You are clueless about vaccines (except that you are a fanboy) and now just being argumentative about every point that I make. You made the claim that these were "old people" who had the severe adverse reactions. However, it was two healthcare workers who had these reactions.
"Front-line health workers, care home workers and those aged over 80 will receive the vaccine first."
https://www.cnbc.com/2020/12/08/uk-rolls-out-pfizer-coronavirus-vaccine-heres-what-you-need-to-know.html
"The two people affected were staff members with the National Health Service."
https://www.denverpost.com/2020/12/09/pfizer-covid-vaccine-allergic-reactions/