title: Further observations on immunization of sheep against Schistosoma mansoni and S. bovis using irradiation-attenuated schistosomula of homologous and heterologous species.
abstract: This paper describes further characteristics of the immunization of sheep against schistosomes using live, irradiation schistosomula. Sheep immunized with a non-virulent strain of Schistosoma mattheei were protected against a more virulent strain of the same species for over a year. As there was no evidence that the irradiated parasites were able to persist this long, it was concluded that the vaccine had induced a sterile resistance. Heterologous vaccination, using irradiated S. mattheei schistosomula to immunize against S. bovis or irradiated S. mansoni schistosomula to immunize against S. mattheei, failed to induce any protection.
mesh_terms: D000818:Animals; D005243:Feces / Q000469:parasitology; D007114:Immunization; D012547:Schistosoma / Q000276:immunology* / Q000528:radiation effects; D012550:Schistosoma mansoni / Q000276:immunology* / Q000528:radiation effects; D012552:Schistosomiasis / Q000469:parasitology / Q000517:prevention & control / Q000662:veterinary*; D012756:Sheep; D012757:Sheep Diseases / Q000469:parasitology / Q000517:prevention & control*