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Definition of Skin test for immunity

Skin test for immunity: A method of evaluating whether a person has developed an immune response to a certain infection. A substance is injected into the deep layer of the skin (dermis) and causes a reaction if the immune system recognizes it. One of the most common skin tests is the tuberculin test, which reveals whether a person has been exposed to tuberculosis. The injection is placed on the inside of the forearm, and a positive reaction results in a raised, firm area of skin at the injection site within 2 days.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=7205
Last Editorial Review: 3/19/2012

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