[1] London Sch Hyg & Trop Med, Maternal Adolescent Reprod & Child Hlth Ctr, Keppel St, London WC1E 7HT, England
[2] Kings Coll London, London, England
[3] Haramaya Univ, Coll Hlth & Med Sci, Dire Dawa, Ethiopia
[4] Imperial Coll London, Ctr Int Child Hlth, London, England
[5] St Georges Univ London, Paediat Infect Dis Res Grp, London, England
[6] Hosp Clin Corpas, Bogota, Colombia
[7] Baylor Coll Med, Dept Pediat, Houston, TX 77030 USA
[8] Baylor Coll Med, Dept Mol Virol, Houston, TX 77030 USA
[9] Baylor Coll Med, Dept Microbiol, Houston, TX 77030 USA
[10] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Int Hlth, Baltimore, MD USA
[11] Univ Witwatersrand, Fac Hlth Sci, MRC, Resp & Meningeal Pathogens Res Unit, Johannesburg, South Africa
[12] Univ Witwatersrand, Fac Hlth Sci, Natl Res Fdn Vaccine Preventable Dis, Dept Sci & Technol, Johannesburg, South Africa
[13] Univ Washington, Global Alliance Prevent Prematur & Stillbirth, Seattle, WA 98195 USA
[14] Univ Washington, Dept Obstet & Gynecol, Seattle, WA 98195 USA
[15] Natl Hlth Lab Serv, Natl Inst Communicable Dis, Johannesburg, South Africa
[16] Univ Washington, Dept Global Hlth, Seattle, WA 98195 USA
[17] Ctr Dis Control & Prevent, Natl Ctr Immunizat & Resp Dis, Atlanta, GA USA
[18] Bill & Melinda Gates Fdn, Seattle, WA USA
[19] WHO, Geneva, Switzerland
[20] Inst Child Hlth, Dhaka, Bangladesh
[21] Chinese Univ Hong Kong, Fac Med, Dept Microbiol, Hong Kong, Hong Kong, Peoples R China