A Scoping Review of HIV Pre-exposure Prophylaxis Stigma and Implications for Stigma-Reduction Interventions for Men and Transwomen Who Have Sex with Men.

HIV remains a public health concern in the United States. Although pre-exposure prophylaxis (PrEP) can be expected to reduce HIV incidence, its uptake, adherence, and persistence remain limited, particularly among highest priority groups such as men who have sex with men and transwomen (MSMTW). Using a socioecological framework, we conducted a scoping review to examine PrEP-related stigma to inform future research, policy, and programmatic planning. Using the PRISMA extension for scoping reviews, we conducted database searches from August 2018 to April 2020 for articles addressing PrEP stigma. Studies were independently screened and coded by three authors, resulting in thematic categorization of several types of PrEP stigma on four socioecological levels. Of 557 references, a final sample of 23 studies was coded, 61% qualitative, and 87% focusing exclusively on MSMTW. Most instances of PrEP-related stigma occurred on the interpersonal level and included associations of PrEP with risk promotion, HIV-related stigma, and promiscuity. Other frequent themes across socioecological levels included provider distrust and discrimination, government and pharmaceutical industry distrust, internalized homonegativity, PrEP efficacy distrust, and anticipated homonegativity. Notably, PrEP was also framed positively as having physical and psychological benefits, and assuming responsibility for protecting one's community via PrEP awareness-raising. PrEP-related stigma persists, demanding interventions to modify its impact. Leveraging PrEP-positive discourses to challenge PrEP stigma is an emerging avenue, alongside efforts to increase provider willingness to promote PrEP routinely by reducing provider bias, aligning with the national strategy to End the HIV Epidemic.

The Role of Social Support in HIV Testing and PrEP Awareness among Young Black Men and Transgender Women Who Have Sex with Men or Transgender Women.

Young black men and transgender women (transwomen) who have sex with men or transwomen are most vulnerable in terms of risk for HIV infection, also reflected in their extremely high incidence rates. As testing rates and pre-exposure prophylaxis (PrEP) uptake remain suboptimal among these groups, primarily due to unique structural barriers, the present analyses draw on data from an online survey, administered October 2014 to August 2015, to explore social support-related predictors of knowledge and behavior around HIV prevention.Participants were 169 biological men who identified as black, with a mean age of 24 (SD = 2.97, range 17-29); 8% identified as transwomen. Logistic regression models assessed whether HIV-related social support predicted HIV testing patterns, PrEP awareness, and use. Those with higher HIV-related social support reported having been more likely to have ever tested (adjusted odds ratio (aOR) = 1.48; p < 0.001) and tested in the past 6 months (aOR = 1.22; p < 0.01). They were also more likely to intend to test in the next 6 months (aOR = 1.16; p < 0.001), including at a medical office or community-based organization (aOR = 1.20; p < 0.001), yet less likely to intend to self-test (aOR = 0.81; p < 0.001). Lastly, higher social support was significantly associated with prior knowledge of self-testing (aOR = 1.19; p < 0.05), couples testing (aOR = 1.26; p < 0.001), and PrEP (aOR = 1.22; p < 0.01), as well as prevention self-efficacy (aOR = 1.30; p < 0.001), but inversely associated with prior self-testing (aOR = 0.80; p < 0.05). For young black men and transwomen who have sex with men or transwomen, HIV-related social support, which likely has a strong peer component, appears to be a facilitator of optimal testing and intentions to test, as well as awareness of novel prevention strategies (like self-testing or PrEP). However, community resourcefulness needs to be bolstered by other mechanisms, such as changes within healthcare settings, to increase actual use of novel prevention modalities.

The Roles of Gender Affirmation and Discrimination in the Resilience of Transgender Individuals in the US.

Transgender individuals face severe stigma-driven health inequities structurally, institutionally, and interpersonally, yielding poor individual-level outcomes. Gender affirmation, or being recognized based on one's gender identity, expression, and/or role, may be considered a manifestation of resilience. To provide intervention and policy guidelines, we examined latent constructs representative of gender affirmation (legal documentation changes, transition-related medical procedures, familial support) and discrimination (unequal treatment, harassment, and attacks), and tested their impact on mental, physical, and behavioral health outcomes among 17,188 binary-identified transgender participants in the 2015 US Transgender Survey. Confirmatory factor analyses revealed high standardized factor loadings for both latent variables, on which we regressed outcomes using structural equation modeling. Fit indices suggested good model fit. Affirmation was associated with lower odds of suicidal ideation and psychological distress, and higher odds of substance use, and past-year healthcare use and HIV-testing. Discrimination was associated with higher odds of suicidal ideation, psychological distress, substance use, and past-year HIV-testing. Affirmation and discrimination interaction analyses showed lower odds of past-year suicidal ideation, with affirmation having a significant moderating protective effect against discrimination. Gender affirmation is paramount in upholding transgender health. Clarification of affirmation procedures, and increases in its accessibility, equitably across racial/ethnic groups, should become a priority, from policy to the family unit. The impact of discrimination demands continued advocacy via education and policy.

