1. Centers for Disease Control and Prevention, Atlanta, GA
2. National Center for Immunization and Respiratory Diseases, CDC, Atlanta, GA
3. Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
4. Bureau of Communicable Disease, New York City Department of Health and Mental Hygiene, Long Island City, NY
5. Immunization Branch, California Department of Public Health, Richmond, CA
6. Chicago Department of Public Health, Chicago, IL
7. Meningitis and Vaccine Preventable Diseases Branch, Centers for Disease Control and Prevention, Atlanta, GA