National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, Government of the United States of America - Division of Influenza, Division of Public Health Surveillance and Response, National Institute for Communicable Disease of the National Health Laboratory Service, South Africa Medical Research Council (SAMRC) Centre for Health Economics and Decision Science- PRICELESS SA, School of Public Health, University of the Witwatersrand, National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, Government of the United States of America - Centers for Disease Control and Prevention (CDC), National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, Western Cape Government: Health, Health Impact Assessment Directorate, University of Cape Town (UCT), Stellenbosch University - Division of Infectious Diseases, Mitchells Plain District Hospital, Khayelitsha District Hospital, Western Cape Department of Health, National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, Department of Medicine, Charlotte Maxeke Johannesburg Academic Hospital and the University of the Witwatersrand, Walter Sisulu University - Department of Medicine, Department of Medicine, Klerksdorp-Tshepong Hospital and the University of Witwatersrand, Stellenbosch University - Department of Medicine, Free State Department of Health, Pietermaritzburg Metropolitan Hospital - Department of Medicine, Limpopo Department of Health, Northern Cape Department of Health, Gauteng Department of Health, Mpumalanga Department of Health, KwaZulu-Natal Department of Health, Eastern Cape Department of Health, affiliation not provided to SSRN and National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases