title: Gastrointestinal nematode immunization trials in cattle.
abstract: Three experiments were conducted to immunize calves against Ostertagia ostertagi, Trichostrongylus axei, and T colubriformis. Calves were given intraperitoneal injections with in vitro-grown parasitic larvae of the three species and IV and intraperitoneal injections of exoantigens obtained from culture media used to grow O ostertagi. None of the treatments provided immunity to subsequent oral challenge exposure with normal infective larvae.
mesh_terms: D000818:Animals; D002417:Cattle; D007114:Immunization; D007814:Larva / Q000276:immunology; D010029:Ostertagiasis / Q000276:immunology*; D014251:Trichostrongyloidea / Q000276:immunology*; D014252:Trichostrongyloidiasis / Q000276:immunology*; D014253:Trichostrongylosis / Q000276:immunology*