scholarly journals Association between rectal gonorrhoea and HIV incidence in men who have sex with men: a meta-analysis

2021 ◽  
pp. sextrans-2021-055254
Author(s):  
Deborah Donnell ◽  
Kidist Zewdie ◽  
Natasha Ratna ◽  
Veronica Miller ◽  
John Michael Saunders ◽  
...  
Keyword(s):  
Meta Analysis ◽  
Population Level ◽  
Incidence Rates ◽  
Hiv Incidence ◽  
Art Initiation ◽  
Persons Living With Hiv ◽  
Hiv Exposure ◽  
Sex With Men ◽  
Sexual Health Clinics ◽  
Hiv Negative

BackgroundIncidence of rectal gonorrhoea (GC) has been hypothesised as a correlate of HIV exposure in prevention trials of men who have sex with men (MSM). High rectal GC incidence in MSM trials of new biomedical prevention drugs may provide supportive evidence for ongoing HIV risk. Empirical evidence of correlation between rectal GC and HIV incidence is needed to assess whether high rectal GC rates reliably correlate with high risk of HIV.MethodsRectal GC and HIV are routinely tested in sexual health clinics (SHCs) throughout England. Through routine surveillance data collected at visits to SHCs, we assessed HIV incidence and new rectal GC diagnoses in repeat visits by HIV-negative MSM between 2011 and 2018, predating widespread roll-out of pre-exposure prophylaxis. Meta-analysis regression assessed population-level association between HIV and rectal GC incidence over time.FindingsBetween 2011 and 2018, HIV and rectal GC incidence was assessed in 541 056 HIV-negative MSM attending SHCs in England. HIV incidence among MSM attending SHCs fell from 1.26/100 person-years (PYs) in 2011 to 0.28/100 PYs in 2018. Rectal GC rates increased from 3.5/100 PYs to 11.1/100 PYs over the same period. The rate of HIV incidence decreased by 22.3% for each percent increase in rectal GC (95% CI –30.8 to –14.7, p<0.001).InterpretationAmong the population of MSM attending SHCs in England, rectal GC rates increased substantially while HIV incidence rates decreased between 2011 and 2018. HIV incidence likely decreased through expanded HIV testing, prompt antiretroviral treatment (ART) initiation and increased viral suppression in persons living with HIV, interventions that did not decrease rectal GC. Rectal GC may not be an ideal proxy for HIV incidence in trials, as HIV exposure risk is complex and context dependent, given effective HIV prevention interventions in MSM.Introduction

scholarly journals Implementation of a Rapid Entry Program Decreases Time to Viral Suppression Among Vulnerable Persons Living With HIV in the Southern United States

2018 ◽  
Vol 5 (6) ◽  
Author(s):  
Jonathan Colasanti ◽  
Jeri Sumitani ◽  
C Christina Mehta ◽  
Yiran Zhang ◽  
Minh Ly Nguyen ◽  
...  
Keyword(s):  
United States ◽  
Viral Suppression ◽  
Hiv Transmission ◽  
Positive Impact ◽  
Population Level ◽  
The United States ◽  
Clinic Visit ◽  
Art Initiation ◽  
Persons Living With Hiv ◽  
Sex With Men

Abstract Background Rapid entry programs (REPs) improve time to antiretroviral therapy (ART) initiation (TAI) and time to viral suppression (TVS). We assessed the feasibility and effectiveness of a REP in a large HIV clinic in Atlanta, Georgia, serving a predominately un- or underinsured population. Methods The Rapid Entry and ART in Clinic for HIV (REACH) program was implemented on May 16, 2016. We performed a retrospective cohort study with the main independent variable being period of enrollment: January 1, 2016, through May 15, 2016 (pre-REACH); May 16, 2016, through July 31, 2016 (post-REACH). Included individuals were HIV-infected and new to the clinic with detectable HIV-1 RNA. Six-month follow-up data were collected for each participant. Survival analyses were conducted for TVS. Logistic and linear regression analyses were used to evaluate secondary outcomes: attendance at first clinic visit, viral suppression, TAI, and time to first attended provider visit. Results There were 117 pre-REACH and 90 post-REACH individuals. Median age (interquartile range [IQR]) was 35 (25–45) years, 80% were male, 91% black, 60% men who have sex with men, 57% uninsured, and 44% active substance users. TVS decreased from 77 (62–96) to 57 (41–70) days (P &lt; .0022). Time to first attended provider visit decreased from 17 to 5 days, and TAI from 21 to 7 days (P &lt; .0001), each remaining significant in adjusted models. Conclusions This is the largest rapid entry cohort described in the United States and suggests that rapid entry is feasible and could have a positive impact on HIV transmission at the population level.

