A Comparison of the Social and Sexual Networks of Crack-Using and Non-Crack Using African American Men who Have Sex with Men

The role of crack cocaine in accelerating the HIV epidemic among heterosexual populations has been well documented. Little is known about crack use as an HIV risk factor among African American men who have sex with men (AA MSM), a group disproportionately infected with HIV. We sought to compare the social and sexual network characteristics of crack-using and non-crack using AA MSM in Baltimore, MD, USA and to examine associations of crack use with sexual risk. Participants were recruited using street-based and internet-based outreach, printed advertisements, word of mouth. Inclusion criteria were being aged 18 years or older, African American or of black race/ethnicity, and have self-reported sex with another male in the prior 90 days. Crack use was operationalized as self-report of crack in the prior 90 days. Logistic regression was used to identify variables that were independently associated with crack use. Of 230 enrolled AA MSM, 37% (n = 84) reported crack use. The sexual networks of crack-using AA MSM were composed of a greater number of HIV-positive sex partners, exchange partners, and partners who were both sex and drug partners and fewer networks with whom they always use condoms as compared to non-crack using AA MSM. Crack use was independently associated with increased odds of bisexual identity and networks with a greater number of exchange partners, overlap of drug and sex partners, and lesser condom use. Results of this study highlight sexual network characteristics of crack-smoking AA MSM that may promote transmission of HIV. HIV interventions are needed that are tailored to address the social context of crack-smoking AA MSM risk behaviors.     

Urban Crack Users: Gender Differences in Drug Use,HIV Risk and Health Status

SUMMARY

This study assessed gender differences in drug use, HIV risk, and health status in a sample of urban crack users. Using targeted sampling, 1434 crack users (66% male and primarily African-American and Puerto Rican), were recruited from the streets of East Harlem, New York City. A standardized, structured interview was administered, drug use was validated by urinalysis, and HIV testing was offered. Gender differences were observed on sociodemo-graphic variables and patterns of drug use. Other than welfare, men and women cited different major sources of income. Women reported greater use of crack, and men were more likely to use injection drugs as well as crack. Data on sexual risk indicated that women had more sexual partners than men, but the percentage of unprotected vaginal sex for both men and women was greater for those who did not exchange sex for drugs and/or money. The number of persons already infected with HIV was substantial. Many reported histories of other sexually transmitted diseases which were generally higher among men. Future research should investigate the relationship between gender and other factors (e.g., ethnicity, geographic location) associated with HIV risk.     

Differences in Sexual Identity, Risk Practices, and Sex Partners between Bisexual Men and Other Men among a Low-Income Drug-Using Sample

Men who have sex with men and women (MSMW) represent an important target population for understanding the spread of HIV because of the inherent bridging aspect of their sexual behavior. Despite their potential to spread HIV between gender groups, relatively little recent data have been reported about this population as a subgroup distinct from men who have sex with men only. This paper analyzes data from the Chicago site of Sexual Acquisition and Transmission of HIV Cooperative Agreement Program to characterize 343 MSMW in terms of their demographics, drug use, sexual risk behavior, sexual identity, and sex partners. Results show the MSMW sample to be extremely disadvantaged; to have high rates of drug use, including injection and crack use; to report more female than male sex partners; to not differ from gay and heterosexual men in rates of condom use; and, for the most part, to report sexual identities that are consistent with their sex behavior. MSMW represent an important subpopulation in the HIV epidemic and should be targeted for risk reduction interventions.     

Changes in HIV seroprevalence and related behaviors among male injection drug users who do and do not have sex with men: New York City, 1990-1999

OBJECTIVES: This study examined HIV prevalence and risk behaviors among male injection drug users (IDUs) who have sex with men and among other male IDUs. METHODS: Male IDUs were interviewed and tested for HIV at a detoxification clinic during 1990 to 1994 and 1995 to 1999. Analyses compared male IDUs who do and do not have sex with men within and between periods. RESULTS: Initially, HIV seroprevalence and risk behaviors were higher among IDUs who have sex with men. Seroprevalence (initially 60.5% vs 48.3%) declined approximately 15% in both groups, remaining higher among those who have sex with men. Generally, injection prevalence, but not sexual risk behaviors, declined. CONCLUSIONS: Male IDUs who have sex with men are more likely to engage in higher-risk behaviors and to be HIV infected. Improved intervention approaches for male IDUs who have sex with men are needed.     

