1. Epidemic Intelligence Service, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention (CDC), Atlanta, Georgia, USA.
2. National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
3. Department of Family and Community Medicine, University of California San Francisco School of Medicine, San Francisco, California, USA.
4. California Emerging Infections Program, Oakland, California, USA.
5. Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
6. Department of Health Policy, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
7. Connecticut Emerging Infections Program, Yale School of Public Health, New Haven, Connecticut, USA.
8. Oregon Department of Human Services, Portland, Oregon, USA.
9. Center for Community Health and Prevention, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA.
10. National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.