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Epidemiological survey of intestinal schistosomiasis in djohong adamawa cameroon 2. immunological results

, : Epidemiological survey of intestinal schistosomiasis in djohong adamawa cameroon 2. immunological results. Cahiers OO.M.-(Office-de-la-Recherche-Scientifique-et-Technique-Outre-Mer)-Serie-Entomologie-Medicale-et-Parasitologie. 1987; 25(2): 91-100

At Djohong, the immunofluorescent test is positive in 40,1% of the sera of the inhabitants, and 46,8% of the urine tested with a monoclonal antibody contain the specific polysaccharidic antigen characteristic for the genus Schistosoma. In both sexes the prevalence and the geometrical mean reciprocal titer are increasing rapidly with age, with a pick between ten and 14 years, decreasing in young adults, persisting as a plateau among the old people. Both the percentage of positive indirect immunofluorescence tests, and their respective titers, are higher in the young patients with eggs of Schistosoma mansoni in their stools among others without eggs. Inversely, no difference is observed between subjects more than 30 years old, with or without eggs of S. mansoni in their stools. The prevalence by age and sex measured by antigen excretion in urine is smaller to the one measured by elimination of eggs in the stools. Among children, the antigen detection is more sensitive than stool examination. Both methods are useful and complementary for the assessment of the epidemiological status of schistosomiasis in a focus. At Djohong, children are infected very early although very few of them are eliminating eggs of S. mansoni in their stools. The most important group for the dissemination of the parasite is represented by young males belonging to the ethnical groups involved in agriculture: Gbaya, Laka, Dura, Mbum.

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