I've never had a "flu shot". I did get the Shingles Shot and the Pneumonia Shot. The problem with the "flu shot" is that they have to guess what strain of flu virus is going to come
this year. It's decided by committee, so...well, that's a problem in itself. But a few years ago, they predicted wrongly, and the flu shots did absolutely nothing.
Meanwhile, if you have the flu, stay home, but most important, stay the he!! away from me!

Steve