HIV prevalence, risk behaviors, and high-risk sexual and injection networks among young women injectors who have sex with women

Gender, sexual orientation identity, and initiation of amphetamine injecting among people who inject drugs: Examination of an expanding drug era in Montreal, Canada, 2011-19

BACKGROUND

Amphetamine injection is expanding in North America and has been associated with male homosexuality among people who inject drugs (PWID). Applying subcultural evolution theory, we examined overall and gender-stratified trends in amphetamine injection and assessed sexual orientation as a gender-specific predictor of initiation among PWID in Montreal, Canada.

METHODS

Data were from HEPCO, an open prospective cohort of PWID. Gender and sexual orientation were self-identified at enrolment. Interviewer-administered questionnaires at three-monthly (HCV RNA-negative participants) or yearly (RNA-positive) intervals captured past three-month amphetamine injection and covariates. Annual prevalence and linear trends in amphetamine injection were estimated using GEE. Incidence was computed among naïve individuals and hazard ratios for initiation estimated using gender-stratified, time-varying Cox regression models.

RESULTS

803 participants contributed 8096 observations between March 2011 and December 2019. Annual prevalence of amphetamine injecting increased from 3.25% [95%CI: 2.06-4.43%] to 12.7% [9.50-16.0] (trend p<0.001). Bivariate Cox regression models suggested similar and divergent predictors of initiation by gender. Incidence was 3.27 per 100 person-years [95%CI: 2.51-4.18] among heterosexual men, 7.18 [3.50-13.2] among gay/bisexual men, 1.93 [0.78-4.02] among heterosexual women and 5.30 [1.69-12.8] among gay/bisexual women. Among men, gay/bisexual identity doubled risk of initiation after adjusting for age, ethnicity, calendar year (aHR 2.16 [1.07-4.36]) and additional covariates (2.56 [1.24-5.30]). Among women, evidence for an association with gay/bisexual identity was inconclusive (aHR 2.63 [0.62-11.2]) and sample size precluded further adjustment CONCLUSIONS: Prevalence of amphetamine injection among PWID increased four-fold from 2011 to 2019, with elevated risk of initiation in gay and bisexual men.

A "Drug-Dependent" Immune System Can Compromise Protection against Infection: The Relationships between Psychostimulants and HIV

Psychostimulant use is a major comorbidity in people living with HIV, which was initially explained by them adopting risky behaviors that facilitate HIV transmission. However, the effects of drug use on the immune system might also influence this phenomenon. Psychostimulants act on peripheral immune cells even before they reach the central nervous system (CNS) and their effects on immunity are likely to influence HIV infection. Beyond their canonical activities, classic neurotransmitters and neuromodulators are expressed by peripheral immune cells (e.g., dopamine and enkephalins), which display immunomodulatory properties and could be influenced by psychostimulants. Immune receptors, like Toll-like receptors (TLRs) on microglia, are modulated by cocaine and amphetamine exposure. Since peripheral immunocytes also express TLRs, they may be similarly affected by psychostimulants. In this review, we will summarize how psychostimulants are currently thought to influence peripheral immunity, mainly focusing on catecholamines, enkephalins and TLR4, and shed light on how these drugs might affect HIV infection. We will try to shift from the classic CNS perspective and adopt a more holistic view, addressing the potential impact of psychostimulants on the peripheral immune system and how their systemic effects could influence HIV infection.

HIV Pre-Exposure Prophylaxis Prevention Awareness, Willingness, and Perceived Barriers among People Who Inject Drugs in Los Angeles and San Francisco, CA, 2016-2018

BACKGROUND

Pre-exposure prophylaxis (PrEP) for HIV prevention is indicated for people who inject drugs (PWID), yet most studies do not focus on PWID. This study examines factors associated with PrEP awareness and willingness, and identifies perceived barriers to PrEP among PWID. Methods: PWID were interviewed in Los Angeles and San Francisco, CA from 2016 to 2018. We analyzed data from self-reported HIV-negative participants who had injected drugs within the past 6 months (n = 469). Questions on PrEP included awareness, willingness, barriers, and uptake. Multiple logistic regression models of factors associated with awareness of, and willingness to, take PrEP were developed. Descriptive statistics on perceived PrEP barriers are reported. Results: Among HIV-negative PWID, 40% were aware of PrEP, 59% reported willingness to take PrEP, and 2% were currently taking PrEP. In multivariable analysis, PrEP awareness was associated with study site and sexual minority status, higher educational attainment, and HIV testing in the last 6 months. Willingness to take PrEP was associated with self-reported risk (paying sex partner in the last 6 months, sharing drug paraphernalia, and being injected by another PWID) and perceived HIV risk. The most common perceived barriers to PrEP were copays, concerns about increased HIV or sexually transmitted risk with PrEP, and concerns about reduction of medication efficacy without daily use. Conclusion: PrEP awareness among PWID remains inadequate. Willingness to take PrEP was moderate and was most desired by PWID who engaged in high-risk behaviors. Interventions to increase PrEP awareness and willingness, and to facilitate PrEP uptake among PWID are needed.

Latent Classes of Sexual Risk Behavior and Engagement in Outreach, Intervention and Prevention Services Among Women Who Inject Drugs Across 20 US Cities

BACKGROUND

Monitoring the effects of HIV prevention efforts among persons who inject drugs is key to informing prevention programs and policy.

METHODS

Data for this study came from the 2012 National HIV Behavioral Surveillance interviews with persons who inject drugs across 20 US cities. The present analyses include those who identified as female, ever had sex with a man, and were at risk of HIV infection (did not report a previous positive HIV test result) (n = 2624). We conducted latent class analysis to identify sexual risk classes, and modeled associations with engagement in HIV prevention services and HIV test results.

RESULTS

We identified 6 classes of sexual risk behavior: (1) low risk, (2) monogamous, (3) casual partner, (4) multiple partners, (5) exchange sex, and (6) exchange plus main partner. The class distribution was similar across the mainland regions. Bisexual orientation and homelessness were significant predictors of higher-risk class. HIV prevalence and participation in behavioral interventions did not vary significantly by risk class, while obtaining and using free condoms did. Independent of risk class, women in cities in the South were significantly less likely to use free condoms, and HIV prevalence was higher among non-Hispanic black women and women aged 40-49 years.

CONCLUSIONS

Bisexual orientation and homelessness were predictors of higher risk. Condom distribution programs reached fewer women in cities in the South. Race and age disparities in HIV-positive rates persisted after adjusting for sexual risk class.

