Abstract
A highly sensitive nested PCR was carried out in order to detect 2 LTR circles as a marker of recent and ongoing viral replication in HIV-1 infected patients with HIV plasma RNA undetectable. This “in house” two-step nested PCR is very sensitive, but it is not feasible for routine tests and presents a high risk of contamination. In order to reduce the time of reactions and crossover contamination, the possibility was explored to carry out a single step nested PCR, in which the two successive amplification rounds are carried out in the same tube. This single step nested PCR has the same sensitivity of the two-step nested, is easy to conduct and requires a short time of reaction. The two different PCR methods were compared and the clinical use of monitoring 2 LTR DNA circles in HIV-1 infected patients with undetectable plasma viral load is discussed.
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