A comparison of HIV seropositive and seronegative young adult heroin- and cocaine-using men who have sex with men in New York City, 2000–2003

The purpose of this analysis was to determine the prevalence and correlates of HIV infection among a street-recruited sample of heroin-and cocaine-using men who have sex with men (MSM). Injection (injecting ≦3 years) and non-injection drug users (heroin, crack, and/or cocaine use<10 years) between 18 and 40 years of age were simultaneously street-recruited into two cohort studies in New York City, 2000–2003, by using identical recruitment techniques. Baseline data collected among young adult men who either identified as gay/bisexual or reported ever having sex with a man were used for this analysis. Nonparametric statistics guided interpretation. Of 95 heroin/ cocaine-using MSM, 25.3% tested HIV seropositive with 75% reporting a previous HIV diagnosis. The majority was black (46%) or Hispanic (44%), and the median age was 28 years (range 18–40). HIV-seropositive MSM were more likely than seronegatives to be older and to have an HIV-seropositive partner but less likely to report current homelessness, illegal income, heterosexual identity, multiple sex partners, female partners, and sex for money/drug partners than seronegatives. These data indicate high HIV prevalence among street-recruited, drug-using MSM compared with other injection drug use (IDU) subgroups and drug-using MSM; however, lower risk behaviors were found among HIV seropositives compared with seronegatives. Large-scale studies among illicit drug-using MSM from more marginalized neighborhoods are warranted.     

Violence and HIV Sexual Risk Behaviors Among Female Sex Partners of Male Drug Users

SUMMARY

Objective: Violence and HIV are emerging as interconnected public health hazards among drug users and their families. The purposes of this study are to (1) determine the prevalence of sexual and physical abuse of non-drug-using female sex partners of male drug users, and (2) ascertain the association between such violence and HIV-related risk behaviors. Methods: From 11/93 to 11/95, 208 female sex partners of injection drug or crack users in Collier County, FL, Tucson, AZ, and Portland, OR, were interviewed as part of a NIDA-funded HIV risk reduction project. Their mean age was 30 years (range 18–54); 21% were White, 6% African American, 7% Native American, and 63% Hispanic. Results: Of the 208 women, 28% reported being sexually molested and 20% raped before age 13; 41% reported being raped at least once in their lifetime. Forty-two percent of the women were physically assaulted by their sex partners; 36% had been threatened with assault by their sex partners. Those who were raped or threatened with assault were more likely to have multiple sex partners and engage in unprotected anal sex; there was a trend for women who had been physically assaulted to be more likely to engage in unprotected anal sex. Discussion: Rape, assault and the threat of assault are commonplace in the histories of female sex partners of male drug users. Experiences of violence and threats of violence are associated with heightened risk for the sexual transmission of HIV. Providers of HIV prevention need to understand the sequelae of violence, and design interventions which empower women to protect themselves from sexual transmission of HIV.     

