Imperial College London - Department of Infectious Disease, Imperial College London - Department of Infectious Disease, University College London - MRC Clinical Trials Unit, NIHR UCLH Clinical Research Facility, Imperial College London, NIHR Imperial Clinical Research Facility, University College London - MRC Clinical Trials Unit, Imperial College London - Department of Infectious Disease, Imperial College London - Department of Infectious Disease, Imperial College London, Imperial College London, University College London Hospitals NHS Foundation Trust - Department of Clinical Virology, University College London, Government of the United Kingdom - Chelsea and Westminster Hospital NHS Foundation Trust, Imperial College London, NIHR Imperial Clinical Research Facility, NIHR Imperial Clinical Research Facility, NIHR Imperial Clinical Research Facility, NIHR Imperial Clinical Research Facility, NIHR Imperial Clinical Research Facility, NIHR Imperial Clinical Research Facility, NIHR Imperial Clinical Research Facility, University of Southampton - NIHR Southampton Clinical Research Facility and Biomedical Research Centre, University of Surrey - Surrey Clinical Research Centre, St George’s University London - St George’s Vaccine Institute, Imperial College London - Department of Infectious Disease, Imperial College London - Section of Virology, University College London - MRC Clinical Trials Unit, University College London - MRC Clinical Trials Unit and Imperial College London - Department of Infectious Disease