羊搔痒症(s scrapie) als and humans All known prion diseases are fatal Since the immune system does not recognize prions as foreign, no natural protection develops Scrapie in sheep was first described during the 18th century. It has been transmitted to other animals such as mink and cats and more rec spongiform e contaminated 牛海绵状脑病 In New Guinea. the Fore people contracted kuru by eating the brains of deceased people Creutzfeldt-Jakob Disease(CD) frequently arises spontaneously while fatal familial insomnia (FFI) Gerstmann-straussler- Schenker(GSS) disease, and 10-15% of c]D are caused by mutations in 人的库鲁病(kuru)、克雅氏病 bar( Creutzfeldt Jakob disease, CJD)+ hum人的库鲁病(kuru)、克雅氏病 (Creutzfeldt Jakob disease, CJD)等 羊搔痒症(scrapie) 牛海绵状脑病 (spongiform encephalopathy)