To deal with the possibility of infection, multicellular animals have specialized cells or tissues. Some of these reactions occur promptly in order to confine an infectious pathogen. Other reactions are slower, but they are more specific to the infecting agent. The immune system is the collective name for these defenses. The human immune system is critical for our survival in a world full of potentially hazardous microorganisms, and even a little weakening of one of its arms can put us at risk for serious, even life-threatening infections.
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