In this article, it is discussed how when we get older our immune system is different than when we are younger. From this, there are different effects of vaccines on elderly people. They are not as protected from the disease after the vaccination, because their immune system doesn't work the same. Elderly people cannot rely on current vaccines as a save-all technique because researchers are finding out everyday information that says they do not get full protection. In the future, these researchers are trying to improve vaccines and cater them towards elderly people so they can get the same care as younger generations.
http://cid.oxfordjournals.org/content/46/7/1078.full.pdf+html
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