1 From the Department of Neurology (D.B.C.), Washington University in St Louis, MO; and Department of Medicine and Immunology-Microbiology (K.L.T.), University of Colorado School of Medicine, Aurora. clifforddb@wustl.edu.
2 From the Department of Neurology (D.B.C.), Washington University in St Louis, MO; and Department of Medicine and Immunology-Microbiology (K.L.T.), University of Colorado School of Medicine, Aurora.