1. Department of Infectious Diseases, Imperial College London, London, United Kingdom
2. Avian Influenza Group, The Pirbright Institute, Woking, United Kingdom
3. Royal Veterinary College, University of London, London, United Kingdom
4. Boyd Orr Centre for Population and Ecosystem Health, Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, United Kingdom
5. The Francis Crick Institute, London, United Kingdom