The Role of Gay-Related Stigma in HIV-Risk Behavior Among Sexual Minority Men in Europe.

Sexual orientation stigma stems from discriminatory social contexts and may ultimately impact the behavioral health of stigmatized individuals through stress-related pathways. Sexual minority stigma is of particular concern in Europe given the diversity of social contexts on the continent and sexual minority men's rapidly increasing risk of HIV infection, especially in Central and Eastern Europe, potentially rooted in stigma. This study assesses whether stigma in the ubiquitous social contexts surrounding sexual minority men (e.g., family, workplace, government) may place them at higher risk for HIV contraction across six countries. We utilized a large cross-sectional survey sample of HIV-negative sexual minority men (N = 2087; mean age = 31.6, SD = 9.7) from six European countries to test whether those who reported sexual orientation stigma also engaged in more HIV risk-related behaviors, including condomless sex with casual partners (in the absence of PrEP) and substance use before and during sex. Regression analyses were performed in Mplus. We found that a one standard deviation increase in reported sexual orientation stigma was significantly associated with the following during the last sexual encounter: a 19% increase in odds of sex under the influence of alcohol, 27% increase in odds of sex under the influence of cannabis, 49% increase in odds of sex under the influence of illicit drugs, an 11% increase in odds of condomless sex with casual partners in the past 6 months, and a 26% increase in odds of knowing where to receive an HIV test. Sexual minority men who reported perceiving greater sexual orientation-related stigma within their ubiquitous social contexts were significantly more likely to report sexual risk and alcohol and drug use during their last sexual encounter, yet reported more knowledge of preventive services. Contextual stigma might serve as a precursor to behavioral risks of HIV infection, generating maladaptive stress responses capable of being modified through individually-focused interventions. Structural interventions are also needed to ultimately reduce stigma at its source.

The Importance of Sexual History Taking for PrEP Comprehension Among Young People of Color.

Despite demonstrated efficacy, uptake of pre-exposure prophylaxis (PrEP) remains low, especially among highest priority populations. This study examined four PrEP messaging factors hypothesized to impact comprehension of PrEP educational information: (1) modality (video versus in-person message delivery); (2) frame (risk versus health focus); (3) specificity (gist versus verbatim efficacy information); and (4) sexual history (administered either before or after PrEP education). We examined message comprehension among 157 young people of color (YPoC) eligible for PrEP, using a series of multiple choice questions. Overall, 65.6 % (n = 103) got all message comprehension questions correct. In multivariate analyses, engaging in a sexual history before receiving PrEP education was associated with increased odds of message comprehension (aOR 2.23; 95 % CI 1.06-4.72). This effect was even stronger among those who received PrEP education via video (aOR 3.53; 95 % CI 1.16-10.81) compared to via health educator. This research underscores the importance of sexual history-taking as part of PrEP education and clinical practice for YPoC, and suggests that engaging patients in a sexual history prior to providing them with PrEP education may be key to increasing comprehension.

Feasibility, Acceptability, and Preliminary Efficacy of a Live-Chat Social Media Intervention to Reduce HIV Risk Among Young Men Who Have Sex With Men.

Given the popularity of social media among young men who have sex with men (YMSM), and in light of YMSM's elevated and increasing HIV rates, we tested the feasibility, acceptability and preliminary efficacy of a live chat intervention delivered on Facebook in reducing condomless anal sex and substance use within a group of high risk YMSM in a pre-post design with no control group. Participants (N = 41; 18-29 years old) completed up to eight one-hour motivational interviewing and cognitive behavioral skills-based online live chat intervention sessions, and reported on demographic, psychosocial, and behavioral characteristics at baseline and immediately post-intervention. Analyses indicated that participation in the intervention (n = 31) was associated with reductions of days of drug and alcohol use in the past month and instances of anal sex without a condom (including under the influence of substances), as well as increases in knowledge of HIV-related risks at 3-month follow-up. This pilot study argues for the potential of this social media-delivered intervention to reduce HIV risk among a most vulnerable group in the United States, in a manner that was highly acceptable to receive and feasible to execute. A future randomized controlled trial could generate an intervention blueprint for providers to support YMSM's wellbeing by reaching them regardless of their geographical location, at a low cost.

