HIV intertest interval among MSM in King County, Washington

HIV Testing Strategies for Health Departments to End the Epidemic in the U.S

An important goal of the Ending the HIV Epidemic in the U.S. initiative is the timely diagnosis of all people with HIV as early as possible after infection. To end the HIV epidemic, health departments were encouraged to propose new and innovative HIV testing strategies and improve the reach of existing programs. These activities were divided into 3 core strategies: expansion of routine screening in healthcare settings, locally tailored HIV testing initiatives in nonhealthcare settings, and specific efforts to increase the frequency of testing for individuals with increased potential for acquiring HIV. Because HIV testing is such a crucial part of the core activities of the Centers for Disease Control and Prevention's HIV prevention programs, there are many examples of evidence-based programs and best practices for HIV testing in both clinical and nonclinical settings. This article reviews the evidence base for these strategies and some of the activities proposed under the Diagnose pillar to achieve the goal of diagnosing all HIV infections as early as possible. All other Ending the HIV Epidemic in the U.S. activities start with an awareness of HIV status, which is actually the indicator for which most health departments are closest to the proposed targets. There are both proven and emerging approaches to increasing HIV screening and increasing the frequency of HIV screening available. The Ending the HIV Epidemic in the U.S. initiative provides the motivation, the resources, and a coordinated plan to bring them to scale.

Predictors of First-Time and Repeat HIV Testing Among HIV-Positive Individuals in Kenya

BACKGROUND

Despite a doubling of HIV testing coverage in Kenya over the past decade, approximately 2 in 10 people with HIV remained unaware of their infection in 2018. HIV testing is most effective in identifying people with undiagnosed HIV through frequent and strategic testing in populations at high risk. An assessment of testing frequency and predictors of first-time and repeat testing is critical for monitoring effectiveness of testing strategies.

METHODS

We conducted a cross-sectional analysis of adults aged ≥18 years who tested HIV-positive at 4 HIV testing and counseling clinics in Kenya from February 2015 to February 2016. We categorized individuals based on testing history, used Wilcoxon rank-sum tests to assess differences in intervals between the most recent and current HIV test, and used log-binomial regression to determine characteristics associated with first-time and repeat testing.

RESULTS

Among 1136 people testing HIV-positive, 336 (30%) had never tested before and 800 (70%) had, of whom 208 (26%) had previously tested positive. Among previously negative repeat testers, the median intertest interval was 414 days in key/priority populations (interquartile range = 179-1072) vs. 538 in the general population (interquartile range = 228-1299) (P = 0.09). Compared with previously negative repeat testers, being a first-time tester was associated with being age ≥40 years [vs. 18-24; adjusted risk ratio = 1.67, 95% confidence interval (CI): 1.23 to 2.26], men (vs. women; adjusted risk ratio = 1.45, 95% CI: 1.21 to 1.71), and testing through provider-initiated testing and counseling (vs. client initiated; 1.19, 95% CI: 1.00 to 1.40).

CONCLUSIONS

There is a need to increase HIV testing among older individuals and men, increase testing frequency in key/priority populations, and maintain provider-initiated and facility-based testing to reach first-time testers.

Using Digital Communication Technology to Increase HIV Testing Among Men Who Have Sex With Men and Transgender Women: Systematic Review and Meta-Analysis

BACKGROUND

HIV continues to disproportionately affect men who have sex with men (MSM) and transgender women (TW). Undiagnosed HIV is a major driver of HIV transmission rates, and increasing the uptake of regular HIV testing and facilitating timely initiation of HIV treatment is a global HIV prevention priority. However, MSM and TW experience a range of barriers that limit their access to testing and other prevention services. Given their growing ubiquity, digital communication technologies are increasingly being used to support HIV prevention efforts, and a growing number of studies have trialed the use of digital technology to promote HIV testing among MSM and TW.

OBJECTIVE

We undertook a systematic review and meta-analysis to assess the impact of digital communication technology on HIV testing uptake among MSM and TW. Subanalyses aimed to identify the features and characteristics of digital interventions associated with greater impact.

METHODS

A systematic literature review was undertaken using select databases and conference repositories. Studies describing the use of a digital technology-internet-enabled devices, including phones, tablets, and computers-to increase HIV testing uptake among MSM or TW using either randomized or observational cohort design with measurement of HIV testing rates measured pre- and postintervention, and published in English between 2010 and 2018 were included. Pooled effect estimates were calculated using a random effects meta-analysis. Subanalyses calculated effect estimates grouped by selected features of digital interventions.

RESULTS

A total of 13 randomized or observational studies were included in the final review. Digital interventions most commonly used mainstream, existing social media platforms (n=7) or promotion through online peer educators (n=5). Most interventions (n=8) were categorized as interactive and allowed user engagement and most directly facilitated testing (n=7) either by providing self-testing kits or referral to testing services. A total of 1930 participants were included across the 13 studies. HIV testing uptake among MSM and TW exposed to digital interventions was 1.5 times higher than that of unexposed MSM and TW (risk ratio [RR] 1.5; 95% CI 1.3-1.7). Subanalyses suggested an increased impact on HIV testing uptake among interventions that were delivered through mainstream social media-based platforms (RR 1.7; 95% CI 1.3-2.1), included direct facilitation of HIV testing (RR 1.6; 95% CI 1.4-1.9), were interactive (RR 1.6; 95% CI 1.4-1.8), and involved end users in the design process (RR 1.6; 95% CI 1.3-2.0).

CONCLUSIONS

These findings provide broad support for the integration of technology with existing approaches to promote and facilitate HIV testing among MSM and TW. Our findings identified key features that may be associated with greater impact on HIV testing uptake and can be used to inform future development efforts given the growing interest and application of digital technologies in HIV prevention.

TRIAL REGISTRATION

PROSPERO International Prospective Register of Systematic Reviews CRD42017070055; https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42017070055.

