Attending Melbourne Sexual Health Centre Research Articles

Reproductive health among women living with HIV attending Melbourne Sexual Health Centre for HIV care from February 2019 to February 2020.

Women living with HIV are a minority population with unique care needs. Rates of unintended pregnancy are higher among women living with HIV versus HIV negative women. However, uptake of contraception among women living with HIV including long-acting-reversible contraceptives (LARCs) remains low. This quality improvement project aimed to identify gaps in reproductive healthcare for women living with HIV attending Melbourne Sexual Health Centre (MSHC). We performed a retrospective review of women living with HIV attending MSHC for HIV care February 2019-February 2020. Women aged over 45years were excluded. Primary outcomes included proportion using contraception, methods used and whether a sexual or reproductive health history had been taken in the past year. A total of 100 women were included, predominantly born overseas (Asia, 38%; sub-Saharan Africa, 34%). Of these, 5% were pregnant, 16% were trying to conceive and 1% were undergoing elective oocyte preservation. Of the remaining 74 women, 48.6% were using any form of contraception, including 17.6% women using less-effective methods (withdrawal and condoms), 6.8% using the combined oral contraceptive pill, 18.9% using LARCs and 5.4% using permanent methods. Sexual activity status was documented for 61% women, 1% declined to answer and not documented for 38% women. Rate of contraceptive use in this study was lower than previously reported among women living with HIV in Australia; however, our findings suggest contraceptive methods may be changing in light of undetectable equals untransmittable and increased fertility desires. Discussions regarding sexual activity and reproductive health were limited. Mechanisms to increase clinician-patient discourse regarding these important issues should be explored.

Newly arrived Asian-born gay men in Australia: exploring men\u2019s HIV knowledge, attitudes, prevention strategies and facilitators toward safer sexual practices

BackgroundAsian-born gay, bisexual and other men who have sex with men (gbMSM) newly arrived in Australia are more than four times as likely than their Australian-born counterparts to be diagnosed with incident HIV. Our aim was to explore experiences of Asian-born gbMSM newly arrived in Australia and attending a sexual health centre with regards to their knowledge of and preference for HIV prevention strategies.ResultsTwenty-four gbMSM aged 20–30 years attending Melbourne Sexual Health Centre who were born in Asia and arrived in Australia in the preceding four years, participated in semi-structured face-to-face interviews from 8th May 2019 and 23rd December 2019. Men were excluded if they were living with HIV. Interviews were recorded, transcribed verbatim and analysed thematically. Men reported little knowledge of HIV prevention strategies outside of condom use prior to coming to Australia. Although participants reported basic knowledge of HIV transmission and treatment, exposure to sexual identity and HIV-related stigma in their countries of birth meant they imagined a HIV diagnosis would be devastating. Most relied on condoms to stay HIV negative however their consistency of use varied. Seven men were on pre-exposure prophylaxis (PrEP); all but one started PrEP after coming to Australia. Many indicated interest in PrEP but described it as too expensive given they do not have access to government-subsidized healthcare. Sexual health counselling and connections with LGBTQI community groups appeared to facilitate PrEP and consistent condom use.ConclusionsAsian-born gbMSM newly-arrived to Australia may have limited knowledge of HIV prevention strategies aside from condom use. Increased connections with sexual health services and LGBTQI communities may facilitate more effective HIV prevention strategies.

Potential effect of antiseptic mouthwash on the incidence of Neisseria gonorrhoeae among men who have sex with men: a mathematical modelling study

ObjectivesThe incidence of Neisseria gonorrhoeae and its antimicrobial resistance is increasing in many countries. Antibacterial mouthwash may reduce gonorrhoea transmission without using antibiotics. We modelled the effect that antiseptic mouthwash...

The clinical indications for testing women for Mycoplasma genitalium

BackgroundWhile the contribution of Mycoplasma genitalium (MG) to symptoms in men is well described, less is known about its association with common genital symptoms in women. We aimed to determine...

