[1] Univ Oxford, Clin Res Unit, Ho Chi Minh City, Vietnam
[2] Wellcome Collaborat Res Program, KEMRI, Kilifi, Kenya
[3] Mahidol Univ, Fac Trop Med, Bangkok, Thailand
[4] Churchill Hosp, Ctr Clin Vaccinol & Trop Med, Oxford OX3 7LJ, England
[5] Ctr Genom & Global Hlth, Oxford, England