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What is the body's first line of defense against bacteria and viruses

What is the body's first line of defense against bacteria and viruses
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What is the body's first line of defense against bacteria and viruses

User Izhaki
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Physical barriers such as your skin, and chemical barriers such as proteins that attack invaders in the body.
User Snuffn
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The first line of defense is physical barriers
User Theuniverseisflat
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