Unsusceptibility of Biomphalaria occidentalis to infection with a strain of Schistosoma mansoni.
D000818:Animals; D001700:Biomphalaria / Q000469:parasitology*; D001938:Brazil; D006790:Host-Parasite Interactions; D012550:Schistosoma mansoni / Q000502:physiology*; D013045:Species Specificity