1. Department of Science and Technology/National Research Foundation, Vaccine Preventable Diseases, University of the Witwatersrand, Johannesburg, South Africa2Medical Research Council, Respiratory and Meningeal Pathogens Research Unit, Chris Hani Baragwanath Hospital, University of the Witwatersrand, Johannesburg, South Africa
2. Medical Research Council, Respiratory and Meningeal Pathogens Research Unit, Chris Hani Baragwanath Hospital, University of the Witwatersrand, Johannesburg, South Africa3Department of Pediatrics, University of Colorado and Center for Global Health, Aurora
3. Departments of Pediatrics, Medicine, and Pathology, University of Colorado, Aurora
4. Department of Science and Technology/National Research Foundation, Vaccine Preventable Diseases, University of the Witwatersrand, Johannesburg, South Africa2Medical Research Council, Respiratory and Meningeal Pathogens Research Unit, Chris Hani Baragwanath Hospital, University of the Witwatersrand, Johannesburg, South Africa5National Institute for Communicable Diseases, Division of National Health Laboratory Service, Centre for Vaccines and Immunology, Johannesburg, South Africa