1. Department of Molecular Medicine and Haematology, Faculty of Health Sciences; University of the Witwatersrand, and National Health Laboratory Service and National Priority Program of the National Health Laboratory Service; Johannesburg South Africa
2. Department of Molecular Medicine and Haematology, Faculty of Health Sciences; University of the Witwatersrand, Johannesburg; Gauteng South Africa
3. Lung Infection and Immunity Unit, Division of Pulmonology and UCT Lung Institute, Department of Medicine; University of Cape Town; Cape Town South Africa