I think we are immunized to death anymore. Our kids have to have so many shots before they even go to school, it's not even funny. While we got some immunizations when we went to school, they weren't very many. Dating myself here, but I remember getting 2 polio shots and the last (3rd) in the series was on a sugar cube. Kinda weird now when I think about it. I've gotten a booster shot and a tetanus shot in school also.
There's a reason we have natural antibodies that are formed in our system after an illness. There's a reason we get the childhood stuff like measles, chicken pox, mumps, etc. No flu shot for me anymore. Last year I was standing in line for one and felt strongly compelled not to take it.....so I didn't. Won't have this one this year either. There have been some complications with the H1N1 virus shots. You had to get 2 shots before, but now everything is included in one shot this year (so they say). I don't trust the government or the Food and Drug Administration to tell me what is to be ingested into my body. I'll be the judge of that. Call me paranoid, but after what I've seen this year among our own political leaders, I'll keep my life in my own hands thank you.
Thing is, the flu virus keeps mutating, or there are so many different strains, that the flu shot you are getting has nothing to do with any new strain of flu that might start making the rounds this season. Any Doc or Pharm will tell you that the flu shot has only the old strains they know about.