English to French Medical Medical: Health Care

For pregnant women with chronic hepatitis B virus (HBV) (i.e. hepatitis B surface antigen positive for >6 months)/HIV coinfection who require antiretroviral treatment for HIV disease or who require anti-HBV therapy, a three-drug regimen including a dual NRTI backbone of tenofovir plus 3TC or emtricitabine (FTC) is usually recommended

NRTI = INTI = inhibiteur nucléosidique de la transcriptase inverse

c'est dual backbone qui me pose pb, merci beaucoup !