A Psychosocial Risk Model of Potentially Traumatic Events And Sexual Risk Behavior Among LGBTQ Individuals

Lesbian, gay, bisexual, transgender, and queer (LGBTQ) individuals face heightened risk of potentially traumatic events (PTEs) exposure, including hate crimes and childhood abuse. Past research demonstrates associations between PTEs exposure and sexual risk behavior; however, examining the indirect effect of PTEs on sexual risk behavior remains understudied among LGBTQ individuals. This study tested a path analysis model to inform interventions targeted to reduce sexual risk behavior, as conceptualized by condomless sex with casual partners without knowing the person's HIV or sexually transmitted infection (STI) status, among LGBTQ individuals with PTEs exposure. Participants completed an online one-time survey and included 207 LGBTQ adults who experienced at least one PTE during the past year. Indirect effect results indicated that PTEs exposure was related to sexual risk behavior through serial associations between shame, loneliness, and substance use. Direct effect estimates indicated that greater PTEs exposure was associated with greater shame, loneliness, substance use, and sexual risk behavior. Greater shame was associated with greater loneliness, which was associated with greater substance use. Also, greater substance use was associated with greater sexual risk behavior. This study adds to the burgeoning body of literature on the relationship between PTEs exposure and sexual risk behavior among LGBTQ individuals. Clinical and counseling interventions for LGBTQ individuals with PTEs exposure should work to address modifiable psychosocial risk factors associated with sexual risk behavior.

Molecular Analysis of Human Immunodeficiency Virus Type 1 (HIV-1)-Infected Individuals in a Network-Based Intervention (Transmission Reduction Intervention Project): Phylogenetics Identify HIV-1-Infected Individuals With Social Links

Background

The Transmission Reduction Intervention Project (TRIP) is a network-based intervention that aims at decreasing human immunodeficiency virus type 1 (HIV-1) spread. We herein explore associations between transmission links as estimated by phylogenetic analyses, and social network-based ties among persons who inject drugs (PWID) recruited in TRIP.

Methods

Phylogenetic trees were inferred from HIV-1 sequences of TRIP participants. Highly supported phylogenetic clusters (transmission clusters) were those fulfilling 3 different phylogenetic confidence criteria. Social network-based ties (injecting or sexual partners, same venue engagement) were determined based on personal interviews, recruitment links, and field observation.

Results

TRIP recruited 356 individuals (90.2% PWID) including HIV-negative controls; recently HIV-infected seeds; long-term HIV-infected seeds; and their social network members. Of the 150 HIV-infected participants, 118 (78.7%) were phylogenetically analyzed. Phylogenetic analyses suggested the existence of 13 transmission clusters with 32 sequences. Seven of these clusters included 14 individuals (14/32 [43.8%]) who also had social ties with at least 1 member of their cluster. This proportion was significantly higher than what was expected by chance.

Conclusions

Molecular methods can identify HIV-infected people socially linked with another person in about half of the phylogenetic clusters. This could help public health efforts to locate individuals in networks with high transmission rates.

Sexual Orientation Differences in Health and Wellbeing Among Women Living with HIV in Canada: Findings from a National Cohort Study

Sexual orientation differences in health and wellbeing among women living with HIV (WLH) are underexplored. Limited research available, however, suggests that sexual minority WLH may experience barriers to HIV care. Cross-sectional baseline data was analyzed from a Canadian cohort study with WLH (sexual minority women [SMW]: n = 180; heterosexual women: n = 1240). SMW (median age 38 years, IQR 13) included bisexual (58.9%), lesbian (17.8%) and other sexualities (23.3%). In multivariable analyses adjusting for age, poverty, education, and ethnicity, SMW identity was associated with increased odds of: clinical (80% vs. 100% antiretroviral adherence), intrapersonal (previous/current injection drug use [IDU] vs. no IDU history, depression, lower resilience), interpersonal (childhood abuse, sex work, adulthood abuse), and structural (HIV support services barriers, unstable housing, racial discrimination, gender discrimination) factors in comparison with heterosexual identity. Sexual minority WLH experience social and health disparities relative to heterosexual WLH, highlighting the need for interventions to promote health equity.

Social mixing and correlates of injection frequency among opioid use partnerships

BACKGROUND

As resources are deployed to address the opioid overdose epidemic in the USA, it is essential that we understand the correlates of more frequent opioid injections-which has been associated not only with HIV and HCV transmission, but also with overdose risk-to inform the development and targeting of effective intervention strategies like overdose prevention and naloxone distribution programs. However, no studies have explored how characteristics of opioid use partnerships may be associated within injection frequency with opioid partnerships.

METHODS

Using baseline data from a trial of a behavioural intervention to reduce overdose among opioid users in San Francisco, CA, we calculated assortativity among opioid use partnerships by race, gender, participant-reported HIV- and HCV-status, and opioids used using Newman's assortativity coefficient (NC). Multivariable generalized estimating equations linear regression was used to examine associations between individual- and partnership-level characteristics and injection frequency within opioid use partnerships.

RESULTS

Opioid use partnerships (n=134) reported by study participants (n=55) were assortative by race (NC=0.42, 95%CI=0.33-0.50) and participant-reported HCV-status (NC=0.42, 95%CI=0.31-0.52). In multivariable analyses, there were more monthly injections among sexual/romantic partnerships (β=114.4, 95%CI=60.2-168.7, p<0.001), racially concordant partnerships reported by white study participants (β=71.4, 95%CI=0.3-142.5, p=0.049), racially discordant partnerships reported by African American study participants (β=105.7, 95%CI=1.0-210.5, p=0.048), and partnerships in which either member had witnessed the other experience an overdose (β=81.8, 95%CI=38.9-124.6, p<0.001).

CONCLUSION

Social segregation by race and HCV-status should potentially be considered in efforts to reach networks of opioid users. Due to higher injection frequency and greater likelihood of witnessing their partners experience an overdose, individuals in sexual/romantic opioid use partnerships, white individuals in racially homogenous partnerships, and African American individuals in heterogeneous partnerships may warrant focused attention as part of peer- and network-based overdose prevention efforts, as well as broader HIV/HCV prevention strategies. Developing and targeting overdose prevention education programs that provide information on risk factors and ways to identify overdose, as well as effective responses, including naloxone use and rescue breathing, for more frequently injecting networks may help reduce opioid morbidity and mortality in these most at risk groups.

