Harvard University - Center for Communicable Disease Dynamics, Harvard University - Center for Communicable Disease Dynamics, Harvard University - Center for Communicable Disease Dynamics, Harvard University - Center for Communicable Disease Dynamics, National Institute For Communicable Diseases Of South Africa - Division of Public Health Surveillance and Response, National Institute For Communicable Diseases Of South Africa - Division of Public Health Surveillance and Response, National Institute For Communicable Diseases Of South Africa - Division of Public Health Surveillance and Response, National Institute For Communicable Diseases Of South Africa - Division of Public Health Surveillance and Response, National Institute For Communicable Diseases Of South Africa - Division of Public Health Surveillance and Response, National Institute For Communicable Diseases Of South Africa - Division of Public Health Surveillance and Response, National Institute For Communicable Diseases Of South Africa - Division of Public Health Surveillance and Response, Harvard T.H. Chan School of Public Health - Center for Communicable Disease Dynamics, Harvard University - Center for Communicable Disease Dynamics, National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis and Harvard University - Center for Communicable Disease Dynamics

National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, Government of the United States of America - Division of Influenza, National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, Centre for Respiratory Disease and Meningitis, National Institute for Communicable Diseases, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, Division of Public Health Surveillance and Response, National Health Laboratory Services (NHLS), National Cancer Registry, National Health Laboratory Services (NHLS), National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, Division of Public Health Surveillance and Response, National Health Laboratory Services (NHLS), National Institute For Communicable Diseases Of South Africa - Division of Public Health Surveillance and Response, Centre for Emerging, Zoonotic and Parasitic Diseases, National Institute for Communicable Diseases, Clinton Health Access Initiative (CHAI), South African Government - National Department of Health, National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, Clinton Health Access Initiative (CHAI), National Health Laboratory Services (NHLS), National Health Laboratory Services (NHLS), National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, University of the Witwatersrand - National Institute for Communicable Diseases and Independent

National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, University of the Witwatersrand - Department of Clinical Microbiology and Infectious Diseases, University of Cape Town (UCT) - Department of Pediatrics and Child Health, affiliation not provided to SSRN, Government of the United States of America - Division of Influenza, National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, National Institute For Communicable Diseases Of South Africa - Division of Public Health Surveillance and Response, Division of Public Health Surveillance and Response, National Health Laboratory Services (NHLS), National Institute For Communicable Diseases Of South Africa - Division of Public Health Surveillance and Response, National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases and National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis