University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, - Department of Epidemiology and Public Health, University of Sheffield - Department of Infection, Immunity & Cardiovascular Disease, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre District Council - District Health Office, Queen Elizabeth Central Hospital, Kamuzu University of Health Sciences - Blantyre Malaria Project, Kamuzu University of Health Sciences - Blantyre Malaria Project, - Center for Vaccine Development and Global Health, - Center for Vaccine Development and Global Health, - Center for Vaccine Development and Global Health, - Center for Vaccine Development and Global Health, University of Maryland, Baltimore (UMB) - School of Medicine, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, - Center for Vaccine Development and Global Health and University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme