1. School of Paediatrics and Child Health, University of Western Australia, Princess Margaret Hospital, Subiaco, Western Australia, Australia
2. Centre for Infectious Diseases and Microbiology Laboratory Services, Institute of Clinical Pathology and Medical Research (ICPMR), Westmead Hospital, Westmead, New South Wales, Australia
3. World Health Organisation Collaborating Centre for Reference and Research on Influenza, Victorian Infectious Diseases Reference Laboratory (VIDRL), North Melbourne, Victoria, Australia
4. Victorian Infectious Diseases Reference Laboratory, North Melbourne, Victoria, Australia
5. Pathwest Laboratory Medicine, Queen Elizabeth II Medical Centre, Nedlands, Western Australia, Australia
6. World Health Organisation National Influenza Centre, Institute of Environmental Science and Research, Wellington, New Zealand
7. National Institute for Communicable Diseases, Sandringham, Johannesburg, South Africa