1. Department of Pediatrics, Emory University School of Medicine , Atlanta, Georgia , USA
2. Center for Childhood Infections and Vaccines, Children’s Healthcare of Atlanta and Emory University , Atlanta, Georgia , USA
3. Influenza Division, Centers for Disease Control and Prevention , Atlanta, Georgia , USA
4. Abt Associates , Rockville, Maryland , USA
5. Epidemic Intelligence Service, Centers for Disease Control and Prevention , Atlanta, Georgia , USA
6. Georgia Emerging Infections Program, Georgia Department of Public Health , Atlanta, Georgia , USA
7. Veterans Affairs Medical Center , Decatur, Georgia , USA
8. California Emerging Infections Program , Oakland, California , USA
9. Field Services Branch, Division of State and Local Readiness, Center for Preparedness and Response, Centers for Disease Control and Prevention , Atlanta, Georgia , USA
10. Colorado Department of Public Health and Environment , Denver, Colorado , USA
11. Connecticut Emerging Infections Program, Yale School of Public Health , New Haven, Connecticut , USA
12. Maryland Department of Health , Baltimore, Maryland , USA
13. Michigan Department of Health and Human Services , Lansing, Michigan , USA
14. Minnesota Department of Health , St Paul, Minnesota , USA
15. New Mexico Department of Health , Santa Fe, New Mexico , USA
16. New York State Department of Health , Albany, New York , USA
17. New York State Emerging Infections Program, Center for Community Health and Prevention, University of Rochester School of Medicine and Dentistry , Rochester, New York , USA
18. Ohio Department of Health , Columbus, Ohio , USA
19. Oregon Health Authority , Portland, Oregon , USA
20. Vanderbilt University School of Medicine , Nashville, Tennessee , USA
21. Salt Lake County Health Department , Salt Lake City, Utah , USA
22. Department of Medicine, Emory University School of Medicine , Atlanta, Georgia , USA