scholarly journals Preparing for PrEP: estimating the size of the population eligible for HIV pre-exposure prophylaxis among men who have sex with men in England

2019 ◽  
Vol 95 (7) ◽  
pp. 484-487 ◽  
Author(s):  
Holly D Mitchell ◽  
Sarika Desai ◽  
Hamish Mohammed ◽  
Koh Jun Ong ◽  
Martina Furegato ◽  
...  
Keyword(s):  
Population Level ◽  
Annual Number ◽  
Hiv Incidence ◽  
Eligibility Criteria ◽  
Transmitted Infection ◽  
Negative Test ◽  
The Past ◽  
Sex With Men ◽  
Exposure Prophylaxis ◽  
Hiv Negative

ObjectivesThe size of the population of men who have sex with men (MSM) who may be eligible for HIV pre-exposure prophylaxis (HIV-PrEP) in England remains unknown. To plan for a national PrEP implementation trial, we estimated the number of MSM attending sexual health clinics (SHCs) that may be eligible for HIV-PrEP in England.MethodsSexually transmitted infection (STI) surveillance data from 2010 to 2015 from the GUMCAD surveillance system were used to estimate the annual number of HIV-negative MSM who may be eligible for HIV-PrEP in England. Based on national eligibility criteria, we identified HIV-negative MSM attending SHCs with a HIV-negative test in the past year and used diagnosed bacterial STI (past year) in this group as a proxy for condomless sex and eligibility for HIV-PrEP. We estimated HIV incidence per 100 person-years (py) in these groups in 2014.ResultsDuring 2010–2015, the number of HIV-negative MSM attending SHCs with a HIV-negative test in the past year doubled from 14 643 to 29 023, and HIV incidence in this group was 1.9 (95% CI 1.6 to 2.2) per 100 py in 2014. In the same period, the subgroup with a bacterial STI diagnosis (past year), and therefore considered potentially eligible for HIV-PrEP in this analysis, increased from 4365 (30%) to 10 276 (35%). HIV incidence in this subgroup was 3.3 (95% CI 2.7 to 4.0) per 100 py in 2014.ConclusionsIn 2015, approximately 10 000 HIV-negative MSM were considered potentially eligible for HIV-PrEP based on clinic history in GUMCAD. These data were used to inform the initial recruitment target for the PrEP Impact Trial and will inform future evaluations at a population level.

scholarly journals Estimation of HIV incidence in two Brazilian municipalities, 2013

2016 ◽  
Vol 50 (0) ◽  
Author(s):  
Célia Landmann Szwarcwald ◽  
Orlando da Costa Ferreira Júnior ◽  
Ana Maria de Brito ◽  
Karin Regina Luhm ◽  
Clea Elisa Lopes Ribeiro ◽  
...  
Keyword(s):  
Total Population ◽  
Hiv Infections ◽  
Incidence Rates ◽  
Hiv Incidence ◽  
Female Ratio ◽  
Exposure Category ◽  
Two Cities ◽  
Population Subgroup ◽  
Sex With Men ◽  
Male To Female

ABSTRACT OBJECTIVE To estimate HIV incidence in two Brazilian municipalities, Recife and Curitiba, in the year of 2013. METHODS The method for estimating incidence was based on primary information, resulting from the Lag-Avidity laboratory test for detection of recent HIV infections, applied in a sample of the cases diagnosed in the two cities in 2013. For the estimation of the HIV incidence for the total population of the cities, the recent infections detected in the research were annualized and weighted by the inverse of the probability of HIV testing in 2013 among the infected and not diagnosed cases. After estimating HIV incidence for the total population, the incidence rates were estimated by sex, age group, and exposure category. RESULTS In Recife, 902 individuals aged 13 years and older were diagnosed with HIV infection. From these, 528 were included in the study, and the estimated proportion of recent infections was 13.1%. In Curitiba, 1,013 people aged 13 years and older were diagnosed, 497 participated in the study, and the proportion of recent infections was 10.5%. In Recife, the estimated incidence rate was 53.1/100,000 inhabitants of 13 years and older, while in Curitiba, it was 41.1/100,000, with male-to-female ratio of 3.5 and 2.4, respectively. We observed high rates of HIV incidence among men who have sex with men, of 1.47% in Recife and 0.92% in Curitiba. CONCLUSIONS The results obtained in the two cities showed that the group of men who have sex with men are disproportionately subject to a greater risk of new infections, and indicate that strategies to control the spread of the epidemic in this population subgroup are essential and urgent.