Prepare Romania: study protocol for a randomized controlled trial of an intervention to promote pre-exposure prophylaxis adherence and persistence among gay, bisexual, and other men who have sex with men.

BACKGROUND: Gay, bisexual, and other men who have sex with men (GBMSM) represent a high-risk group for HIV transmission in Romania, yet they possess few resources for prevention. Despite having no formal access to pre-exposure prophylaxis (PrEP) through the health system, GBMSM in Romania demonstrate a high need for and interest in this medication. In anticipation of a national rollout of PrEP, this study tests the efficacy of a novel strategy, Prepare Romania, that combines two evidence-based PrEP promotion interventions for GBMSM living in Romania. METHODS: This study uses a randomized controlled trial design to examine whether GBMSM living in Romania receiving Prepare Romania, a culturally adapted counseling and mobile health intervention (expected n = 60), demonstrate greater PrEP adherence and persistence than those assigned to a PrEP education control arm (expected n = 60). Participants from two main cities in Romania are prescribed PrEP and followed-up at 3 and 6 months post-randomization. PrEP adherence data are obtained through weekly self-report surveys and dried blood spot testing at follow-up visits. Potential mediators (e.g., PrEP use motivation) of intervention efficacy are also assessed. Furthermore, Prepare Romania's implementation (e.g., proportion of enrolled participants attending medical visits, intervention experience) will be examined through interviews with participants, study implementers, and healthcare officials. DISCUSSION: The knowledge gained from this study will be utilized for further refinement and scale-up of Prepare Romania for a future multi-city effectiveness trial. By studying the efficacy of tools to support PrEP adherence and persistence, this research has the potential to lay the groundwork for PrEP rollout in Romania and similar contexts. Trial registration This study was registered on ClinicalTrials.gov, identifier NCT05323123 , on March 25, 2022.

Predictors of day-level sexual risk for young gay and bisexual men.

As HIV infection rates remain high among young gay and bisexual men, investigations into determinants of sexual risk are paramount. This study examined independent and interactive effects of substance use, mental health, perceived benefits of unprotected sex, and type of sex partner on odds of not using condoms. Analyses included 188 high-risk substance using HIV-negative and unknown status young gay and bisexual men (ages 18-29). Substance use and endorsing favorable attitudes towards unprotected sex strongly predicted sexual risk. Mental health moderated the relationship between partner type (main vs. casual) and condom use such that increased anxiety and depression were associated with increased odds of using condoms with main partners and not using condoms with casual partners. Understanding how these determinants of HIV risk converge to predict unprotected anal sex can identify essential risk relationships for prevention, obtain effects sizes of greater magnitude and prolonged sustainability, and build robust couples-based interventions.

Developing an online health intervention for young gay and bisexual men.

Young gay and bisexual men continue to experience increases in HIV incidence in the US highlighting a need for competent health services, while the prominence of the internet in their social and sexual lives calls for novel preventive modalities. Toward this goal, we adapted an efficacious in-office HIV risk reduction intervention for online delivery. This paper describes the development of the online intervention and highlights the results of interviews and focus groups with the original intervention participants regarding effective adaptation and online delivery recommendations. The final intervention incorporates strategies for overcoming barriers to online intervention with this population and capitalizes on the unique strengths of online intervention delivery. The systematic process described in this paper can be used as a template for other researchers to develop online risk reduction programs and fills an important gap in the field's ability to maximally reach a critical risk group.

Age cohort differences in the effects of gay-related stigma, anxiety and identification with the gay community on sexual risk and substance use.

Different cohorts of gay/bisexual men experience unique developmental factors given their distinct socio-historical contexts. This study examined the moderating effects of age on three psychosocial predictors of HIV risk behavior and substance use. Analyses drew on data from a study of substance using HIV-negative and unknown status gay/bisexual men (N= 302) at risk for HIV infection. Anxiety was a strong independent predictor of sexual risk and substance use, and its effects on the sex risk outcomes were moderated by age, such that older and more anxious participants had more frequent instances of sexual risk. Identification with the gay community protected against HIV risk, and its effects on sex risk outcomes were moderated by age, such that younger participants who identified with the gay community reported less sexual risk. Understanding HIV risk within socio-historical contexts is essential in tailoring prevention by taking into account recipients' ages.