Uptake and Impact of Short Message Service Reminders via Sexually Transmitted Infection Partner Services on Human Immunodeficiency Virus/Sexually Transmitted Infection Testing Frequency Among Men Who Have Sex With Men

BACKGROUND

Sexually transmitted infection (STI) partner services (PS) allow provision of human immunodeficiency virus (HIV)/STI prevention interventions to high-risk individuals, including testing reminders via short message service (SMS).

METHODS

In King County, Washington, PS attempt to reach all men who have sex with men (MSM) with early syphilis and those with gonorrhea or chlamydia as resources allow. Since 2013, PS offered quarterly SMS testing reminders. We evaluated correlates of reminder uptake and the association between reminder uptake and postinterview asymptomatic STI diagnosis using Poisson regression, and the association between preinterview SMS reminder use and intertest interval among HIV-negative MSM using median regression.

RESULTS

During July 1, 2013 to January 17, 2018, 8236 MSM were reported with 1 or more STI diagnoses and 5237 received PS interviews. Of these, 4087 (78%) were offered SMS reminders; 545 (13%) accepted, 265 (7%) were already receiving SMS, 3277 (80%) refused. Of 2602 patients who refused and were asked about other reminders, 37% used none, 16% received reminders from medical providers, 20% tested at routine physicals, and 26% used other reminders. SMS reminder use before and after PS interview was associated with negative HIV status, younger age, and diagnosis with gonorrhea or chlamydia (vs. syphilis) (P < 0.05 for all). Preinterview intertest interval was longer among MSM testing at physicals (9.6 months) than those using no reminder (5.6), SMS reminders (4.7, P < 0.05 vs. physicals), and non-SMS reminders (3.6, P < 0.001 vs. SMS). Reminder uptake was not associated with postinterview STI diagnosis.

CONCLUSIONS

Offering SMS reminders through STI PS is feasible. Uptake was low, but higher among young MSM not on preexposure prophylaxis. The SMS reminders may increase testing frequency.

A cohort study comparing rate of repeat testing for sexually transmitted and blood-borne infections between clients of an internet-based testing programme and of sexually transmitted infection clinics in Vancouver, Canada

OBJECTIVES

Internet-based sexually transmitted and blood-borne infection (STBBI) testing services reduce testing barriers through bypassing face-to-face clinical encounters, potentially enabling clients at ongoing sexual risk to test more frequently. To our knowledge, this hypothesis has not been previously tested. We compared the frequency of repeat testing between Vancouver-based clients of GetCheckedOnline (GCO)-an internet-based STBBI testing service in British Columbia, Canada-and clients of three sexually transmitted infection (STI) clinics in Vancouver for 29 months after GCO launched.

METHODS

An administrative data cohort (n=19 497) was assembled using GCO, clinical and laboratory databases. We included all individuals who tested for HIV, gonorrhoea/chlamydia, syphilis or hepatitis C at three STI clinics or using GCO, between September 2014 and February 2017. The rate of repeat testing (>30 days after first episode) was compared between clients who used GCO at least once and those who tested only in STI clinics. Poisson regression was used to generate relative rate (RR) for repeat testing, with adjustment for age, gender/sexual orientation, risk factors (eg, history of STI diagnosis) and rate of testing before GCO launched.

RESULTS

1093 GCO clients were identified, of whom 434 (40%) had repeat test episodes; 8200/18 404 (45%) of clinic clients tested more than once. During the 29-month analysis period, GCO clients repeat tested 1.87 times per person-year, whereas clinic clients repeat tested 1.53 times per person-year, resulting in a crude RR of 1.22 (95% CI: 1.14 to 1.31). Adjustment for covariates increased the RR to 1.26 (95% CI: 1.15 to 1.37).

CONCLUSIONS

In this cohort, individuals using internet-based STBBI testing had a rate of repeat testing 22% greater than clinic-based clients. This effect was increased after adjusting for characteristics associated with higher test frequency. The online interface of GCO may facilitate more frequent testing and may therefore contribute to earlier STBBI diagnosis.

HIV Self-Testing Increases HIV Testing Frequency in High-Risk Men Who Have Sex With Men: A Randomized Controlled Trial

BACKGROUND

Self-testing may increase HIV testing and decrease the time people with HIV are unaware of their status, but there is concern that absence of counseling may result in increased HIV risk.

SETTING

Seattle, Washington.

METHODS

We randomly assigned 230 high-risk HIV-negative men who have sex with men to have access to oral fluid HIV self-tests at no cost versus testing as usual for 15 months. The primary outcome was self-reported number of HIV tests during follow-up. To evaluate self-testing's impact on sexual behavior, we compared the following between arms: non-HIV-concordant condomless anal intercourse and number of male condomless anal intercourse partners in the last 3 months (measured at 9 and 15 months) and diagnosis with a bacterial sexually transmitted infection (STI: early syphilis, gonorrhea, and chlamydial infection) at the final study visit (15 months). A post hoc analysis compared the number of STI tests reported during follow-up.

RESULTS

Men randomized to self-testing reported significantly more HIV tests during follow-up (mean = 5.3, 95% confidence interval = 4.7 to 6.0) than those randomized to testing as usual (3.6, 3.2 to 4.0; P < 0.0001), representing an average increase of 1.7 tests per participant over 15 months. Men randomized to self-testing reported using an average of 3.9 self-tests. Self-testing was noninferior with respect to all markers of HIV risk. Men in the self-testing arm reported significantly fewer STI tests during follow-up (mean = 2.3, 95% confidence interval = 1.9 to 2.7) than men in the control arm (3.2, 2.8 to 3.6; P = 0.0038).

CONCLUSIONS

Access to free HIV self-testing increased testing frequency among high-risk men who have sex with men and did not impact sexual behavior or STI acquisition.

HIV diagnoses and testing patterns among young gay, bisexual and other men who have sex with men: an analysis of HIV surveillance data in British Columbia, 2008-2015

BACKGROUND

We examined changes in HIV testing indicators following a recent increase in diagnoses among young gay, bisexual and other men who have sex with men (GBMSM) in BC that accompanied implementation of a provincial HIV strategy.

