Abstract
Human Immunodeficiency Virus Type-1 (HIV-1) drug-resistance testing is challenging for viral loads below 1,000 copies/mL, but, according to HIV-1 guidelines, it should be considered for improving patient management and treatment options. High-recovery and high-purity extraction methods can enhance standard performances of HIV-1 genotyping assays based on direct full-population sequencing. Aim of the present study was to evaluate performances of the NucliSENS easyMAG (NeM) (BioMerieux, Marcy l'Etoile, F) semi-automated nucleic acid extraction system combined with the direct full-population sequencing ViroSeq HIV-1 genotyping (Abbott, IL, US), for detecting drug resistance in samples with HIV-1 RNA<1,000 copies/mL (n=62). Data were compared with those from the ViroSeq manual extraction in 86 samples with HIV-1 RNA<1,000 copies/mL and studied on HIV-1 reference standards. HIV-1 genotyping was successful in 98% of samples extracted with NeM (61/62) and in 84% of those extracted with ViroSeq (72/86) (X(2)=8.508, p=0.004). HIV-1 RNA levels in samples successfully processed with NeM were significantly lower than those in manually processed ones (mean+/-SD, respectively, 285+/-222 copies/mL vs. 403+/-269 copies/mL) (p=0.004). For HIV-1...Continue Reading
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