I caught Covid 4 weeks after my first lung cancer surgery. I don't know how because I was careful to avoid people. It was mild just with productive cough that went away with the anti-viral. I was grateful I was up to date on my Covid vaccine!!!
Following my Mayo doctor recommendations to protect my lungs I am up to date on flu, Covid, and have had also Shingles, RSV and pneumonia vaccines. And I avoid people who are not up to date.
Life is a risk assessment of options. In medicine I follow the advice of those I know are qualified to speak on the subject. Vaccine benefits far outweigh the risks. And a sore arm is hardly a problem.