Sex Trade Behavior among Heterosexually Active Homeless Men

Sex trade behavior is fairly common among homeless adults and may contribute to higher rates of HIV/AIDS in this population. This study provides a detailed examination of the sex trade-related attitudes and behaviors of homeless men by: (1) determining the prevalence of sex trade-related behaviors, including sex with female sex workers (FSWs); (2) identifying risk factors for having sex with FSWs; and (3) comparing men’s relationships with FSWs and non-FSWs in terms of relationship qualities and HIV-related risk behaviors, such as condom use. Structured interviews were conducted with a probability sample of 305 heterosexually active homeless men recruited from meal lines in Los Angeles. Recent sex with a FSW was reported by 26 % of men, and more likely among those who were older, used crack cocaine, had more sex partners, believed that sometimes men just need to have sex no matter what, and were embedded in networks that were denser and where risky sex was more normative. Compared to non-FSW partners, men with FSW partners felt less emotionally close to them, were more likely to believe the partner had never been tested for HIV, and were more likely to have sex with them under the influence of drugs or alcohol; however, they were not more likely to talk about using condoms or to use condoms with FSWs. Whether the relationship was considered “serious” was a stronger correlate of condom use than whether the partner was a FSW. Implications of these findings for HIV prevention efforts among homeless adults are discussed.     

Gender differences in the initiation of injection drug use among young adults

To characterize the circumstances surrounding initiation of injecting drug use, data were collected from 229 young, recently initiated injection drug users enrolled through community-based recruitment in Baltimore, Maryland. Gender differences in the pattern of initiation, the number of persons present at initiation, risky injection, and sexual behaviors at initiation, as well as behaviors after initiation, were examined. Overall, men and women were similar statistically with respect to age at initiation (19.5 years) and risk behaviors at initiation. While men were initiated by men (77%), women were more often initiated by women (65%), most of whom were friends (75%) or relatives (23%). The percentage of women infected with human immunodeficiency virus (HIV) was slightly greater than that of men, 17% versus 11% (P<.2), whether initiated by a man or a woman. Persons who self-initiated had a lower HIV prevalence and fewer HIV-related risk behaviors. Analysis of variance assessed differences in the HIV risk profiles of female and male IDUs who were intiated by someone of the same sex, of the opposite sex, or who self-initiated. These results indicated that (1) young women and men had similar patterns of injection initiation; (2) most women were initiated by female friends, runing counter to earlier literature claims that women were initated to injection drug use by male sex partners; and (3) women initiated by men had a marginally greater mean score on the HIV risk profile.     

Sexual Risk Behaviors of HIV-Positive,HIV-Negative,and Serostatus-Unknown Black Men Who Have Sex with Men and Women

Black men who have sex with men and women (MSMW) are at high risk for HIV infection and transmission. This study compared the sexual risk behaviors of Black MSMW who self-reported being HIV-positive with those who reported being HIV-negative and those who did not know their HIV status. Respondent-driven sampling (RDS) was used to recruit 1,154 Black MSM in Philadelphia and New York who completed an audio computer-assisted self-interview (ACASI). Of these men, 212 had engaged in anal sex with male partners and vaginal or anal sex with female partners in the past 3 months. A quarter (23.6%; n = 50) of MSMW self-reported testing positive for HIV at their last test, 59.4% (n = 126) reported testing negative for HIV at their last test, and 17.0% (n = 36) reported never having an HIV test. Multivariate logistic regression analysis revealed that HIV-positive MSMW were much less likely than HIV-negative men and never-tested men to have engaged in unprotected intercourse with main male and main female partners perceived to be HIV-negative or of unknown serostatus. However, HIV-positive men were equally as likely as HIV-negative men to have unprotected intercourse with non-main male and non-main female partners perceived as HIV-negative or of unknown serostatus. Our findings indicate that some HIV-positive MSMW engage in unprotected sex that places female and male partners at risk for HIV infection. However, MSMW who have never taken an HIV test, or who have not been recently tested, may be a greater source of HIV transmission to their female and male partners.     

