Lesson 3


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You are developing a basic understanding of the immune system. The immune system, like any of the body’s systems, can sometimes fail to work properly. If a person’s immune system is weak, it may not be able to stop infections and the person is more likely to become sick. But what about the reverse? Do you think it is possible for the immune system to work too well, to be overly aggressive?

Is it possible for the immune system to be overly aggressive?