Mental Health Provider Training to Improve LGBTQ Competence and Reduce Implicit and Explicit Bias: A Randomized Controlled Trial of Online and In-Person Delivery.

Lesbian, gay, bisexual, transgender, and queer (LGBTQ) individuals in most countries face strong stigma and often rely on affirmative mental health care to foster coping and resilience. We tested an LGBTQ-affirmative mental health training for psychologists and psychiatrists by comparing in-person versus online modalities and the added benefit of supervision. Participants were randomized to a two-day training either in-person (n = 58) or via live-stream online broadcast (n = 55). Outcomes were assessed at baseline and 5, 10, and 15 months posttraining. Optional monthly online supervision was offered (n = 47) from months 5 to 15. Given the substantial need for LGBTQ-affirmative expertise in high-stigma contexts, the training took place in Romania, a Central-Eastern European country with some of the highest LGBTQ stigma in Europe. Participants (M age = 35.1) were mostly cisgender female (88%) and heterosexual (85%). Trainees, regardless of whether in-person or online, reported significant decreases from baseline to 15-month follow-up in implicit and explicit bias and significant increases in LGBTQ-affirmative clinical skills, beliefs, and behaviors. LGBTQ-affirmative practice intentions and number of LGBTQ clients did not change. Participants who attended at least one supervision session demonstrated greater reductions in explicit bias and increases in LGBTQ-affirmative behaviors from baseline to 15-month follow-up than participants who did not attend supervision. LGBTQ-affirmative mental health training can efficiently and sustainably improve LGBTQ competence and reduce provider bias in high-stigma contexts. Future research can identify additional ways to encourage mental health providers' outreach to LGBTQ clients in need of affirmative care.

A randomized controlled trial of an mHealth intervention for gay and bisexual men's mental, behavioral, and sexual health in a high-stigma, low-resource context: Project Comunica protocol.

Background: The World Health Organization (WHO) reported that 80% of new HIV diagnoses in 2014 in Europe occurred in Central and Eastern Europe (CEE). Romania has particularly high HIV incidence, AIDS prevalence, and AIDS-related deaths. HIV incidence today in Romania is largely attributed to sexual contact among gay and bisexual men (GBM). However, homophobic stigma in Romania keeps GBM out of reach of the scant available prevention services and serves as a risk factor for HIV. The Comunica intervention delivers motivational interviewing and cognitive-behavioral therapy skills across eight live text-based counseling sessions. Preliminary evidence suggests that Comunica possesses promise for reducing GBM's co-occurring mental (e.g., depression), behavioral (e.g., heavy alcohol use), and sexual (e.g., HIV-transmission-risk behavior) health risks in Romania and perhaps other similar high-stigma national contexts. This paper describes a randomized controlled trial (RCT) designed to test the efficacy of Comunica. Methods: To test Comunica's efficacy, 305 GBM were randomized to receive Comunica or a content-matched education attention control condition. The control condition consists of eight time-matched educational modules that present information regarding GBM identity development, information about HIV transmission and prevention, the importance of HIV/STI testing and treatment, heavy alcohol use and its associations with HIV-transmission-risk behavior, sexual health communication, finding social support, and creating sexual health goals. Outcomes are measured pre-intervention (baseline), and at 4-, 8-, and 12-month follow-ups. The primary outcome is frequency of condomless anal sex acts with HIV-positive or unknown-status partners outside of the context of one's own adherent PrEP use or primary partner's adherent PrEP use or undetectable viral load in the past 30 days at each follow-up. Secondary outcomes include depression, anxiety, suicidal thoughts, heavy alcohol use, and HIV/STI testing; motivational and stigma-related mechanisms of intervention efficacy will also be examined. Discussion: If found to be efficacious, Comunica presents a scalable platform to provide mental, behavioral, and sexual health support to GBM living in Romania and similar high-stigma, low-resource areas within the CEE region and beyond. Trial registration: Registered April 11, 2019 to ClinicalTrials.gov Identifier: NCT03912753.

An Internet-Based, Peer-Delivered Messaging Intervention for HIV Testing and Condom Use Among Men Who Have Sex With Men in India (CHALO!): Pilot Randomized Comparative Trial.

