Selected adverse events reported after COVID-19 vaccination
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Selected adverse events reported after COVID-19 vaccination

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    • Description:
      Updated June 11, 2021

      Results from safety monitoring efforts are reassuring. Some people have no side effects. Many people have reported only mild side effects after COVID-19 vaccination.

      What you need to know

      • COVID-19 vaccines are safe and effective.

      • Millions of people in the United States have received COVID-19 vaccines under the most intense safety monitoring in U.S. history.

      • CDC recommends you get a COVID-19 vaccine as soon as you can.

      • Adverse events described on this page have been reported to the Vaccine Adverse Event Reporting System (VAERS)external icon.

      • VAERS accepts reports of any adverse event following vaccination, even if it is not clear the vaccine caused the problem.

      • After a temporary pause to investigate thrombosis with thrombocytopenia syndrome (TTS) following vaccination with Johnson & Johnson’s Janssen (J&J/Janssen) COVID-19 Vaccine, the data show that TTS is a rare adverse event. The known and potential benefits of the J&J/Janssen vaccine outweigh its known and potential risks.

      • CDC, the U.S. Food and Drug Administration (FDA), and other federal agencies will continue to monitor the safety of COVID-19 vaccines.

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