Vaccine Education Center
The Vaccine Education Center at Children’s Hospital of Philadelphia provides complete, up-to-date and reliable information about vaccines across the lifespan. We are a member of the World Health Organization's (WHO) Vaccine Safety Net because our website meets the criteria for credibility and content as defined by the Global Advisory Committee on Vaccine Safety. Learn more about the WHO’s Vaccine Safety Net.
Looking for measles resources?
June/July 2025: Thimerosal in Multidose Vaccine Vials: Then and Now
Dr. Paul Offit talks about the history of thimerosal in vaccines. You’ll also find resources related to COVID-19 vaccines, measles outbreaks, and the June ACIP meeting.
Vaccines and Diseases
Learn about vaccines and the diseases they prevent.
Vaccine Safety
Find info about vaccine ingredients, conditions discussed in relation to vaccines, and other common vaccine safety concerns.
Vaccine Schedule
See when vaccines are recommended across the lifespan, considerations for specific populations, and answers to other schedule-related questions.
Vaccine Science & History
Get info about vaccine development and licensure, history, and global vaccine considerations.
Human Immune System
Review info about the types of immunity, how the immune system develops and works, what happens when it doesn’t work properly, and more.
About the Vaccine Education Center
Learn about the Vaccine Education Center, our programs, and our team.
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