University of Oxford, University of Oxford, University of Oxford - Centre for Tropical Medicine & Global Health, Indira Gandhi Memorial Hospital, University of Oxford - Department of Paediatrics, University of Oxford - Oxford Vaccine Group, University of London - St. George's, Liverpool School of Tropical Medicine, NHS Foundation Trust - Oxford University Hospitals, NHS Foundation Trust - Oxford University Hospitals, Government of the United Kingdom - Oxford University Hospitals NHS Foundation Trust, University of Oxford, University of Oxford, University of Oxford, Nuffield Department of Medicine, John Radcliffe Hospital, University of Oxford - Nuffield Department of Clinical Medicine and University of Oxford - Nuffield Department of Medicine