1. Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia2Pennsylvania Department of Health, Harrisburg
2. Allegheny County Health Department, Pittsburgh, Pennsylvania
3. Maryland Department of Health and Mental Hygiene, Baltimore
4. Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia4Maryland Department of Health and Mental Hygiene, Baltimore
5. Respiratory Diseases Branch, Centers for Disease Control and Prevention, Atlanta, Georgia
6. Pennsylvania Department of Health, Harrisburg
7. Division of Healthcare Quality and Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia