I've gotten one as long as I can remember. In the past few years, since I've been at college, I've gotten a booster flu shot around January or February. I think it's helped, the year I didn't get a booster i got a flu strand and landed in the hospital. I was miserably sick. I can't remember the last time I was that sick. When I started feeling crappy, I thought it was just my CF flaring up, but when it didn't go away for after a few days and got worse, and painful, I knew something was really wrong.Debbie