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Bacteria Attacking The Immune System. The Immune System Protects The Body From Possibly Harmful Substances By Recognizing And Responding To Antigens. Antigens Are Substances (Usually Proteins) On The Surface Of Cells, Viruses, Fungi, Or Bacteria.

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Bacteria attacking the immune system. The immune system protects the body from possibly harmful substances by recognizing and responding to antigens. Antigens are substances (usually proteins) on the surface of cells, viruses, fungi, or bacteria.

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