title: Maedi-visna virus infection in commercial flocks of sheep in East Anglia.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis*; D004739:England; D005260:Female; D005779:Immunodiffusion; D008297:Male; D011021:Pneumonia, Progressive Interstitial, of Sheep / Q000453:epidemiology* / Q000276:immunology; D012756:Sheep; D014790:Visna-maedi virus / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral