[1] Univ Cape Town, Inst Infect Dis & Mol Med, Desmond Tutu HIV Ctr, ZA-7925 Cape Town, South Africa
[2] Univ Cape Town, Dept Med, ZA-7925 Cape Town, South Africa
[3] Univ Stellenbosch, Div Med Microbiol, Cape Town, South Africa
[4] Tygerberg Hosp, Natl Hlth Lab Serv, Cape Town, South Africa
[5] Columbia Univ, Dept Epidemiol, Mailman Sch Publ Hlth, New York, NY USA
[6] Rutgers State Univ, New Jersey Med Sch, Publ Hlth Res Inst, TB Ctr, Newark, NJ 07102 USA