I've been taking flu shots every year since they first began. Never had much of an effect from one until about two years ago and that only amounted to a sore arm and feeling puny for a few hours, but never got sick. There were years when admittedly they missed the mark by "that" much and the shot did no good at all, except to maybe kick your immune system in the butt.
Knock on wood, but my wife and I got the super flu shots for two years and so far, so good. And horror of horrors, we have been violators of the first order by attending dinners at relatives where there were dozens of people in and out and not a mask in sight. In all honesty, I would have preferred to pass those gettogethers up, but the Boss says I have to take her anyway. Oh groan, there's another one coming up in a few days--something called Christmas.