[1] NIAID, Lab Immunoregulat, NIH, Baltimore, MD USA
[2] Johns Hopkins Sch Med, Dept Med, Baltimore, MD USA
[3] Univ Cape Town, Div Epidemiol & Biostat, Cape Town, South Africa
[4] Columbia Univ, Mailman Sch Publ Hlth, ICAP, New York, NY USA
[5] Univ Cape Town, Dept Pathol, Div Med Virol, Cape Town, South Africa
[6] Groote Schuur Hosp, Natl Hlth Lab Serv, Cape Town, South Africa
[7] Johns Hopkins Sch Med, Dept Pathol, Baltimore, MD USA
[8] Rakai Hlth Sci Program, Kalisizo, Uganda
[9] Columbia Univ, Vagelos Coll Phys & Surg, New York, NY USA
[10] Univ Cape Town, Sch Publ Hlth & Family Med, Ctr Infect Dis Epidemiol & Res, Cape Town, South Africa