1. From the Departments of Neurology (M.A.N., I.T., Y.A., R.M., M.W., A.C., R.C.-C., R.J.C., D.G.), Pathology (B.K.-D.), Pediatrics (K.S., M.F.), and Microbiology (D.G.), University of Colorado School of Medicine, Aurora; Department of Pathology (Neuropathology) (T.H.-W.), Massachusetts General Hospital, Harvard Medical School, Boston; and Departments of Neurology (A.R.) and Pathology and Laboratory Medicine (E.M.V.), Henry Ford Hospital, Detroit, MI.