London School of Hygiene & Tropical Medicine - Vaccines and Immunity Theme, London School of Hygiene & Tropical Medicine, University of Sheffield - Department of Infection, Immunity & Cardiovascular Disease, London School of Hygiene & Tropical Medicine - Medical Research Council Unit: The Gambia, London School of Hygiene & Tropical Medicine - Vaccines and Immunity Theme, London School of Hygiene & Tropical Medicine - Vaccines and Immunity Theme, London School of Hygiene & Tropical Medicine, London School of Hygiene & Tropical Medicine, London School of Hygiene & Tropical Medicine - Vaccines and Immunity Theme, London School of Hygiene & Tropical Medicine - Vaccines and Immunity Theme, London School of Hygiene & Tropical Medicine, London School of Hygiene & Tropical Medicine - Vaccines and Immunity Theme, London School of Hygiene & Tropical Medicine, London School of Hygiene & Tropical Medicine - Vaccines and Immunity Theme, London School of Hygiene & Tropical Medicine, London School of Hygiene & Tropical Medicine - Vaccines and Immunity Theme, London School of Hygiene & Tropical Medicine - Vaccines and Immunity Theme, London School of Hygiene & Tropical Medicine - Vaccines and Immunity Theme, London School of Hygiene & Tropical Medicine - Vaccines and Immunity Theme, London School of Hygiene & Tropical Medicine - Vaccines and Immunity Theme, London School of Hygiene & Tropical Medicine, London School of Hygiene & Tropical Medicine - Centre for Mathematical Modelling of Infectious Diseases, London School of Hygiene & Tropical Medicine and University of Sheffield - Department of Infection, Immunity & Cardiovascular Disease