1 Laboratory of Persistent Viral Diseases, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT, USA.
2 Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy.
3 Indiana University School of Medicine, Indianapolis, IN, USA.
4 Department of Pathology, Case Western Reserve, University School of Medicine, Cleveland, OH, USA.
5 Department of Neurosciences, University of California-San Diego, La Jolla, CA, USA. dgalasko@ucsd.edu.
6 Laboratory of Persistent Viral Diseases, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT, USA. bcaughey@nih.gov.