"Moving from one environment to another, it doesn't automatically change everything". Exploring the transnational experience of Asian-born gay and bisexual men who have sex with men newly arrived in Australia.

Asian-born gay, bisexual and other men who have sex with men (gbMSM) who are newly arrived in Australia are at a higher risk of acquiring HIV than Australian-born gbMSM. We used a social constructionist framework to explore HIV knowledge and prevention strategies used by newly-arrived Asian-born gbMSM. Twenty four Asian-born gbMSM, aged 20-34 years, attending Melbourne Sexual Health Centre, who arrived in Australia in the preceding five years, participated in semi-structured, face-to-face interviews. Interviews were recorded, transcribed verbatim and analysed thematically. Participants described hiding their sexual identities in their country of origin, particularly from family members, due to fear of judgement and discrimination resulting from exposure to sexual identity and HIV related stigma in their countries of origin, although some were open to friends. Despite feeling more sexual freedom and acceptance in Australia, many were still not forthcoming with their sexual identity due to internalised feelings of stigma and shame. Exposure to stigma in their country of origin led many to report anxiety around HIV testing in Australia due to a fear of testing positive. Some described experiencing racism and lack of acceptance in the gay community in Australia, particularly on dating apps. Fear of discrimination and judgement about their sexual identity can have a significant impact on Asian-born gbMSM living in Australia, particularly in terms of social connectedness. Additionally, HIV-related stigma can contribute to anxieties around HIV testing. Our data highlights the potential discrimination Asian-born gbMSM face in Australia, which has implications for social connectedness, particularly with regard to LGBTQI communities and HIV testing practices. Future studies should determine effective strategies to reduce sexual identity and HIV-related stigma in newly-arrived Asian-born gbMSM.

Disparities in characteristics in accessing public Australian sexual health services between Medicare‐eligible and Medicare‐ineligible men who have sex with men

ObjectivesAccessible health services are a key element of effective human immunodeficiency virus (HIV) and sexually transmitted infection (STI) control. This study aimed to examine whether there were any differences in accessing sexual health services between Medicare‐eligible and Medicare‐ineligible men who have sex with men (MSM) in Melbourne, Australia. MethodsWe conducted a retrospective, cross‐sectional study of MSM attending Melbourne Sexual Health Centre between 2016 and 2019. Demographic characteristics, sexual practices, HIV testing practices and STI diagnoses were compared between Medicare‐eligible and Medicare‐ineligible MSM. ResultsWe included 5,085 Medicare‐eligible and 2,786 Medicare‐ineligible MSM. Condomless anal sex in the past 12 months was more common in Medicare‐eligible compared to Medicare‐ineligible MSM (74.4% vs. 64.9%; p<0.001) although the number of partners did not differ between groups. There was no difference in prior HIV testing practices between Medicare‐eligible and Medicare‐ineligible MSM (76.1% vs. 77.7%; p=0.122). Medicare‐ineligible MSM were more likely to have anorectal chlamydia compared to Medicare‐eligible MSM (10.6% vs. 8.5%; p=0.004). ConclusionsMedicare‐ineligible MSM have less condomless sex but a higher rate of anorectal chlamydia, suggesting they might have limited access to STI testing or may be less willing to disclose high‐risk behaviour. Implications for public healthScaling up access to HIV and STI testings for Medicare‐ineligible MSM is essential.

Predicting the Diagnosis of HIV and Sexually Transmitted Infections Among Men Who Have Sex with Men Using Different Machine Learning Approaches