BACKGROUND: Leveraging internet-based communication tools (eg, messaging apps, SMS text messaging, and email) may be an effective avenue for delivery of HIV prevention messages to men who have sex with men (MSM) in India, but there are limited models for such internet-based interventions. OBJECTIVE: The CHALO! pilot was an online educational and behavioral intervention aimed to determine the feasibility, acceptability, and preliminary impact of a peer-delivered, internet-based messaging intervention for HIV testing and consistent condom use for MSM in India. The messages addressed barriers to HIV testing and condom use and were theoretically based on the information-motivation-behavioral skills model. METHODS: Between February and March 2015, we recruited, enrolled, and randomized 244 participants via online advertisements on mobile dating apps and Facebook. Eligible men (18 years or older, sexually active with other men, and self-reported HIV-negative or unknown status) were randomized to receive educational and motivational messages framed as either approach (ie, a desirable outcome to be achieved) or avoidance (an undesirable outcome to be avoided) over 12 weeks via internet-based messaging platforms. Participants completed online surveys at baseline and immediately postintervention. RESULTS: Participants were similar across arms with respect to sociodemographic and behavioral characteristics. Over 82.0% (200/244) of participants were retained (ie, viewed final messages), and 52.3% (130/244) of them completed the follow-up survey. Of those completing the follow-up survey, 82.3% (107/130) liked or strongly liked participating in CHALO!. The results showed a significant increase in self-reported HIV testing in the past 6 months from baseline to follow-up (41/130, 31.5% to 57/130, 43.8%; P=.04). When including those who reported intentions to test, this percentage increased from 44.6% (58/130) at baseline to 65.4% (85/130) at follow-up (P<.01). When examining intentions to test among those without prior HIV testing, intentions increased from 32% (16/50) of the sample at baseline to 56% (28/50) of the sample at follow-up (P=.02). Condom use during anal sex did not significantly change from baseline to follow-up. HIV testing and condom use did not significantly differ between approach and avoidance conditions at follow-up. CONCLUSIONS: As one of the first studies of an online HIV prevention intervention for Indian MSM, CHALO! was feasible to implement by a community-based organization, was acceptable to participants, and demonstrated potential to improve HIV testing rates.

A meta-analysis of the hepatitis C virus distribution in diverse racial/ethnic drug injector groups.

Hepatitis C virus (HCV) is mostly transmitted through blood-to-blood contact during injection drug use via shared contaminated syringes/needles or injection paraphernalia. This paper used meta-analytic methods to assess whether HCV prevalence and incidence varied across different racial/ethnic groups of injection drug users (IDUs) sampled internationally. The 29 prevalence and 11 incidence studies identified as part of the HCV Synthesis Project were categorized into subgroups based on similar racial/ethnic comparisons. The effect estimate used was the odds or risk ratio comparing HCV prevalence or incidence rates in racial/ethnic minority groups versus those of majority status. For prevalence studies, the clearest disparity in HCV status was observed in the Canadian and Australian Aboriginal versus White comparison, followed by the US non-White versus White categories. Overall, Hispanic IDUs had greater HCV prevalence, and HCV prevalence in African-Americans was not significantly greater than that of Whites in the US. Aboriginal groups showed higher HCV seroconversion rates when compared to others, and African-Americans had lower seroconversion rates compared to other IDUs in the US. The findings suggest that certain minority groups have elevated HCV rates in comparison to other IDUs, which may be a consequence of stigma, discrimination, different risk behaviors or decreased access to health care, services and preventive education. Future research should seek to explicitly explore and explain racial/ethnic variations in HCV prevalence and incidence, and define the groups more precisely to allow for more accurate detection of possible racial/ethnic differences in HCV rates.

Meta-regression of hepatitis C virus infection in relation to time since onset of illicit drug injection: the influence of time and place.

The authors examined the relation between time since onset of illicit drug injection (time at risk) and rates of hepatitis C virus (HCV) infection by using meta-regression. In 72 prevalence studies, median time since onset of injection was 7.24 years and median prevalence was 66.02%. The model showed statistically significant linear and quadratic effects of time at risk on HCV prevalence and significantly higher prevalence in developing and transitional countries and in earlier samples (1985-1995). In developed countries post-1995, mean fitted prevalence was 32.02% (95% confidence interval: 25.31, 39.58) at 1 year of injection and 53.01% (95% confidence interval: 40.69, 65.09) at 5 years. In developing/transitional countries post-1995, mean fitted HCV prevalence was 59.13% (95% confidence interval: 30.39, 82.74) at 1 year of injection. In 10 incidence studies, median time at risk was 5.29 years and median cumulative HCV incidence was 20.69%. Mean fitted cumulative incidence was 27.63% (95% confidence interval: 16.92, 41.70) at 1 year of drug injection. The authors concluded that time to HCV infection in developed countries has lengthened. More rapid onset of HCV infection in drug injectors in developing/transitional countries resembles an earlier era of the HCV epidemic in other regions.

