If you put any stock in Dr. Russell Blaylock, M.D., brain specialist and surgeon, the more flu shots you have the higher your chances of alzheimers. Brains don't like all the aluminum, mercury and other stuff contained in the vaccine. Plus they are almost always wrong about the strain of flu. They just don't know far enough ahead of time, but you lay down your money anyway and get the shot. I say no thanks and I haven't had flu for--I can't even remember when. It's been years!