1. Communicable Disease Control Directorate, WA Health, Perth, WA.
2. Department of Microbiology and Laboratory Medicine, University of Western Australia, Perth, WA.
3. Epidemiology Unit, Victorian Infectious Diseases Reference Laboratory, Melbourne, VIC.
4. WHO Collaborating Centre for Reference and Research on Influenza, Melbourne, VIC.
5. Department of Microbiology, PathWest Laboratory Medicine WA, Perth, WA.