Food insecurity and the risk of HIV acquisition: findings from population-based surveys in six sub-Saharan African countries (2016-2017)

Extreme Weather Events and Linkages with HIV Vulnerabilities Among Young Sex Workers and Sexually Diverse Men in Nairobi, Kenya: Qualitative Multi-method Insights

There is growing attention to the impacts of climate change and related extreme weather events (EWE) on HIV vulnerabilities, yet this research largely overlooks key populations such as sex workers and gay, bisexual, and other men who have sex with men (gbMSM). This is a critical knowledge gap in contexts that are greatly affected by climate change, EWE, and HIV, such as Kenya. To address this gap, this study examined the lived experiences of sex workers and gbMSM aged 18-24 in Nairobi, Kenya, regarding the relationships between climate change and EWE, resource insecurities (e.g., food, water), and HIV vulnerabilities. In 2023, we conducted a multi-method qualitative study in Nairobi, Kenya, including individual interviews using the SenseMaker web-based data collection tool and group digital storytelling workshops among 36 participants, including 21 sex workers and 15 gbMSM. Participant narratives aligned with the following themes highlighting the interconnections between EWE and HIV vulnerabilities: (1) EWE, specifically droughts and flooding, led directly and indirectly to resource scarcities and infrastructure damage; (2) participants enacted strategies to navigate resource scarcities, some of which increased HIV vulnerabilities (e.g., reduced condom agency, transactional sex engagement); (3) EWE and resource scarcities increased sexual violence risks; and (4) LGBTQ stigma exacerbated resource scarcities. Participants provided recommendations for multi-level strategies for HIV prevention, sexual health, and wellbeing for young sex workers and gbMSM in Kenya. Learning from young sex worker and gbMSM experiences can advance climate-informed HIV programming that addresses stigma, resource scarcities, and violence to advance sexual health and rights.

Socio-economic status and adherence to HIV preventive and therapeutic interventions: exploring the mediating role of food insecurity among men who have sex with men and transgender and non-binary persons from Brazil

INTRODUCTION

Brazil offers free-of-charge antiretroviral therapy (ART) for people living with HIV (PLWH) as well as oral pre-exposure prophylaxis (PrEP) through its national health system. Adherence to ART and to PrEP is essential to achieving the expected benefits of virologic suppression and prevention of HIV acquisition, respectively. Brazil has experienced worsening social inequalities, exacerbated by the COVID-19 pandemic, leading to increases in food insecurity especially among vulnerable populations. We explored whether food insecurity mediated the association of socio-economic status on adherence to ART/PrEP.

METHODS

Adult men who have sex with men (MSM) and transgender and non-binary persons (TGNB) living in Brazil (May-September/2021) voluntarily participated in a cross-sectional online study advertised on dating apps and social media. Participants living with HIV reporting ART use and participants with HIV-negative status reporting daily oral PrEP use were eligible for the analysis. Self-report of ART adherence was measured by the WebAd-Q instrument (3-items/past week) plus a visual analogue scale. Self-report of PrEP adherence was measured by the number of days the person took PrEP in the past week. The 8-item Brazilian Scale of Food Insecurity (EBIA) was used to measure food insecurity (higher scores indicate more severe food insecurity). Two structural equation models were used to assess the direct and indirect effects of variables on ART adherence among PLWH and on PrEP adherence among people using PrEP.

RESULTS

In total, 1230 PLWH were using ART, and 991 individuals with HIV-negative status were using daily oral PrEP. The median age of PLWH was 37 years (HIV negative: 34 years), most were cismen (98%). More PLWH reported moderate/severe food insecurity (21.7%; HIV negative: 12.9%). Self-report of ART adherence (measured by WebAd-Q, past 7 days) was 55.7% (PrEP adherence: 93.3%). In the two models, socio-economic status had an effect on adherence that was mediated through food insecurity: higher socio-economic status was associated with lower food insecurity, and higher food insecurity was associated with lower adherence.

CONCLUSIONS

Our findings suggest that the provision of socio-economic support could help PLWH and people at higher vulnerability to HIV acquisition by improving their adherence to ART or PrEP, and ultimately populations through decreased HIV transmissions.

