1. Oxford Autoimmune Neurology Group, Nuffield Department of Clinical Neurosciences, Nuffield Department of Medicine, Oxford University , John Radcliffe Hospital, Oxford OX3 9DU, UK
2. Division of Neurology, Department of Medicine, University of British Columbia Hospital , Vancouver, British Columbia V6T 2B5, Canada
3. Department of Neurology, Oxford University Hospitals , John Radcliffe Hospital, Oxford OX3 9DU, UK
4. Lao-Oxford-Mahosot Hospital-Wellcome Research Unit OX3 7JX (LOMWRU), Microbiology Laboratory, Mahosot Hospital , Vientiane, Lao PDR
5. Center for Tropical Medicine and Global Health, Nuffield Department of Medicine, New Richards Building, Oxford University , Oxford OX3 7LG, UK
6. Institute of Research and Education Development (IRED), University of Health Sciences, Ministry of Health , Vientiane, Lao PDR
7. Oxford Autoimmune Neurology Group, Nuffield Department of Clinical Neurosciences, Nuffield Department of Medicine, Oxford University, John Radcliffe Hospital , Oxford OX3 9DU, UK
8. Department of Psychiatry, Warneford Hospital, University of Oxford , Oxford, UK
9. Unité des Virus Émergents (UVE: Aix-Marseille Univ-IRD 190-INSERM 1207), IHU Méditerranée Infection , 19-21, Bd Jean Moulin, Marseille 13005, France