Interpretation of genotypic resistance to HIV-1 reverse transcriptase (RT) drugs [nucleoside and nonnucleoside reverse transcriptase inhibitor (NRTI and NNRTI)]. 3TC, lamivudine; ABC, abacavir; AZT, zidovudine; d4T, stavudine; DDI, didanosine; FTC, emtricitabine; TDF, tenofovir; EFV, efavirenz; ETR, etravirine; NVP, nevirapine; RPV, rilpivirine.