I used to never get flu shots. Now that I am older, I do. A few years ago I got the flu real bad - a lot of congestion in my lungs. I had never been sick quite that bad before and it really scared me. That is when I decided to get flu shots. I have had the flu a few times since I started with the flu shots, but not as severe as that one time I got so sick that it scared me. I had a flu shot a few weeks ago - no problems.
I haven’t even had a bad cold since getting a flu shot on a yearly basis ... don’t know if there is any correlation ... but?