What would happen if a vaccine turned out to have serious side effects?

Science shows that generally the most serious side effects occur within six weeks of vaccine administration. The current available COVID-19 vaccines have been studied for longer than six weeks, and the companies have not identified or reported serious safety concerns.

To date, the independent safety monitoring board overseeing Phase 3 trials of the Pfizer and Moderna vaccines has not found any serious safety concerns. The FDA reviews all research before authorizing any vaccine for use.  The FDA and CDC will continue to closely monitor vaccine safety as the public begins using a new vaccine. If safety monitoring reveals new information about vaccine risks, such as new serious side effects, new guidelines may be issued or a vaccine may be removed from the market. Learn more about the vaccine safety monitoring systems.  

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