Vaccine Education Center
The Vaccine Education Center at Children's Hospital of Philadelphia provides complete, up-to-date and reliable information about vaccines to parents and healthcare professionals. 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.
Check out our description of vaccine developments by year and decade, and find out when different vaccines were first available.
A Look at Each Vaccine
Find details about vaccine-preventable diseases and the vaccines that protect against them, including disease symptoms, vaccine risks & benefits, and more.
Human Immune System
Learn about the types of immunity, how the immune system develops, how it works, and what happens when it doesn’t work properly.
Learn about the different types of vaccine ingredients, including antigens, adjuvants, stabilizers, preservatives, and manufacturing byproducts.
Age Groups and Vaccines
See what vaccines are recommended for certain age groups, and find tips on how to prepare yourself and other family members, during and after vaccinations.