How long does a flu shot work?

Question

Every year they infectious disease nurse hunts me down specifically to give me a flu shot. She brings up 1 injection just for me and gives it every year.
How long should it work? Just because you get it once a year, does that mean the immunity is there for 1 whole year or what?
Its amazing I dont get a cold or anything when I have a flu shot, but for many years, I was sick every winter over and over again.

Answer 1

Happy, I really can't say, but it should last longer than a year, I believe they give flu shot as a booster every year! I'm not sure! but I have one in October or November every year! Jimmy.