1. Centre for Respiratory Diseases and Meningitis, National Institute for Communicable Diseases, National Health Laboratory Service, Johannesburg, South Africa
2. School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
3. Influenza Division, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
4. Influenza Program, Centers for Disease Control and Prevention, Pretoria, South Africa
5. School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
6. Department of Zoology, University of Oxford, Oxford, United Kingdom
7. Department of Medical Microbiology, Tshwane Academic Hospital, National Health Laboratory Service, Pretoria, South Africa
8. Department of Clinical Microbiology and Infectious Diseases, Chris Hani Baragwanath Academic Hospital, National Health Laboratory Service and University of the Witwatersrand, Johannesburg, South Africa
9. Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom
10. Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre, Malawi
11. Streptococcus Laboratory, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
12. Emory Global Health Institute, Emory University, Atlanta, Georgia, USA
13. Pathogen Genomics, Wellcome Trust Sanger Institute, Hinxton, United Kingdom
14. Hubert Department of Global Health, Rollins School of Public Health, and Division of Infectious Diseases, School of Medicine, Emory University, Atlanta, Georgia, USA