Background: We aimed to develop models and evaluate their performance of machine learning approaches in predicting the diagnosis of HIV and sexually transmitted infections (STIs) based on a large retrospective cohort of Australian men who have sex with men (MSM). Methods: We collected demographic, clinical, behavioural and laboratory information from the clinic records of 21273 MSM who attended Melbourne Sexual Health Centre (MSHC), Australia between 2011-2017. We limited the analysis of three STIs (syphilis, gonorrhoea, chlamydia) to the period of January 2015 to December 2017. We compared the accuracy for predicting the diagnosis of HIV and three STIs using four machine learning approaches against a multivariable logistic regression (MLR) model. Findings: HIV was diagnosed in 436/18505 MSM (436 diagnoses/58121 consultations), syphilis in 741/13820 MSM (810 diagnoses/38490 consultations), gonorrhoea in 3258/10802 MSM (4382 diagnoses/25011 consultations), and chlamydia in 2836/7708 MSM (3918 diagnoses/13926 consultations). Machine learning approaches more accurately predicted each infection than MLR. Gradient boosting machine (GBM) was the most accurate and achieved the highest area under the receiver operator characteristic curve for HIV (76·3%) and STIs (syphilis, 85·8%; gonorrhoea, 75·5%; chlamydia, 68·0%), followed by extreme gradient boosting (71·1%, 82·2%, 70·3%, 66·4%), random forest (72·0%, 81·9%, 67·2%, 64·3%), deep learning (75·8%, 81·0%, 67·5%, 65·4%), and MLR (69·8%, 80·1%, 67·2%, 63·2%). The trained GBM models demonstrated that the ten greatest predictors collectively explained 62·7-73·6% of variations in predicting the diagnosis of HIV/STIs. Among which, STIs symptoms, past syphilis infection, age, time living in Australia, frequency of condom use with casual male sexual partners during receptive anal sex and the number of casual male sexual partners in the past 12 months were predictors most commonly identified by the models. Interpretation: Machine learning approaches are advantageous over multivariable logistic regression models in predicting the diagnosis of HIV/STIs. Funding Statement: Australian NHMRC Leadership Investigator Grant (GNT1172900) Declaration of Interests: LZ is supported by the National Natural Science Foundation of China (8191101420); Thousand Talents Plan Professorship for Young Scholars (3111500001); Xi'an Jiaotong University Young Talent Support Program; Xi’an Jiaotong University Basic Research and Profession Grant (xtr022019003). CKF is supported by an Australian NHMRC Leadership Investigator Grant (GNT1172900). EPFC is supported by an Australian National Health and Medical Research Council (NHMRC) Emerging Leadership Investigator Grant (GNT1172873). XZ is supported by National Science and Technology Major Project of China (2018ZX10721102); The key Project of Philosophy and Social Sciences Research in Jiangsu Education Department of China (2018SJZDI123); Nantong Municipal Bureau of Science and Technology, China (MS12018001, HS2016002 ). All other authors declare no competing interests. Ethics Approval Statement: The datasets were completely de-identified and not re-identifiable. Ethical approval was granted by the Alfred Hospital Ethics Committee, Australia (project number: 124/18).

International travel as risk factor for Chlamydia trachomatis infections among young heterosexuals attending a sexual health clinic in Melbourne, Australia, 2007 to 2017.

BackgroundInternational travel is considered a risk factor for acquiring Chlamydia trachomatis; however, there are little empirical data to support this.AimTo examine the prevalence and risk factors for Chlamydia trachomatis infections among heterosexual international travellers (n = 28,786) attending the Melbourne Sexual Health Centre (MSHC), Australia, compared to Australian residents (n = 20,614).MethodsWe conducted a repeated cross-sectional study and analysed sexual behaviours and chlamydia positivity among heterosexual males and females aged ≤ 30 attending MSHC for the first time between January 2007 and February 2017. ‘Travellers’ were defined as individuals born outside of Australia who had resided in the country < 2 years. Associations between patient characteristics and chlamydia positivity were examined.ResultsChlamydia positivity was higher among travellers (11.2%) compared with Australian residents (8.5%; p < 0.001). Male travellers had higher chlamydia positivity (12.1%) than Australian males (9.3%; p < 0.001), as did female travellers (10.4%) compared with Australian females (7.7%; p < 0.001). Travellers had a higher mean number of sexual partners than Australian residents among males (5.7 vs 4.7; p < 0.001) and females (3.6 vs 3.2; p < 0.001). Travellers from the United Kingdom, Europe, Ireland and New Zealand accounted for 29.6%, 21%, 8.5% and 5.8% of C. trachomatis infections, respectively. Chlamydia in males and females was associated with younger age (≤ 25), inconsistent condom use, a higher number of sexual partners (≥ 4 partners) and being a traveller (p < 0.001).ConclusionsWe found that international travel is an independent risk factor for chlamydia among young heterosexual travellers in Australia, who should therefore be a target group for chlamydia prevention.

