1. Respiratory Diseases Branch, National Center for Immunizations and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
2. California Emerging Infections Program, Oakland, CA, USA
3. Colorado Department of Public Health and Environment, Denver, CO, USA
4. Connecticut Department of Public Health, Hartford, CT, USA
5. Emory University School of Medicine, Atlanta, GA, USA
6. Atlanta VA Medical Center, Atlanta, GA, USA
7. Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
8. Minnesota Department of Health, St Paul, MN, USA
9. New Mexico Department of Health, Santa Fe, NM, USA
10. New York State Department of Health, Albany, NY, USA
11. Oregon Health Authority Public Health Division, Portland, OR, USA
12. Vanderbilt University School of Medicine, Nashville, TN, USA