The Treatment Ambassador Program: Pilot Testing a Peer-driven Intervention to Increase Treatment Initiation Among HIV-positive South Africans

Global HIV treatment initiatives have focused on increasing access to antiretroviral therapy (ART), with the goal of creating an "AIDS-free generation." There is growing evidence, however, that treatment availability alone is insufficient to stop the spread of the disease. Countries where HIV is hyperendemic, such as South Africa, will not achieve population-level reductions in HIV until incident infections have been dramatically reduced over a lifetime, and people living with HIV (PLWH) no longer wait to start treatment until they have symptoms of advanced AIDS. As South Africa expands ART eligibility to all people living with HIV, it remains unclear if promoting earlier ART initiation will lead to widespread uptake. These operational realities raise two fundamental questions: how will we close the gap from the 3.4 million PLWH currently on ART to treating the over seven million people who need care; and what does this portend for the future of Treatment as Prevention in South Africa? The investigators' prior research suggests that optimizing ART initiation for PLWH in South Africa will require an intervention to reduce individual barriers to starting ART, promote social support, and enhance linkages to the healthcare system. In the proposed study, the investigators will build upon our prior research to pilot test a socio-behavioral multi-component peer intervention, to ensure that South Africans living with HIV initiate and sustain treatment. Investigators will test this intervention through a pilot randomized-controlled trial. This multi-component intervention is designed to address barriers to ART initiation identified in prior qualitative research, framed through the Theory of Triadic Influence (TTI). TTI focuses upon three "streams of influence" that impact health behavior at the individual-, social-, and structural-levels. The intervention will be delivered by "Treatment Ambassadors," who are PLWH who will function in multiple capacities, and have received intensive training in motivational interviewing (MI), peer-support, and peer navigation. They will then provide the intervention in eight sessions over 8-14 weeks. The intervention will be individually tailored to address the three streams of influence on patient decision-making as follows: MI will address individual perceived risk and ambivalence in decision-making; peer-support will target interpersonal social factors; and patient navigation will promote ART initiation and counter structural barriers.

Investigators will enroll 90 participants (45 in each arm) with the goal of assessing feasibility and acceptability. Investigators enrolled 84 participants in total. The 90 participant mark was not met due to time constraints and our eligibility requirements. In addition, preliminary efficacy will be assessed through the following measures:

Primary Outcome Measure: Timely ART initiation (initiation within 3 months of enrollment) (assessed through the National Health Laboratory Service, pharmacy records, and medical chart abstraction).

Secondary Outcomes Measures: 1) HIV-1 RNA Suppression within the first 6 months of study enrollment (assessed through the National Health Laboratory Service).

2. Behavioral Factors associated with failure to initiate ART in a timely manner.