Stanford University researchers led the study of 22 reported allergic reactions to the first 38,895 doses of the Pfizer/BioNTech and Moderna COVID-19 vaccines given to healthcare workers from Dec 18, 2020, to Jan 26, 2021 (less than six hundredths of a percent). Of all vaccinations, 80.6% were of the Pfizer vaccine, while 18.7% were of Moderna. The study population was 60% women, 64% White, 2% Black, 20% Asian, 16% younger than 50 years, and 54% aged 70 and older.

According to the national Vaccine Adverse Event Reporting System (VAERS), the rate of severe vaccine-related anaphylaxis, or a serious allergic reaction that requires hospitalization, is 4.7 per million for the Pfizer vaccine and 2.5 per million for Moderna. But the authors noted that VAERS tends not to capture mild or moderate allergic reactions to vaccines.

Women at higher risk for allergy

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