Connecting the dots: network data and models in HIV epidemiology

Effective HIV prevention requires knowledge of the structure and dynamics of the social networks across which infections are transmitted. These networks most commonly comprise chains of sexual relationships, but in some populations, sharing of contaminated needles is also an important, or even the main mechanism that connects people in the network. Whereas network data have long been collected during survey interviews, new data sources have become increasingly common in recent years, because of advances in molecular biology and the use of partner notification services in HIV prevention and treatment programmes. We review current and emerging methods for collecting HIV-related network data, as well as modelling frameworks commonly used to infer network parameters and map potential HIV transmission pathways within the network. We discuss the relative strengths and weaknesses of existing methods and models, and we propose a research agenda for advancing network analysis in HIV epidemiology. We make the case for a combination approach that integrates multiple data sources into a coherent statistical framework.

Global Epidemiology of HIV Among Women and Girls Who Use or Inject Drugs: Current Knowledge and Limitations of Existing Data

BACKGROUND

Women and girls who use and inject drugs are a critical population at risk of HIV. In this article, we review data on the epidemiology of drug use and injection among women globally and HIV prevalence among women and girls who use and inject drugs.

RESULTS

Women and girls comprise one-third of people who use and inject drugs globally. There is substantial variation in HIV prevalence in this population, between and within countries. There is a pronounced lack of data examining HIV risk among particularly vulnerable subpopulations of women who use and inject drugs, including women who have sex with women, transgender women, racial and ethnic minority women, and young women. Women who use and inject drugs experience stigma and discrimination that affect access to services, and high levels of sexual risk exposures.

CONCLUSIONS

There are significant gaps in our understanding of the epidemiology of drug use and injecting among women and girls and HIV risk and prevalence in this population. Women are frequently underrepresented in studies of drug use and HIV risk and prevalence among people who inject drugs, limiting our understanding of possible sex differences in this population. Most research originates from developed countries and may not be generalizable to other settings. A great deal of work is needed to improve understanding of HIV among particularly vulnerable subpopulations, such as transgender women who use drugs. Better data are critical to efforts to advocate for the needs of women and girls who use and inject drugs.

Women Who Use or Inject Drugs: An Action Agenda for Women-Specific, Multilevel, and Combination HIV Prevention and Research

Women account for more than half of all individuals living with HIV globally. Despite increasing drug and HIV epidemics among women, women who use drugs are rarely found in research, harm reduction programs, or drug and HIV treatment and care. Women who use drugs continue to face challenges that increase their vulnerability to HIV and other comorbidities because of high rates of gender-based violence, human rights violations, incarceration, and institutional and societal stigmatization. This special issue emphasizes how the burdens of HIV, drug use, and their co-occurring epidemics affect women in a global context. Articles included focus on the epidemiologies of HIV and hepatitis C virus and other comorbidities; HIV treatment, prevention, and care; and policies affecting the lives of women who use drugs. This issue also highlights the state of the science of biomedical and behavioral research related to women who use drugs. The final article highlights the major findings of articles covered and presents a call to action regarding needed research, treatment, and preventive services for women who use drugs. To address these needs, we advocate for women-specific thinking and approaches that consider the social, micro, and macro contexts of women's lives. We present a women-specific risk environment framework that reflects the unique lives and contexts of women who use drugs and provides a call to action for intervention, prevention, and policies.

HIV Risk, Health, and Social Characteristics of Sexual Minority Female Injection Drug Users in Baltimore

Female injection drug users (IDU) who report sex with women are at increased risk for HIV and social instability, but it is important to assess whether these disparities also exist according to sexual minority identity rather than behaviorally defined categories. Within a sample of current IDU in Baltimore, about 17 % of female study participants (n = 307) identified as gay/lesbian/bisexual. In controlled models, sexual minorities were three times as likely to report sex exchange behavior and four times as likely to report a recent STI. Injection risk did not differ significantly, but sexual minority women reported higher prevalence of socio-economic instability, negative health indicators, and fewer network financial, material, and health support resources. There is a need to identify and address socio-economic marginalization, social support, and health issues among female IDUs who identify as lesbian or bisexual.

Women Who Have Sex with Women Living in Low- and Middle-Income Countries: A Systematic Review of Sexual Health and Risk Behaviors

Women who have sex with women (WSW) have long been considered at low risk of acquiring and transmitting HIV and other sexually transmitted infections (STIs). However, limited research has been conducted on WSW, especially those living in low-and middle-income countries (LMICs). We reviewed available research on sexual health and risk behaviors of WSW in LMICs. We searched CINAHL, Embase, and PubMed for studies of WSW in LMICs published between January 1, 1980, and December 31, 2013. Studies of any design and subject area that had at least two WSW participants were included. Data extraction was performed to report quantifiable WSW-specific results related to sexual health and risk behaviors, and key findings of all other studies on WSW in LMICs. Of 652 identified studies, 56 studies from 22 countries met inclusion criteria. Reported HIV prevalence among WSW ranged from 0% in East Asia and Pacific and 0%-2.9% in Latin America and the Caribbean to 7.7%-9.6% in Sub-Saharan Africa. Other regions did not report WSW HIV prevalence. Overall, many WSW reported risky sexual behaviors, including sex with men, men who have sex with men (MSM), and HIV-infected partners; transactional sex; and substance abuse. WSW are at risk for contracting HIV and STIs. While the number of research studies on WSW in LMICs continues to increase, data to address WSW sexual health needs remain limited.

Self-identified heterosexual clients in substance abuse treatment with a history of same-gender sexual contact

There is virtually no literature concerning the experiences of self-identified heterosexual clients in substance abuse treatment who have a history of same-gender sexual contact (HSGS). In a U.S. urban inpatient program in 2009-2010, 99 HSGS clients were compared to 681 other heterosexual and 86 lesbian, gay, and bisexual clients regarding background factors, program completion rates, and feelings about treatment. Male HSGS participants had lower completion rates than other male heterosexual participants. Qualitative data indicated that most male HSGS participants experienced difficult emotions regarding same-gender sexual encounters, particularly those involving trading sex for money or drugs. Implications for treatment are discussed.

