Volume 49, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



is progressively replacing along the Nile River in Egypt. This change has occurred in the past 15–20 years following construction of the Aswan High Dam in the 1960s. The cause is a shift in relative abundance of the snail vectors and is increasing while the latter has disappeared from a village in the Fayoum where formerly only schistosomiasis haematobia was endemic. A cross-sectional household survey in this village in 1991 showed the following prevalence values: , 22.3%; , 3.4%; and mixed infections, 2.8%. Only two children less than 10 years of age had infections. A review of the local Ministry of Health records showed that 1) both species were parasitologically diagnosed during the past 7.5 years, 2) had been abundantly present in the local waterways for the past 10 years and has been found infected with since 1985, 3) has not been detected in the local canals and drains since 1986 and the few found between 1981 and 1985 were not infected, and 4) in this village and in two others in the Fayoum were believed infected by laborers from the Delta who helped build schools in 1984. This change in the distribution of schistosomiasis will impact upon public health and medical practice in Middle and Upper Egypt as it already has in Lower Egypt.


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