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Article: Allergies
- Article from:
- Gale Encyclopedia of Children's Health: Infancy throughAdolescence
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Copyright informationCOPYRIGHT 2006 Thomson Gale. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Allergies
Definition
Allergies are abnormal reactions of the immune system that occur in response to otherwise harmless substances.
Description
Allergies are among the most common of medical disorders. It is estimated that 60 million Americans, or more than one in every five people, suffer from some form of allergy, with similar proportions throughout much of the rest of the world. Allergy is the single largest reason for school absence and is a major source of lost productivity in the workplace.
Allergies are a type of immune reaction. Normally, the immune system responds to foreign microorganisms, or particles, like pollen or dust, by producing specific proteins, called ...
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