Slow virus diseases.
D000368:Aged; D007562:Creutzfeldt-Jakob Syndrome / Q000453:epidemiology; D006801:Humans; D007729:Kuru / Q000453:epidemiology; D007968:Leukoencephalopathy, Progressive Multifocal / Q000453:epidemiology; D008297:Male; D009103:Multiple Sclerosis / Q000209:etiology; D012897:Slow Virus Diseases / Q000453:epidemiology*; D013344:Subacute Sclerosing Panencephalitis / Q000453:epidemiology