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Drug susceptibility of patient-derived virus isolates to abacavir, zidovudine and tenofovir disoproxil fumarate (modelled as FCs relative to a reference isolate) by treatment group in patients with paired phenotypes (n = 16). ABC, abacavir; NVP, nevirapine; TDF, tenofovir disoproxil fumarate; ZDV, zidovudine.
