Virus, som var resistente over for zidovudin, zalcitabin, didanosin og NNRTIs, beholdt deres følsomhed over for emtricitabin (IC50=0, 002 µmol/ l- 0, 08 µmol/ l).
8 didanosine and zalcitabine), all non-nucleoside reverse transcriptase inhibitors (NNRTIs) and all protease inhibitors (PIs).