What The Study Did: Researchers examined the safety of the second dose of the Pfizer-BioNTech or Moderna COVID-19 vaccines in patients who experienced an allergic reaction to the first dose.

Authors: Kimberly G. Blumenthal, M.D., M.Sc., of Massachusetts General Hospital in Boston, is the corresponding author.

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(doi:10.1001/jamainternmed.2021.3779)

Editor's Note: The article includes conflicts of interest and funding and support disclosures. Please see the article for additional information, including other authors, author contributions and affiliations, conflict of interest and financial disclosures, and funding and support.

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