Resistance-Guided Antimicrobial Therapy Using Doxycycline-Moxifloxacin and Doxycycline-2.5 g Azithromycin for the Treatment of Mycoplasma genitalium Infection: Efficacy and Tolerability.

Macrolide resistance in Mycoplasma genitalium (MG) exceeds 50% in many regions, and quinolone resistance is increasing. We recently reported that resistance-guided therapy (RGT) using doxycycline followed by sitafloxacin or 2.5 g azithromycin cured 92% and 95% of macrolide-resistant and macrolide-susceptible infections, respectively. We present data on RGT using doxycycline-moxifloxacin, the regimen recommended in international guidelines, and extend data on the efficacy of doxycycline-2.5 g azithromycin and de novo macrolide resistance. Patients attending Melbourne Sexual Health Centre between 2017 and 2018 with sexually transmitted infection syndromes were treated with doxycycline for 7 days and recalled if MG-positive. Macrolide-susceptible cases received 2.5 g azithromycin (1 g, then 500 mg daily for 3 days), and resistant cases moxifloxacin (400 mg daily, 7 days). Test of cure was recommended 14-28 days post-antimicrobials. There were 383 patients (81 females/106 heterosexual males/196 men who have sex with men) included. Microbial cure following doxycycline-azithromycin was 95.4% (95% confidence interval [CI], 89.7-98.0) and doxycycline-moxifloxacin was 92.0% (95% CI, 88.1-94.6). De novo macrolide resistance was detected in 4.6% of cases. Combining doxycycline-azithromycin data with our prior RGT study (n = 186) yielded a pooled cure of 95.7% (95% CI, 91.6-97.8). ParC mutations were present in 22% of macrolide-resistant cases. These findings support the inclusion of moxifloxacin in resistance-guided strategies and extend the evidence for 2.5 g azithromycin and presumptive use of doxycycline. These data provide an evidence base for current UK, Australian, and European guidelines for the treatment of MG.

Evidence for a new paradigm of gonorrhoea transmission: cross-sectional analysis of Neisseria gonorrhoeae infections by anatomical site in both partners in 60 male couples

ObjectiveGonorrhoea transmission between men is currently thought to occur primarily to and from the urethra. Transmission without urethral involvement, from throat-to-throat and throat-to-anus, is considered to be uncommon. Using gonorrhoea...

Risk factors for urethral gonorrhoea infection among heterosexual males in Melbourne, Australia: 2007-17.

Retrospective analysis was performed among heterosexual males attending Melbourne Sexual Health Centre (MSHC) between 1 January 2007 and 31 December 2017. Countries for overseas sexual partners were stratified as high-prevalence countries (HPC) or low-prevalence countries (LPC) based on the incidence of gonorrhoea. The annual gonorrhoea positivity increased from 0.72% in 2007 to 1.33% in 2017 (Ptrend <0.001). Males attending MSHC as a contact of gonorrhoea had the highest odds of testing positive (adjusted odds ratio (aOR) 7.46; 95% confidence interval (CI) 4.46-12.49), followed by males identifying as Aboriginal and Torres Strait Islander (aOR 2.57; 95% CI 1.30-5.09), males who had injected drugs in the past 12 months (aOR 2.44; 95% CI 1.39-4.30) and males who had sex with a female from an HPC (aOR 2.18; 95% CI 1.77-2.68). Males aged ≥35 were at higher risk than those aged ≤24 years (aOR 1.44; 95% CI 1.14-1.82). Gonorrhoea positivity increased among males who had sex with females from an LPC (from 0.60% to 1.33%; Ptrend = 0.004) but remained the same over time among males who had sex with females from an HPC (2.14%; Ptrend = 0.143). There was an 80% increase in urethral gonorrhoea among heterosexual males between 2007 and 2017. Having sex with a female from an HPC is a significant risk factor for gonorrhoea. Gonorrhoea positivity among men having sex with a female from an HPC did not change over time, suggesting this risk factor has become less important.