METHOD

Surveillance and laboratory testing data were used to compare case counts and testing characteristics among GBMSM < 30 and ≥ 30 years diagnosed in 2008-2011 and 2012-2015. We tested differences in the proportion diagnosed on first testing episode, proportion diagnosed at late stage of infection and the median inter-test interval ((ITI) time in months between last negative test and first positive test) using χ² and Wilcoxon rank-sum tests.

RESULTS

In 2008-2011, 657 diagnoses were made among GBMSM: 24% among men < 30 years and 76% among men ≥ 30 years. In 2012-2015, 590 diagnoses were made: 28% among < 30 years and 28% among ≥ 30 years. Among men < 30 years, diagnoses made on first testing episode decreased (39.4% vs. 28.7% in 2012-2015; p = 0.042) and there were few late-stage diagnoses (5.1% in 2008-2011 vs. 9.1% in 2012-2015). The median ITI was 10 months in both periods. No changes were observed over time among men ≥ 30 years. However, in both periods, late-stage diagnosis was more common in men ≥ 30 years (2008-2011, 18.8%; 2012-2015, 18.6%; p < 0.01 for both). The ITI was also longer for men ≥ 30 years (2008-2011, 24.5 months; 2012-2015, 20 months; p < 0.001 for both).

CONCLUSION

Testing indicators suggested better testing practices among GBMSM diagnosed at < 30 years compared to those diagnosed at older ages. However, there are clear needs for additional prevention measures in both age groups.

Development of an Agent-Based Model to Investigate the Impact of HIV Self-Testing Programs on Men Who Have Sex With Men in Atlanta and Seattle

BACKGROUND

In the United States HIV epidemic, men who have sex with men (MSM) remain the most profoundly affected group. Prevention science is increasingly being organized around HIV testing as a launch point into an HIV prevention continuum for MSM who are not living with HIV and into an HIV care continuum for MSM who are living with HIV. An increasing HIV testing frequency among MSM might decrease future HIV infections by linking men who are living with HIV to antiretroviral care, resulting in viral suppression. Distributing HIV self-test (HIVST) kits is a strategy aimed at increasing HIV testing. Our previous modeling work suggests that the impact of HIV self-tests on transmission dynamics will depend not only on the frequency of tests and testers' behaviors but also on the epidemiological and testing characteristics of the population.

OBJECTIVE

The objective of our study was to develop an agent-based model to inform public health strategies for promoting safe and effective HIV self-tests to decrease the HIV incidence among MSM in Atlanta, GA, and Seattle, WA, cities representing profoundly different epidemiological settings.

METHODS

We adapted and extended a network- and agent-based stochastic simulation model of HIV transmission dynamics that was developed and parameterized to investigate racial disparities in HIV prevalence among MSM in Atlanta. The extension comprised several activities: adding a new set of model parameters for Seattle MSM; adding new parameters for tester types (ie, regular, risk-based, opportunistic-only, or never testers); adding parameters for simplified pre-exposure prophylaxis uptake following negative results for HIV tests; and developing a conceptual framework for the ways in which the provision of HIV self-tests might change testing behaviors. We derived city-specific parameters from previous cohort and cross-sectional studies on MSM in Atlanta and Seattle. Each simulated population comprised 10,000 MSM and targeted HIV prevalences are equivalent to 28% and 11% in Atlanta and Seattle, respectively.

RESULTS

Previous studies provided sufficient data to estimate the model parameters representing nuanced HIV testing patterns and HIV self-test distribution. We calibrated the models to simulate the epidemics representing Atlanta and Seattle, including matching the expected stable HIV prevalence. The revised model facilitated the estimation of changes in 10-year HIV incidence based on counterfactual scenarios of HIV self-test distribution strategies and their impact on testing behaviors.

CONCLUSIONS

We demonstrated that the extension of an existing agent-based HIV transmission model was sufficient to simulate the HIV epidemics among MSM in Atlanta and Seattle, to accommodate a more nuanced depiction of HIV testing behaviors than previous models, and to serve as a platform to investigate how HIV self-tests might impact testing and HIV transmission patterns among MSM in Atlanta and Seattle. In our future studies, we will use the model to test how different HIV self-test distribution strategies might affect HIV incidence among MSM.

Evaluating the Evidence for More Frequent Than Annual HIV Screening of Gay, Bisexual, and Other Men Who Have Sex With Men in the United States: Results From a Systematic Review and CDC Expert Consultation

The Centers for Disease Control and Prevention (CDC) recommended in 2006 that sexually active gay, bisexual, and other men who have sex with men (MSM) be screened for human immunodeficiency virus (HIV) at least annually. A workgroup comprising CDC and external experts conducted a systematic review of the literature, including benefits, harms, acceptability, and feasibility of annual versus more frequent screening among MSM, to determine whether evidence was sufficient to change the current recommendation. Four consultations with managers of public and nonprofit HIV testing programs, clinics, and mathematical modeling experts were conducted to provide input on the programmatic and scientific evidence. Mathematical models predicted that more frequent than annual screening of MSM could prevent some new HIV infections and would be more cost-effective than annual screening, but this evidence was considered insufficient due to study design. Evidence supports CDC's current recommendation that sexually active MSM be screened at least annually. However, some MSM might benefit from more frequent screening. Future research should evaluate which MSM subpopulations would benefit most from more frequent HIV screening.

Achieving the Goals of the National HIV/AIDS Strategy: Declining HIV Diagnoses, Improving Clinical Outcomes, and Diminishing Racial/Ethnic Disparities in King County, WA (2004-2013)

BACKGROUND

The US National HIV/AIDS Strategy defines national objectives related to HIV prevention and care. The extent to which US cities are meeting those objectives is uncertain.

