1. WHO Collaborating Center for Influenza, Centers for Disease Control and Prevention (CDC), Atlanta, GA 30333, USA.
2. Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK.
3. Fogarty International Center, National Institutes of Health, Bethesda, MD 20892, USA.
4. Department of Virology, Erasmus Medical Center, 3000 CA Rotterdam, NL.
5. Instituto de Diagnóstico y Referencia Epidemiológicos (InDRE) Prolongación de Carpio, México, 11340 Mexico DF.
6. Naval Health Research Center, San Diego, CA 92152, USA.
7. Arizona State Public Health Laboratory, Phoeniz, AZ 85007, USA.
8. Colorado Department of Public Health and Environment, Denver, CO 80230, USA.
9. Indiana State Department of Health Laboratories, Indianapolis, IN 46202, USA.
10. Public Health Laboratory, Minnesota Department of Health, St. Paul, MN 55164, USA.
11. Nebraska Public Health Laboratory, Omaha, NE 68198, USA.
12. Westchester County Department of Laboratories & Research Public Health Laboratories, Valhalla, NY 10595,USA.
13. Wadsworth Center, New York State Department of Health, Slingerlands, NY 12159, USA.
14. Ohio Department of Health Laboratory, Reynoldsburg, OH 43068, Reynoldsburg, OH 43068, USA.
15. South Carolina Department of Health and Environmental Control, Columbia, SC 29223, USA.
16. Dallas County Health and Human Services, Dallas, TX 75207, USA.
17. San Antonio Metro Health District, Brooks City–Base, TX
78235, USA.
18. Diagnostic Virology Laboratory, Texas Children’s Hospital, Houston, TX 77030, USA.
19. San Diego Public Health Laboratory, San Diego, CA 92186, USA.
20. Imperial County Public Health Department, El Centro, CA 92243, USA.
21. CDC Border Infectious Disease Surveillance Project, Atlanta, GA 30333, USA.
22. William A. Hinton State Laboratory Institute, Massachusetts Department of Public Health, Jamaica Plain, MA 02130, USA.
23. California Department of Public Health, Viral and Rickettsial Disease Laboratory, Richmond, CA 94804, USA.
24. Marshfield Clinic Research Foundation, Marshfield, WI 54449, USA.
25. Michigan Department of Community Health, Lansing, MI 48906, USA.
26. Public Health Laboratory, NYC Department of Health and Mental Hygiene, New York, NY 10016, USA.