On the regulation of schistosomiasis by the effects of the parasite on the snail host.
D000818:Animals; D006790:Host-Parasite Interactions; D006801:Humans; D008433:Mathematics; D008962:Models, Theoretical; D012550:Schistosoma mansoni / Q000502:physiology*; D012552:Schistosomiasis / Q000635:transmission*; D012908:Snails / Q000469:parasitology*