Here is an article about the results of a recent study on allergic reactions to the vaccine. Bottom line up front is it found 2.47 allergic reactions (e.g., anaphylaxis) out of each 10,000 vaccines administered. That is something like less than one quarter of one-tenth of one percent. Happily, instances of anaphylaxis were also easily handled.

https://consumer.healthday.com/b-3-9-study-confirms-very-low-risk-of-severe-allergic-reaction-to-covid-vaccines-2650992530.html