The authors are with the Desmond Tutu Tuberculosis Centre, Department of Paediatrics and Child Health, Faculty of Health Sciences, Stellenbosch University, Cape Town, South Africa. H. Simon Schaaf, Ben J. Marais, and Peter R. Donald are also with Tygerberg Children's Hospital, Cape Town. Anneke C. Hesseling is also with the Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, England.