Non-consensual condom removal, reported by patients at a sexual health clinic in Melbourne, Australia.

BackgroundNon-consensual removal of condoms, colloquially referred to as ‘stealthing’, is the removal of a condom during sex by a sexual partner when consent has been given for sex with a condom only.MethodsWe conducted a cross-sectional survey to determine how commonly women and men who have sex with men (MSM) attending Melbourne Sexual Health Centre had experienced stealthing, and analysed situational factors associated with the event. Responses were linked to demographic information extracted from patient files.Results1189 of 2883 women (41.2%), and 1063 of 3439 MSM (30.9%) attending the clinic during the study period completed the survey. Thirty-two percent of women (95% CI: 29%,35%) and 19% of MSM (95% CI: 17%,22%) reported having ever experienced stealthing. Women who had been stealthed were more likely to be a current sex worker (Adjusted Odds Ratio [AOR] 2.87, 95% CI: 2.01,4.11, p <0.001). MSM who had experienced stealthing were more likely to report anxiety or depression (AOR 2.13, 95% CI: 1.25,3.60, p = 0.005). Both female and male participants who had experienced stealthing were three times less likely to consider it to be sexual assault than participants who had not experienced it (OR 0.29, 95% CI: 0.22,0.4 and OR 0.31, 95% CI: 0.21,0.45 respectively).ConclusionsA high proportion of women and MSM attending a sexual health service reported having experienced stealthing. While further investigation is needed into the prevalence of stealthing in the general community, clinicians should be aware of this practice and consider integrating this question into their sexual health consultation. Understanding situational factors would assist in the development of preventive strategies, particularly female sex workers and MSM.

Clinical Characteristics of Anorectal Mycoplasma genitalium Infection and Microbial Cure in Men Who Have Sex With Men.

We report clinical characteristics of proctitis caused solely by Mycoplasma genitalium (MG) compared with chlamydia and gonococcus. We determined the proportions cured with first-line (azithromycin) and second-line antimicrobials (moxifloxacin, pristinamycin). A total of 166 patients attending Melbourne Sexual Health Centre from 2012 to 2016 with symptoms of proctitis were tested for MG, Chlamydia trachomatis, and Neisseria gonorrhoeae. Demographic characteristics, sexual behaviors, clinical symptoms, and signs were recorded. Multinomial multivariable logistic regression was used to test for significant differences in symptoms and signs for the pathogens detected. Seventeen percent of men had MG (95% confidence interval, 12-24), 21% had chlamydia (15-27), and 40% had gonococcal monoinfection (32-48), whereas 22% had MG coinfection (16-29). Relative to men with MG monoinfection, those with chlamydial monoinfection reported more anal pain (adjusted prevalence odds ratio (aPOR), 4.68 [1.41-14.19]), whereas men with gonococcal monoinfection reported more anal pain (aPOR, 6.75 [2.21-20.55]) and tenesmus (aPOR, 15.44 [1.62-146.90]), but less anal itch (aPOR, 0.32 [0.11-0.93]). The microbiological cure for MG using azithromycin was low at 35% (22-50), whereas moxifloxacin subsequently cured 92% (64-100) and pristinamycin cured 79% (54-94) of infections. M. genitalium was almost as common as chlamydia in men presenting to a sexual health center with symptoms of proctitis. Men with anorectal MG monoinfection were less likely to have symptoms and signs compared with those with chlamydia or gonococcus monoinfection. Cure for men with symptomatic anorectal MG by azithromycin was low. We suggest routine testing for MG in cases of proctitis, with test of cure after treatment being essential.

