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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  • Does mouthwash affect your immune system?

    Does mouthwash affect your immune system?

    A swish of mouthwash after brushing makes our mouths feel fresh and clean. But some scientists think your mouthwash could be hurting your immune system. Is there something sinister lurking in your oral care routine? See more »

  • How does measles reset your immune system?

    How does measles reset your immune system?

    New research shows that getting measles leaves you vulnerable to other infectious diseases until your body rebuilds its immunity -- and that can take several years. See more »

  • 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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