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HSV DNA remains quantitatively stable for real-time PCR when it is stored for 16 months as purified DNA at 4°C. Dacron swab specimens were obtained in April 2000, and HSV DNA was extracted and quantitated by real-time PCR. The purified DNA was then stored for 16 months at 4°C and reanalyzed in August 2001 by a real-time PCR assay identical to the one used in April 2000.
