IMMUNE SYSTEM

Inside your body, there is a mechanism designed to defend you from millions of bacteria, microbes, viruses, toxins and parasites. Find out the different components and how the human immune system works.
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How Your Immune System Works

There are millions of bacteria, microbes, viruses, toxins and parasites that want to invade your body. And they'd happily do it, too -- if it weren't for your immune system.

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  • How Your Immune System Works

    How Your Immune System Works

    There are millions of bacteria, microbes, viruses, toxins and parasites that want to invade your body. And they'd happily do it, too -- if it weren't for your immune system. See more »

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