1 Neuro-Infectious Diseases Group, Department of Neurology and Division of Infectious Diseases, University of Colorado School of Medicine, Aurora, CO, USA.
2 Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.
3 Department of Immunology-Microbiology, University of Colorado School of Medicine, Aurora, CO, USA.
4 Department of Epidemiology, Colorado School of Public Health, Aurora, CO, USA.