Profiles of Sexual Economic Exchanges among Women in Kisumu, Kenya: A Latent Class Analysis

Sexual economic exchanges, including sex work and transactional sex, have been consistently associated with HIV acquisition among young women in sub-Saharan Africa. Heterogeneity in HIV vulnerability across overlapping types of sexual economic exchange has not been sufficiently explored, limiting appropriate and effective linkage to prevention interventions. From January 2017 to May 2018, cross-sectional data were captured at screening for entry into an HIV incidence cohort in Kisumu, Kenya. Men and women aged 18-35 years completed a socio-behavioral questionnaire. Latent class analysis was used to classify sexually active women into discrete groups based on self-identification of occupational sex and other sexual exchanges, including exchange for money, gifts, food, school fees, substances, shelter/rent, and/or clothing. Profiles examined characteristics within and across typologies. Mixed logistic regression models assessed demographic and socio-behavioral characteristics associated with probabilistic class membership. A total of 1063 participants were screened, of whom 536 (50.4%) were sexually active women (median age: 27 years [interquartile range 23-30]). Sexual economic exchange was reported by 403 (77.2%) sexually active women, who most commonly reported recent exchange of sex for money (73.9%), gifts (19.6%), food (25.9%), and substances (17.7%); 44.6% reported selling sex as a primary or secondary occupation. Three profiles of sexual economic exchange were identified, each with distinct demographic, behavioral, and occupational characteristics: exchange for money and other necessities (23.3% prevalence), exchange for primarily money (38.2% prevalence), and sex comprising limited or no exchange (38.4% prevalence). In mixture modeling, as compared to limited or no exchange, exchange for money and other necessities, and exchange for primarily money were both associated with increased age, higher number of partners, and partners at least 10 years older. Heterogeneous patterns of sexual economic exchange were observed among women in Kenya reflect the different motivations and pathways by which women exchange sex. Female sex workers are often considered a homogeneous group, but these data highlight the need for differentiated services based on the diverse needs of women who engage in sexual economic exchange.

Transactional sex and age-disparate sexual partnerships among adolescent girls and young women in Tanzania

Introduction

Adolescent girls and young women (AGYW) continue to experience a high incidence of HIV in southern and eastern Africa, even in the context of large-scale HIV prevention interventions. In Tanzania, AGYW account for the largest proportion of new infections and have a higher risk of HIV acquisition than males of comparable age.

Methods

We used routinely collected data from the PEPFAR/USAID-funded Sauti Project, a large combination HIV prevention program, to examine the relationship between transactional sex and sex with older partners among AGYW in Tanzania (2015-2020). Out-of-school AGYW 15-24 years completed a vulnerability index and were tested for HIV. We estimated weighted prevalence ratios (PR) and 95% confidence intervals (CI) for the associations of transactional sex (sex exchanged for money/services/gifts outside of sex work) and sex with older partners (≥5-years older, ≥10-years older) with prevalent HIV. Age cutoffs of 5 and 10 years were used to align partner age differences with age-disparate and intergenerational sex, respectively. We assessed potential synergism between exposures, and subgroup analyses explored associations among girls 15-19.

Results

Sixty seven thousand three hundred fifty seven AGYW completed the vulnerability index and 14,873 had captured HIV testing records. Median age was 20 years (IQR 18-22). Transactional sex and age-disparate sex were common (35% and 28%, respectively); 13% of AGYW reported both behaviors. HIV prevalence was associated with both transactional sex (PR: 1.28; 95% CI 1.00-1.63) and age-disparate sex (PR:1.26, 95% CI 0.99-1.60). In common referent analysis, transactional sex remained strongly associated with HIV, even in the absence of age-disparate sex (PR 1.41; 95% CI 1.02-1.94).

Discussion

Evidence of statistical synergism was not present, suggesting both transactional sex and age-disparate sex operate through similar pathways to increase HIV risk. Increased specificity within HIV prevention programs is needed to better meet the sexual and reproductive health needs of AGYW at high risk of HIV in Tanzania, including investment in tailored youth-friendly strategies for AGYW who have been marginalized from the current HIV response.

Self-reported uptake of STI testing services among adolescents and young people aged 15-24 years: Findings from the Yathu Yathu cluster randomized trial in Lusaka, Zambia