scholarly journals Chemsex and the city: sexualised substance use in gay bisexual and other men who have sex with men attending sexual health clinics

2016 ◽  
Vol 28 (4) ◽  
pp. 362-366 ◽  
Author(s):  
A Hegazi ◽  
MJ Lee ◽  
W Whittaker ◽  
S Green ◽  
R Simms ◽  
...  
Keyword(s):  
Substance Use ◽  
Hepatitis C ◽  
Drug Use ◽  
Sexual Health ◽  
Clinical Pathways ◽  
Post Exposure Prophylaxis ◽  
Hiv Incidence ◽  
Health Clinics ◽  
Sex With Men ◽  
Sexual Health Clinics

The objective of this study was to analyse associations between sexualised substance use (chemsex), STI diagnoses and sexual behaviour among gay bisexual and other men who have sex with men accessing sexual health clinics to better inform clinical pathways. A retrospective case notes review was undertaken following the introduction of more detailed and holistic profomas for all gay bisexual and other men who have sex with men attending two London sexual health clinics between 1 June 2014 and 31 January 2015. Chemsex status was documented for 655/818. Overall, 30% disclosed recreational drug use of whom 113 (57%) disclosed chemsex and 27 (13.5%) injecting drugs. HIV-positive gay bisexual and other men who have sex with men were more likely to disclose chemsex (AOR 6.68; 95% CI 3.91–11.42; p < 0.001). Those disclosing chemsex had a higher incidence of acute bacterial STIs (AOR 2.83 CI 1.79–4.47; p < 0.001), rectal STIs (AOR 3.10 CI 1.81–5.32; p < 0.001) or hepatitis C (AOR 15.41 CI 1.50–158.17; p = 0.021). HIV incidence in the study period was 1.8% (chemsex) vs. 0.9% (no chemsex) (p = 0.61). Chemsex was associated with having more sexual partners, transactional sex, group sex, fisting, sharing sex toys, injecting drug use, higher alcohol consumption and the use of ‘bareback’ sexual networking applications (p < 0.004). Chemsex participants were also more likely to have accessed post-exposure prophylaxis for HIV in the study period and report sex with a discordant HIV or hepatitis C-infected partner (p < 0.001). Chemsex disclosure is associated with higher risk-taking behaviours, acute bacterial STIs, rectal STIs and hepatitis C incidence. HIV incidence was higher but not significantly so in the study period. Chemsex disclosure in sexual health clinics should prompt an opportunity for prevention, health promotion and wellbeing interventions.

“Proud I Am Negative”

2017 ◽  
Vol 21 (2) ◽  
pp. 276-290 ◽  
Author(s):  
Jagadisa-devasri Dacus ◽  
Dexter R. Voisin ◽  
Judith Barker
Keyword(s):  
New York ◽  
New York City ◽  
Social Supports ◽  
Hiv Infections ◽  
Hiv Stigma ◽  
Hiv Incidence ◽  
Personal Agency ◽  
Safe Spaces ◽  
Sex With Men ◽  
Hiv Negative

HIV incidence among black men who have sex with men (BMSM) is at epidemic proportions. However, the vast majority of studies have focused on risk factors related to HIV infections with a dearth of research on resiliency and how BMSM maintain seronegativity. Using three focus groups ( N = 29) comprised of BMSM in New York City, this study explored psychosocial factors and practices related to maintaining seronegativity. Major themes included having spirituality and/or religious beliefs, access to social supports that held positive expectations, and having personal agency by engaging in seroadaptive harm reduction practices. Overall, findings highlight the importance of addressing HIV stigma, supporting the need for BMSM to be validated, and creating safe spaces that allow them to discuss the challenges related to remaining HIV-negative.

