title: Ostertagia ostertagi: protective immunity in calves. The development in calves of a protective immunity to infection with Ostertagia ostertagi.
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000209:etiology / Q000276:immunology*; D007110:Immunity, Active; D007814:Larva / Q000276:immunology; D008297:Male; D013997:Time Factors; D014251:Trichostrongyloidea / Q000276:immunology; D014252:Trichostrongyloidiasis / Q000209:etiology / Q000276:immunology / Q000662:veterinary*