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Schistosomiasis intestinal Epidemiology
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Schistosomiasis intestinal Epidemiology 2
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Schistosomiasis, intestinal
Epidemiology
  • S. mansoni is endemic in Africa (including Madagascar), the Arabian peninsula and parts of South America
  • S. japonicum is distributed in China, Taiwan, the Philippines and Sulawesi (Celebes)
  • S. mekongi occurs in the Mekong River area of Laos, Cambodia and Thailand
  • Humans become infected when they have contact (during bathing, washing, fishing) with freshwater into which snails have shed 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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