METHODS

We analyzed King County, WA, HIV surveillance data collected between 2004 and 2013. The study population included 9539 persons diagnosed as having and living with HIV infection and 3779 persons with newly diagnosed HIV infection.

RESULTS

Between 2004 and 2013, the rate of new HIV diagnosis decreased from 18.4 to 13.2 per 100,000 residents (decline of 28%); AIDS diagnosis rates declined 42% from 12 to 7 per 100,000; and age-adjusted death rates decreased from 27 to 15 per 1000 persons living with HIV/AIDS (decline of 42%; P<0.0001 for all 3 trends). The rate of new HIV diagnosis declined 26% among men who have sex with men (MSM; P=0.0002), with the largest decline occurring in black MSM (44%). Among 8679 individuals with laboratory results reported to National HIV Surveillance System from 2006 through 2013, viral suppression (viral load<200 copies/mL) increased from 45% to 86% (P<0.0001), with all racial/ethnic groups achieving greater than 80% viral suppression in 2013.

INTERPRETATION

The rates of new HIV diagnosis, AIDS diagnoses, and mortality in persons living with HIV in King County, WA, have significantly declined over the last decade. These changes have occurred concurrent with a dramatic increase in HIV viral suppression and have affected diverse populations, including MSM and African American MSM. These findings demonstrate substantial local success in achieving the goals of the National HIV/AIDS Strategy.

Estimated HIV Inter-test Interval Among People at High Risk for HIV Infection in the U.S

INTRODUCTION

Knowing the HIV testing frequency and its temporal changes are central to evaluate public adherence to HIV testing recommendations and performance of HIV prevention programs. This study intended to estimate the mean HIV inter-test interval (ITI) and monitor its trends among men who have sex with men (MSM); people who inject drugs (PWID); and high-risk heterosexuals (HRH).

METHODS

Using National HIV Behavioral Surveillance data collected during 2008-2015, this analysis estimated the mean HIV ITI for each year by race/ethnicity and age among MSM, PWID, and HRH who reported the most recent HIV test date. Separate statistical models based on renewal process theory were fit using PROC NLIN with Newton-Raphson method. Estimated mean HIV ITI lengths were compared using the z-test.

RESULTS

Estimated HIV ITI generally decreased in the past decade among MSM, PWID, and HRH who reported the most recent HIV test date. In most recent study years, estimated HIV ITI (in months) ranged from 5.8 to 12.5 among MSM, from 9.0 to 13.1 among PWID, and from 15.3 to 26.7 among HRH. Within each risk group, estimated HIV ITI was shortest among blacks and individuals aged 18-24 years.

CONCLUSIONS

People at high risk for HIV infection who ever tested for HIV tested more frequently in the past decade. Most recently, MSM and PWID largely adhered to the Centers for Disease Control and Prevention's HIV testing recommendations, but HRH tested less frequently. Identifying factors associated with infrequent testing among HRH may provide information for future HIV testing initiatives.

Routine HIV testing in men who have sex with men: from risk to prevention

We conducted a critical review of the literature on recurrent use of HIV testing in men who have sex with men (MSM). We performed a narrative review of the literature in which we analyzed the various conceptions on frequent testing over time, the implications for health programs, and the main social markers that influence the incorporation of HIV testing as routine care. Although it has existed since the 1990s, recurrent testing among MSM was frequently interpreted as increased exposure to HIV due to lack of condom use, and therefore as "unnecessary" testing. Beginning in the 2000s, periodic testing has become a programmatic recommendation and has been interpreted as a goal. Individuals' perception of their use of the test has rarely been considered in order to characterize such use as routine care. On the social and cultural level, individual aspects associated with recent or routine testing were included in contexts of favorable norms for testing and less AIDS stigma. Differences in generation, schooling, and types of affective-sexual partnerships play an important part in testing. Such differences highlight that the epidemiological category "men who have sex with men" encompasses diverse relations, identities, and practices that result in specific uses of the test as a prevention strategy. Thus, dialogue between programs, health professionals, and the persons most affected by the epidemic is crucial for building responses with real potential to confront the HIV epidemic, based on respect for human rights.

Frequency and determinants of consistent STI/HIV testing among men who have sex with men testing at STI outpatient clinics in the Netherlands: a longitudinal study

Objectives

Men who have sex with men (MSM) are at highest risk for STIs and HIV infections in the Netherlands. However, official guidelines on STI testing among MSM are lacking. They are advised to test for STIs at least every six months, but their testing behaviour is not well known. This study aimed to get insight into the proportion and determinants of consistent 6-monthly STI testing among MSM testing at STI outpatient clinics in the Netherlands.

Methods

This study included longitudinal surveillance data of STI consultations among MSM from all 26 STI outpatient clinics in the Netherlands between 1 June 2014 and 31 December 2015. Multinomial logistic regression analysis was used to identify determinants of consistent 6-monthly testing compared with single testing and inconsistent testing. Determinants of time between consultations among men with multiple consultations were analysed using a Cox Prentice-Williams-Peterson gap-time model.

Results

A total of 34 605 STI consultations of 18 634 MSM were included. 8966 (48.1%) men had more than one consultation, and 3516 (18.9%) men tested consistently 6-monthly. Indicators of high sexual risk behaviour, including having a history of STI, being HIV positive and having more than 10 sex partners, were positively associated with both being a consistent tester and returning to the STI clinic sooner. Men who were notified by a partner or who reported STI symptoms were also more likely to return to the STI clinic sooner, but were less likely to be consistent testers, identifying a group of event-driven testers.

Conclusions

The proportion of consistent 6-monthly testers among MSM visiting Dutch STI outpatient clinics was low. Testing behaviour was associated with sexual risk behaviour, but exact motives to test consistently remain unclear. Evidence-based testing guidelines are needed to achieve optimal reductions in STI transmission in the future.

