FILES, V S A study on the comparative susceptibility of snail vectors to strains of Schistosoma mansoni. [electronic resource] - The Journal of parasitology Dec 1949 - 555-60 p. digital Publication Type: Journal Article ISSN: 0022-3395 Subjects--Topical Terms: AnimalsDisease SusceptibilityHumansSchistosomaSchistosoma mansoniSnails