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How does your immune system work?


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When your immune system works the way it should, it can tell the difference between “good” cells that keep you healthy and “bad” cells that make you sick.  It should recognize bacteria, viruses, parasites, and other harmful attackers.  It can then mark them to be destroyed.
In some people, the immune system doesn't know when to stop fighting.  If this happens to you, you may have an allergic reaction, such as to pollen or to dust or to certain foods.

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