An open-label, multi-centre randomised controlled trial of DTG vs efavirenz-based regimens for women commencing cART in late pregnancy. HIV positive pregnant women presenting with untreated HIV infection in late (≥28 weeks gestation) pregnancy will be randomised 1:1 to receive DTG (50mg once daily) + 2 nucleoside reverse transcriptase inhibitors (NRTIs) or EFV + 2 NRTIs (SoC)