[1] UCL, Sch Med, Dept Infect, Div Infect & Immun, London W1N 8AA, England
[2] WHO, STOP TB Dept, Geneva, Switzerland
[3] NIAID, TB Clin Res Branch, Div Aids, NIH, Bethesda, MD 20892 USA
[4] Geisel Sch Med Dartmouth, Sect Infect Dis & Int Hlth, Hanover, NH USA