We thank the GISAID Initiative and the GISRS Network for critical surveillance efforts and open data sharing. Titer data used in antigenic analyses was generated by the Influenza Division at the US Centers for Disease Control and Prevention, the Worldwide Influenza Centre at the Francis Crick Institute, the Victorian Infectious Diseases Reference Laboratory at the Australian Peter Doherty Institute for Infection and Immunity and the Influenza Virus Research Center at the Japan National Institute of Infectious Diseases. We gratefully acknowledge the authors, originating and submitting laboratories of sequences from the GISAID EpiFlu Database on which this research is based. An attribution table is available by clicking on "Download Data" at the bottom of the page and then clicking on "Acknowledgments" in the resulting dialog box.
Special thanks to Jackie Katz, Dave Wentworth, Becky Kondor, Vivien Dugan, Xiyan Xu, Elizabeth Neuhaus, Sujatha Seenu, John McCauley, Rod Daniels, Vicki Gregory, Kanta Subbarao, Ian Barr, Aeron Hurt, Takato Odagiri, Shinji Watanabe, Tomoko Kuwahara, Michael Lässig, Marta Łuksza, Richard Reeve, Colin Russell, Sebastian Maurer-Stroh and Peter Bogner for feedback and advice. This analysis represents an updated frontend to the Nextflu informatic pipeline, originally available at nextflu.org.