[1] Univ Utrecht, Fac Vet Med, Dept Infect Dis & Immunol, Div Virol, Utrecht, Netherlands
[2] Loyola Univ, Med Ctr, Dept Microbiol & Immunol, Maywood, IL 60153 USA
[3] Univ N Carolina, Dept Epidemiol, Chapel Hill, NC USA
[4] WHO, WHO Reg Off Europe, Copenhagen, Denmark
[5] Univ Bonn, Med Ctr, Inst Virol, Bonn, Germany
[6] Campus Univ Autonoma Madrid, Natl Ctr Biotechnol CNB CSIC, Dept Mol & Cell Biol, Madrid, Spain
[7] Erasmus MC, Virosci Lab, Rotterdam, Netherlands
[8] Publ Hlth England, Hlth Protect Agcy, London, England
[9] Leiden Univ, Med Ctr, Dept Med Microbiol, Leiden, Netherlands
[10] Minist Hlth, Publ Hlth Directorate, Riyadh, Saudi Arabia
[11] Univ Iowa, Dept Microbiol, Iowa City, IA 52242 USA
[12] Univ Hong Kong, Influenza Res Ctr, Hong Kong, Hong Kong, Peoples R China
[13] Univ Hong Kong, Sch Publ Hlth, Hong Kong, Hong Kong, Peoples R China
[14] Univ Hong Kong, Dept Microbiol, Hong Kong, Hong Kong, Peoples R China
[15] Ain Shams Univ, Fac Med, Cairo, Egypt
[16] Univ Giessen, Inst Med Virol, D-35390 Giessen, Germany