Browsing by Author "Toska, Elona"

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    Age-specific all-cause mortality rates among adolescents and youth living with and without HIV: evidence from a cohort study in South Africa
    (John Wiley and Sons Inc, 2025) Knight, Lucia; Zhou, Siyanai; Toska, Elona
    Introduction: Mortality among adolescents living with HIV (ALHIV) remains a global health problem. We lack granular (age- and sex-disaggregated) data on mortality among ALHIV, hence, this study aims to assess all-cause mortality among ALHIV in a low-resource setting. Methods: All adolescents ever initiated on antiretroviral treatment (ART, N = 1107) and their HIV-negative peers (N = 456) aged 10–19 years, recruited as part of the Mzantsi Wakho study cohort, were followed up between 2014 and 2022 (yielding 12,427.7 person-years of follow-up). First, we assessed the proportion of deaths and estimated crude mortality incidence rates per 100 person-years of follow-up and their 95% confidence intervals, stratified by HIV status, sex and mode of HIV acquisition (vertical vs. sexual). We then estimated adjusted incidence rate ratios (IRRs) using Poisson regression adjusted for time-varying age, sex and time on ART. Last, we used the Cox proportional hazards regression model to estimate the risk of death by ART adherence. Results: A total of 1563 adolescents and young people were included in this analysis, 70.8% ALHIV and 57% female. More deaths occurred in ALHIV compared to their HIV-negative peers (8.3% vs. 0.4%, p<0.001). Among ALHIV, we observed a significantly higher proportion of deaths among males compared to females (10.7% vs. 7.1%, p = 0.036). Overall, mortality increased significantly with age, and males had a higher risk of mortality compared to females. Adolescents and youth living with vertically acquired HIV had a higher risk of mortality than those living with sexually acquired HIV. Comparing mortality rates by mode of HIV acquisition stratified by age and sex, mortality risk was higher among females aged 20+ years with vertically acquired HIV (IRR: 3.61, 95% CI 1.48–8.82) compared to females with sexually acquired HIV of the same age group. In a sub-sample analysis, sustained ART adherence was associated with a lower risk of death (aHR: 0.44, 95% CI 0.23–0.85).
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    Exploring self-reported adherence measures to screen for elevated HIV viral load in adolescents: A South African cohort study
    (Springer, 2023) Zhou, Siyanai; Toska, Elona; Knight, Lucia
    The timely identification of ART non-adherence among adolescents living with HIV presents a significant challenge, particularly in resource-limited settings where virologic monitoring is suboptimal. Using South African adolescent cohort data (N = 933, mean age 13.6 ± 2.89 years, 55.1% female, follow-up = 2014–2018), we examined the association between elevated viral load (VL ≥ 1000 copies/mL) and seven self-reported adherence measures on missed doses, and clinic appointments –with varying recall timeframes. The best performing measures, which were significantly associated with elevated viral load in covariate-adjusted models are: any missed dose –past 3 days (sensitivity = 91.6% [95%CI: 90.3–92.8], positive predictive value (PPV) = 78.8% [95%CI: 77.2–80.4]), –past week (sensitivity = 87% [95%CI: 85.4–88.6], PPV = 78.2% [95%CI: 76.5–79.9]), –past month (sensitivity = 79.5% [95%CI: 77.5–81.4], PPV = 78.2% [95%CI: 76.4–79.9]), any pastmonth days missed (sensitivity = 86.7% [95%CI: 85.1–88.3], PPV = 77.9% [95%CI:76.2–79.6]), and any missed clinic appointment (sensitivity = 88.3% [95%CI: 86.8–89.8], PPV = 78.4% [95%CI: 76.8–79.9]).
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    Resourcing resilience: Social protection for HIV prevention amongst children and adolescents in Eastern and Southern Africa
    (Routledge, 2016) Toska, Elona; Gittings, Lesley; Chademana, K Emma
    Adolescents are the only age group with growing AIDS-related morbidity and mortality in Eastern and Southern Africa, making HIV prevention research among this population an urgent priority. Structural deprivations are key drivers of adolescent HIV infection in this region. Biomedical interventions must be combined with behavioural and social interventions to alleviate the socio-structural determinants of HIV infection. There is growing evidence that social protection has the potential to reduce the risk of HIV infection among children and adolescents. This research combined expert consultations with a rigorous review of academic and policy literature on the effectiveness of social protection for HIV prevention among children and adolescents, including prevention for those already HIV-positive. The study had three goals: (i) assess the evidence on the effectiveness of social protection for HIV prevention, (ii) consider key challenges to implementing social protection programmes that promote HIV prevention, and (iii) identify critical research gaps in social protection and HIV prevention, in Eastern and Southern Africa. Causal pathways of inequality, poverty, gender and HIV risk require flexible and responsive social protection mechanisms. Results confirmed that HIV-inclusive child- and adolescent-sensitive social protection has the potential to interrupt risk pathways to HIV infection and foster resilience. In particular, empirical evidence (literature and expert feedback) detailed the effectiveness of combination social protection particularly cash/in-kind components combined with “care” and “capability” among children and adolescents. Social protection programmes should be dynamic and flexible, and consider age, gender, HIV-related stigma, and context, including cultural norms, which offer opportunities to improve programmatic coverage, reach and uptake. Effective HIV prevention also requires integrated social protection policies, developed through strong national government ownership and leadership. Future research should explore which combinations of social protection work for sub-groups of children and adolescents, particularly those living with HIV.
