While talking to a friend, the topic of vaccinations and flu shots came up. During the discussion, he said that the flu shot was harmful in the long run. According to “a study” he read about, receiving an annual shot prevents one’s immune system to developing its own resistance to flu strains. His position was that over the long term one would become “addicted” to the flu vaccine, so to speak, and can’t skip a year without getting sick. On the other hand, those who had gone without the vaccine would have stronger immune systems that can handle any flu strain without assistance.
That sounded pretty dubious to me. In casual discussions with others, this view seems to have a decent number of believers. I always thought the quick mutation rate of flu strains negated vaccination immunity as well as independently developed immunity on a pretty much equal basis.
Perhaps I’m one who need my ignorance fought. I’ve never read of this long-term “weakening of the immune system” effect. A Googling of this turned up some obvious quack sites saying “Yes” mixed with some “myth-dispelling” sites that just stated “No” without any evidence.
Is there really scientific evidence for this? Are the people who get regular flu shots actually worse off over the long term?