Wellcome Sanger Institute, National Hospital for Tropical Diseases, Wellcome Sanger Institute, University of Cambridge - Cambridge Institute of Therapeutic Immunology & Infectious Disease (CITIID), National Hospital for Tropical Diseases, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Wellcome Sanger Institute, Hospital of Tropical Diseases - Oxford University Clinical Research Unit, Hanoi Medical University, Bach Mai Hospital, Bach Mai Hospital, affiliation not provided to SSRN, Bach Mai Hospital, National Hospital for Tropical Diseases, University of Cambridge - Department of Medicine, University of Cambridge, University of Cambridge, Hospital of Tropical Diseases - Oxford University Clinical Research Unit, University of Cambridge - Department of Veterinary Medicine, Hospital of Tropical Diseases - Oxford University Clinical Research Unit, National Hospital for Tropical Diseases, National Hospital for Tropical Diseases, University of Cambridge - Department of Medicine and Wellcome Sanger Institute