title: Visna.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000276:immunology; D011021:Pneumonia, Progressive Interstitial, of Sheep / Q000276:immunology / Q000382:microbiology* / Q000473:pathology; D012756:Sheep; D014790:Visna-maedi virus / Q000276:immunology
chemical_list: D000914:Antibodies, Viral