The United States' long-standing vaccine safety program closely and constantly monitors the safety of vaccines.
A critical part of the program, CDC's Immunization Safety Office identifies possible vaccine side effects and conducts studies to determine whether health problems are caused by vaccines.
Data show that the current U.S. vaccine supply is the safest in history.
- Page last reviewed: November 2, 2015
- Page last updated: November 2, 2015
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