Key points are not available for this paper at this time.
This JAMA Insights review provides clinical details of anaphylactic reactions reported to and verified by the CDC in the first month of use of the Pfizer-BioNTech and Moderna COVID-19 vaccines in the US, December 14, 2020-January 18, 2021.
Shimabukuro et al. (Fri,) studied this question.