1. Centre for Vaccines & Immunology, National Institute for Communicable Diseases, Division of the National Health Laboratory Service
2. Department of Chemical Pathology, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand & National Health Laboratory Service
, Johannesburg,
South Africa;
3. Johns Hopkins University Centre for TB Research, Baltimore, Maryland; and
4. Perinatal Health Research Unit, DST/NRF Centre of Excellence for Biomedical TB Research, and Soweto Matlosana Collaborating Centre for HIV/AIDS and TB, University of the Witwatersrand, Johannesburg, South Africa