Concordance of gonorrhoea of the rectum, pharynx and urethra in same-sex male partnerships attending a sexual health service in Melbourne, Australia

BackgroundWe aimed to describe anatomic site-specific concordance of gonococcal infections in partnerships of men who have sex with men (MSM).MethodsWe conducted a cross-sectional analysis of data from MSM partnerships attending Melbourne Sexual Health Centre between March 2011 and February 2015. Logistic regression models (random effect) were used to examine the association between gonococcal infections of the urethra, rectum and pharynx. Gonococci were detected by culture at all anatomic sites.ResultsThe analysis included 495 partnerships. Of the men with urethral gonorrhoea, 33% (95% CI 18–52) had partners with pharyngeal gonorrhoea and 67% (95% CI 48–82) had partners with rectal gonorrhoea. The adjusted odds of having urethral gonorrhoea was 4.6 (95% CI 1.2–17.1) for a man whose partner had pharyngeal gonorrhoea, and 48.1 (95% CI 18.3–126.7) for a man whose partner had rectal gonorrhoea. Of the men with rectal gonorrhoea, 46% (95% CI 31–61) had a partner with urethral gonorrhoea and 23% (95% CI 12–37) had a partner with pharyngeal gonorrhoea. The adjusted odds of having rectal gonorrhoea was 63.9 (95% CI 24.7–165.6) for a man whose partner had urethral gonorrhoea. Of the men with pharyngeal gonorrhoea, 42% (95% CI 23–63) had a partner with rectal gonorrhoea and 23% (95% CI 9–44) had a partner with had a partner with pharyngeal gonorrhoea. The adjusted odds of having pharyngeal gonorrhoea was 8.9 (95% CI 3.2–24.6) for a man whose partner had rectal gonorrhoea. The crude odds of having pharyngeal gonorrhoea was 14.2 (95% CI 5.1–39.0) for a man whose partner had pharyngeal gonorrhoea.ConclusionsThese data provide the first estimates of concordance of anatomic site-specific gonococcal infections in MSM partnerships, and confirm that urethral gonorrhoea is contracted from both rectal and pharyngeal sites, and suggest that gonococci transmit between the rectum and pharynx. However, due to use of culture rather than NAAT, our analysis was not adequately powered to assess pharynx-to-pharynx transmission of gonococci.

The frequency of kissing as part of sexual activity differs depending on how men meet their male casual sexual partners.

Previous studies have shown that men who have sex with men (MSM) who use smartphone dating applications (apps) are at higher risk of gonorrhoea, but not HIV. We have hypothesised that kissing may be a risk factor for oropharyngeal gonorrhoea. We measured differences in kissing practices among MSM who use different methods to find male casual sexual partners (CSPs). If MSM who use apps kiss more CSPs, then this may help to explain why these men are at increased risk of gonorrhoea but not HIV. This was a cross-sectional questionnaire-based study of MSM attending Melbourne Sexual Health Centre, Australia, between March and September 2015. We measured differences in kissing practices among MSM who use different methods to find male casual sexual partners (CSPs). The questionnaire included questions about numbers of CSPs, numbers of CSPs kissed, and how men found CSPs. We surveyed 753 MSM with a median age of 29 years (interquartile range 25-36). Six hundred and one men (79.8%) reported using apps to find CSPs in the last three months. Users of apps had a higher number of CSPs than non-users (5.0 vs. 3.2; p < 0.001). Users of apps kissed a higher number (4.6 vs. 2.2; p < 0.001), and a higher proportion (90.4% vs. 71.0%; p < 0.001) of CSPs compared to non-users. We are currently investigating whether kissing is a significant mode of transmission of gonorrhoea, and if this proves correct then this study suggests that users of apps would particularly benefit from health promotion that addresses this mode of transmission.

