1. Institute of Infectious Diseases and Molecular Medicine, University of Cape Town, Cape Town, South Africa
2. Desmond Tutu Human Immunodeficiency Virus Centre, University of Cape Town, Cape Town, South Africa
3. Division of Epidemiology and Biostatistics, School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa
4. Department of Pathology & Laboratory Medicine, Emory University School of Medicine, Atlanta, USA
5. Division of Microbiology and Immunology, Yerkes National Primate Research Center, Atlanta, USA
6. Seattle Children’s Research Institute, Seattle, Washington, USA
7. University of Washington Department of Pediatrics and Global Health, Seattle, Washington, USA
8. National Health Laboratory Service, Cape Town, South Africa