- December 9 – UK authorities confirmed 2 cases of anaphylaxis after vaccination
- December 18*, 2020 – CDC has identified 6 case reports of anaphylaxis following Pfizer-BioNTech vaccine meeting Brighton Collaboration criteria for anaphylaxis
- Persons with anaphylaxis following COVID-19 vaccination should not receive additional doses of COVID-19 vaccine
Anaphylaxis
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