Impact of low-grade viremia on the risk of virological failure in patients with HIV-1 infection on antiretroviral therapy

Abstract

Background: Viral loads (VL) between 20-200 copies/mL are considered low-grade viral loads (LGVL). Its clinical implications and management have not been defined. Aim: To evaluate the impact of LGVL on the risk of subsequent development of virological failure (VF). Methods: Patients ³ 18 years, with HIV-1 infection who had VL <20 copies/mL for at least six months and/or in two consecutive samples under antiretroviral therapy (ART) were included, between January 1^st, 2009 and December 31, 2019. Follow-up of the VLs was carried out stratifying them in VL <20 copies/mL, LGVL (20-50 copies/mL and 51-200 copies/mL) and VF. Median follow-up 25 months (IQR 15-31). Results: 1416 patients were included who reached VL <20 copies/ml under ART, 797 patients remained with CV <20 copies/mL during follow-up, 144 patients had VL between 21-50 copies/mL, 384 between 51-200 copies/mL and 91 had VF without previous LGVL.
Out of 528 patients who had LGVL, 110 failed, risk 3.45 times higher than those who had no previous LGVL. Risk 3.27 times higher of VF for those who had LGVL between 51-200 copies/mL compared to 20-50 copies/mL. Discussion: The study allows to relate the LGVL with VF. This association was observed more frequently with LGVL between 51-200