Bridging Sexual Boundaries: Men Who Have Sex with Men and Women in a Street-Based Sample in Los Angeles

The purpose of the study was to determine the potential contribution of bisexual men to the spread of HIV in Los Angeles. We compare the characteristics and behaviors of men who have sex with men and women (MSMW) to men who have sex with only women (MSW) and men who have sex with only men (MSM) in Los Angeles. Men (N?=?1,125) who participated in one of the two waves of data collection from 2005 to 2007 at the Los Angeles site for NIDA’s Sexual Acquisition and Transmission of HIV—Cooperative Agreement Program were recruited using Respondent Driven Sampling. Participants completed Audio Computer Assisted Self Interviews and received oral HIV rapid testing with confirmatory blood test by Western Blot and provided urine specimens for detection of recent powder cocaine, crack cocaine, methamphetamine, or heroin use. MSM, MSW, or MSMW were defined by the gender of whom they reported sex with in the past 6 months. Chi-square tests and ANOVAs were used to test independence between these groups and demographic characteristics, substance use, and sexual behaviors. We fit generalized linear random intercept models to predict sexual risk behaviors at the partner level. Men were mostly of low income, unemployed, and minority, with many being homeless; 66% had been to jail or prison, 29% had ever injected drugs, and 25% had used methamphetamine in the past 30 days. The sample had high HIV prevalence: 12% of MSMW, 65% of MSM, and 4% of MSW. MSMW were behaviorally between MSW and MSM, except that more MSMW practiced sex for trade (both receiving and giving), and more MSMW had partners who are drug users than MSW. Generalized linear random intercept models included a partner-level predictor with four partner groups: MSM, MSMW-male partners, MSMW-female partners, and MSW. The following were significantly associated with unprotected anal intercourse (UAI): MSW (AOR 0.15, 95% CI 0.08, 0.27), MSMW-female partners (AOR 0.4, 95% CI 0.27, 0.61), HIV-positive partners (AOR 2.03, 95% CI 1.31, 3.13), and being homeless (AOR 1.37, 95% CI 1.01, 1.86). The factors associated with giving money or drugs for sex were MSMW-female partners (AOR 1.70, 95% CI 1.09, 2.65), unknown HIV status partners (AOR 1.72, 95% CI 1.29, 2.30), being older (AOR 1.02, 95% CI 1.00, 1.04), history of incarceration (AOR 1.64, 95% CI 1.17, 2.29), and being homeless (AOR 1.73, 95% CI 1.27, 2.36). The following were associated with receiving money or drugs for sex: MSW (AOR 0.53, 95% CI 0.32, 0.89), African American (AOR 2.42, 95% CI 1.56, 3.76), Hispanic (AOR 1.85, 95% CI 1.12, 3.05), history of incarceration (AOR 1.44, 95% CI 1.04, 2.01), history of injecting drugs (AOR 1.57, 95% CI 1.13, 2.19), and had been recently homeless (AOR 2.14, 95% CI 1.57, 2.94). While overall HIV-positive MSM had more UAI with partners of any HIV status than MSMW with either partner gender, among HIV-positive MSMW, more had UAI with HIV-negative and HIV status unknown female partners than male partners. Findings highlight the interconnectedness of sexual and drug networks in this sample of men—as most have partners who use drugs and they use drugs themselves. We find a concentration of risk that occurs particularly among impoverished minorities—where many men use drugs, trade sex, and have sex with either gender. Findings also suggest an embedded core group of drug-using MSMW who may not so much contribute to spreading the HIV epidemic to the general population, but driven by their pressing need for drugs and money, concentrate the epidemic among men and women like themselves who have few resources.     

HIV/STI Risk Among Male Mexican Immigrants in Dallas, Texas: Findings from a Pilot Study

Rates of HIV and STIs are higher among Latinos than the general U.S. population. A number of factors place Latino immigrants at particularly high risk. 128 male Mexican immigrants in Dallas, Texas completed personal interviews. We measured the prevalence of HIV/STI risk factors and identified sociodemographic and behavioral characteristics associated with higher risk. 9% of the total sample had 3 or more sexual partners in the past year. 5% had sex with a commercial sex worker (CSW). 11% had sex with another man. 11% had a previous STI diagnosis. Risk behaviors and STI history were more prevalent among men who had used illegal drugs or frequently consumed alcohol (18% of the sample) than among others. The overall prevalence of HIV/STI risk factors in this population was moderate. However, men who drank alcohol frequently and used illegal drugs were more likely than others to report engaging in behaviors that put them at risk for acquiring HIV/STI.     

