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Allergy - Wikipedia, the free encyclopedia
An allergy is a hypersensitivity disorder of the immune system. Allergic reactions occur when a person's immune system reacts to normally harmless substances in the ... http://en.wikipedia.org/wiki/Allergy
allergy: Definition from Answers.com
allergy n. , pl. , -gies . An abnormally high sensitivity to certain substances, such as pollens, foods, or microorganisms http://www.answers.com/topic/hay-fever
Allergies: MedlinePlus Medical Encyclopedia
An allergy is an exaggerated immune response or reaction to substances that are generally not harmful. Allergies are pretty common. Both genes and ... http://www.nlm.nih.gov/medlineplus/ency...
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