Intersecting Epidemics: Incident Syphilis and Drug Use in Women Living With Human Immunodeficiency Virus in the United States (2005-2016)

The burden of chlamydia, gonorrhea, and syphilis in older adults in the United States: A systematic review

BACKGROUND

Increases in life expectancy, the availability of sexual performance enhancing medication, and changes in sexual partnering suggest that sexually transmitted infections (STIs) among older persons could be on the rise, yet there have been relatively few studies examining STIs in this demographic. Our systematic review aimed to further characterize the incidence and prevalence of chlamydia, gonorrhea, and syphilis, along with associated risk factors among older adults (45 years or older) in the United States.

METHODS

We searched five electronic databases (PubMed, Embase, Cinahl, Web of Science, and Global Health) for data published from inception to January 2021. The retrieved articles were screened based on eligibility criteria, and subsequent review of relevant article bibliographies was conducted.

RESULTS

Of 4748 articles identified, 23 studies met our inclusion criteria and one additional article was identified through bibliography review. Of the 23 included articles, only 3 (11.5%) were focused exclusively on evaluating STIs in an older population. We found prevalence to be the following ranges: syphilis (0-18%), chlamydia (0-14.2%) and gonorrhea (0-15%). Few studies specifically investigated risk factors in this demographic.

CONCLUSIONS

The understudied burden of STIs in the older adult population substantiates the need to recognize issues surrounding sexuality in this demographic.

Multicenter Development and Validation of a Model for Predicting Retention in Care Among People with HIV

Predictive analytics can be used to identify people with HIV currently retained in care who are at risk for future disengagement from care, allowing for prioritization of retention interventions. We utilized machine learning methods to develop predictive models of retention in care, defined as no more than a 12 month gap between HIV care appointments in the Center for AIDS Research Network of Integrated Clinical Systems (CNICS) cohort. Data were split longitudinally into derivation and validation cohorts. We created logistic regression (LR), random forest (RF), and gradient boosted machine (XGB) models within a discrete-time survival analysis framework and compared their performance to a baseline model that included only demographics, viral suppression, and retention history. 21,267 Patients with 507,687 visits from 2007 to 2018 were included. The LR model outperformed the baseline model (AUC 0.68 [0.67-0.70] vs. 0.60 [0.59-0.62], P < 0.001). RF and XGB models had similar performance to the LR model. Top features in the LR model included retention history, age, and viral suppression.

Factors associated with syphilis seroprevalence in women with and at-risk for HIV infection in the Women's Interagency HIV Study (1994-2015)

OBJECTIVE

Syphilis rates among women in the USA more than doubled between 2014 and 2018. We sought to identify correlates of syphilis among women enrolled in the Women's Interagency HIV Study (WIHS) to inform targeted interventions.

METHODS

The retrospective cross-sectional analysis of secondary data included women with HIV or at-risk of HIV who enrolled in the multisite US WIHS cohort between 1994 and 2015. Syphilis screening was performed at baseline. Infection was defined serologically by a positive rapid plasma reagin test with confirmatory treponemal antibodies. Sociodemographic and behavioural characteristics stratified by baseline syphilis status were compared for women enrolled during early (1994-2002) and recent (2011-2015) years. Multivariable binomial modelling with backward selection (p>0.2 for removal) was used to model correlates of syphilis.

RESULTS

The study included 3692 women in the early cohort and 1182 women in the recent cohort. Syphilis prevalence at enrolment was 7.5% and 3.7% in each cohort, respectively (p<0.01). In adjusted models for the early cohort, factors associated with syphilis included age, black race, low income, hepatitis C seropositivity, drug use, HIV infection and >100 lifetime sex partners (all p<0.05). In the recent cohort, age (adjusted prevalence OR (aPOR) 0.2, 95% CI 0.1 to 0.6 for 30-39 years; aPOR 0.5, 95% CI 0.2 to 1.0 for 40-49 years vs ≥50 years), hepatitis C seropositivity (aPOR 2.1, 95% CI 1.0 to 4.1) and problem alcohol use (aPOR 2.2, 95% CI 1.1 to 4.4) were associated with infection.

CONCLUSIONS

Syphilis screening is critical for women with HIV and at-risk of HIV. Targeted prevention efforts should focus on women with hepatitis C and problem alcohol use.

Characterizing the role of intersecting stigmas and sustained inequities in driving HIV syndemics across low-to-middle-income settings

PURPOSE OF REVIEW

In 2020, key populations around the world still have disproportionate risks for HIV acquisition and experiencing HIV-related syndemics. This review presents current data around HIV-related syndemics among key populations globally, and on the role of intersecting stigmas in producing these syndemics in low-to-middle-income settings.

RECENT FINDINGS

Sex workers, sexual and gender minorities, prisoners, and people who use drugs experience high burdens of tuberculosis, sexually transmitted infections, viral hepatitis, and violence linked to heightened HIV-related risks or acquisition. Adverse sexual, reproductive, and mental health outcomes are also common and similarly amplify HIV acquisition and transmission risks, highlighting the need for psychosocial and reproductive health services for key populations.

SUMMARY

Achieving the promise of biomedical interventions to support HIV care and prevention requires action towards addressing syndemics of HIV, and the stigmas that reproduce them, among those most marginalized globally.