Had a guy that I worked with decide that he was healthy and didn't need to get the shingles virus shots. When he came down with shingles, he weighed 165 pounds. At the pinnacle of his fight, he had dropped to 98 pounds! He had a rash over almost his entire body. The rash on his face got so bad that the doctors thought that he might even lose his sight.
I'm not a real vaccine guy, (as one that is still suffering from ill effects of the covid shots) and I don't get a flu shot BUT I did get my shingles vaccine. A day or two of pain is really worth it.