General introduction to some slow virus diseases.
D000453:Aleutian Mink Disease; D000818:Animals; D004679:Encephalomyelitis / Q000662:veterinary; D049673:History, 20th Century; D006801:Humans; D011021:Pneumonia, Progressive Interstitial, of Sheep; D012608:Scrapie; D012756:Sheep; D012757:Sheep Diseases; D012897:Slow Virus Diseases / Q000209:etiology / Q000266:history