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ALLERGY AND IMMUNOLOGY

Allergy is a hypersensitivity reaction of the body against certain substances, called allergen. In other words, it is an exaggerated form of the body’s reaction against hazardous substances and organisms. It is a protective mechanism in healthy human. In people who are predisposed to allergy, the body cannot discriminate the hazardous substances from the non-hazardous ones and finally, a reaction occurs against non-hazardous ones. Thus, the protective mechanism transforms into a hazardous one. The term immunologic diseases imply deficiency of the immune system and all diseases and disorders of the immunity.

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