Forced sexual experiences as risk factor for self-reported HIV infection among southern African lesbian and bisexual women

Even though women who have sex with women are usually understood to be at no or very low risk for HIV infection, we explored whether lesbian and bisexual women in a geographical area with high HIV prevalence (Southern Africa) get tested for HIV and whether, among those women who get tested, there are women who live with HIV/AIDS. The study was conducted in collaboration with community-based organizations in Botswana, Namibia, South Africa and Zimbabwe. Data were collected via written surveys of women who in the preceding year had had sex with a woman (18 years and older; N = 591). Most participating women identified as lesbian and black. Almost half of the women (47.2%) reported ever having had consensual heterosexual sex. Engagement in transactional sex (lifetime) was reported by 18.6% of all women. Forced sex by men or women was reported by 31.1% of all women. A large proportion of the women reported to ever have been tested for HIV (78.3%); number of lifetime female and male partners was independently associated with having been tested; women who had engaged in transactional sex with women only or with women and men were less likely to have been tested. Self-reported HIV prevalence among tested women who knew their serostatus was 9.6%. Besides age, the sole independent predictor of a positive serostatus was having experienced forced sex by men, by women, or by both men and women. Study findings indicate that despite the image of invulnerability, HIV/AIDS is a reality for lesbian and bisexual women in Southern Africa. Surprisingly, it is not sex with men per se, but rather forced sex that is the important risk factor for self-reported HIV infection among the participating women. HIV/AIDS policy should also address the needs of lesbian, bisexual and other women who have sex with women.

HIV risk, substance use, and suicidal behaviors among Asian American lesbian and bisexual women

The authors examined the association between lesbian/bisexual identity and three risky health behaviors (HIV risk, substance use, and suicidal behaviors) in a sample of Asian American women. This cross-sectional study was designed to investigate the prevalence of HIV risk behaviors and mental health functioning among unmarried Chinese, Korean, and Vietnamese women ages 18 to 35 who are children of immigrants (N = 701), using computer-assisted survey interviews (CASI). Approximately one out of five Asian American women in the sample identified themselves as a lesbian and bisexual woman (18%). Overall, Asian American lesbian and bisexual women reported higher proportions of risky health behaviors than did their exclusively heterosexual counterparts. The odds of engaging in HIV risk behaviors, using substances, and experiencing suicidal ideation were two to three times higher for lesbian and bisexual women than for exclusively heterosexual women. These findings suggest that rigorous screening is necessary for identifying women in this lesbian/bisexual subgroup in order to provide them with better assessment and services.

"We don't exist": a qualitative study of marginalization experienced by HIV-positive lesbian, bisexual, queer and transgender women in Toronto, Canada

BACKGROUND

Lesbian, bisexual, queer and transgender (LBQT) women living with HIV have been described as invisible and understudied. Yet, social and structural contexts of violence and discrimination exacerbate the risk of HIV infection among LBQT women. The study objective was to explore challenges in daily life and experiences of accessing HIV services among HIV-positive LBQT women in Toronto, Canada.

METHODS

We used a community-based qualitative approach guided by an intersectional theoretical framework. We conducted two focus groups; one focus group was conducted with HIV-positive lesbian, bisexual and queer women (n = 7) and the second with HIV-positive transgender women (n = 16). Participants were recruited using purposive sampling. Focus groups were digitally recorded and transcribed verbatim. Thematic analysis was used for analyzing data to enhance understanding of factors that influence the wellbeing of HIV-positive LBQT women.

RESULTS

Participant narratives revealed a trajectory of marginalization. Structural factors such as social exclusion and violence elevated the risk for HIV infection; this risk was exacerbated by inadequate HIV prevention information. Participants described multiple barriers to HIV care and support, including pervasive HIV-related stigma, heteronormative assumptions in HIV-positive women's services and discriminatory and incompetent treatment by health professionals. Underrepresentation of LBQT women in HIV research further contributed to marginalization and exclusion. Participants expressed a willingness to participate in HIV research that would be translated into action.

CONCLUSIONS

Structural factors elevate HIV risk among LBQT women, limit access to HIV prevention and present barriers to HIV care and support. This study's conceptualization of a trajectory of marginalization enriches the discussion of structural factors implicated in the wellbeing of LBQT women and highlights the necessity of addressing LBQT women's needs in HIV prevention, care and research. Interventions that address intersecting forms of marginalization (e.g. sexual stigma, transphobia, HIV-related stigma) in community and social norms, HIV programming and research are required to promote health equity among LBQT women.

Spatial access to sterile syringes and the odds of injecting with an unsterile syringe among injectors: a longitudinal multilevel study

Despite the 2010 repeal of the ban on spending federal monies to fund syringe exchange programs (SEPs) in the U.S.A., these interventions--and specifically SEP site locations--remain controversial. To further inform discussions about the location of SEP sites, this longitudinal multilevel study investigates the relationship between spatial access to sterile syringes distributed by SEPs in New York City (NYC) United Hospital Fund (UHF) districts and injecting with an unsterile syringe among injectors over time (1995-2006). Annual measures of spatial access to syringes in each UHF district (N = 42) were created using data on SEP site locations and site-specific syringe distribution data. Individual-level data on unsterile injecting among injectors (N = 4,067) living in these districts, and on individual-level covariates, were drawn from the Risk Factors study, an ongoing cross-sectional study of NYC drug users. We used multilevel models to explore the relationship of district-level access to syringes to the odds of injecting with an unsterile syringe in >75% of injection events in the past 6 months, and to test whether this relationship varied by district-level arrest rates (per 1,000 residents) for drug and drug paraphernalia possession. The relationship between district-level access to syringes and the odds of injecting with an unsterile syringe depended on district-level arrest rates. In districts with low baseline arrest rates, better syringe access was associated with a decline in the odds of frequently injecting with an unsterile syringe (AOR, 0.95). In districts with no baseline syringe access, higher arrest rates were associated with increased odds of frequently injecting with an unsterile syringe (AOR, 1.02) When both interventions were present, arrest rates eroded the protective effects of spatial access to syringes. Spatial access to syringes in small geographic areas appears to reduce the odds of injecting with an unsterile syringe among local injectors, and arrest rates elevate these odds. Policies and practices that curtail syringe flow in geographic areas (e.g., restrictions on SEP locations or syringe distribution) or that make it difficult for injectors to use the sterile syringes they have acquired may damage local injectors' efforts to reduce HIV transmission and other injection-related harms.

HIV risk behaviors among young drug using women who have sex with women (WSWs) in New York City

Previous research has suggested that multiple stressors may work in tandem to affect the health of women who have sex with women (WSWs). WSWs have been a part of the HIV epidemic in New York City since the beginning, making it an ideal setting to further explore these women's risk. Among a sample of 375 heroin, crack and/or cocaine using women recruited from economically disadvantaged communities in New York City, we examined HIV seroprevalence and risk behaviors among WSWs as compared to women who have sex with men only (WSMOs). We also explore differences between WSWs and WSMOs with respect to potential stressors (i.e., decreased access to resources and health care utilization and violence victimization) that might contribute overall HIV risk. The study's limitations are noted.

