1. Division of Health Sciences and Nutrition, Commonwealth Scientific and Industrial Research Organisation, Parkville
2. GlaxoSmithKline Research and Development, Greenford
3. World Health Organization Collaborating Centre for Reference & Research on Influenza, Melbourne, Australia
4. World Health Organization Collaborating Center for Reference & Research on Influenza, London
5. World Health Organization Collaborating Center for Surveillance, Epidemiology and Control of Influenza, Atlanta, Georgia
6. World Health Organization Collaborating Center for Reference & Research on Influenza, Tokyo, Japan
7. University of Virginia Health Science Center, Charlottesville, Virginia
8. Public Health Laboratory Service, London, United Kingdom