title: Variations in infectivity for Biomphalaria glabrata in strains of Schistosoma mansoni from the same geographical area.
abstract: Genetic differences in infectivity for intermediate snail hosts in two strains of S. mansoni from the same geographical area and within a single isolated parasite population are reported. The importance of recognizing the potential for such genetic variation is stressed.
mesh_terms: D000818:Animals; D001700:Biomphalaria / Q000469:parasitology*; D011647:Puerto Rico; D012550:Schistosoma mansoni