<prompt> Prion group of diseases includeCreutzfeldt-Jacob diseaseSubacute sclerosing panencephalitisAlzheimers diseaseParkinson disease  <response>: A Creutzfeldt-Jacob disease Prion Disease: Prions are infectious proteins that cause degeneration of the Central Nervous System CNS. Prion diseases are disorders of protein conformation, the most common of which in humans is called Creutzfeldt-Jackob Disease CJD. CJD typically presents with dementia and myoclonus, is restlessly progressive, and generally cause death within a year of onset. Most CJD patients are between 50 75 years of age; however, patients as young as 17 years and as old as 83 years have recorded. SLOW VIRUS DISEASESGroup A Visna Maedi progressive pneumoniaNon-oncogenic retrovirus Lentivirus, HIVGroup B Affects in human Creutzfeldt Jakob disease Kuru Fatal familial insomnia Gerstmann-Straussler-Scheinker syndrome Sub acute spongioform VE SSVEBovine spongioform encephalopathyMad cow disease Chronic wasting disease of deer elk Scarpie in sheep goats Mink transmissible encephalopathyPrion diseasesCorneal transplant may spread C-J diseaseGroup C SSPE delayed cc of measles Progressive Multifocal LeukoencephalopathyDue to Papova virus 