Allergy is a condition in which the body has an exaggerated response to a substance (e.g. food or drug). Allergy is also known as hypersensitivity.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#a</ref>
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An '''allergy''' is a condition in which the body has an exaggerated response to a substance (e.g. food or drug). The term allergy is also known as hypersensitivity.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#a</ref>