title: Acquired resistance to echinostomes in four Biomphalaria glabrata strains.
mesh_terms: D000818:Animals; D001700:Biomphalaria / Q000276:immunology / Q000469:parasitology*; D004449:Echinostoma / Q000254:growth & development* / Q000528:radiation effects; D007110:Immunity, Active; D013045:Species Specificity