Immunity comes...: ....About naturally when your body is exposed to something foreign to it (like a bacteria, or a virus, or a fungus), and you develop antibodies which your body uses to destroy what your immune system regards as a foreign invader. For example: you are infected with measles. Your body sees the measles virus is foreign and kills it. You are then immune, and that immunity was developed naturally.
Answered 9/22/2012
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