[Irregular anti-P1 allo-antibodies and sinensis clonorchiasis].

A parasitological and immuno-hematological study was undertaken simultaneously in fifty South-East asian refugees at the time of their arrival in France. --in this series the frequency of individuals having a P2 erythrocyte phenotype is 80%. --54 % of these immigrants were found to be carriers of Clonorchis sinensis, a parasite rarely found in Europe. --in 40,7 % of these subjects infested by Clonorchis sinensis, the following properties were disclosed concerning the P1 allo-antibody: slow-P1 red cell agglutination at 22 degrees C, no hemolysis of P1 red cells in vitro, IgM antibody, in weak titers. The immuno-hematological study of the immuno-serums with respect to distomian antigens coupled with adsorption-elution using P1+++ red cells shows a close immunological relationship between the antibody of parasite origin and the anti-P1 allo-antibody.