Oral abstracts of the 21st International AIDS Conference 18-22 July 2016, Durban, South Africa

The rate at which HIV-1 infected individuals progress to AIDS is highly variable and impacted by T cell immunity. CD8 T cell inhibitory molecules are up-regulated in HIV-1 infection and associate with immune dysfunction. We evaluated participants (n=122) recruited to the SPARTAC randomised clinical trial to determine whether CD8 T cell exhaustion markers PD-1, Lag-3 and Tim-3 were associated with immune activation and disease progression.Expression of PD-1, Tim-3, Lag-3 and CD38 on CD8 T cells from the closest pre-therapy time-point to seroconversion was measured by flow cytometry, and correlated with surrogate markers of HIV-1 disease (HIV-1 plasma viral load (pVL) and CD4 T cell count) and the trial endpoint (time to CD4 count <350 cells/μl or initiation of antiretroviral therapy). To explore the functional significance of these markers, co-expression of Eomes, T-bet and CD39 was assessed.Expression of PD-1 on CD8 and CD38 CD8 T cells correlated with pVL and CD4 count at baseline, and predicted time to the trial endpoint. Lag-3 expression was associated with pVL but not CD4 count. For all exhaustion markers, expression of CD38 on CD8 T cells increased the strength of associations. In Cox models, progression to the trial endpoint was most marked for PD-1/CD38 co-expressing cells, with evidence for a stronger effect within 12 weeks from confirmed diagnosis of PHI. The effect of PD-1 and Lag-3 expression on CD8 T cells retained statistical significance in Cox proportional hazards models including antiretroviral therapy and CD4 count, but not pVL as co-variants.Expression of ‘exhaustion’ or ‘immune checkpoint’ markers in early HIV-1 infection is associated with clinical progression and is impacted by immune activation and the duration of infection. New markers to identify exhausted T cells and novel interventions to reverse exhaustion may inform the development of novel immunotherapeutic approaches

Evaluating a youth-designed sexual and reproductive health mass and social media campaign in Côte d’Ivoire: triangulation of three independent evaluations

AbstractMerci Mon Héros (MMH) is a youth-designed multi-media campaign seeking to improve sexual and reproductive health and family planning (SRH/FP) outcomes among youth living in nine francophone countries. A mixed methods approach was implemented to assess the MMH campaign progress and impact in Côte d’Ivoire. Three data sources were triangulated to evaluate the campaign: social media listening (October 2019–January 2021); a quantitative cross-sectional monitoring survey (September 2020) with 412 youth (aged 16–24) and 597 adults (aged 25–49); and a qualitative study using a Most Significant Change approach (March 2021), including a total of 24 focus group discussions with youth (aged 15–24) and adults (aged 25+) exposed to the MMH campaign. Data from all three studies were analysed independently and then brought together through a triangulation workshop where the study team compared findings to achieve convergence in evaluation results. Social listening results showed topic-specific online conversations related to MMH campaign spiked significantly during the two-week period after topic-specific campaign posts (p < .05), suggesting potential campaign impact. Survey results showed both adults and youth were more likely to have spoken with someone about FP in the past five months if exposed to the campaign (p < 0.01). Qualitative findings support the campaign’s effect on shifting attitudes and behavioural uptake of intergenerational communication among adults and youth. This evaluation shows evidence of MMH’s strong potential for impact in encouraging communication and the need to focus efforts on strategies to strengthen supportive adults’ communication competencies and redefine what it means to act in support of SRH/FP for youth