1. Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis
2. Department of Immunology, St. Jude Children’s Research Hospital, Memphis
3. Integrated Biomedical Sciences Program, University of Tennessee Health Science Center, Memphis
4. Institute for Environmental Science and Research, National Centre for Biosecurity and Infectious Disease–Wallaceville, Upper Hutt
5. Immunisation Advisory Service, Department of Population Health, University of Auckland, New Zealand
6. Influenza Division, Centers for Disease Control and Prevention, Atlanta, Georgia