1. Influenza Division Centers for Disease Control and Prevention Atlanta GA USA
2. Influenza Program Centers for Disease Control and Prevention Pretoria South Africa
3. Centre for Respiratory Diseases and Meningitis National Institute for Communicable Diseases of the National Health Laboratory Service Johannesburg South Africa
4. MassGenics Duluth GA USA
5. School of Public Health, Faculty of Health Sciences University of the Witwatersrand Johannesburg South Africa
6. Global Immunization Monitoring and Surveillance Team, Expanded Programme on Immunization, Department of Immunization, Vaccines and Biological World Health Organization Geneva Switzerland
7. Division of Virology, National Health Laboratory Service Charlotte Maxeke Johannesburg Academic Hospital Johannesburg South Africa
8. School of Pathology, Faculty of Health Sciences University of the Witwatersrand Johannesburg South Africa
9. Department of Medicine Pietermaritzburg Metropolitan Hospital Pietermaritzburg South Africa
10. Department of Medicine University of KwaZulu‐Natal Pietermaritzburg South Africa
11. Department of Medicine Klerksdorp‐Tshepong Hospital Complex Klerksdorp South Africa
12. Department of Medicine, Faculty of Health Sciences University of the Witwatersrand Johannesburg South Africa
13. Perinatal HIV Research Unit University of the Witwatersrand Johannesburg South Africa