1. National Health Laboratory Services (NHLS); National Institute for Communicable Diseases (NICD); Johannesburg South Africa
2. Influenza Division; U.S. Centers for Disease Control and Prevention; Atlanta GA USA
3. Influenza Program; U.S. Centers for Disease Control and Prevention; Pretoria South Africa
4. Faculty of Health Sciences; Medical Research Council: Respiratory and Meningeal Pathogens Research Unit; University of the Witwatersrand; Johannesburg South Africa
5. Division of Medical Virology; Clinical Laboratory Sciences; University of Cape Town; Cape Town South Africa