Affiliation: | 1. Medical Research Council Unit, Fajara, The Gambia;2. Microbiology and Infection Unit, University of Warwick, Coventry, UK;3. Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK;4. Murdoch Children's Research Institute, Melbourne, Vic., Australia;5. Tropical Epidemiology Group, London School of Hygiene and Tropical Medicine, London, UK |