title: Bluetongue in cattle: typing of viruses isolated from cattle exposed to natural infections.
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology / Q000276:immunology*; D046508:Culture Techniques; D004197:Disease Reservoirs; D012756:Sheep; D012757:Sheep Diseases / Q000276:immunology*; D013019:South Africa; D014776:Virus Cultivation; D014777:Virus Diseases / Q000662:veterinary*; D014780:Viruses / Q000302:isolation & purification