1. Division of Virology; Department of Microbiology and Immunology; Institute of Medical Science; University of Tokyo; Minato-ku Tokyo 108-8639
2. Laboratory of Animal Hygiene; Joint Faculty of Veterinary Medicine
3. Transboundary Animal Distance Center; Joint Faculty of Veterinary Medicine; Kagoshima University; Kagoshima Kagoshima 890-0065
4. Influenza and Prion Disease Research Center; National Institute of Animal Health; Kannondai 3-1-5 Tsukuba Ibaraki 305-0856
5. Department of Infectious Diseases; Osaka Prefectural Institute of Public Health; Osaka Osaka 537-0025
6. Department of Pediatrics; Keiyu Hospital; Yokohama 220-0012
7. Influenza Virus Research Center; National Institute of Infectious Diseases; Musashimurayama Tokyo 208-0011
8. ERATO Infection-Induced Host Responses Project; Japan Science and Technology Agency; Saitama Saitama 332-0012
9. Department of Special Pathogens; International Research Center for Infectious Diseases; Institute of Medical Science; University of Tokyo; Minato-ku Tokyo 108-8639
10. Department of Pathobiological Sciences; School of Veterinary Medicine; University of Wisconsin-Madison; Science Drive Madison WI 53711 USA
11. Laboratory of Bioresponses Regulation; Department of Biological Responses; Institute for Virus Research; Kyoto University; Kyoto Kyoto 606-8507 Japan