University of Southampton, Newcastle University, University of Liverpool - Institute of Infection and Global Health, Government of the United Kingdom - Chelsea and Westminster Hospital NHS Foundation Trust, King’s College London - Institute of Psychiatry, Psychology and Neuroscience, University of Utah - Department of Medicinal Chemistry, Newcastle University, Encephalitis International, King’s College London - Institute of Psychiatry, Psychology & Neuroscience (IoPPN), University College London, University of Cambridge, University College London, University of Edinburgh, University of Cambridge - Division of Anaesthesiology, King’s College London, University College London, University of Edinburgh, The University of Manchester, University of Oxford, University of Liverpool - Institute of Infection, Veterinary and Ecological Sciences, Alder Hey Children's NHS Foundation Trust - Department of Neurology, University College London - MRC Clinical Trials Unit, Clinical Neurosciences, Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, UK, Newcastle University and University of Liverpool - Institute of Infection and Global Health