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Understanding the immune system how it works

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The immune system is a network ofcells, tissues*, and organs that worktogether to defend the body against attacksby “foreign” invaders. These are primarilymicrobes(germs)—tiny, infection-causingorganismssuch as bacteria, viruses,parasites, and fungi. Because the humanbody provides an ideal environment formany microbes, they try to break in. It isthe immune system’s job to keep them outor, failing that, to seek out and destroy them

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