Sensitivity of HIV rapid tests compared with fourth-generation enzyme immunoassays or HIV RNA tests

OBJECTIVE

Determine the sensitivity of HIV rapid tests compared with fourth-generation enzyme immunoassays (EIA) or nucleic acid amplification tests (NAAT) in clinical settings.

DESIGN

Systematic review and meta-analysis.

METHODS

Medline, PubMed, Embase, Cochrane Controlled Trials Register, Cochrane reviews and Cumulative Index to Nursing and Allied Health Literature were searched until 14 July 2015 for studies of adults comparing point-of-care HIV rapid tests to fourth-generation HIV EIA antibody/p24 antigen or HIV NAAT.

RESULTS

From 953 titles, 18 studies were included, involving 110 122 HIV rapid test results. Compared with EIA, the estimated sensitivity (random effects) of HIV rapid tests was 94.5% [95% confidence interval (CI): 87.4-97.7]. Compared with NAAT, the sensitivity of HIV rapid tests was 93.7% (95% CI: 88.7-96.5). The sensitivity of HIV rapid tests in high-income countries was 85.7% (95% CI: 81.9-88.9) and in low-income countries was 97.7% (95% CI: 95.2-98.9) compared with either EIA or NAAT (P < 0.01 for difference between settings). Proportions of antibody negative acute infections were 13.6 (95% CI: 10.1-18.0) and 4.7% (95% CI: 2.8-7.7) in studies from high-income and low-income countries, respectively (P < 0.01).

CONCLUSION

In clinical settings, HIV rapid tests were less sensitive in high-income countries compared with low-income countries, missing about one in seven infections, possibly because of the larger proportion of acute infections in targeted populations. This suggests that in high-income countries, HIV rapid tests should be used in combination with fourth-generation EIA or NAAT tests, except in special circumstances. Prospective Registration of Systematic Reviews registration number CRD42015020154.Supplementary video link: http://links.lww.com/QAD/A924.

Trends in Serosorting and the Association With HIV/STI Risk Over Time Among Men Who Have Sex With Men

BACKGROUND

Serosorting among men who have sex with men (MSM) is common, but recent data to describe trends in serosorting are limited. How serosorting affects population-level trends in HIV and other sexually transmitted infection (STI) risk is largely unknown.

METHODS

We collected data as part of routine care from MSM attending a sexually transmitted disease clinic (2002-2013) and a community-based HIV/sexually transmitted disease testing center (2004-2013) in Seattle, WA. MSM were asked about condom use with HIV-positive, HIV-negative, and unknown-status partners in the prior 12 months. We classified behaviors into 4 mutually exclusive categories: no anal intercourse (AI); consistent condom use (always used condoms for AI); serosorting [condom-less anal intercourse (CAI) only with HIV-concordant partners]; and nonconcordant CAI (CAI with HIV-discordant/unknown-status partners; NCCAI).

RESULTS

Behavioral data were complete for 49,912 clinic visits. Serosorting increased significantly among both HIV-positive and HIV-negative men over the study period. This increase in serosorting was concurrent with a decrease in NCCAI among HIV-negative MSM, but a decrease in consistent condom use among HIV-positive MSM. Adjusting for time since last negative HIV test, the risk of testing HIV positive during the study period decreased among MSM who reported NCCAI (7.1%-2.8%; P= 0.02), serosorting (2.4%-1.3%; P = 0.17), and no CAI (1.5%-0.7%; P = 0.01). Serosorting was associated with a 47% lower risk of testing HIV positive compared with NCCAI (adjusted prevalence ratio = 0.53; 95% confidence interval: 0.45 to 0.62).

CONCLUSIONS

Between 2002 and 2013, serosorting increased and NCCAI decreased among Seattle MSM. These changes paralleled a decline in HIV test positivity among MSM.

Correlates of recent HIV testing among substance-using men who have sex with men

Men who have sex with men are disproportionately impacted by HIV and substance use is a key driver of HIV risk and transmission among this population. We conducted a cross-sectional survey of 3242 HIV-negative substance-using men who have sex with men aged 18 + in the San Francisco Bay Area from March 2009 to May 2012. Demographic characteristics and sexual risk and substance use behaviors in the last six months were collected using structured telephone questionnaires. We used multivariable logistic regression to identify independent demographic and behavioral predictors of recent HIV testing. In all, 65% reported having an HIV test in the last six months. In multivariable analysis, increasing age (aOR = 0.87, 95% CI = 0.84-0.90) and drinking alcohol (<1 drink/day: 0.65, 0.46-0.92; 2-3 drinks/day: 0.64, 0.45-0.91; 4 + drinks/day: 0.52, 0.35-0.78) were negatively associated with recent HIV testing. Having two or more condomless anal intercourse partners (2.17, 1.69-2.79) was positively associated with having a recent HIV test, whereas condomless anal intercourse with serodiscordant partners was not significantly associated with testing. Older men who have sex with men and those who drink alcohol may benefit from specific targeting in efforts to expand HIV testing. Inherently riskier discordant serostatus of partners is not as significant a motivator of HIV testing as condomless anal intercourse in general.

Frequency of HIV testing among gay and bisexual men in the UK: implications for HIV prevention

Objectives

The aim of the study was to explore HIV testing frequency among UK men who have sex with men (MSM) in order to direct intervention development.

Methods

Cross‐sectional surveys were completed by 2409 MSM in Edinburgh, Glasgow and London in 2011 and a Scotland‐wide online survey was carried out in 2012/13. The frequency of HIV testing in the last 2 years was measured.

Results

Overall, 21.2% of respondents reported at least four HIV tests and 33.7% reported two or three tests in the last 2 years, so we estimate that 54.9% test annually. Men reporting at least four HIV tests were younger and less likely to be surveyed in London. They were more likely to report higher numbers of sexual and anal intercourse partners, but not “higher risk” unprotected anal intercourse (UAI) with at least two partners, casual partners and/or unknown/discordant status partners in the previous 12 months. Only 26.7% (238 of 893) of men reporting higher risk UAI reported at least four tests. Among all testers (n = 2009), 56.7% tested as part of a regular sexual health check and 35.5% tested following a risk event. Differences were observed between surveys, and those testing in response to a risk event were more likely to report higher risk UAI.

