1. Department of Microbiology and Immunology, The University of Melbourne, Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria 3000, Australia.
2. MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, OX3 9DS Oxford, UK.
3. WHO Collaborating Centre for Reference and Research on Influenza, Victorian Infectious Diseases Reference Laboratory, Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria 3000, Australia.
4. HKU-Pasteur Research Pole, School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China.
5. Division of Public Health Laboratory Sciences, School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China.
6. Centre for Immunology & Infection, Hong Kong Science Park, Hong Kong SAR, China.
7. Centre for Translational Immunology, Chinese Academy of Medical Sciences, Oxford Institute, University of Oxford, OX3 7FZ Oxford, UK.