[Immunofluorescence test of antibodies directed against antigens of the intestinal epithelium of Schistosoma mansoni. II. In the bilharziasis patient].

Specific IgM antibodies to antigens present in the epithelial cells of the gut of adult S. mansoni were measured in 2 230 persons living in areas of different levels of endemicity. Significant differences were found in the prevalence of IgM antibodies in the infected patients of the compared bilharziasis foci: lower prevalences were found in high endemic foci, involving the possibility of a tolerance phenomenon.