Allergic Reactions Including Anaphylaxis After Receipt of the First Dose of Pfizer-BioNTech COVID-19 Vaccine

US report finds that, up until 23 Dec, 1,893,360 first doses of the Pfizer vaccine were given, and 21 case reports meeting the case definition for anaphylaxis were identified. 71% had symptom onset within 15 mins and 86% within 30 mins. 81% had a documented history of allergies.

Journal of the American Medical Association