Spatial access to syringe exchange programs and pharmacies selling over-the-counter syringes as predictors of drug injectors' use of sterile syringes

OBJECTIVES

We examined relationships of spatial access to syringe exchange programs (SEPs) and pharmacies selling over-the-counter (OTC) syringes with New York City drug injectors' harm reduction practices.

METHODS

Each year from 1995 to 2006, we measured the percentage of 42 city health districts' surface area that was within 1 mile of an SEP or OTC pharmacy. We applied hierarchical generalized linear models to investigate relationships between these exposures and the odds that injectors (n = 4003) used a sterile syringe for at least 75% of injections in the past 6 months.

RESULTS

A 1-unit increase in the natural log of the percentage of a district's surface area within a mile of an SEP in 1995 was associated with a 26% increase in the odds of injecting with a sterile syringe; a 1-unit increase in this exposure over time increased these odds 23%. A 1-unit increase in the natural log of OTC pharmacy access improved these odds 15%.

CONCLUSIONS

Greater spatial access to SEPs and OTC pharmacies improved injectors' capacity to engage in harm reduction practices that reduce HIV and HCV transmission.

Relationship characteristics associated with anal sex among female drug users

BACKGROUND

Anal sex is an important yet little studied HIV risk behavior for women.

METHODS

Using information collected on recent sexual encounters, we examined the influence of sex partner and relationship characteristics on the likelihood of engaging in anal sex among women with a high risk of HIV infection.

RESULTS

Anal sex was nearly 3 times more common among actively bisexual women (OR = 2.96, 95% CI: 2.17-4.03). Women were more likely to have anal sex with partners who injected drugs (OR = 2.32, 95% CI: 1.44-3.75), were not heterosexual (OR = 1.85, 95% CI: 1.18-2.90), and with whom they exchanged money or drugs for sex (OR = 1.79, 95% CI: 1.10-2.90). The likelihood of anal sex also increased with the number of nights sleeping together (OR = 1.15, 95% CI: 1.06-1.24). In contrast, emotional closeness and social closeness were not associated with anal sex. Condom use during anal sex was uncommon, and did not vary according to partner or relationship characteristics.

CONCLUSIONS

Our findings support the need for HIV prevention interventions that target anal sex among heterosexuals, particularly in drug-using populations residing in neighborhoods with elevated levels of HIV prevalence.

Social and behavioral correlates of sexually transmitted infection- and HIV-discordant sexual partnerships in Bushwick, Brooklyn, New York

INTRODUCTION

The Centers for Disease Control and Prevention (CDC) advise repeat HIV testing for partners of HIV-infected persons; injection drug users and their sex partners; individuals with recent multiple partnerships and their sex partners; those involved in sex trade; and men who have sex with men. Additional social and behavioral variables may be useful for identifying priority populations.

METHODS

We analyzed data collected during a social network study conducted in a Brooklyn, NY, neighborhood to identify social and behavioral characteristics of respondents (N = 343) involved in HIV-discordant, herpes simplex virus-2- discordant, and chlamydia-discordant partnerships.

RESULTS

HIV partnership discordance was associated with injection drug use but was generally not associated with sexual behaviors including multiple partnerships and sex trade. herpes simplex virus-2 and chlamydia partnership discordance were associated with multiple partnerships, sex trade, and same sex partnership history. Additional correlates of sexually transmitted infection (STI)/HIV-discordant partnerships included older age (>or=25 years), noninjection drug use, and incarceration history. Analyses suggested that screening tools composed of CDC-recommended sexual risk and injection drug indicators plus indicators of older age, noninjection drug use, and incarceration were more effective in identifying STI/HIV priority populations than tools composed of CDC indicators alone.

CONCLUSIONS

Screening tools that include social and behavioral indicators may improve STI/HIV case-finding effectiveness.

Present but not accounted for: exploring the sexual risk practices and intervention needs of nonheterosexually identified women in a prevention program for women with HIV/AIDS

Nonheterosexually identified (NHI) women may be present, but not accounted for, in HIV and sexually transmitted infection (STI) prevention interventions. This study used quantitative and qualitative methods to examine the sexual risk behaviors and intervention needs of NHI women in Protect and Respect, a safer sex intervention for HIV-positive women. Study participants (n=32) were predominantly Black, low income, and between 28 and 51 years old. Although NHI participants were more likely than heterosexual participants (p < .05) to report obtaining their income from sex work, hustling, or selling drugs; and having a higher median number of male sex partners, qualitative analyses revealed that the intervention often neglected NHI women's experiences and unique safer sex needs. Heterosexist HIV and STI prevention programs may hinder NHI women's ability to protect themselves and their partners from reinfection and infection respectively. We discuss the implications of our research for future HIV/AIDS and STI research, services and interventions for NHI women.

Dimensions of sexual orientation and HIV-related risk among adolescent females: evidence from a statewide survey

OBJECTIVES

We examined the relationship of 2 dimensions of sexual orientation--sexual identity and sex of partners--with self-reported behaviors and experiences to identify factors that may place adolescent females at risk of HIV/AIDS.

METHODS

We gathered data on sexually experienced female high school students from 4 waves of a population-based survey. We used logistic regression analyses to investigate the association between their sexual identity (3666 heterosexual; 184 lesbian, gay, or bisexual; 113 not sure) and sex of partners (3714 male only, 79 female only, and 180 both males and females) with HIV-related risk behaviors.

RESULTS

Self-defined sexual identity was often inconsistent with sex of sexual partners. Sexual identities other than heterosexual and having same-sex partners (either exclusively or in addition to male partners) were associated with high rates of several HIV-related risk behaviors. Coerced sexual contact was significantly associated with every risk outcome. AIDS education in school predicted lower HIV risk on 4 of 6 indicators.

CONCLUSIONS

Programs to prevent HIV infection among adolescent females should take into account the complexity of sexual orientation and should address the needs and behaviors of sexual-minority youths.

Prevalence and predictors of injecting-related injury and disease among clients of Australia's needle and syringe programs

OBJECTIVE

To identify lifetime prevalence and predictors of self-reported injecting-related injuries and diseases (IRID) and/or injecting-related problems (IRP) among a national cross-sectional sample of injecting drug users.

METHODS

1,961 clients of 45 needle and syringe programs (NSPs) who participated in the 2006 Australian NSP Survey self-completed an item regarding lifetime experience of eight separate IRIDs and IRPs.

RESULTS

Sixty-nine per cent of participants reported a history of IRID/IRP, with a mean of 1.9 injuries/problems (range 0-8). Lifetime prevalence of specific injuries/problems ranged from problems finding a vein (43%) to endocarditis (4%). Factors independently associated with IRID/IRP included bisexual identity; daily or more frequent injecting; injection of pharmaceutical preparations; female gender; longer injecting history; and hepatitis C antibody-positive serostatus.