HIV incidence and associated risk factors in men who have sex with men in Mainland China: an updated systematic review and meta-analysis

Sexual Health ◽  
2016 ◽  
Vol 13 (4) ◽  
pp. 373 ◽  
Author(s):  
Wei Zhang ◽  
Jun-Jie Xu ◽  
Huachun Zou ◽  
Jing Zhang ◽  
Ning Wang ◽  
...  
Keyword(s):  
Meta Analysis ◽  
College Education ◽  
Junior College ◽  
People Living With Hiv ◽  
Hiv Incidence ◽  
Syphilis Infection ◽  
Hiv Intervention ◽  
Hiv Prevention Strategies ◽  
Hiv Seroconversion ◽  
Sex With Men

Background: The national annually reported proportion of men who have sex with men (MSM) among people living with HIV (PLWH) is growing in China. To better inform the public health sector how to improve HIV prevention strategies, it is necessary to understand the current level of HIV incidence and its correlates. Methods: Google Scholar, PubMed, Web of Science and three major Chinese electronic publication databases (http://qikan.cqvip.com/, http://g.wanfangdata.com.cn/, http://www.cnki.net/, respectively) were searched for studies reporting HIV incidence. Comprehensive Meta-Analysis (CMA) 2.0 statistical software (Biostat, Inc. Englewood, NJ, USA) was used to calculate the pooled HIV incidence and perform subgroup-analysis to find correlates for HIV seroconversion in Chinese MSM. Random effects modelling was then conducted. Results: Twenty-five eligible studies were included in this meta-analysis. The calculated pooled HIV incidence was 5.61/100 person years (PY), with an increasing trend over time (3.24/100PY, 5.29/100PY, 5.50/100PY in 2005–2008, 2009–2011, 2012–2014 respectively, χ2 test for trend P = 0.04). Subgroup analyses indicated that age <25 years (rate ratio (RR) = 1.85), junior college education and below (RR = 1.87), having ≥ 2 male sexual partners in past 6 months (RR = 2.50), baseline syphilis infection (RR = 2.99), homosexual orientation (RR = 1.91), preferred bottom/versatile roles in anal sexual intercourse (RR = 2.33), and having unprotected anal intercourse in the past 6 months (RR = 2.16) significantly increased the risk for HIV seroconversion (each P < 0.05). Uncircumcised MSM had a marginal statistically significant higher HIV incidence (RR = 3.35, P = 0.051). Conclusion: HIV incidence is still alarmingly high among Chinese MSM. Stronger HIV intervention strategies should be implemented, in particular targeting young, less educated and syphilis-infected MSM.

scholarly journals Influence of serosorting and intervention-mediated changes in serosorting on the population-level HIV transmission impact of pre-exposure prophylaxis among men who have sex with men: a mathematical modelling study

2020 ◽  
Author(s):  
Linwei Wang ◽  
Nasheed Moqueet ◽  
Anna Simkin ◽  
Jesse Knight ◽  
Huiting Ma ◽  
...  
Keyword(s):  
Condom Use ◽  
Hiv Transmission ◽  
Population Level ◽  
Poor Adherence ◽  
Hiv Incidence ◽  
Individual Level ◽  
Prep Implementation ◽  
Mixing Patterns ◽  
Sex With Men ◽  
Exposure Prophylaxis

