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Prion diseases,or transmissible spongiform encephalopathies(TSEs),are a family ofrapidly progressive,invariably fatal,neurodegenerative disorders affecting both humans and animals,for which no effective therapy is currently available.These diseases share a common pathologicalpathway where normal cellular prion proteins(PrPC) undergo conformational changes into theirabnormal counterparts(PrPSc).Well known prion diseases include scrapie in goats,bovinespongiformencephalopathies(BSE,mad cow disease),and Creutzfeldt-Jakob disease in human etc.