COVID-19: Selected Adverse Events Reported after COVID-19 Vaccination: Updated Aug. 17, 2021
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COVID-19: Selected Adverse Events Reported after COVID-19 Vaccination: Updated Aug. 17, 2021

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    Updated Aug. 17, 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.

  • Content Notes:
    Accessed on 2024-07-15 at https://web.archive.org/web/20210820234732/https://www.cdc.gov/coronavirus/2019-ncov/vaccines/safety/adverse-events.html
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