title: Selection for variations in pathogenicity of Haemonchus contortus isolates.
mesh_terms: D000818:Animals; D005260:Female; D006454:Hemoglobins / Q000032:analysis; D008297:Male; D010270:Parasite Egg Count; D012756:Sheep; D012757:Sheep Diseases / Q000209:etiology / Q000473:pathology; D014251:Trichostrongyloidea / Q000302:isolation & purification / Q000472:pathogenicity*; D014252:Trichostrongyloidiasis / Q000209:etiology / Q000473:pathology / Q000662:veterinary
chemical_list: D006454:Hemoglobins