Volume 26, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



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 infection (40.5%) was much higher than that reported previously in this area, and the prevalence of (27%) was much lower. The geometric mean egg output for both parasites was surprisingly low. The apparent increase in infection may be largely due to the use of a very sensitive parasitologic technique, but the decrease in prevalence is unexplained. Preliminary results of snail surveys, however, indicate a profound decrease in the population levels of species, a phenomenon which may be related to ecological changes since construction of the Aswan High Dam.


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