Conclusions

Guidelines recommend that all MSM test annually and those at “higher risk” test more frequently, but our findings suggest neither recommendation is being met. Additional efforts are required to increase testing frequency and harness the opportunities provided by biomedical HIV prevention. Regional, demographic and behavioural differences and variations in the risk profiles of testers suggest that it is unlikely that a “one size fits all” approach to increasing the frequency of testing will be successful.

A 'test and treat' prevention strategy in Australia requires innovative HIV testing models: a cohort study of repeat testing among 'high-risk' men who have sex with men

OBJECTIVES

HIV diagnoses among men who have sex with men (MSM) in several high-income countries, including Australia, have increased substantially over recent years. Australia, in line with global prevention strategies, has emphasised a 'test and treat' HIV prevention strategy which relies on timely detection of HIV through frequent testing by those at risk. We examined trends in repeat testing among MSM defined as 'high-risk' according to Australian testing guidelines.

METHODS

HIV test records from MSM attending high caseload clinics in Melbourne 2007-2013 and classified as high-risk were analysed. Binary outcomes of 'test within 3 months' and 'test within 6 months' were assigned to tests within individuals' panel of records. Negative binomial regressions assessed trends in overall HIV testing and returning within 3 and 6 months. Annualised proportions of return tests (2007-2012) were compared using two-sample z tests.

RESULTS

Across 18 538 tests among 7117 high-risk MSM attending primary care clinics in Melbourne (2007-2013), the number of annual HIV tests increased (p<0.01). Between 2007 and 2012 annualised proportions of tests with a subsequent test within 3 and 6 months also increased (p<0.01); however, by 2012 only 36.4% and 15.1% of tests were followed by another test inside 6 and 3 months, respectively.

CONCLUSIONS

Repeat testing among high-risk MSM in Australia remains unacceptably low, with recent modest increases in testing unlikely to deliver meaningful prevention impact. Removing known barriers to HIV testing is needed to maximise the potential benefit of test and treat-based HIV prevention.

Performance of Determine Combo and other point-of-care HIV tests among Seattle MSM

BACKGROUND AND OBJECTIVE

The rapid test study was a real-time comparison of point-of-care (POC) HIV tests to determine their abilities to detect early HIV infection.

STUDY DESIGN

Men and transgender persons reporting sex with men in the prior year were recruited at the Public Health-Seattle & King County STD Clinic, Gay City Health Project, and University of Washington Primary Infection Clinic. Study tests included the OraQuick ADVANCE Rapid HIV-1/2 Antibody Test performed on oral fluids and tests performed on fingerstick whole blood specimens including OraQuick, Uni-Gold Recombigen HIV test, Determine HIV-1/2 Ag/Ab Combo, and INSTI HIV-1 Rapid Antibody Test. Specimens from subjects with negative results were sent for EIA and nucleic acid amplification testing. McNemar's exact tests compared the numbers of HIV-infected subjects detected.

RESULTS

Between February 2010 and August 2014, there were 3438 study visits. Twenty-four subjects had discordant POC results with at least one reactive and one non-reactive test, including one subject with a reactive Determine p24 antigen. OraQuick performed on oral fluids identified fewer persons compared to all fingerstick tests. OraQuick performed on fingerstick whole blood detected fewer persons compared to the Determine Combo antibody component (p=.008) and Combo overall (p=.004), and there was a trend when compared to INSTI (p=.06). The Determine Combo specificity was 98.99%.

CONCLUSIONS

As reported by others, Determine Combo underperforms compared to laboratory-based testing, but it did detect one acute infection. If these results are validated, the specificity of Determine Combo may limit its usefulness in populations with lower HIV incidence.

"Seek, Test, Treat" Lessons From Australia: A Study of HIV Testing Patterns From a Cohort of Men Who Have Sex With Men

OBJECTIVE

HIV diagnoses are increasing in Australia, mostly among men who have sex with men (MSM). Similar to many countries, Australia's HIV prevention strategies emphasize a "seek, test, treat" approach including enhancing HIV testing frequency. We describe HIV testing among MSM and correlates of returning for testing within 12 months in the context of new HIV prevention paradigms.

METHODS

Testing and behavioral data (2007-2013) contributed by MSM aged ≥ 16 years were included. Total HIV tests by calendar year and repeat tests within 12 months were described, alongside negative binomial regression for trend. A 2-level mixed-effects logistic regression model examined correlates of testing within 12 months. Median (days) between HIV tests was compared between MSM diagnosed with HIV and persistently HIV-negative MSM.

RESULTS

The study included 46,060 tests from 17,904 MSM. There was an increase in annual tests (P < 0.01), repeat tests within 12 months (P < 0.01), and the proportion of tests within 12 months of an index test (P < 0.01), although only to 53.3% in 2013. Return rates were higher in MSM aged 16-29 years (adjusted odds ratio 1.30, 95% confidence interval: 1.1 to 1.5) and those reporting higher numbers of partners (adjusted odds ratio 3.5, 95% confidence interval: 3.0 to 4.0). Median time between tests among MSM diagnosed with HIV (233 days) was greater than for HIV-negative MSM (189 days) (P = 0.03).

CONCLUSIONS

Although testing has increased, testing frequency among many MSM remains suboptimal. To optimize "seek, test, treat"-based HIV prevention strategies, new approaches to increase testing uptake and early HIV detection among MSM are needed.

Evaluating interventions to promote routine preventive screenings: a comparison of analytical outcomes

BACKGROUND

Often in public health, we are interested in promoting routine preventive screenings (e.g., blood glucose monitoring, hypertension screening, or mammography). Evaluating novel interventions to encourage frequent screenings using randomized controlled trials can help inform evidence-based health promotion programs. When the desired behavior change is a recurrent event, specifying the most meaningful study outcomes may prove challenging.