There is little evidence regarding community-based delivery of STI testing and treatment for youth aged 15-24 (AYP) in Zambia. In a cluster-randomised trial, we evaluated whether offering syndromic STI screening through community-based, peer-led sexual and reproductive health services (Yathu Yathu) with referral to a local health facility for testing, increased self-reported testing for STIs (other than HIV) among AYP. Two communities in Lusaka were divided into 10 zones each (20 zones in total); by community, zones were randomly allocated (1:1) to Yathu Yathu or control. Monitoring data were used to describe syndromic STI screening through Yathu Yathu and an endline cross-sectional survey used to evaluate the impact of Yathu Yathu on self-reported ever and recent (last 12 months) STI testing. 10,974 AYP accessed Yathu Yathu; 66.6% (females-67.7%; males-64.7%) were screened for STIs, 6.2% reported any STI symptoms. In the endline survey, 23.3% (n = 350/1501) of AYP who ever had sex ever STI tested; 13.5% (n = 174/1498) who had sex in the last 12 months recently STI tested. By trial arm, there was no difference in self-reported ever or recent STI testing among all AYP. Among men aged 20-24, there was evidence that ever STI testing was higher in the Yathu Yathu compared to control arm (24.1% vs 16.1%; adjPR = 1.67 95%CI = 1.02, 2.74; p = 0.04). Among AYP who ever STI tested, 6.6% (n = 23) reported ever being diagnosed with an STI. Syndromic STI management through community-based, peer-led services showed no impact on self-reported STI testing among AYP. Research on community-based delivery of (near) point-of-care diagnostics is needed. Trial registration number(s): NCT04060420 https://clinicaltrials.gov/ct2/show/NCT04060420; and ISRCTN75609016; https://doi.org/10.1186/ISRCTN75609016.

HIV-sensitive social protection for unemployed and out-of-school young women in Botswana: An exploratory study of barriers and solutions

Promotive social protection programs aim to increase income and capabilities and could help address structural drivers of HIV-vulnerability like poverty, lack of education and gender inequality. Unemployed and out-of-school young women bear the brunt of HIV infection in Botswana, but rarely benefit from such economic empowerment programs. Using a qualitative exploratory study design and a participatory research approach, we explored factors affecting perceived program benefit and potential solutions to barriers. Direct stakeholders (n = 146) included 87 unemployed and out-of-school young women and 59 program and technical officers in five intervention districts. Perceived barriers were identified in 20 semi-structured interviews (one intervention district) and 11 fuzzy cognitive maps. Co-constructed improvement recommendations were generated in deliberative dialogues. Analysis relied on Framework and the socioecological model. Overall, participants viewed existing programs in Botswana as ineffective and inadequate to empower vulnerable young women socially or economically. Factors affecting perceived program benefit related to programs, program officers, the young women, and their social and structural environment. Participants perceived barriers at every socioecological level. Young women's lack of life and job skills, unhelpful attitudes, and irresponsible behaviors were personal-level barriers. At an interpersonal level, competing care responsibilities, lack of support from boyfriends and family, and negative peer influence impeded program benefit. Traditional venues for information dissemination, poverty, inequitable gender norms, and lack of coordination were community- and structural-level barriers. Improvement recommendations focused on improved outreach and peer approaches to implement potential solutions. Unemployed and out-of-school young women face multidimensional, interacting barriers that prevent benefit from available promotive social protection programs in Botswana. To become HIV-sensitive, these socioeconomic empowerment programs would need to accommodate or preferentially attract this key population. This requires more generous and comprehensive programs, a more client-centered program delivery, and improved coordination. Such structural changes require a holistic, intersectoral approach to HIV-sensitive social protection.

The state of the pediatric HIV epidemic in Lesotho

OBJECTIVE

Lesotho does not have reliable data on HIV prevalence in children, relying on estimates generated from program data. The 2016 Lesotho Population-based HIV Impact Assessment (LePHIA) aimed to determine HIV prevalence among children 0-14 years to assess the effectiveness of the prevention of mother-to-child transmission (PMTCT) program and guide future policy.

METHODS

A nationally representative sample of children under 15 years underwent household-based, two-stage HIV testing from November 2016-May 2017. Children <18 months with a reactive screening test were tested for HIV infection using total nucleic acid (TNA) PCR. Parents (61.1%) or legal guardians (38.9%) provided information on children's clinical history. Children aged 10-14 years also answered a questionnaire on knowledge and behaviors.

RESULTS

HIV prevalence was 2.1% [95% confidence interval (CI): 1.5-2.6]. Prevalence in 10-14 year olds (3.2%; 95% CI: 2.1, 4.2) was significantly greater compared to 0-4 year olds (1.0%; 95% CI: 0.5, 1.6). HIV prevalence in girls and boys was 2.6% (95% CI: 1.8-3.3) and 1.5% (95% CI: 1.0-2.1), respectively. Based on reported status and/or the presence of detectable antiretrovirals, 81.1% (95% CI: 71.7-90.4) of HIV-positive children were aware of their status, 98.2% (95% CI: 90.7-100.0) of those aware were on antiretroviral therapy (ART) and 73.9% (95% CI: 62.1-85.8) of those on ART were virally suppressed.

