title: Time of onset and target of immune reactions in sheep with acquired immunity against Haemonchus contortus.
mesh_terms: D000818:Animals; D006188:Haemonchiasis / Q000276:immunology / Q000662:veterinary*; D007110:Immunity, Active; D008297:Male; D012756:Sheep / Q000276:immunology*; D012757:Sheep Diseases / Q000276:immunology*; D014252:Trichostrongyloidiasis / Q000662:veterinary*