Sexual and drug-use risk factors for HIV and STDs: a comparison of women with and without bisexual experiences

OBJECTIVES: This study was done to compare risk factors for HIV/STDs in women who reported having had sex with both men and women and women who reported having had sex with men only. METHODS: Female participants in a multisite, randomized HIV/STD prevention study in the Seattle area reported both having had sex with a man in the 3 months before and having at least 1 risk factor for HIV/STDs during the year before the study. Of these women, 38% who reported ever having had sex with a woman were compared with those who reported having had sex with men only. RESULTS: Women who had had sex with both men and women were more likely than women who had had sex with men only to report drug use in the 3 months before the study, a greater lifetime number of male partners, a sex partner who had had sex with a prostitute, an earlier age at sexual debut, and forced sexual contact (P < .01 for all comparisons). Women who had had sex with both men and women had a mean of 3.2 of these 5 risk factors, vs 2.1 among women who had had sex with men only (P < .001). CONCLUSION: Women who had had sex with both men and women were more likely than women who had had sex with men only to engage in multiple risk behaviors. Health workers should be aware of bisexual experience among women, since this may be a marker for multiple risk behaviors for HIV/STDs.     

Sexual Compulsivity and Sexual Risk in Gay and Bisexual Men

Much of our understanding of the association between the Sexual Compulsivity Scale (SCS) and sexual risk behavior among men who have sex with men (MSM) has been limited to samples of HIV positive MSM only. Using data from a community-based survey of gay and bisexual men (n = 1214), this analysis sought to further evaluate the association between the SCS and sexual risk behavior. The SCS was significantly associated with a variety of sexual risk behaviors, including having sex under the influence of club drugs, engaging in unprotected anal sex (receptive or insertive) with partners of the same and/or different HIV serostatus, identity as a barebacker, intentions to have bareback sex, number of recent sex partners, and temptation for unsafe sex. The SCS was also significantly associated with having engaged in a variety of specialized sexual behaviors (i.e., fetishes), many of which can increase HIV transmission risks. Finally, in multivariate analyses, the SCS significantly predicted unprotected sex with a non-main partner even when controlling for race, HIV serostatus, age, identity as a barebacker, and club drug use. These data indicate that the SCS may be able to serve as an indicator to detect HIV-associated sexual risk behavior in community-based samples of gay and bisexual men.     

沈阳市男同性恋者性病艾滋病相关KABP分析

目的 掌握沈阳市男同性恋人群性病艾滋病相关知识、态度及行为等现状，为制定有针对性的干预措施提供依据。方法 采用横断面调查和追踪调查相结合的方式，对342名出入酒吧的男同性恋者进行问卷调查及自愿检测。结果 调查对象年龄较轻，文化程度普遍较高，但艾滋病相关知识较缺乏，知识来源主要为电视、报纸及互联网，59.1％的人进行了HIV及梅毒检测，其中抗HIV阳性率为1％，梅毒(TPPA)阳性率为20.8％，11.7％认为自己很可能被感染HIV，47.1％觉得有50％的可能性。首次性行为年龄中位数为18岁，性伴数较多，平均为4.4个。且近半年36.3％的人有过女性性伴。91.5％近半年内有过肛交史，每次均使用安全套者只占11.1％。不用的原因是不喜欢或没必要。结论 本次调查的男同性恋者感染及传播艾滋病的危险行为普遍存在，相关知识知晓率低。安全套使用率低，该人群中已经具备了艾滋病流行的条件，应立即采取有效的措施加以控制，扭转其流行态势。     

Crystal Methamphetamine Use and Sexual Risk Behaviors among HIV-Positive and HIV-Negative Men Who Have Sex with Men in South Florida

