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  1. Sep 29, 2021 · This was reported by 79.4% of people following their third shot, compared to 77.6% following a second dose. Fever or headache was reported by 74.1% of people following their booster shot, compared to 76.5% after a second dose. "Most reported local and systemic reactions were mild to moderate, transient, and most frequently reported the day ...

  2. Sep 24, 2021 · More than 21,000 people who've received a third dose of Pfizer or Moderna's COVID-19 vaccine shared their side effects with the CDC. CDC ACIP meeting, September 22, 2021. Health officials are not ...

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  4. Sep 28, 2021 · Reactions at the injection site, like pain or swelling, were reported by 79.4 percent of recipients after a third vaccine dose, compared with 77.6 percent after a second dose. Slightly smaller ...

    • Benjamin Mueller
  5. May 22, 2022 · Although Moderna's booster is half the dose of the initial vaccine, a lower dose doesn’t necessarily mean fewer side effects. In Moderna's application for authorization of a booster shot (announced on September 1), the company said that the side effects after a third shot are comparable to those reported after the primary series.

  6. Nov 21, 2023 · Side effects from the vaccine can vary from person to person and dose to dose, the experts note. According to the CDC, the most common side effects from COVID-19 vaccination include: Pain, redness ...

    • Caroline Kee
  7. Aug 13, 2021 · The CDC recommended that people with weakened immune systems get a third shot of either the Pfizer-BioNTech or Moderna vaccine. The move follows the FDA's authorization of such use a day earlier.

  8. Dec 22, 2020 · After releasing positive interim results from its phase 3 trial on Nov. 16, 2020, Moderna announced on Nov. 30 that its vaccine had an efficacy of 94.1% in preventing disease in adults. The ...

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