CONCLUSIONS

Consistent with existing literature, results suggest that vascular injury and localised infections are common among IDUs; and that treatment-seeking is often delayed until serious complications arise.

IMPLICATIONS

Findings support the imperative for co-ordinated and timely treatment and prevention activities to reduce the severity and burden of these prevalent injecting outcomes.

The importance of social networks in their association to drug equipment sharing among injection drug users: a review

AIM

To examine the scientific evidence regarding the association between characteristics of social networks of injection drug users (IDUs) and the sharing of drug injection equipment.

METHODS

A search was performed on MEDLINE, EMBASE, BIOSIS, Current Contents, PsycINFO databases and other sources to identify published studies on social networks of IDUs. Papers were selected based on their examination of social network factors in relation to the sharing of syringes and drug preparation equipment (e.g. containers, filters, water). Additional relevant papers were found from the reference list of identified articles.

RESULTS

Network correlates of drug equipment sharing are multi-factorial and include structural factors (network size, density, position, turnover), compositional factors (network member characteristics, role and quality of relationships with members) and behavioural factors (injecting norms, patterns of drug use, severity of drug addiction). Factors appear to be related differentially to equipment sharing.

CONCLUSIONS

Social network characteristics are associated with drug injection risk behaviours and should be considered alongside personal risk behaviours in prevention programmes. Recommendations for future research into the social networks of IDUs are proposed.

Some data-driven reflections on priorities in AIDS network research

Risk networks can transmit HIV or other infections; social networks can transmit social influence and thus help shape norms and behaviors. This primarily-theoretical paper starts with a review of network concepts, and then presents data from a New York network study to study patterns of sexual and injection linkages among IDUs and other drug users and nonusers, men who have sex with men, women who have sex with women, other men and other women in a high-risk community and the distribution of HIV, sex at group sex events, and health intravention behaviors in this network. It then discusses how risk network microstructures might influence HIV epidemics and urban vulnerability to epidemics; what social and other forces (such as "Big Events" like wars or ecological disasters) might shape networks and their associated norms, intraventions, practices and behaviors; and how network theory and research have and may continue to contribute to developing interventions against HIV epidemics.

Injecting and sexual risk correlates of HBV and HCV seroprevalence among new drug injectors

We examine injecting and sexual risk correlates of hepatitis B (HBV) and hepatitis C (HCV) seroprevalence among new injecting drug users (IDUs) (age 18-30 years, injecting < or =6 years). Participants were interviewed/serotested (HIVab, HBVcAb, HCVab) in New York City, February 1999-February 2003. Gender-stratified, multivariate logistic regression was conducted. Participants (N=259) were: 68% male; 81% white. Women were more likely to test HCV seropositive (42% versus 27%) and men HBV seropositive (24% versus 12%); HIV seroprevalence was low (3%). Among both men and women, HBV seropositivity was associated with ever selling sex, and HCV seropositivity with ever having had infected (HIV, HBV or HCV) sex partners (among those ever sharing injecting equipment). Among women only, HBV seropositivity was associated with ever having had infected sex partners (regardless of ever sharing injecting equipment), and HCV seropositivity with > or =300 lifetime drug injections. Among men only, HCV seropositivity was associated with > or =40 lifetime number of sex partners (among those never sharing injecting equipment). In this new IDU sample, HBV and HCV seroprevalence differed by gender and were considerably higher than HIV seroprevalence. Early interventions, targeting injecting and sexual risks and including HBV vaccination, are needed among new IDUs to prevent HBV, HCV and, potentially, HIV epidemics.

Respondent-driven sampling of injection drug users in two U.S.-Mexico border cities: recruitment dynamics and impact on estimates of HIV and syphilis prevalence

Respondent-driven sampling (RDS), a chain referral sampling approach, is increasingly used to recruit participants from hard-to-reach populations, such as injection drug users (IDUs). Using RDS, we recruited IDUs in Tijuana and Ciudad (Cd.) Juárez, two Mexican cities bordering San Diego, CA and El Paso, TX, respectively, and compared recruitment dynamics, reported network size, and estimates of HIV and syphilis prevalence. Between February and April 2005, we used RDS to recruit IDUs in Tijuana (15 seeds, 207 recruits) and Cd. Juárez (9 seeds, 197 recruits), Mexico for a cross-sectional study of behavioral and contextual factors associated with HIV, HCV and syphilis infections. All subjects provided informed consent, an anonymous interview, and a venous blood sample for serologic testing of HIV, HCV, HBV (Cd. Juárez only) and syphilis antibody. Log-linear models were used to analyze the association between the state of the recruiter and that of the recruitee in the referral chains, and population estimates of the presence of syphilis antibody were obtained, correcting for biased sampling using RDS-based estimators. Sampling of the targeted 200 recruits per city was achieved rapidly (2 months in Tijuana, 2 weeks in Cd. Juárez). After excluding seeds and missing data, the sample prevalence of HCV, HIV and syphilis were 96.6, 1.9 and 13.5% respectively in Tijuana, and 95.3, 4.1, and 2.7% respectively in Cd. Juárez (where HBV prevalence was 84.7%). Syphilis cases were clustered in recruitment trees. RDS-corrected estimates of syphilis antibody prevalence ranged from 12.8 to 26.8% in Tijuana and from 2.9 to 15.6% in Ciudad Juárez, depending on how recruitment patterns were modeled, and assumptions about how network size affected an individual's probability of being included in the sample. RDS was an effective method to rapidly recruit IDUs in these cities. Although the frequency of HIV was low, syphilis prevalence was high, particularly in Tijuana. RDS-corrected estimates of syphilis prevalence were sensitive to model assumptions, suggesting that further validation of RDS is necessary.

Sexual and drug risk behaviors among women who have sex with women

OBJECTIVES

We examined risk behaviors of female drug users, comparing those who reported recently having had sex with women (recent WSW), those who reported previously having had sex with women (former WSW), and those who reported never having had sex with women (never WSW).

METHODS

We used data from the Risk Evaluation and Assessment of Community Health III Study. Adjusted odds for predictors of WSW status were determined via multinomial logistic regression analyses.

RESULTS

Of the participants, 75% were never WSW, 12% were former WSW, and 13% were recent WSW. In comparison with never WSW status, significant predictors of recent WSW status were living away from one's parents as a child (adjusted odds ratio [OR]=3.05; 95% confidence interval [CI]=1.07, 8.67) and recently having been paid for sex by men (adjusted OR=4.02; 95% CI=1.67, 9.68). Also, recently having been paid for sex by men was a significant predictor of former WSW status as opposed to never WSW status (adjusted OR=3.97; 95% CI=1.65, 9.59).