Using data collected through venue-based sampling in South Florida from 2004 to 2005 as part of the Centers for Disease Control and Prevention-funded National HIV Behavioral Surveillance Among Men Who Have Sex with Men, we estimate the prevalence of crystal methamphetamine use and its association with high-risk sexual behaviors among a large and diverse sample of men who have sex with men (MSM) residing in South Florida. We also examine how these associations differ between HIV-positive and HIV-negative men. Bivariate analyses were used to assess the characteristics of study participants and their sexual risk behaviors by drug use and self-reported HIV status group. Of 946 MSM participants in South Florida, 18% reported crystal methamphetamine use in the past 12 months. Regardless of self-reported HIV status, crystal methamphetamine users were more likely to report high-risk sexual behaviors, an increased number of non-main sex partners, and being high on drugs and/or alcohol at last sex act with a non-main partner. Our findings indicate that crystal methamphetamine use is prevalent among the MSM population in South Florida, and this prevalence rate is similar, if not higher, than that found in US cities that have been long recognized for having a high rate of crystal methamphetamine use among their MSM populations. Notably, the use of crystal methamphetamine among both HIV-positive and HIV-negative MSM is associated with increased HIV-related risk behaviors.     

Sexual Behaviors of Non-gay Identified Non-disclosing Men Who Have Sex with Men and Women

The sexual behaviors of non-gay identified men who have sex with men and women (MSMW) who do not disclose their same-sex behavior to their female partners (referred to by some as men "on the down low") were examined, including the potential for these men to serve as a "bisexual bridge" for HIV and STD acquisition and transmission. Self-reported sexual behavior data were collected as part of an exploratory study of an ethnically diverse (41% African American, 35% Latino, 22% White, and 2% Asian) sample of 46 non-gay identified, non-disclosing MSMW in New York City. Men reported significantly more male than female sexual partners, but more frequent sex with females. The prevalence and frequency of unprotected sex did not differ significantly between male and female partners in the past 3 months. Men reported risk behavior more often with steady female and steady male partners (e.g., wives, girlfriends, boyfriends) than with more casual male and female partners (regular uncommitted partners, one-night stands). Men, especially African American/Black men, were significantly less likely to report receptive sexual behaviors with men than insertive behaviors. Unprotected sex was common with male and female partners in the past 3 months (e.g., 35% of anal sex with men; 50% of vaginal sex). Indeed, 22% of the sample (38% of those who had both recent males and female partners) reported both unprotected vaginal sex and unprotected anal sex with a male partner during the past 3 months. Although the study was limited by a small convenience sample, the findings suggest that non-gay identified non-disclosing MSMW are at risk for the acquisition and transmission of HIV and STDs, and may serve as a potential bridge, suggesting the need for further research and intervention targeting this unique population.     

Bridging Sexual Boundaries: Men Who Have Sex with Men and Women in a Street-Based Sample in Los Angeles