ABSTRACTBackgroundHIV pre-exposure prophylaxis (PrEP) may change serosorting patterns. We examined the influence of serosorting on the population-level HIV transmission impact of PrEP, and how impact could change if PrEP users stopped serosorting.MethodsWe developed a compartmental HIV transmission model parameterized with bio-behavioural and HIV surveillance data among men who have sex with men in Canada. We separately fit the model with serosorting and without serosorting (random partner-selection proportional to availability by HIV-status (sero-proportionate)), and reproduced stable HIV epidemics (2013-2018) with HIV-prevalence 10.3%-24.8%, undiagnosed fraction 4.9%-15.8%, and treatment coverage 82.5%-88.4%. We simulated PrEP-intervention reaching stable coverage by year-1 and compared absolute difference in relative HIV-incidence reduction 10-year post-intervention (PrEP-impact) between: models with serosorting vs. sero-proportionate mixing; and scenarios in which PrEP users stopped vs. continued serosorting. We examined sensitivity of results to PrEP-effectiveness (44%-99%) and coverage (10%-50%).FindingsModels with serosorting predicted a larger PrEP-impact compared with models with sero-proportionate mixing under all PrEP-effectiveness and coverage assumptions (median (inter-quartile-range): 8.1%(5.5%-11.6%)). PrEP users” stopping serosorting reduced PrEP-impact compared with when PrEP users continued serosorting: reductions in PrEP-impact were minimal (2.1%(1.4%-3.4%)) under high PrEP-effectiveness (86%-99%); however, could be considerable (10.9%(8.2%-14.1%)) under low PrEP effectiveness (44%) and high coverage (30%-50%).InterpretationModels assuming sero-proportionate mixing may underestimate population-level HIV-incidence reductions due to PrEP. PrEP-mediated changes in serosorting could lead to programmatically-important reductions in PrEP-impact under low PrEP-effectiveness (e.g. poor adherence/retention). Our findings suggest the need to monitor sexual mixing patterns to inform PrEP implementation and evaluation.FundingCanadian Institutes of Health ResearchRESEARCH IN CONTEXTEvidence before this studyWe searched PubMed for full-text journal articles published between Jan 1, 2010, and Dec 31, 2017, using the MeSH terms “pre-exposure prophylaxis (PrEP)” and “homosexuality, male” and using key words (“pre-exposure prophylaxis” or “preexposure prophylaxis” or “PrEP”) and (“men who have sex with men” or “MSM”) in titles and abstracts. Search results (520 records) were reviewed to identify publications which examined the population-level HIV transmission impact or population-level cost-effectiveness of PrEP in high-income settings. We identified a total of 18 modelling studies of PrEP impact among men who have sex with men (MSM) and four studies were based on the same model with minor variations (thus only the most recent one was included). Among the 15 unique models of PrEP impact, three included serosorting. A total of nine models have assessed the individual-level behaviour change among those on PrEP and its influence on the transmission impact of PrEP. Specifically, the models examined increases in number of partners and reductions in condom use. Most models predicted that realistic increases in partner number or decreases in condom use would not fully offset, but could weaken, PrEP”s impact on reducing HIV transmission. We did not identify any study that examined the influence of serosorting patterns on the estimated transmission impact of PrEP at the population-level, or what could happen to HIV incidence if the use of PrEP changes serosorting patterns.Added value of this studyWe used a mathematical model of HIV transmission to estimate the influence of serosorting and PrEP-mediated changes in serosorting on the transmission impact of PrEP at the population-level among MSM. We found the impact of PrEP was higher under epidemics with serosorting, compared with comparable epidemics simulated assuming sero-proportionate mixing. Under epidemics with serosorting, when PrEP users stopped serosorting (while other men continue to serosort among themselves) we found a reduced PrEP impact compared with scenarios when PrEP users continued to serosort. The magnitude of reduction in PrEP impact was minimal if PrEP-effectiveness was high; however, could be programmatically-meaningful in the context of low PrEP-effectiveness (e.g., poor adherence or retention) and high PrEP coverage. To our knowledge, our study is the first to directly examine the influence of serosorting and PrEP-mediated changes in serosorting on the transmission impact of PrEP and its underlying mechanism.Implications of all the available evidenceOur findings suggest that models which do not consider baseline patterns of serosorting among MSM could potentially underestimate PrEP impact. In addition to monitoring individual-level behavioural change such as condom use, our findings highlight the need to monitor population-level sexual mixing patterns and their changes over time among MSM in the design and evaluation of PrEP implementation.

scholarly journals Antiretroviral therapy for prevention of HIV transmission: implications for Europe

2013 ◽  
Vol 18 (48) ◽  
Author(s):  
V Cambiano ◽  
J O’Connor ◽  
A N Phillips ◽  
A Rodger ◽  
R Lodwick ◽  
...  
Keyword(s):  
Antiretroviral Therapy ◽  
People Who Inject Drugs ◽  
Hiv Transmission ◽  
Controlled Trial ◽  
Population Level ◽  
Hiv Infections ◽  
Cd4 Count ◽  
Art Initiation ◽  
Sex With Men ◽  
Randomised Controlled

The aim of this review is to summarise the evidence on the population-level effect of antiretroviral therapy (ART) in preventing HIV infections, and to discuss potential implications in the European context of recommending starting ART when the CD4 count is above 350 cells/mm3. The ability of ART to reduce the risk of HIV transmission has been reported in observational studies and in a randomised controlled trial (HPTN 052), in which ART initiation reduced HIV transmission by 96% within serodiscordant couples. As yet, there is no direct evidence for such an effect among men having sex with men or people who inject drugs. HPTN 052 led international organisations to develop recommendations with a higher CD4 threshold for ART initiation. However, there remains a lack of strong evidence of clinical benefit for HIV-positive individuals starting ART with CD4 count above 350 cells/mm3. The main goal of ART provision should be to increase ART coverage for all those in need, based on the current guidelines, and the offer of ART to those who wish to reduce infectivity; increased HIV testing is therefore a key requirement. Other proven prevention means such as condom use and harm reduction for people who inject drugs remain critical.

