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Background   This study aimed to evaluate HIV type-1 (HIV-1) drug resistance pretreatment and in those failing first-line non-nucleoside reverse transcriptase inhibitor (NNRTI)-based antiretroviral therapy (ART) in South Africa.Methods   This was an observational cohort. Genotypic resistance testing was performed on treatment-naive individuals and those failing first-line ART (confirmed HIV-1 RNA&gt;1,000 copies/ml) from public sector clinics in Cape Town (2002–2007). Resistance profiles and mutations relative to timing of known virological failure were examined.Results   In total, 230 patients (120 treatment-naive and 110 with virological failure) were included: 98% had clade C virus. Among treatment-naive patients, prevalence of primary resistance was 2.5% (95% confidence interval 0.0–5.3). Three patients had one significant reverse transcriptase mutation: K65R, Y181C and G190A. Among treatment-experienced patients, 95 (86%) individuals had therapy-limiting NNRTI mutations, including K103N (55%), V106M (31%) and Y181C (9%). The M184V mutation was the most common mutation, found in 86 (78%) patients. In total, 10 (9%) patients had the K65R mutation. More individuals tended to develop thymidine analogue mutations when sampling occurred after 6 months of detected therapy failure (10/31 [32%] individuals) compared with those who had genotyping before 6 months (15/79 [19%] patients; P=0.246).Conclusions   Prevalence of primary resistance in a sample of ART-naive clade C HIV-1-infected individuals in South Africa was low during the study period. Patients failing first-line ART most often developed resistance to NNRTIs and nucleoside reverse transcriptase inhibitors, the two drug classes used in first-line therapy. Viral load monitoring in this setting is crucial and individual genotypes in those failing first-line therapy should be considered.

antiviral therapy

HIV type-1 clade C resistance genotypes in treatment-naive patients and after first virological failure in a large community antiretroviral therapy programme