CONCLUSIONS

The recency with which they had sex with women is one of the facets influencing the risk profile of WSW. The diverse characteristics of the WSW population need to be incorporated into future studies and risk interventions targeting this group.

Update and overview of practical epidemiologic aspects of HIV/AIDS among injection drug users in the United States

In a changing public health landscape in which local, state, and federal agencies must confront threats of bioterrorism, emerging infections, and numerous chronic diseases, transmission of HIV among injection drug users (IDUs) continues to be an important public health issue and one of the driving forces behind the HIV epidemic. Using a computerized MEDLINE search of published articles from January 1981 through October 2005, we conducted a literature review of practical epidemiologic aspects of HIV/AIDS among IDUs in the United States. Although recent trends indicate a decline in the proportion of newly diagnosed HIV infections associated with injection drug use, drug-use behaviors overall still account for 32% of new HIV diagnoses. Factors in addition to syringe sharing contribute to HIV transmission among IDUs: risky sexual behaviors, sharing of drug preparation equipment and drug solutions, and contextual and social factors. Promising approaches for HIV prevention include rapid HIV testing, office-based substance abuse treatment, behavioral interventions, improved communication about syringe exchange programs, and case management. HIV among IDUs continues to be an important public health problem in the 21st century. It is imperative that public health agencies continue to monitor and combat the HIV epidemic among IDUs to ensure that hard-won gains will not be eroded.

Behavior change and health-related interventions for heterosexual risk reduction among drug users

Prevention of heterosexual transmission of HIV between and from drug users is important for controlling the local and global HIV heterosexual epidemic. Sex risk reduction interventions and health-related interventions are important for reducing the sex risk behaviors of drug users. Sex risk reduction interventions address individual-level, peer-level, and structural-level determinants of risk reduction. Health-related interventions include HIV counseling and testing, prevention and treatment of sexually transmitted diseases, and delivery of highly active antiretroviral therapy. It is important to adapt effective interventions implemented in resource-rich countries to the realities of the resource-constrained settings and to address relevant contextual factors.

HIV prevalence and correlates of receptive needle sharing among injection drug users in the Mexican-U.s. border city of Tijuana

Injection drug use is a growing but understudied problem in Tijuana, a city situated on the northwestern Mexico-U.S border. The authors studied factors associated with receptive needle sharing in an effort to inform prevention activities. In 2003, street-recruited injection drug users (IDUs) in Tijuana underwent interviews on injection risk behaviors and rapid HIV antibody tests. Logistic regression was used to identify correlates of receptive needle sharing at the last injection episode. Of 402 IDUs, 87.6% were male; the median age was 34. HIV prevalence was 4.01% (95% CI: 2.29-6.51). One third reported receptive needle sharing at last injection. Factors independently associated with receptive needle sharing were years living in Tijuana (Adjusted Odds Ratio [AdjOR]= 0.97 per year, 95% CI: 0.96-0.99), being bisexual/homosexual (AdjOR=2.12; 95% CI: 1.30 - 3.44), unemployed (AdjOR=2.5; 95% CI: 1.52-4.10), never having an HIV test (AOR: 4.02; 95% CI: 2.44-6.60), having friends who placed importance on avoiding HIV (AdjOR: 0.36; 95% CI: 0.19-0.68) and last injecting in a shooting gallery (AdjOR=1.98; 95% CI: 1.21-3.24). These results underscore the need to increase access to voluntary HIV testing and counseling to IDUs and migrants in Tijuana, as well as expand access to sterile syringes in an effort to avert widespread HIV transmission.

HIV risk behavior among amphetamine injectors at U.S. syringe exchange programs

The goal of this study was to compare HIV risk behaviors of amphetamine and non-amphetamine injectors at syringe exchange programs (SEP) in the United States and to identify factors associated with injection risk. This analysis is based on data from a random cross-section of participants at 13 SEPs in different parts of the country. All interviews were done using Audio Computer-Assisted Personal Interviewing technology. Amphetamine injectors differ from other SEP participants in that they are younger and more likely to be White, to have had a recent same sex partner, and to be homeless. Rates of injection risk behavior are higher among amphetamine injectors than other SEP participants, but rates of condom use are similar. Factors associated with injection risk behavior are amphetamine injection, homelessness, depression, and having a recent same-gender sexual partner (for both men and women). SEPs have been repeatedly demonstrated to reduce injection risk behavior, but some groups of program participants continue to be at elevated risk. SEPs may need to develop new approaches to outreach and education to address the needs of amphetamine injectors and other populations at persistent risk.

Who is epidemiologically fathomable in the HIV/AIDS epidemic? Gender, sexuality, and intersectionality in public health

This paper examines the shifting nature of contemporary epidemiological classifications in the HIV/AIDS epidemic. It first looks at assumptions that guide a discourse of vulnerability and circulate around risk categories. It then examines the underlying emphasis in public health on the popular frame of "vulnerable women" who acquire HIV through heterosexual transmission. Drawing on work on gender, sexuality, and intersectionality, the paper asks why a discourse of vulnerability is infused into discussions of heterosexually-active women's HIV risks but not those pertaining to heterosexually-active men's. The paper then moves to current surveillance categories that are hierarchically and differentially applied to women's and men's risks in the HIV epidemic. Here, the focus is on the way in which contemporary classifications allow for the emergence of the vulnerable heterosexually-active woman while simultaneously constituting lack of fathomability concerning bisexual and lesbian transmission risk. Lastly, theories of intersectionality, are used to examine current research on woman-to-woman transmission, and to suggest future more productive options.

HIV incidence among high-risk Puerto Rican drug users: a comparison of East Harlem, New York, and Bayamón, Puerto Rico

Significant differences in HIV-related risk behaviors have been found between Puerto Rican drug users in New York City (NY) and Puerto Rico (PR). An examination of HIV incidence rates and characteristics of seroconverters in each location was undertaken. Baseline and follow-up interviewing and HIV testing were conducted in 1998 to 2002 with seronegative Puerto Rican injection drug users (IDUs) and crack smokers from East Harlem, NY (n = 455) and Bayamón, PR (n = 268). There were a total of 32 seroconverters, 9 in NY and 23 in PR, for seroconversion rates of 0.88/100 person-years at risk (pyr; 95% CI, 0.31-1.45) in NY and 3.37/100 pyr (95% CI, 2.02-4.72) in PR (P < 0.001). In PR, variables significantly related to seroconversion were younger age and using shooting galleries. Being in methadone treatment was protective against seroconversion. In NY, crack use was significantly related to seroconversion. The higher seroconversion rate found in PR indicates a need to enhance HIV prevention efforts, including increasing methadone treatment and access to sterile syringes. The need to address sexual risk behaviors in both locations was also indicated. Resources focusing on reducing HIV transmission in the Caribbean should include efforts to target the drug use-HIV epidemic in PR.

