title: Studies on the duration of immunity conferred by a live-modified sheep pox tissue culture virus vaccine.
mesh_terms: D000818:Animals; D046508:Culture Techniques; D005612:Freeze Drying; D007109:Immunity; D011213:Poxviridae Infections / Q000276:immunology / Q000662:veterinary*; D012756:Sheep; D012757:Sheep Diseases / Q000276:immunology*; D013997:Time Factors; D014611:Vaccination / Q000662:veterinary; D014765:Viral Vaccines; D014776:Virus Cultivation
chemical_list: D014765:Viral Vaccines