Malignant catarrhal fever in bison.
Malignant catarrhal fever was diagnosed in 3 herds of American bison (Bison bison) in South Dakota from 1973 to 1976. Clinical signs included depression, nasal and ocular discharge, conjunctivitis and keratitis, and diarrhea. Herd morbidity ranged from 3 to 53.8%, and mortality was 100%. At necropsy, ulcerative lesions were found throughout the alimentary tract, trachea, and bronchi. Microscopically, necrotizing vasculitis without thrombosis was found in virtually every organ examined.
D000818:Animals; D001188:Artiodactyla; D002417:Cattle; D005260:Female; D008297:Male; D008304:Malignant Catarrh / Q000453:epidemiology* / Q000382:microbiology / Q000473:pathology; D013023:South Dakota