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