Pfizer Vaccine Ingredient PEG May Cause Anaphylaxis

Pfizer Vaccine Ingredient PEG May Cause Anaphylaxis
Key messages:
- The Pfizer/BioNTech COVID-19 vaccine can cause severe anaphylaxis of unknown cause
- Here, we show polyethylene glycol (PEG) allergy caused one of the first cases of anaphylaxis to the Pfizer/BioNTech COVID-19 vaccine
- Allergy skin prick testing with polyethylene glycol triggered anaphylaxis, highlighting the importance of safety procedures during investigation