Anal cancers attributed to human papillomavirus are more common in areas in Victoria, Australia, with higher HIV notifications

Sexual Health ◽  
2013 ◽  
Vol 10 (3) ◽  
pp. 220
Author(s):  
Lenka A. Vodstrcil ◽  
Jane Hocking ◽  
Tim R. H. Read ◽  
Andrew E. Grulich ◽  
Christopher K. Fairley
Keyword(s):  
Colon Cancer ◽  
Anal Cancer ◽  
Brain Cancer ◽  
Incidence Rate Ratio ◽  
Population Level ◽  
Incidence Rates ◽  
Notification Rate ◽  
Anal Squamous Cell Carcinoma ◽  
Male Age ◽  
Sex With Men

Background Anal cancer is more common in men who have sex with men with HIV. We aimed to determine if there was an association between anal squamous cell carcinoma (SCC) and HIV notifications in men in Victoria, Australia, at a population level. Methods: We calculated the male age-standardised incidence rates for anal SCC, brain cancer and colon cancer for each local government area (LGA) in Victoria from 1982 to 31 December 2010 using the Victorian Cancer Registry. Male HIV rates in each LGA were calculated using the Victorian HIV Registry. Results: There were 288 men diagnosed with anal SCC, 8793 with brain cancer and 23 938 with colon cancer in 57 LGAs. There were 3163 men notified with HIV during the same period in the same LGAs (range: 4–435 per LGA). There was a significant positive correlation (r = 0.45, P < 0.001, r2 = 0.20) between the age-standardised rate of anal SCC and the rate of HIV notifications in men in each LGA but no correlation between the male age-standardised rate of colon (Pearson’s r = –0.11, P = 0.40) or brain (r = –0.05, P = 0.71) cancers, and the rate of HIV. The rate of anal cancer was ~50% higher in LGAs with the highest HIV notification rate (incidence rate ratio = 1.47; 95% confidence interval: 1.10–1.97). Conclusions: At a population level, about one in five cases (r2 = 0.20) of anal SCCs in men are explained by the rate of HIV notifications in that LGA.

scholarly journals Population-Level Sexual Mixing According to HIV Status and Preexposure Prophylaxis Use Among Men Who Have Sex With Men in Montreal, Canada: Implications for HIV Prevention

2019 ◽  
Vol 189 (1) ◽  
pp. 44-54 ◽  
Author(s):  
Linwei Wang ◽  
Nasheed Moqueet ◽  
Gilles Lambert ◽  
Daniel Grace ◽  
Ricky Rodrigues ◽  
...  
Keyword(s):  
Population Level ◽  
Hiv Positive ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Preexposure Prophylaxis ◽  
Immunodeficiency Virus ◽  
Mixing Patterns ◽  
Sex With Men ◽  
The Relationship ◽  
Hiv Negative

Abstract Using cross-sectional survey data (Engage, 2017–2018) from 1,137 men who have sex with men, ≥16 years old, in Montreal, we compared observed human immunodeficiency virus (HIV) seroconcordance in previous-6-months’ sexual partnerships with what would have been observed by chance if zero individuals serosorted. Of 5 recent partnerships where both individuals were HIV-negative, we compared observed concordance in preexposure prophylaxis (PrEP) use with the counterfactual if zero individuals selected partners based on PrEP use. We estimated the concordance by chance using a balancing-partnerships approach assuming proportionate mixing. HIV-positive respondents had a higher proportion of HIV-positive partners (66.4%, 95% confidence interval (CI): 64.0, 68.6) than by chance (23.9%, 95% CI: 23.1, 24.7). HIV-negative respondents (both on and not on PrEP) had higher proportions of HIV-negative partners (82.9% (95% CI: 81.1, 84.7) and 90.7% (95% CI: 89.6, 91.7), respectively) compared with by chance (76.1%, 95% CI: 75.3, 76.9); however, those on PrEP had a higher proportion of HIV-positive partners than those not on PrEP (17.1% (95% CI: 15.3, 18.9) vs. 9.3% (95% CI: 8.3, 10.4). Those on PrEP also had a higher proportion of partners on PrEP among their HIV-negative partners (50.6%, 95% CI: 42.5, 58.8) than by chance (28.5%, 95% CI: 27.5, 29.4). The relationship between PrEP and sexual-mixing patterns demonstrated by less population-level serosorting among those on PrEP and PrEP-matching warrants consideration during PrEP roll-out.

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