Third dose?

Covid-19 booster shots: 8 questions and science-backed answers

Your questions about the third dose, answered.

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September 20, 2021, was technically the first day that some people who received their second shot of the Pfizer Covid-19 vaccine were eligible for a booster in the U.S.


That being said, you probably have questions about boosters — especially because not every expert is advocating for widespread availability.