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National Immunization Program
This website has information about immunizations. Call: (800) 232-2522
CDC: Flu (Influenza)
The CDC's site has up-to-date information on flu outbreaks, immunizations, symptoms, prevention, and more.
The History of Vaccines
The History of Vaccines is an informational, educational website created by The College of Physicians of Philadelphia, the oldest professional society in the United States.