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Antigens are foreign substances (e.g. [[bacteria]] or [[viruses]]) in the body that are capable of causing disease. The presence of antigens in the body triggers an immune response, usually the production of [[antibodies]].
Antigens are foreign substances (e.g. [[bacteria]] or [[viruses]]) in the body that are capable of causing disease. The presence of antigens in the body triggers an immune response, usually the production of [[antibodies]].<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#a</ref>
==References==
<references/>
[[Category:Medicine]]
[[Category:Medicine]]