1. Department of Viroscience, Erasmus Medical Center, 3015GE, Rotterdam, Netherlands.
2. Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53711, USA.
3. Veterinary and Biomedical Sciences, University of Minnesota, St. Paul, MN 55108, USA.
4. Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA 30322, USA.
5. Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
6. Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
7. State Key Laboratory of Emerging Infectious Diseases, School of Public Health, The University of Hong Kong, Hong Kong SAR.
8. Department of Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA.
9. Centre of Influenza Research, School of Public Health, The University of Hong Kong, Hong Kong SAR.
10. Department of Veterinary Medicine, University of Maryland, College Park, College Park, MD 20742, USA.
11. College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA.
12. Department of Zoology, University of Cambridge, Cambridge, CB2 3EJ, UK.
13. Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA.
14. Department of Microbiology and Immunology, Center for Vaccine Biology and Immunology, University of Rochester Medical Center, Rochester, NY 14642, USA.
15. Infectious Diseases Division, University of Rochester Medical Center, Rochester, NY 14642, USA.