[The choice of intermediate molluscan host by the miracidium of Schistosoma bovis].

When the usual intermediate hosts (B. truncatus and P. metidjensis) and several other species of Molluscs are together exposed to the miracidia of S. bovis, we demonstrate that about 75% of the miracidia penetrate B. truncatus and P. metidjensis, while 25% penetrate the Pulmonates (B. glabrata, B. straminea and H. duryi) and no miracidium penetrates the Prosobranches (M. tuberculata, M. cornuarietis). When the miracidia penetrate the non-vector Molluscs, it takes less than 24 hours for them to get encapsulated, except for B. straminea, in which the reaction takes 24 to 48 hours.