From the Departments of Pathology (National Prion Disease Pathology Surveillance Center) (C.H., G.P., S.B., E.S., C.H., M.C., C.S.) and Epidemiology and Biostatistics (S.D., D.Y.R.), Case Western Reserve University, Cleveland, OH; and Istituto Neurologico Carlo Besta (A.B.), Milan, Italy. (At 2012-08-07)