Side effects of COVID-19 booster shot: 5 things to know

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Side effects of a third dose of either Pfizer or Moderna's COVID-19 vaccine are similar to those experienced after a second dose, according to a CDC report released Sept. 28. 

Five key takeaways from the report: 

  1. The report, which used data from 12,591 people who've received a third dose of either vaccine since the FDA authorized them for immunocompromised people in August, found no new serious or unexpected patterns of side effects emerging in people who get a booster.

  2. The data used in the CDC report comes from V-safe, the CDC's reporting system in which people voluntarily report side effects through an app.

  3. The CDC report said that 79.4 percent of people getting a booster shot reported a local reaction, such as pain at the injection site, compared to 77.6 percent of people who reported that reaction after their second dose.

  4. After a third dose, 74.1 percent of people reported a systemic reaction, such as headache or fatigue, compared to 76.5 percent of people who reported that reaction after their second dose.

  5. "These initial findings indicate no unexpected patterns of adverse reactions after an additional dose of COVID-19 vaccine; most of these adverse reactions were mild or moderate," the CDC report stated. 

Find the full report here


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