1. Division of Infectious Disease, Brigham and Women's Hospital, Boston, Massachusetts.
2. Departments of Neurology and Radiology, Brigham and Women's Hospital, Boston, Massachusetts.
3. Department of Neurology, Brigham and Women's Hospital, Boston, Massachusetts.
4. Department of Pathology, Brigham and Women's Hospital, Boston, Massachusetts.
5. Erasmus MC, Department of Virology, Rotterdam, The Netherlands.