1. Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, Tennessee, USA
2. National Veterinary Services Laboratories, Science, Technology and Analysis Services, Veterinary Services, Animal and Plant Health Inspection Service, U.S. Department of Agriculture, Ames, Iowa, USA
3. College of Medicine and Medical Research Institute, Chungbuk National University, Cheongju, South Korea
4. Animal and Plant Health Agency, New Haw, Addlestone, Surrey, United Kingdom
5. Influenza and Prion Disease Research Center, National Institute of Animal Health, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan
6. Department of Population Health, College of Veterinary Medicine, The University of Georgia, Athens, Georgia, USA