HIV-1 drug resistance genotyping success rates and correlates of Dried-blood spots and plasma specimen genotyping failure in a resource-limited setting

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Abstract Background: HIV-1 drug resistance genotyping is critical to the monitoring of antiretroviral treatment. Data on HIV-1 genotyping success rates of different laboratory specimen types from multiple sources is still scarce. Methods: In this cross-sectional study, we determined the laboratory genotyping success rates (GSR) and assessed the correlates of genotyping failure of 6837 unpaired dried blood spot (DBS) and plasma specimens from multiple studies/sources. Specimens from multiple studies in a resource-constrained setting were analysed in our laboratory between 2016 and 2019. Results: We noted an overall GSR of 65.7% and specific overall GSR for DBS and plasma of 49.8% and 85.9% respectively. The correlates of genotyping failure were viral load (VL) <10,000 copies/mL (aOR 0.3 95% CI: 0.24-0.38; p<0.0001), lack of viral load testing prior to genotyping (OR 0.85 95% CI: 0.77-0.94; p=0.002), use of DBS specimens (aOR 0.10 95% CI: 0.08-0.14; p<0.0001) and specimens from routine clinical diagnosis (aOR 1.4 95% CI: 1.10-1.75; p=0.005). Conclusions: We report rapidly decreasing HIV-1 genotyping success rates between 2016 and 2019 with increased use of DBS specimens for genotyping and note decreasing median viral loads over the years. We recommend improvement in DBS handling, viral load testing prior to genotyping and development of more sensitive assays to genotype specimens with low or undetectable viral load, especially in this era where virological suppression rates are rising due to increased antiretroviral therapy roll-out.

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