1. Influenza Division, Centers for Disease Control and Prevention , Atlanta, Georgia , USA
2. Epidemic Intelligence Service, Centers for Disease Control and Prevention , Atlanta, Georgia , USA
3. Coronavirus and Other Respiratory Viruses Division, Centers for Disease Control and Prevention , Atlanta, Georgia , USA
4. California Emerging Infections Program , Oakland, California , USA
5. Centers for Disease Control and Prevention , Atlanta, Georgia , USA
6. Colorado Department of Public Health and Environment , Denver, Colorado , USA
7. Connecticut Emerging Infections Program , New Haven, Connecticut , USA
8. Yale School of Public Health , New Haven, Connecticut , USA
9. School of Medicine, Emory University , Atlanta, Georgia , USA
10. Georgia Emerging Infections Program, Georgia Department of Public Health , Atlanta, Georgia , USA
11. Atlanta Veterans Affairs Medical Center , Decatur, Georgia , USA
12. Michigan Department of Health and Human Services , Lansing, Michigan , USA
13. Minnesota Department of Health , Saint Paul, Minnesota , USA
14. New Mexico Department of Health , Albuquerque, New Mexico , USA
15. New York State Department of Health , Albany, New York , USA
16. School of Medicine and Dentistry, University of Rochester , Rochester, New York , USA
17. Ohio Department of Health , Columbus, Ohio , USA
18. Public Health Division, Oregon Health Authority , Portland, Oregon , USA
19. Vanderbilt University Medical Center , Nashville, Tennessee , USA
20. Salt Lake County Health Department , Salt Lake City, Utah , USA