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- W1523556805 abstract "Intestinal schistosomiasis is a disease caused by the tre-Schistosoma mansoni (Sambon, 1907). Man is the principal final host of this parasitic worm and the intermediate host is a fresh water snail. The adult worms, which are some 8-15 mm long, inhabit the portal venous system. There, the females produce large amounts of eggs, many of which are excreted with the faeces. The remaining eggs get stuck in the tissues where they die. As a result of the dead eggs bilharzial granulomas are formed which are the main cause of pathologie changes in the host. The excreted eggs hatch on immersion in water and the escaping miracidia can freely live in the water for several hours. If they succeed in penetrating an intermediate host snail (in Ethiopia; Biomphalaria pfeifferi) a mother sporocyst, several daughter sporocysts, and eventually, after some 4-5 weeks, many cercariae are produced, The phase of asexual multiplication in the snail host results in the production of large numbers of exclusively either male or female cercariae. Only snails that have been penetrated successfully by several miracidia may shed cercariae of both sexes. The free living cercariae have a short life span: most of them die within 24 hours. Man may become infected when his skin is exposed to water containing cercariae. When the cercariae penetrate man's skin they are transformed into schistosomules and in some 40-60 days these schistosomules develop into adult worms that migrate to the portal and mesenteric veins. Then eggs are produced again." @default.
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- W1523556805 date "1975-01-01" @default.
- W1523556805 modified "2023-09-23" @default.
- W1523556805 title "The transmission of intestinal schistosomiasis in Begemder Province, Ethiopia." @default.
- W1523556805 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1163187" @default.
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