[1] KEMRI Ctr Geog Med Res Coast, Kilifi, Kenya
[2] Univ Oxford, Dept Paediat, Oxford, England
[3] Univ Oxford, Nuffield Dept Med, Oxford, England
[4] INDEPTH Network Demog Surveillance Sites, Accra, Ghana
[5] EVIMaIR Network, Glasgow, Lanark, Scotland
[6] Michigan State Univ, Dept Pediat & Human Dev, Div Pediat Infect Dis, E Lansing, MI 48824 USA
[7] Natl Hosp, Abuja, Nigeria