University of Liverpool - Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool - Department of Health Data Scienc, University of Liverpool - Institute of Infection and Global Health, University of Liverpool - Institute of Infection and Global Health, Chelsea and Westminster Hospital - Department of Neurology, Encephalitis Society, University of Liverpool, The Walton Centre NHS Foundation Trust, The Walton Centre NHS Foundation Trust - Department of Neurology, University of Liverpool, University of Liverpool - Department of Health Data Science, University of Liverpool - Institute of Infection, Veterinary and Ecological Sciences, University of Exeter - Health Economics Group, Encephalitis Society, Liverpool University Hospitals NHS Foundation Trust (LUH) - Tropical and Infectious Disease Unit, University of Liverpool - Institute of Infection, Veterinary and Ecological Sciences, University of Oxford, Independent, University of Liverpool - Department of Health Data Science and University of Liverpool - Institute of Infection and Global Health