CONCLUSIONS

Despite the roll-out of Option B+ in Lesotho in 2013, pediatric HIV prevalence remains high. Further research is required to understand the greater prevalence among girls, barriers to PMTCT, and how to better achieve viral suppression in children with HIV.

Pharmacokinetic serum concentrations of VRC01 correlate with prevention of HIV-1 acquisition

BACKGROUND

The phase 2b proof-of-concept Antibody Mediated Prevention (AMP) trials showed that VRC01, an anti-HIV-1 broadly neutralising antibody (bnAb), prevented acquisition of HIV-1 sensitive to VRC01. To inform future study design and dosing regimen selection of candidate bnAbs, we investigated the association of VRC01 serum concentration with HIV-1 acquisition using AMP trial data.

METHODS

The case-control sample included 107 VRC01 recipients who acquired HIV-1 and 82 VRC01 recipients who remained without HIV-1 during the study. We measured VRC01 serum concentrations with a qualified pharmacokinetic (PK) Binding Antibody Multiplex Assay. We employed nonlinear mixed effects PK modelling to estimate daily-grid VRC01 concentrations. Cox regression models were used to assess the association of VRC01 concentration at exposure and baseline body weight, with the hazard of HIV-1 acquisition and prevention efficacy as a function of VRC01 concentration. We also compared fixed dosing vs. body weight-based dosing via simulations.

FINDINGS

Estimated VRC01 concentrations in VRC01 recipients without HIV-1 were higher than those in VRC01 recipients who acquired HIV-1. Body weight was inversely associated with HIV-1 acquisition among both placebo and VRC01 recipients but did not modify the prevention efficacy of VRC01. VRC01 concentration was inversely correlated with HIV-1 acquisition, and positively correlated with prevention efficacy of VRC01. Simulation studies suggest that fixed dosing may be comparable to weight-based dosing in overall predicted prevention efficacy.

INTERPRETATION

These findings suggest that bnAb serum concentration may be a useful marker for dosing regimen selection, and operationally efficient fixed dosing regimens could be considered for future trials of HIV-1 bnAbs.

FUNDING

Was provided by the National Institutes of Health, National Institute of Allergy and Infectious Diseases (NIAID) (UM1 AI068614, to the HIV Vaccine Trials Network [HVTN]; UM1 AI068635, to the HVTN Statistical Data and Management Center [SDMC], Fred Hutchinson Cancer Center [FHCC]; 2R37 054165 to the FHCC; UM1 AI068618, to HVTN Laboratory Center, FHCC; UM1 AI068619, to the HPTN Leadership and Operations Center; UM1 AI068613, to the HIV Prevention Trials Network [HPTN] Laboratory Center; UM1 AI068617, to the HPTN SDMC; and P30 AI027757, to the Center for AIDS Research, Duke University (AI P30 AI064518) and University of Washington (P30 AI027757) Centers for AIDS Research; R37AI054165 from NIAID to the FHCC; and OPP1032144 CA-VIMC Bill & Melinda Gates Foundation.

Vulnerable young women and frontline service providers identify options to improve the HIV-sensitivity of social protection programmes in Botswana: A modified Policy Delphi approach

Poverty, lack of education and gender inequality make unemployed and out-of-school young women extremely vulnerable to HIV infection. Promotive social protection programmes aim to increase livelihood and capabilities and could empower this priority population to act on HIV prevention choices. In Botswana, they rarely benefit from such programmes.A modified Policy Delphi engaged a panel of 22 unemployed and out-of-school young women and eight frontline service providers to consider alternative policy and practice options, and tailor available programmes to their own needs and social situation. The panel assessed the desirability and feasibility of improvement proposals and, in a second round, ranked them for relative importance.Nearly all 40 improvement proposals were considered very desirable and definitely, or possibly, feasible, and panellists prioritised a wide range of proposals. Frontline service providers stressed foundational skills, like life skills and second chance education. Young women preferred options with more immediate benefits. Overall, panellists perceived positive role models for programme delivery, access to land and water, job skills training, and stipends as most important to empower HIV-vulnerable young women. Results suggest ample policy space to make existing social protection programmes in Botswana more inclusive of unemployed and out-of-school young women, hence more HIV-sensitive.