[1] Univ Tokyo, Inst Med Sci, Dept Microbiol & Immunol, Div Virol,Minato Ku, Tokyo 1088639, Japan
[2] Kagoshima Univ, Joint Fac Vet Med, Lab Anim Hyg, Kagoshima 8900065, Japan
[3] Kagoshima Univ, Joint Fac Vet Med, Transboundary Anim Distance Ctr, Kagoshima 8900065, Japan
[4] Natl Inst Anim Hlth, Influenza & Prion Dis Res Ctr, Tsukuba, Ibaraki 3050856, Japan
[5] Osaka Prefectural Inst Publ Hlth, Dept Infect Dis, Osaka 5370025, Japan
[6] Keiyu Hosp, Dept Pediat, Yokohama, Kanagawa 2200012, Japan
[7] Natl Inst Infect Dis, Influenza Virus Res Ctr, Tokyo 2080011, Japan
[8] Japan Sci & Technol Agcy, ERATO Infect Induced Host Responses Project, Kawaguchi, Saitama 3320012, Japan
[9] Univ Tokyo, Inst Med Sci, Int Res Ctr Infect Dis, Dept Special Pathogens,Minato Ku, Tokyo 1088639, Japan
[10] Univ Wisconsin, Sch Vet Med, Dept Pathobiol Sci, Madison, WI 53711 USA
[11] Kyoto Univ, Inst Virus Res, Dept Biol Responses, Lab Bioresponses Regulat, Kyoto 6068507, Japan