[1] Wellcome Trust Sanger Inst, Cambridge CB10 15A, England
[2] Univ Bath, Dept Biol & Biochem, Bath BA2 7AY, Avon, England
[3] Mahidol Univ, Fac Trop Med, Bangkok, Thailand
[4] Univ Cambridge, Addenbrookes Hosp, Dept Med, Cambridge CB2 0QQ, England
[5] Univ Nova Lisboa, Inst Tecnol Quim & Biol, Mol Genet Lab, P-2780156 Oeiras, Portugal
[6] Rockefeller Univ, Microbiol Lab, New York, NY 10065 USA
[7] Univ Oxford, Nuffield Dept Clin Med, Ctr Clin Vaccinol & Trop Med, Oxford OX3 7LJ, England
[8] Univ London, Dept Cellular & Mol Med, Ctr Infect, London SW17 0RE, England
[9] Guys Hosp, Guys Kings & St Thomas Med Sch, Kings Coll London, Dept Infect Dis, London SE1 9RT, England
[10] Guys & St Thomas Natl Hlth Serv Fdn Trust, Directorate Infect, London SE1 7EH, England