METHODS

To understand the efficiency of multiple approaches for evaluating an intervention seeking to increase regular health screenings we (a) simulated several replications of a trial with a positive intervention effect under various censoring scenarios, (b) formulated three different analytical outcome definitions (screening a certain number of times during the entire study period versus not, screening at least once within a clinically meaningful time period versus not, "hazard" or instantaneous rate of screening), and (c) compared them with regard to interpreting results and estimating power at different sample sizes.

RESULTS

Approaches which better utilize detailed prospective data, while also accounting for within-participant correlations, are less likely to miss the actual underlying benefits conferred by a new prevention strategy compared to relying on a dichotomous measure derived from aggregating events over the study duration. Such approaches are also more powerful in realistic scenarios wherein some participants are lost to follow-up over time.

CONCLUSIONS

Researchers should carefully consider the choice of analytical outcomes and strive to employ more efficient approaches that model comprehensive event-specific information, rather than summarizing repeated measures into less-informative dichotomous responses, while designing and conducting trials with recurrent preventive screenings.

Repeated STI and HIV testing among HIV-negative men who have sex with men attending a large STI clinic in Amsterdam: a longitudinal study

OBJECTIVE

In the Netherlands, men who have sex with men (MSM) are advised via informal guidelines to test for STI at least annually. We estimated the proportion of HIV-negative MSM testing repeatedly at 12-month or smaller intervals at a large STI clinic in the Netherlands. In addition, we explored whether repeated testing is related to risk behaviour.

DESIGN AND METHODS

Longitudinal data of HIV-negative MSM visiting the Amsterdam STI clinic between 2009 and 2012 were analysed. To estimate the timing of repeated testing, Kaplan-Meier methods were used. Determinants for repeated testing (distinguishing testing at 12-month or smaller intervals and less than 12-monthly testing, with single testers as reference group) were identified using multivariate multinomial logistic regression analyses.

RESULTS

In total, 19,479 consultations of 9174 HIV-negative MSM were identified. Of these MSM, 35% (95% CI 33% to 36%) were estimated to return to the STI clinic within 1 year following baseline consultation. Among 1767 men with at least two consultations and at least 2 years between baseline and last consultation, 43% tested repeatedly at 12-month or smaller intervals in those first 2 years. Repeated testers reported higher sexual risk behaviour (ie, only casual or both casual and steady sex partners, higher numbers of sex partners) at baseline compared with single testers. This effect tended to be slightly stronger for men testing repeatedly at 12-month or smaller intervals.

CONCLUSIONS

The proportion of MSM testing for STI annually is low. MSM testing repeatedly had higher baseline levels of risk behaviour. Strategies to motivate MSM to test annually should be explored.

Evaluating New Definitions of Acute and Early HIV Infection from HIV Surveillance Data

BACKGROUND

The U.S. HIV staging system is being revised to more comprehensively track early and acute HIV infection (AHI). We evaluated our ability to identify known cases of AHI using King County (KC) HIV surveillance data.

METHODOLOGY

AHI cases were men who have sex with men (MSM) with negative antibody and positive pooled nucleic acid amplification (NAAT) tests identified through KC testing sites. We used KC surveillance data to calculate inter-test intervals (ITI, time from last negative to first positive test) and the serologic algorithm for recent HIV seroconversion (STARHS). For surveillance data, AHI was defined as an ITI of ≤ 30 days and early infection as an ITI ≤ 180 days or STARHS recent result. Dates of last negative HIV tests were obtained from lab reports in the HIV surveillance system or data collected for HIV Incidence Surveillance.

RESULTS

Between 2005 and 2011, 47 MSM with AHI were identified by pooled NAAT. Of the 47 cases, 36% had ITI < 1 day, 60% had an ITI < 30 days, and 70% (95% CI=55-82%) had an ITI ≤ 6 months and would have been identified as early HIV infection. Of the 47, 38% had STARHS testing and 94% were STARHS recent.

CONCLUSION

MSM with known AHI were not identified by proposed definitions of AHI and early infection. These known AHI cases were frequently missed by HIV surveillance because concurrent negative antibody tests were not reported. Successful implementation of the revisions to the HIV staging system will require more comprehensive reporting.

Why do men who have sex with men test for HIV infection? Results from a community-based testing program in Seattle

BACKGROUND

The Centers for Disease Control and Prevention recommends at least annual HIV testing for men who have sex with men (MSM), but motivations for testing are not well understood.

METHODS

We evaluated data from MSM testing for HIV at a community-based program in King County, Washington. Correlates of regular testing were examined using generalized estimating equation regression models.

RESULTS

Between February 2004 and June 2011, 7176 MSM attended 12,109 HIV testing visits. When asked reasons for testing, 49% reported that it was time for their regular test, 27% reported unprotected sex, 24% were starting relationships, 21% reported sex with someone new, 21% sought sexually transmitted infection/hepatitis screening, 12% reported sex with an HIV-infected partner, 2% suspected primary HIV infection, and 16% reported other reasons. In multivariable analysis, factors associated with regular testing included having a regular health care provider and the following in the previous year: having only male partners, having 10 or more male partners, inhaled nitrite use, not injecting drugs, and not having unprotected anal intercourse with a partner of unknown/discordant status (P ≤ 0.001 for all). Men reporting regular testing reported shorter intertest intervals than men who did not (median of 233 vs. 322 days, respectively; P < 0.001).

CONCLUSIONS

Regular testing, sexual risk, and new partnerships were important drivers of HIV testing among MSM, and regular testing was associated with increased testing frequency. Promoting regular testing may reduce the time that HIV-infected MSM are unaware of their status, particularly among those who have sex with men and women or inject drugs.

