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May 18, 2013
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Definition of Specific-pathogen free

Specific-pathogen free: A term that is applied to animals reared for use in laboratory experiments which indicates that the animals are known to be free of germs that can cause disease. Abbreviated SPF.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=6331
Last Editorial Review: 3/19/2012

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