Abstract
In December 2020, the US Food and Drug Administration (FDA) issued emergency use authorizations for coronavirus disease 2019 (COVID-19) vaccines from Pfizer-BioNTech and Moderna, and widespread vaccination is ongoing. Contraindications to vaccination include a history of immediate allergic reaction to a component or previous dose of an messenger RNA (mRNA) COVID-19 vaccine.1 As of January 18, 2021, anaphylaxis to the Pfizer-BioNTech (Pfizer Inc, New York, New York, BioNTech SE, Mainz, Germany) and Moderna (Moderna, Inc, Cambridge, Massachusetts) vaccines have occurred at rates of 4.7 and 2.5 cases per million doses, respectively.
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