[1] Univ Washington, Int Clin Res Ctr, Dept Global Hlth, Seattle, WA 98195 USA
[2] Univ Washington, Dept Med, Div Allergy & Infect Dis, Seattle, WA USA
[3] Human Sci Res Council, Sweetwaters, South Africa
[4] Africa Hlth Res Inst, Mtubatuba, South Africa
[5] Univ Witwatersrand, Sch Clin Med, Fac Hlth Sci, Johannesburg, South Africa
[6] Univ Washington, Dept Epidemiol, Seattle, WA 98195 USA