Requiring Help Injecting Independently Predicts Incident HIV Infection Among Injection Drug Users

BACKGROUND

Requiring help injecting has been associated with syringe sharing among injection drug users (IDUs). No prospective study has fully examined this risk factor and its relation to rates of HIV infection. We investigated whether requiring help injecting illicit drugs was a predictor of HIV infection among a prospective cohort of IDUs.

METHODS

The Vancouver Injection Drug User Study is a prospective study of more than 1500 IDUs who have been recruited from the Downtown Eastside of Vancouver since May 1996. At baseline and semiannually, subjects provided blood samples and completed an interviewer-administered questionnaire. The questionnaire elicits demographic data as well as information about drug use, HIV risk behavior, and drug treatment. HIV incidence rates were calculated using Kaplan-Meier methods, and Cox regression determined independent predictors of seroconversion.

RESULTS

A total of 1013 baseline HIV-negative participants were eligible for this study. Within this population, 418 (41.3%) participants had required help injecting during the last 6 months at baseline. Participants requiring help injecting were more likely to be female (odds ratio = 2.3, 95% confidence interval [CI]: 1.8-3.0; P < 0.001), were slightly younger (33.5 vs. 34.9 years of age; P = 0.014), and had fewer years of experience injecting drugs (7 vs. 11 years; P < or = 0.001). Among participants who required help injecting at baseline, cumulative HIV incidence at 36 months was 16.1% compared with 8.8% among participants who did not require help injecting (log-rank, P < 0.001). In an adjusted model controlling for potential confounding variables, being aboriginal (relative hazard [RH] = 1.68, 95% CI: 1.15-2.48), injecting cocaine daily (RH = 2.71, 95% CI: 1.87-3.95), and requiring help injecting (RH = 1.79, 95% CI: 1.23-2.62) remained independent predictors of HIV seroconversion.

CONCLUSIONS

These data demonstrate the need for interventions to reduce the risk of HIV infection among IDUs who require help injecting.

The trouble with "MSM" and "WSW": erasure of the sexual-minority person in public health discourse

Men who have sex with men (MSM) and women who have sex with women (WSW) are purportedly neutral terms commonly used in public health discourse. However, they are problematic because they obscure social dimensions of sexuality; undermine the self-labeling of lesbian, gay, and bisexual people; and do not sufficiently describe variations in sexual behavior.MSM and WSW often imply a lack of lesbian or gay identity and an absence of community, networks, and relationships in which same-gender pairings mean more than merely sexual behavior. Overuse of the terms MSM and WSW adds to a history of scientific labeling of sexual minorities that reflects, and inadvertently advances, heterosexist notions. Public health professionals should adopt more nuanced and culturally relevant language in discussing members of sexual-minority groups.

Exploring an HIV paradox: an ethnography of sexual minority women injectors

HIV risk and infection are markedly increased among sexual minority women injectors compared to other injecting drug users. Our ethnographic exploration of this well-documented but poorly understood phenomenon included 270 interviews and over 350 field observations with 65 sexual minority women injectors in New York City and Boston. We discuss findings in relation to four preliminary hypotheses. Neither the presence of gay or bisexual men in risk networks, nor a sense of invulnerability due to lesbian (or other sexual minority) identity seem to be plausible explanations of increased HIV among sexual minority women injectors. However, multiple marginalization was found to be pervasive and to have severe consequences that can be traced to increased HIV risk for many women in the study.

Risks and prevention of sexually transmissible infections among women who have sex with women

Health care providers working with women who have sex with women (WSW) have been ill-informed about a range of sexual health issues for these women. Pertinent issues include sexual behaviours that carry risks of sexually transmissible infection (STI), prevention strategies for safer sex and understanding experiences of abuse. A relative silence continues in all of these areas within the mainstream medical literature, textbooks, research and policy documents, which perpetuates medical ignorance. There is evidence that the prevalence of STIs among WSW is at least as high as among heterosexual women, if not higher among some sub-groups. Risk factors include the sex and number of sexual partners, minimal use of protected sexual behaviours and low levels of knowledge of STI prevention among WSW. Importantly, marginalisation leading to poorer mental health and experiences of abuse can combine to influence risk taking including substance abuse and risky sexual behaviours. Safe-sex guidelines and the need to recognise the impact of sexual abuse are presented.

[Non heterosexual patients in gynaecology]

Visible or invisible? Despite a growing tolerance of homosexuality over the past 30 years, little research on lesbian health or lesbian healthcare behaviour has been conducted in France. We have reviewed American studies in an attempt to investigate the relationship between sexual orientation and general and gynaecological health. In this paper, we stress the importance of trust in the doctor-patient relationship.

Hepatitis B virus infection and vaccination among young injection and non-injection drug users: missed opportunities to prevent infection

INTRODUCTION

We examined correlates of HBV infection and vaccination and the missed vaccination opportunities among young injection drug users (IDUs) and non-injection drug users (NIDUs).

METHODS

Two hundred IDUs and 124 NIDUs aged 15-30 years were studied. Demographics, drug use and sexual behaviors, and health and incarceration history data were collected. Serology was conducted for antibodies to HBV-core antigen (anti-HBc) and HBV-surface antigen (anti-HBs). Presence of anti-HBc indicated past HBV infection; presence of anti-HBs alone indicated past vaccination.

RESULTS

More IDUs had been infected with HBV in the past than NIDUs (37% versus 19%, P = 0.001). Among male and female IDUs, injection drug use behaviors were significantly associated with past infection. For female IDUs, being African-American and trading sex were also associated with previous infection. Among NIDUs, being female and longer time since sexual debut were associated with past infection. Overall, 11% were vaccinated (10% IDU versus 14% NIDU, P = 0.30). Younger age and drug treatment history were associated with vaccination. Most susceptibles (84%) experienced at least one missed opportunity for vaccination.

CONCLUSION

Young drug users remain at high risk for HBV infection. Vaccination rates remain low despite multiple opportunities for vaccination. An integrated HBV immunization effort should be coordinated among venues frequented by young drug users.