Determination of two populations of Haemonchus contortus in sheep.
D000818:Animals; D007814:Larva / Q000033:anatomy & histology / Q000472:pathogenicity; D012756:Sheep; D012757:Sheep Diseases / Q000209:etiology*; D014251:Trichostrongyloidea / Q000033:anatomy & histology / Q000472:pathogenicity*; D014252:Trichostrongyloidiasis / Q000209:etiology / Q000662:veterinary*