Government of the United States of America - Division of Influenza, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, Government of the United States of America - Division of Influenza, Government of the United States of America - National Center for Immunization and Respiratory Diseases, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, Pietermaritzburg Metropolitan Hospital - Department of Medicine, Klerksdorp-Tshepong Hospital Complex - Department of Medicine, University of the Witwatersrand - Vaccines and Infectious Diseases Analytics Research Unit and National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis