I get the flu, at least once a year whether or not I get a flu shot. If it's coming through the area, I'm getting it. I have a hereditary anemia which may contribute to my body's poor immune system. I suppose in years where I get a flu shot, if they have successfully guessed what strain of flu is likely to hit, I may have been spared the full force of the flu---but how do you really know?
I also tend to get sick following the flu shot about 50% of the time. I stopped getting flu shots for awhile, but I felt like I was getting hit harder with a couple really bad bouts. So, at my doctor's appt a couple weeks ago, he gave me the flu shot. Felt pretty bad for a couple days after and then...BAMN! got the flu. Lasted about a week. Not the worst as far as symptoms go, but still debilitating. Since I work in other people's homes and places of business, I can't exactly expose them to my illness. it effectively kept me out of work for a week. My question is, will I get the flu again in Jan/Feb? Probably. But maybe I'll miss my almost yearly Christmas flu.