Replacing clinic-based tests with home-use tests may increase HIV prevalence among Seattle men who have sex with men: evidence from a mathematical model

BACKGROUND

Home-use tests have potential to increase HIV testing but may increase the rate of false-negative tests and decrease linkage to HIV care. We sought to estimate the impact of replacing clinic-based testing with home-use tests on HIV prevalence among men who have sex with men (MSM) in Seattle, Washington.

METHODS

We adapted a deterministic, continuous-time model of HIV transmission dynamics parameterized using a 2003 random digit dial study of Seattle MSM. Test performance was based on the OraQuick In-Home HIV Test (OraSure Technologies, Inc, Bethlehem, PA) for home-use tests and, on an average, of antigen-antibody combination assays and nucleic acid amplification tests for clinic-based testing.

RESULTS

Based on observed levels of clinic-based testing, our baseline model predicted an equilibrium HIV prevalence of 18.6%. If all men replaced clinic-based testing with home-use tests, prevalence increased to 27.5% if home-use testing did not impact testing frequency and to 22.4% if home-use testing increased testing frequency 3-fold. Regardless of how much home-use testing increased testing frequency, any replacement of clinic-based testing with home-use testing increased prevalence. These increases in HIV prevalence were mostly caused by the relatively long window period of the currently approved test. If the window period of a home-use test were 2 months instead of 3 months, prevalence would decrease if all MSM replaced clinic-based testing with home-use tests and tested more than 2.6 times more frequently.

CONCLUSIONS

Our model suggests that if home-use HIV tests replace supplement clinic-based testing, HIV prevalence may increase among Seattle MSM, even if home-use tests result in increased testing.

Relative accuracy of serum, whole blood, and oral fluid HIV tests among Seattle men who have sex with men

BACKGROUND

Point-of-care (POC) rapid HIV tests have sensitivity during the "window period" comparable only to earliest generation EIAs. To date, it is unclear whether any POC test performs significantly better than others.

OBJECTIVE

Compare abilities of POC tests to detect early infection in real time.

STUDY DESIGN

Men who have sex with men (MSM) were recruited into a prospective, cross-sectional study at two HIV testing sites and a research clinic. Procedures compared four POC tests: one performed on oral fluids and three on fingerstick whole blood specimens. Specimens from participants with negative POC results were tested by EIA and pooled nucleic acid amplification testing (NAAT). McNemar's exact tests compared numbers of HIV-infected participants detected.

RESULTS

Between February 2010 and May 2013, 104 men tested HIV-positive during 2479 visits. Eighty-two participants had concordant reactive POC results, 3 participants had concordant non-reactive POC tests but reactive EIAs, and 8 participants had acute infection. Of 12 participants with discordant POC results, OraQuick ADVANCE Rapid HIV-1/2 Antibody Test performed on oral fluids identified fewer infections than OraQuick performed on fingerstick (p = .005), Uni-Gold Recombigen HIV test (p = .01), and determine HIV-1/2 Ag/Ab combo (p = .005).

CONCLUSIONS

These data confirm that oral fluid POC testing detects fewer infections than other methods and is best reserved for circumstances precluding fingerstick or venipuncture. Regardless of specimen type, POC tests failed to identify many HIV-infected MSM in Seattle. In populations with high HIV incidence, the currently approved POC antibody tests are inadequate unless supplemented with p24 antigen tests or NAAT.

Time since last negative HIV test among men who have sex with men and people who use injection drugs in British Columbia, 2006-2011

OBJECTIVES

Canadian surveys of men who have sex with men (MSM) and people using injection drugs (IDU) demonstrate that most have tested for HIV at least once, but that half or fewer have done so in the previous year. To better inform targeted HIV testing guidelines for these populations, we derived estimates of inter-test interval (ITI) for persons newly diagnosed with HIV in British Columbia (BC) between 2006 and 2011, and assessed variables associated with longer ITI among MSM and IDU.

METHODS

Provincial HIV case report and testing data were linked by deterministic and probabilistic matching (based on unique personal health number, name, and date of birth). ITI was defined as time from last recorded negative to first positive HIV result; those with ITI ≤30 days were excluded.

RESULTS

Of 2,004 eligible individuals, 1,116 (55.7%) had a recorded negative HIV test result in the previous ten years. Overall median ITI was 20 months with a skewed distribution (inter-quartile range 8-46); median ITI was 15 months for MSM and 21 months for IDU with 41.2% and 33.1% testing in the past year, respectively. Longer ITI was associated with older age for both groups, and among MSM with residence outside Vancouver and not known to have an HIV-positive partner.

CONCLUSIONS

These findings highlight potential missed opportunities for earlier detection of HIV and prevention of secondary transmission among newly diagnosed MSM and IDU, and provide evidence to inform recommendations for HIV test frequency and testing strategies for these populations in BC.

Factors associated with regular HIV testing among a sample of US MSM with HIV-negative main partners

: HIV transmission is common within men who have sex with men (MSM) couples; despite recommendations that MSM who engage in risky sexual behaviors get tested biannually/annually, little is known about the testing patterns of MSM while in a current primary relationship. This study compared demographic and relationship characteristics of groups of MSM with different testing patterns while in their primary relationships and assessed which factors were associated with regular or irregular testing. Two hundred seventy-five HIV-negative male couples/550 MSM were recruited online to complete a survey in 2011. Since the start of their relationship, 21% of MSM tested for HIV every 3, 4, or 6 months; 29% tested once a year; 30% tested only when they felt at risk for HIV; and 20% never tested for HIV. Bivariate analyses indicated that men who had never been tested while in their relationship were younger, less educated, had greater trust in their partner, and were less likely to be in a couple that had 1 or both men having had sex with someone else. In the multivariate analyses, testing at regular intervals was associated with higher education, having a sexual agreement, being in a couple that had 1 or both men having had sex with someone else, and having lower faith in trust toward the main partner. Findings suggest that many MSM's testing behaviors while in their primary relationship do not align with their risk profile. Trust seems to be a barrier to regular HIV testing, which may be addressed by encouraging MSM to negotiate clear sexual agreements with their primary partner.