Correlates of Serodiscordant Condomless Anal Intercourse Among Virologically Detectable HIV-Positive Young Men Who Have Sex with Men

Syphilis testing and diagnosis among people with HIV engaged in care at four United States clinical sites, 2014-2018

BACKGROUND

Despite rising rates of syphilis among people with HIV (PWH) in the United States, there is no optimal syphilis screening frequency or prioritization.

METHODS

We reviewed records of all PWH in care between January 1, 2014 and November 16, 2018 from four sites in the CFAR Network of Integrated Clinical Systems Cohort (CNICS; N=8455). We calculated rates of syphilis testing and incident syphilis and used Cox proportional hazards models modified for recurrent events to examine demographic and clinical predictors of testing and diagnosis.

RESULTS

Participants contributed 29568 person-years of follow-up. The rate of syphilis testing was 118 tests per 100 person-years (95%CI: 117-119). The rate of incident syphilis was 4.7 cases per 100 person-years (95%CI: 4.5-5.0). Syphilis diagnosis rates were highest among younger cisgender MSM and transgender women, Hispanic individuals, people who inject drugs, and those with detectable HIV RNA, rectal infections, and hepatitis C.

CONCLUSION

We identified PWH who may benefit from more frequent syphilis testing and interventions for syphilis prevention.

Predictors of Condomless Anal Intercourse in Young HIV-Positive Men Who Have Sex With Men With Detectable Viral Loads

PURPOSE

A minority of young, gay, bisexual, and other men who have sex with men (YGBMSM) living with HIV in the U.S. achieve viral suppression, thus increasing the likelihood of viral transmission during condomless anal intercourse (CAI). The purpose of this study was to explore potential risk factors for CAI and serodiscordant CAI (SD-CAI) among YGBMSM with detectable viremia.

METHODS

A total of 146 YGBMSM (aged 16-24 years) with a detectable viremia enrolled in a mobile health adherence intervention. Baseline characteristics, stratified by any CAI and any SD-CAI (past 3 months), were computed. Random Forests and regression methods were used to assess factors associated with each type of CAI. Adjusted prevalence rate ratios (aPRR) and 95% confidence intervals (CIs) were calculated.

RESULTS

Half (51.9%) reported engaging in CAI; 57.1% of those reported SD-CAI. There was strong agreement between the Random Forests and regression methods. Significant risk factors of CAI included marijuana use (aPRR = 1.97, 95% CI: 1.21-3.21), problematic substance use (aPRR = 1.56, 95% CI: 1.11-2.20), and being in a committed relationship (aPRR = 1.66, 95% CI: 1.21-2.27). Only 47% believed they were less likely to transmit HIV through CAI when virally suppressed.

CONCLUSION

High rates of CAI, including engagement in SD-CAI in a population of YGBMSM with detectable viral loads, pose significant concerns for onward transmission. Individual, dyadic, and structural predictors of CAI were associated with engagement in risk in this priority population. Addressing these factors in concert with ensuring viral suppression will be key to ending the epidemic among youth.