![]() Pure (Certain ingredients used during production have been removed).Potent (It works like it’s supposed to).The company that makes the vaccine tests batches to make sure the vaccine is: Once a vaccine is approved or authorized, it continues to be tested. Every batch of vaccines is tested for quality and safety All safety concerns must be addressed before FDA licenses or authorizes a vaccine. Throughout the process, FDA works closely with the company producing the vaccine to evaluate the vaccine’s safety and effectiveness. How does the immune system react to it?.These tests can take several years and answer important questions like: Clinical trials usually start with 20 to 100 volunteers, but eventually include thousands of volunteers. FDA uses the information from these tests to decide whether to test the vaccine with people.ĭuring a clinical trial, a vaccine is tested on people who volunteer to get vaccinated. Vaccines are tested before they’re recommended for useīefore a vaccine is ever recommended for use, it’s tested in labs. ![]() Monitoring the vaccine’s safety after it is recommended for infants, children, or adults.Testing and evaluation of the vaccine before it’s licensed by the Food and Drug Administration (FDA) and recommended for use by the Centers for Disease Control and Prevention (CDC).How are vaccines tested for safety?Įvery authorized or approved vaccine goes through safety testing, including: In this section, you’ll learn more about vaccine safety-and get answers to common questions about vaccine side effects. Because vaccines are given to millions of healthy people-including children-to prevent serious diseases, they’re held to very high safety standards. In the United States, a number of safeguards are required by law to help ensure that the vaccines we receive are safe.
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