Affiliation: | (1) MRC Laboratories Gambia, PO Box 273, Banjul, Gambia;(2) Malawi-Liverpool-Wellcome Trust Clinical Research Programme, PO Box 30096, Chichiri, Blantyre 3, Malawi;(3) Immunisation Department, Health Protection Agency Centre for Infections, London, UK;(4) Department of Pediatrics, Bronx Lebanon Hospital Center, 1650 Selwyn Avenue, Bronx, New York, USA;(5) Epidemiology and Surveillance Unit, Centre for Infectious Diseases Control, National Institute for Public Health and the Environment, Bilthoven, The Netherlands;(6) Julius Centre, University Medical Centre Utrecht, Utrecht, The Netherlands;(7) MRC Epidemiology Resource Centre, University of Southampton, Southampton General Hospital, Southampton, UK |