[Schistosoma mansoni: development of worms from cercaria irradiated at the porta system level, in mice].

Eight groups of outbred albino mice were infected transcutaneously with cercariae of S. mansoni (strains LE and SJ) irradiated with either 3, 20 or 40 Krad, of gamma radiation from a cobalt-60 bomb and a control non irradiated group. Cercariae irradiated with 20 or 40 Krad failed to develop in the portal system and 3 Krad retarded development. Worms of the SJ strain developed more slowly than the LE strain.