Clinical factors associated with syphilis concordance in men in sexual partnerships: a cross-sectional couples study

BackgroundSyphilis infections continue to increase among men who have sex with men (MSM) in many countries, with rates often higher among HIV-positive MSM. There is limited understanding of the risk...

Detection of human papillomavirus in urine among heterosexual men in relation to location of genital warts and circumcision status

ObjectiveHuman papillomavirus (HPV) surveillance is important to monitor the effectiveness of national HPV vaccination programmes. Positivity of HPV in urine in men varies with different sampling methods. We aimed to...

Concordance of chlamydia infections of the rectum and urethra in same-sex male partnerships: a cross-sectional analysis

BackgroundOur study aimed to describe the concordance of chlamydia infections of the rectum and urethra in men who have sex with men (MSM) and their male partners.MethodsThis was a cross-sectional study of chlamydia in MSM and their male sexual partners both attending Melbourne Sexual Health Centre (MSHC), Australia, between February 2011 and March 2015. We excluded partnerships where testing for chlamydia at both the rectum and urethra were not undertaken.ResultsOur study included 473 partnerships (946 men). 30 men had urethral chlamydia, of whom 14 (47%, 95% CI 28 to 66) had a partner with rectal chlamydia. 46 men had rectal chlamydia, of whom 14 (30%, 95% CI 18 to 46) had a partner with urethral chlamydia. The proportion of men with rectal chlamydia when their partner had urethral chlamydia was significantly higher than the proportion of men with urethral chlamydia when their partner had rectal chlamydia (McNemar’s p = 0.02).ConclusionsThis is the first study of chlamydia concordance in male sexual partnerships and suggests that transmission of chlamydia between the urethra and rectum may be less efficient than has been reported for transmission between the urethra and cervix in heterosexual couples. It also suggests that transmission from the urethra to the rectum may be more efficient than in the opposite direction.

Patterns of sexual behaviour and sexual healthcare needs among transgender individuals in Melbourne, Australia, 2011–2014

ObjectiveLiterature surrounding the healthcare needs of transgender individuals is limited in Australia. This study aimed to investigate the demographic characteristics, risk behaviours and HIV/STI positivity among male-to-female (MTF) and female-to-male...

HIV Incidence and Predictors of Incident HIV among Men Who Have Sex with Men Attending a Sexual Health Clinic in Melbourne, Australia.

IntroductionThe aim of this study was to determine the risk factors for HIV infection and the incidence in men who have sex with men (MSM). It is important to identify subgroups of MSM in which preventive interventions such as pre-exposure prophylaxis (PrEP) offered at the time of their last negative test would be considered cost-effective.MethodsWe conducted a retrospective cohort study of MSM attending Melbourne Sexual Health Centre (MSHC) during 2007–2013 with at least two HIV tests within 12 months of each other. Demographic characteristics, sexual and other behaviours, and bacterial sexually transmitted infection (STI) diagnoses were extracted from the date of the last negative HIV test. HIV incidence rate (IR) per 100 person-years for each risk factor was calculated.ResultsOf the 13907 MSM who attended MSHC, 5256 MSM had at least two HIV tests and were eligible, contributing 6391 person-years follow-up. 81 new HIV diagnoses were identified within 12 months of an HIV negative test with an incidence of 1.3 (95% CI: 1.0–1.6) per 100 person-years. Significant associations with subsequent HIV infection were: rectal gonorrhea (HIV IR: 3.4 95% CI: 2.1–5.2), rectal chlamydia (HIV IR: 2.6 95% CI: 1.7–3.7), inconsistent condom use (HIV IR: 2.1 95% CI: 1.6–2.7), use of post-exposure prophylaxis (HIV IR: 2.3 95% CI: 1.7–3.1), and injecting drug use (HIV IR: 8.5 95% CI: 3.4–17.5).ConclusionThe incidence of HIV was above 2.0% in subgroups of MSM with specific characteristics at the last HIV negative test. PrEP is considered cost effective at this incidence and could potentially be used along with other preventive interventions for these individuals in more than half of the population.