Intimate relationships and patterns of drug and sexual risk behaviors among people who inject drugs in Kazakhstan: A latent class analysis

Earlier sexual debut as a risk factor for substance use among men who have sex with men (MSM) in Kazakhstan

Background

Limited research have examined predictors of illicit use of drugs and binge drinking among gay, bisexual, and other men who have sex with men (MSM) in Kazakhstan and Central Asia. This study examines earlier sexual debut as a risk factor for lifetime and recent substance use behaviors among MSM in Kazakhstan.

Methods

We conducted a secondary analysis of self-reported data from a NIDA-funded HIV prevention trial including 902 adult cisgender MSM in Kazakhstan who completed structured screening interviews. Logistic regression models were used to estimate associations between earlier sexual debut (ages 16 and older as the reference group) and lifetime and recent substance use, with covariance adjustment for sociodemographic characteristics.

Results

The majority of MSM in our sample reported lifetime binge drinking behavior (73%) and illicit use of drugs (65%). Participants with an earlier sexual debut before 13 years old had significantly higher odds of lifetime binge drinking and any illicit use of drugs (aOR= 2.3, 95%CI: 1.2-4.5; aOR=3.0, 95%CI: 1.6-5.8). MSM who reported an earlier sexual debut between 13-15 years old had significantly higher odds of lifetime binge drinking and illicit use of any drugs (aOR=1.6, 95%CI: 1.1-2.3; aOR=1.6, 95%CI: 1.1-2.3); as well as recent binge drinking behavior (aOR=1.6, 95%CI: 1.2-2.3).

Conclusion

Future research should examine pathways between earlier sexual experiences and substance use behaviors among sexually diverse populations. Earlier sexual experiences during childhood and adolescence may be relevant contextual information for interventions aimed at substance use risk prevention, treatment, and recovery among MSM populations.

Polysubstance Use Profiles and HIV Viremia in a South African Cohort of Female Sex Workers: A Latent Class Analysis

BACKGROUND

Given intersecting social and structural factors, female sex workers (FSW) exhibit elevated risk of HIV and substance use. However, there is limited study of how distinct substance use typologies influence HIV treatment outcomes among FSW.

SETTING

A cross-sectional survey with objective viral load assessments of 1391 FSW enrolled into a treatment optimization-focused trial in Durban, South Africa (2018-2020).

METHODS

We used latent class analysis to uncover discrete patterns in past-month self-reported use of the following substances: heavy alcohol use, cannabis, cocaine, crack, ecstasy, methamphetamine, heroin, and Whoonga . We used Wald tests to identify multilevel predictors of latent class membership and multivariable mixture modeling to quantify associations of substance use classes with HIV viremia (≥50 RNA copies/mL).

RESULTS

Substance use (87%) and HIV viremia (62%) were highly prevalent. Latent class analysis uncovered 3 polysubstance use profiles: Heavy Alcohol Use Only (∼54%); Cannabis, Heavy Alcohol, & Crack Use (∼28%); and Whoonga & Crack Use (∼18%). Whoonga & Crack Use was associated with social and structural adversities, including homelessness, outdoor/public sex work, HIV stigma, and violence. Relative to Heavy Alcohol Use Only , HIV viremia was significantly higher in the Whoonga & Crack Use class (adjusted odds ratio 1.97, 95% confidence interval: 1.13 to 3.43), but not in the Cannabis, Heavy Alcohol, & Crack Use class (adjusted odds ratio 1.17, 95% confidence interval: 0.74 to 1.86).

CONCLUSION

HIV viremia differed significantly across identified polysubstance use profiles among South African FSW. Integrating drug treatment and harm reduction services into HIV treatment programs is key to improving virologic outcomes in marginalized communities.

The role of depression in secondary HIV transmission among people who inject drugs in Vietnam: A mathematical modeling analysis

BACKGROUND

Among people who inject drugs (PWID), depression burden is high and may interfere with HIV prevention efforts. Although depression is known to affect injecting behaviors and HIV treatment, its overall impact on HIV transmission has not been quantified. Using mathematical modeling, we sought to estimate secondary HIV transmissions and identify differences by depression among PWID.

METHODS

We analyzed longitudinal data from 455 PWID living with HIV in Vietnam during 2009-2013. Using a Bernoulli process model with individual-level viral load and behavioral data from baseline and 6-month follow-up visits, we estimated secondary HIV transmission events from participants to their potentially susceptible injecting partners. To evaluate differences by depression, we compared modeled transmissions per 1,000 PWID across depressive symptom categories (severe, mild, or no symptoms) in the three months before each visit.

RESULTS

We estimated a median of 41.2 (2.5th, 97.5th percentiles: 33.2-49.2) secondary transmissions from all reported acts of sharing injection equipment with 833 injecting partners in the three months before baseline. Nearly half (41%) of modeled transmissions arose from fewer than 5% of participants in that period. Modeled transmissions per 1,000 PWID in that period were highest for severe depressive symptoms (100.4, 80.6-120.2) vs. mild (87.0, 68.2-109.4) or no symptoms (78.9, 63.4-94.1). Transmission estimates fell to near-zero at the 6-month visit.

