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Definition of Virus, attenuated

Virus, attenuated: A virus that has been weakened. A vaccine against a viral disease can be made from an attenuated, less virulent strain of the virus: a virus that is capable of stimulating an immune response and creating immunity but not of causing illness.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=7151
Last Editorial Review: 3/19/2012

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