The risks of Pfizer’s COVID-19 vaccine for patients with a history of severe allergies

Two people in the United Kingdom have experienced an allergic reaction to the Pfizer/BioNTech COVID-19 vaccine. This led the UK medicines regulator to issue precautionary advice earlier this week that “people with a significant history of allergic reactions” should not be given this vaccine for now. This is an appropriate cautious move. The advice may change once we understand more about what caused these reactions. Both people reportedly had known allergies and carried adrenaline autoinjectors, suggesting they had a prior history of severe allergic reactions, such as anaphylaxis, a severe and rapid form of allergy. At this stage, we do…

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