1 Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
2 Neurocritical Care Division, Department of Anesthesia & Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
3 National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
4 Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
5 National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
6 Infectious Disease Epidemiology and Outbreak Response Bureau, Maryland Department of Health and Mental Hygiene, Baltimore, Maryland, USA.