title: Study of the duration of immunity of sheep vaccinated against sheep pox with a live virus vaccine.
mesh_terms: D000818:Animals; D011212:Poxviridae / Q000276:immunology*; D011213:Poxviridae Infections / Q000662:veterinary*; D012756:Sheep; D012757:Sheep Diseases / Q000276:immunology*; D014765:Viral Vaccines / Q000276:immunology*
chemical_list: D014765:Viral Vaccines