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Schistosomiasis, urinary Epidemiology
- S. haematobium is focally distributed in Africa and the Middle East (prevalence is especially high in West Africa and the Nile Valley)
- Humans are infected by penetrating cercariae
- Schoolchildren have the highest worm burden in endemic areas. A partial immunity (“concomitant immunity”) protects adults from reinfection.
- Building of dams and irrigation system favours habitats for the intermediate host snail
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