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    STACKing the odds for adolescent survival: health service factors associated with full retention in care and adherence amongst adolescents living with HIV in South Africa
    (Wiley Open Access, 2018) Cluver, Lucie D.; Pantelic, Marija; Toska, Elona; Orkin, Mark; Casale, Marisa; Bungane, Nontuthuzelo; Sherr, Lorraine
    INTRODUCTION: There are two million HIV-positive adolescents in southern Africa, and this group has low retention in care and high mortality. There is almost no evidence to identify which healthcare factors can improve adolescent self-reported retention. This study examines factors associated with retention amongst antiretroviral therapy (ART)-initiated adolescents in South Africa. METHODS: We collected clinical records and detailed standardized interviews (n = 1059) with all 10- to 19 year-olds ever initiated on ART in all 53 government clinics of a health subdistrict, and community traced to include lost-to-follow-up (90.1% of eligible adolescents interviewed). Associations between full self-reported retention in care (no past-year missed appointments and 85% past-week adherence) and health service factors were tested simultaneously in sequential multivariate regression and marginal effects modelling, controlling for covariates of age, gender, urban/rural location, formal/informal housing, maternal and paternal orphanhood, vertical/horizontal HIV infection, overall health, length of time on ART and type of healthcare facility. RESULTS: About 56% of adolescents had self-reported retention in care, validated against lower detectable viral load (AOR: 0.63, CI: 0.45 to 0.87, p = 0.005). Independent of covariates, five factors (STACK) were associated with improved retention: clinics Stocked with medication (OR: 3.0, CI: 1.6 to 5.5); staff with Time for adolescents (OR: 2.7, CI: 1.8 to 4.1); adolescents Accompanied to the clinic (OR: 2.3, CI: 1.5 to 3.6); enough Cash to get to clinic safely (OR: 1.4, CI: 1.1 to 1.9); and staff who are Kind (OR: 2.6, CI: 1.8 to 3.6). With none of these factors, 3.3% of adolescents reported retention. With all five factors, 69.5% reported retention. CONCLUSIONS: This study identifies key intervention points for adolescent retention in HIV care. A basic package of clinic and community services has the potential to STACK the odds for health and survival for HIV-positive adolescents.
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    Suicidal thoughts and behaviour among South African adolescents living with HIV: Can social support buffer the impact of stigma?
    (Elsevier, 2018) Casale, Marisa; Boyes, Mark; Pantelic, Marija; Toska, Elona; Cluver, Lucie D.
    BACKGROUND: Adolescents living with HIV represent a high-risk population for suicidal ideation and attempts, especially in low-income settings. Yet little is known about risk and protective factors for suicide in this population. METHODS: A moderated mediation model was employed to test for potential (a) effects of stigma on suicidal ideation and attempts, both direct and mediated through depression and (b) direct and stress-buffering effects of social support resources on depression and suicidal ideation and attempts, among 1053 HIV-positive 10–19-year-old adolescents from a resource-scarce health district in South Africa. The survey data was collected using full community sampling of 53 clinics and tracing to over 180 communities. Effects of two support resources were tested: perceived support availability from the adolescents’ social network and structured clinic support groups. Stigma was measured using the ALHIV-SS scale, depression through the CDI short form and social support through items from the MOS-SS. RESULTS: Stigma was a risk factor for depression (B = 0.295; p < 001) and for suicidal thoughts and behaviour (B = 0.185; p < .001). Only perceived support availability was directly associated with less depression (B = −0.182, p < .001). However, both perceived support availability and support group participation contributed to the overall stress-buffering effects moderating the direct and indirect relationships between stigma and suicidal thoughts and behaviour. LIMITATIONS: The data used in this study was self-reported and cross-sectional. CONCLUSIONS: Findings suggest that strengthening multiple social support resources for HIV-positive adolescents, through early clinic and community-based interventions, may protect them from experiencing poor mental health and suicidal tendencies.