title: Topographic shifting of primary sporocysts of Schistosoma mansoni in Biomphalaria pfeifferi as a result of coinfection with Echinostoma caproni.
mesh_terms: D000818:Animals; D001700:Biomphalaria / Q000469:parasitology*; D004449:Echinostoma / Q000502:physiology*; D012550:Schistosoma mansoni / Q000502:physiology*