The HCV Synthesis Project: scope, methodology, and preliminary results.

BACKGROUND: The hepatitis C virus (HCV) is hyper-endemic in injecting drug users. There is also excess HCV among non-injection drug users who smoke, snort, or sniff heroin, cocaine, crack, or methamphetamine. METHODS: To summarize the research literature on HCV in drug users and identify gaps in knowledge, we conducted a synthesis of the relevant research carried out between 1989 and 2006. Using rigorous search methods, we identified and extracted data from published and unpublished reports of HCV among drug users. We designed a quality assurance system to ensure accuracy and consistency in all phases of the project. We also created a set of items to assess study design quality in each of the reports we included. RESULTS: We identified 629 reports containing HCV prevalence rates, incidence rates and/or genotype distribution among injecting or non-injecting drug user populations published between January 1989 and December 2006. The majority of reports were from Western Europe (41%), North America (26%), Asia (11%) and Australia/New Zealand (10%). We also identified reports from Eastern Europe, South America, the Middle East, and the Caribbean. The number of publications reporting HCV rates in drug users increased dramatically between 1989 and 2006 to 27-52 reports per year after 1998. CONCLUSION: The data collection and quality assurance phases of the HCV Synthesis Project have been completed. Recommendations for future research on HCV in drug users have come out of our data collection phase. Future research reports can enhance their contributions to our understanding of HCV etiology by clearly defining their drug user participants with respect to type of drug and route of administration. Further, the use of standard reporting methods for risk factors would enable data to be combined across a larger set of studies; this is especially important for HCV seroconversion studies which suffer from small sample sizes and low power to examine risk factors.

Experimental Investigation of Implicit HIV and Preexposure Prophylaxis Stigma: Evidence for Ancillary Benefits of Preexposure Prophylaxis Use.

BACKGROUND: Preexposure prophylaxis (PrEP) stigma (ie, negative attitudes toward PrEP users) has been widely documented and is considered a significant barrier to implementation. However, few studies have examined PrEP stigma using implicit measures designed to reduce demand characteristics in responding. This study examined implicit PrEP- and HIV-related stigma among gay and bisexual men using geospatial social networking applications (ie, "hookup apps"). METHODS: Participants were presented with 4 simulated online profiles (pretested for comparability) paired with each of the following characteristics: HIV negative, HIV positive, on PrEP, or substance user. Participants rated the profiles on attractiveness, desirability, trustworthiness, likelihood of condom use, and riskiness of sex. RESULTS: There was no evidence of PrEP-related stigma, ie, participants did not rate profiles of PrEP users more negatively than profiles of HIV-negative individuals not disclosing PrEP use. However, profiles of HIV-positive individuals were rated significantly less attractive and desirable than HIV-negative or PrEP profiles. When the sample was split by history of PrEP use, negative ratings of HIV-positive profiles remained only among participants who had never taken PrEP. Participants with any history of PrEP use demonstrated no difference in ratings by HIV status. CONCLUSION: These data provide the first empirical evidence for lower HIV stigma among PrEP users. Individuals who have used PrEP may "see" HIV-positive individuals differently than those without a history of PrEP use. The lack of evidence for PrEP-related stigma is encouraging and suggests that negative stereotypes about PrEP users may not extend to negative implicit judgments about them on social networking sites.

Non-injection drug use and Hepatitis C Virus: a systematic review.

This systematic review examined the evidence on the prevalence of the Hepatitis C Virus (HCV) in non-injecting drug users (NIDUs) who sniff, smoke or snort drugs such as heroin, cocaine, crack or methamphetamine. The search included studies published from January 1989 to January 2006. Twenty-eight eligible studies were identified and the prevalence of HCV in these NIDU populations ranged from 2.3 to 35.3%. There was substantial variation in study focus and in the quality of the NIDU data presented in the studies. The results of our systematic review suggested that there are important gaps in the research of HCV in NIDUs. We identified a problem of study focus; much of the research did not aim to study HCV in users of non-injection drugs. Instead, NIDUs were typically included as a secondary research concern, with a principal focus on the problem of transmission of HCV in IDU populations. Despite methodological issues, HCV prevalence in this population is much higher than in a non-drug using population, even though some IDUs might have inadvertently been included in the NIDU samples. These studies point to a real problem of HCV in NIDU populations, but the causal pathway to infection remains unclear.