CONCLUSIONS

Secondary transmissions were predicted to increase with depression severity, although most arose from a small number of participants. Our findings suggest that effective depression interventions could have the important added benefit of reducing HIV transmission among PWID.

Association Between Dual Partnership and Sexual and Injecting Behaviors Among Persons Who Inject Drugs in 23 US Cities, 2018

Persons who inject drugs (PWID) engaging in receptive syringe sharing with their sex partner (dual partnership) may have different behavior patterns than people who have only sex or syringe sharing partnerships. PWID from 23 US cities were recruited for the National HIV Behavioral Surveillance in 2018 using respondent-driven sampling, interviewed, and tested for HIV. Log-linked Poisson regression was conducted to examine the associations between injecting and sexual behaviors and dual partnership. A total of 3435 PWID reported receptive syringe sharing and 42% engaged in dual partnership with their last sharing injecting partner. PWID who reported condomless vaginal or anal sex at last sex were more likely to engage in dual partnership (aPR = 1.85, 95% CI = 1.65-2.08). PWID who reported having two or more sex partners (aPR = 0.67, 95% CI = 0.62-0.72) or two or more sharing injecting partners (aPR = 0.54, 95% CI = 0.50-0.59) were less likely to engage in dual partnership. Findings suggest opportunities for tailored prevention intervention, including couple-based HIV testing, pre-exposure prophylaxis, and access to syringe services programs coupled with safer injection education to help reduce HIV risk.

Estimating the Effect of Depression on HIV Transmission Risk Behaviors Among People Who Inject Drugs in Vietnam: A Causal Approach

The burden of depression and HIV is high among people who inject drugs (PWID), yet the effect of depression on transmission risk behaviors is not well understood in this population. Using causal inference methods, we analyzed data from 455 PWID living with HIV in Vietnam 2009-2013. Study visits every 6 months over 2 years measured depressive symptoms in the past week and injecting and sexual behaviors in the prior 3 months. Severe depressive symptoms (vs. mild/no symptoms) increased injection equipment sharing (risk difference [RD] = 3.9 percentage points, 95% CI -1.7, 9.6) but not condomless sex (RD = -1.8, 95% CI -6.4, 2.8) as reported 6 months later. The cross-sectional association with injection equipment sharing at the same visit (RD = 6.2, 95% CI 1.4, 11.0) was stronger than the longitudinal effect. Interventions on depression among PWID may decrease sharing of injection equipment and the corresponding risk of HIV transmission.Clinical trial registration ClinicalTrials.gov NCT01689545.

Hepatitis B, hepatitis C and HIV prevalence and related sexual and substance use risk practices among key populations who access HIV prevention, treatment and related services in South Africa: findings from a seven-city cross-sectional survey (2017)

Background

People who use drugs including people who inject drugs (PWUD/ID), sex workers (SWs) and men who have sex with men (MSM) are at increased risk of HIV and viral hepatitis infection. Limited epidemiological data on the infections exists in key populations (KPs) in South Africa. We investigated the prevalence of hepatitis B (HBV), hepatitis C (HCV) and HIV and selected risk factors among these KPs to inform effective responses.

Methods

We used convenience sampling to recruit a targeted 3500 KPs accessing HIV-related health services across Cape Town (SWs, MSM, PWUD/ID), Durban (SWs, PWUD/ID), Pietermaritzburg (SWs), Mthatha (SWs), Port Elizabeth (SWs), Johannesburg (MSM) and Pretoria (MSM and PWUD/ID) into a cross-sectional survey. An interviewer questionnaire to assess socio-demographic characteristics, drug use and sexual risk practices, was administered. HBV surface antigen (HBsAg); HCV antibody, viral load and genotype, and HIV antibody, was tested.

Results

Among the 3439 people included in the study (1528 SWs, 746 MSM, 1165 PWUD/ID) the median age was 29 years, most participants were black African (60%), and 24% reported homelessness. 82% reported substance use in the last month, including alcohol (46%) and heroin (33%). 75% were sexually active in the previous month, with condom use at last sex at 74%. HIV prevalence was 37% (highest among SWs at 47%), HBsAg prevalence 4% (similar across KPs) and HCV prevalence was 16% (highest among PWUD/ID at 46%).

Conclusions

HBV, HCV and HIV pose a health burden for KPs in South Africa. While HIV is key for all included KPs, HCV is of particular importance to PWUD/ID. For KPs, HBV vaccination and behavioural change interventions that support consistent condom and lubricant access and use are needed. Coverage of opioid substitution therapy and needle and syringe services, and access to HCV treatment for PWUD/ID need to be expanded.