[1] WHO Collaborating Ctr Reference & Res Influenza, Victorian Infect Dis Reference Lab, Melbourne, Vic, Australia
[2] Univ Cambridge, Cambridge CB2 1TN, England
[3] WHO Global Influenza Programme GIP, Geneva, Switzerland
[4] Ctr Dis Control & Prevent, WHO Collaborating Ctr Surveillance Epidemiol & Co, Atlanta, GA USA
[5] Natl Inst Med Res, MRC, WHO Collaborating Ctr Reference & Res Influenza, London NW7 1AA, England
[6] Hlth Protect Agcy, Natl Inst Biol Stand & Control, Potters Bar, Herts, England
[7] Therapeut Goods Adm, Canberra, ACT, Australia
[8] Natl Inst Infect Dis, WHO Collaborating Ctr Reference & Res Influenza, Tokyo, Japan
[9] St Jude Childrens Res Hosp, Memphis, TN 38105 USA
[10] Chinese Natl Influenza Ctr, WHO Collaborating Ctr Reference & Res Influenza, Beijing, Peoples R China
[11] Univ Cambridge, Ctr Pathogen Evolut, Cambridge CB2 1TN, England
[12] Univ Cambridge, WHOCC Modelling Evolut & Control Emerging Infect, Cambridge CB2 1TN, England
[13] NIH, Fogarty Int Ctr, Bethesda, MD USA
[14] US FDA, Ctr Biol Evaluat & Res, Bethesda, MD USA