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When a nurse or doctor pricks you with their needle they are sending many cells of a virus (the flu for example). At this time, your immune system attacks every cell that is pumped into your arm. But there is something different about these virus cells... They are not alive. They are simply the virus, but not alive, therefore it can do no harm to the body. But the immune system doesn't take any chances with it. It tears the cells apart and while doing so, remembers how it was able to attack the cells for the next time that same virus comes around. Therefore, your body will know how to get rid of that certain virus because it has already come into contact with it... it was just dead.

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16y ago

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