On the first day of the UK campaign for COVID-19 vaccination, there were reports of two cases of anaphylaxis—a severe, potentially life-threatening allergic reaction—within minutes of administration of the Pfizer/BioNTech mRNA vaccine. Subsequently further cases of suspected anaphylaxis to the Pfizer vaccine were reported.
A new report published in Clinical & Experimental Allergy reveals that an allergy to the ingredient polyethylene glycol (PEG) is a cause of anaphylaxis to the vaccine. However, this is in the context of millions of doses safely administered.
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