Abstract

The aim of highly-active antiretroviral therapy (HAART) is to suppress HIV-1 viral load (VL) to undetectable levels. All patients on HAART should have a VL measured at regular intervals in order to monitor the success of therapy. In October 2006 the Newcastle Health Protection Agency (HPA) laboratory replaced the Roche COBAS HIV-1 Ampliprep Amplicor Monitor (CAP/CA) assay with the more-sensitive Roche COBAS Ampliprep Taqman HIV-1 (CAP/CTM1) assay. Both locally and internationally the introduction of the CAP/CTM1 assay was associated with a significant unexplained increase in the detection of low level HIV-1 viraemia (VL 50 to 1000 copies/ml).

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