i2-D²EFT substudy an observational cohort nested within the parent open label phase III/IV randomised controlled trial of simplified second-line therapy, D²EFT (NCT03017872). Participants consenting to D²EFT study will be randomised within the three arms: either ritonavir-boosted darunavir plus two nucleosides or dolutegravir plus two predetermined nucleosides (tenofovir disoproxil fumarate plus lamivudine or emtricitabine) or ritonavir-boosted darunavir plus dolutegravir. Enrolment into the i2-D²EFT substudy is voluntary and optional for participants in D²EFT. Parameters relevant to i2-D²EFT substudy including demographics, arm of randomised ART, HIV history, physical examination, immunological and virological results, episodes of co-infections and adverse events due to any infection or malignancies at required time points will be collected as part of D²EFT study. Substudy specific assessments performed at baseline and at weeks 48 include sample collection for IL-6 dosage plus EBV/CMV/HHV8 testing, and optional anal/cervical HPV screening.
