egypt

M. A. El Alamy^* AND Barnett L. Cline

We report the preliminary findings of a comprehensive schistosomiasis survey in the Qalyub region of the Nile Delta. A systematic sample of households in eight villages was studied, and 8,712 individuals submitted stool and urine specimens for parasitologic examinations. The prevalence of Schistosoma mansoni infection (40.5%) was much higher than that reported previously in this area, and the prevalence of S. haematobium (27%) was much lower. The geometric mean egg output for both parasites was surprisingly low. The apparent increase in S. mansoni infection may be largely due to the use of a very sensitive parasitologic technique, but the decrease in S. haematobium prevalence is unexplained. Preliminary results of snail surveys, however, indicate a profound decrease in the population levels of Bulinus species, a phenomenon which may be related to ecological changes since construction of the Aswan High Dam.

Accepted for publication December 15, 1976.

^* Director, Center for Field and Applied Research.

Formerly Director, San Juan Laboratories. Present address: Department of Tropical Medicine, Tulane Medical Center, 1430 Tulane Avenue, New Orleans, Louisiana 70112. Send reprint requests to this address.