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Describes a disease in which the immune system makes a response to a harmless antigen.

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Biology Human Biology
    Body Story: Allergies: Teacher's Guide
    Community Contributed
    Lesson plan is based on a discover video. "Program Description: It hurts to get stung by a wasp, but it’s dangerous if you happen to be allergic to them. Learn why a sting may be just a pain to one person but cause an extreme histaminic response—and even death—in another." - Discover Education.
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