Emtricitabin- resistente virus var krydsresistente over for lamivudin, men beholdt følsomhed over for andre nukleosid reverse transkriptasehæmmere (Nucleoside Reverse Transcriptase Inhibitors, NRTIs) (zidovudin, stavudin, tenofovir, abacavir, didanosin og zalcitabin), alle non- nukleoside reverse transkriptasehæmmere (Non- Nucleoside Reverse Transcriptase Inhibitors, NNRTIs) og alle proteasehæmmere (Protease Inhibitors, PIs).
Emtricitabine-resistant viruses were cross-resistant to lamivudine, but retained sensitivity to other nucleoside reverse transcriptase inhibitors (NRTIs) (zidovudine, stavudine, tenofovir, abacavir,