Anaphylaxis to the first Covid-19 Vaccine: is PEG the culprit?

Immediate-type life-threatening reactions to vaccines are exceedingly rare; they are reported to occur in 1.3 cases per million doses.

Therefore, two cases of anaphylaxis on the second day of a vaccination campaign with a new vaccine require further scrutiny. The first important task is to confirm that these cases were indeed anaphylaxis. If anaphylaxis is proved likely, the cause of the reaction should be identified.
March 9, 2021