1. Centre for Vaccines and Immunology; National Institute for Communicable Diseases (NICD); Johannesburg South Africa
2. Faculty of Health Sciences; Division of Virology and Communicable Diseases Surveillance; School of Pathology; University of the Witwatersrand; Johannesburg South Africa
3. Division of Epidemiology and Biostatistics; School of Public Health; University of the Witwatersrand; Johannesburg South Africa
4. Division of Medical Virology; University of Cape Town and National Health Laboratory Services; Cape Town South Africa
5. Donation Testing; South African National Blood Service; Roodepoort South Africa
6. Molecular Medicine and Haematology; School of Pathology; Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
7. Centre for HIV and STI; National Institute for Communicable Diseases (NICD); Johannesburg South Africa