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Answered 2008-08-08 20:59:29

Some of the bacteria known to cause urinary tract infections (UTI's) have an enzyme that change nitrate to nitrite. A positive nitrite test indicates that bacteria may be present in significant numbers in urine.

reference:

- http://www.medscape.com/viewarticle/410581

- http://library.med.Utah.edu/WebPath/TUTORIAL/URINE/URINE.html

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