The purpose of the study was to determine the potential contribution of bisexual men to the spread of HIV in Los Angeles. We compare the characteristics and behaviors of men who have sex with men and women (MSMW) to men who have sex with only women (MSW) and men who have sex with only men (MSM) in Los Angeles. Men (N = 1,125) who participated in one of the two waves of data collection from 2005 to 2007 at the Los Angeles site for NIDA’s Sexual Acquisition and Transmission of HIV—Cooperative Agreement Program were recruited using Respondent Driven Sampling. Participants completed Audio Computer Assisted Self Interviews and received oral HIV rapid testing with confirmatory blood test by Western Blot and provided urine specimens for detection of recent powder cocaine, crack cocaine, methamphetamine, or heroin use. MSM, MSW, or MSMW were defined by the gender of whom they reported sex with in the past 6 months. Chi-square tests and ANOVAs were used to test independence between these groups and demographic characteristics, substance use, and sexual behaviors. We fit generalized linear random intercept models to predict sexual risk behaviors at the partner level. Men were mostly of low income, unemployed, and minority, with many being homeless; 66% had been to jail or prison, 29% had ever injected drugs, and 25% had used methamphetamine in the past 30 days. The sample had high HIV prevalence: 12% of MSMW, 65% of MSM, and 4% of MSW. MSMW were behaviorally between MSW and MSM, except that more MSMW practiced sex for trade (both receiving and giving), and more MSMW had partners who are drug users than MSW. Generalized linear random intercept models included a partner-level predictor with four partner groups: MSM, MSMW-male partners, MSMW-female partners, and MSW. The following were significantly associated with unprotected anal intercourse (UAI): MSW (AOR 0.15, 95% CI 0.08, 0.27), MSMW-female partners (AOR 0.4, 95% CI 0.27, 0.61), HIV-positive partners (AOR 2.03, 95% CI 1.31, 3.13), and being homeless (AOR 1.37, 95% CI 1.01, 1.86). The factors associated with giving money or drugs for sex were MSMW-female partners (AOR 1.70, 95% CI 1.09, 2.65), unknown HIV status partners (AOR 1.72, 95% CI 1.29, 2.30), being older (AOR 1.02, 95% CI 1.00, 1.04), history of incarceration (AOR 1.64, 95% CI 1.17, 2.29), and being homeless (AOR 1.73, 95% CI 1.27, 2.36). The following were associated with receiving money or drugs for sex: MSW (AOR 0.53, 95% CI 0.32, 0.89), African American (AOR 2.42, 95% CI 1.56, 3.76), Hispanic (AOR 1.85, 95% CI 1.12, 3.05), history of incarceration (AOR 1.44, 95% CI 1.04, 2.01), history of injecting drugs (AOR 1.57, 95% CI 1.13, 2.19), and had been recently homeless (AOR 2.14, 95% CI 1.57, 2.94). While overall HIV-positive MSM had more UAI with partners of any HIV status than MSMW with either partner gender, among HIV-positive MSMW, more had UAI with HIV-negative and HIV status unknown female partners than male partners. Findings highlight the interconnectedness of sexual and drug networks in this sample of men—as most have partners who use drugs and they use drugs themselves. We find a concentration of risk that occurs particularly among impoverished minorities—where many men use drugs, trade sex, and have sex with either gender. Findings also suggest an embedded core group of drug-using MSMW who may not so much contribute to spreading the HIV epidemic to the general population, but driven by their pressing need for drugs and money, concentrate the epidemic among men and women like themselves who have few resources.     

某区男男性行为人群性伴网络特征与高危行为分析

[目的]了解男男性行为（MSM）人群性伴网络特征及该人群中高危性行为的发生情况,探讨性病（STDs）、人类免疫缺陷病毒（HIV）在该人群中传播及向普通人群传播的模式,为开展性病、艾滋病预防控制提供依据。[方法]通过艾滋病自愿咨询检测门诊、同性恋人群活动场所、同性恋QQ群内动员、＂滚雪球＂等途径寻找MSM人群,招募151人,采用面对面匿名问卷调查方式收集信息。[结果]151名被调查者中最近6个月有30人（19.9%）与异性发生过性行为,高危性行为的发生率为53.3%;与同性性活动情况,其中91人（60.3%）有同性固定性伴,76人（50.3%）与非固定同性性伴的人发生过多次男男性行为（简称有多次男性伴）,77人（51.0%）发生过偶遇性行为（简称有偶遇男性伴）,10人（6.6%）从事商业性行为。而在与固定性伴、多次男性伴、偶遇男性伴、商业性行为中高危性行为的发生率依次是69.2%、57.9%、50.6%、70.0%。与固定男性伴高危性行为的发生率高于与偶遇男性伴高危性行为的发生率（P=0.014）。最近6个月有2种及以上性伴类型占58.9%。30名已感染HIV者中有多次男性伴及偶遇男性伴类型的比例分别为53.3%和63.3%;有过多次男性伴、偶遇男性伴性行为者中发生高危性行为的比例分别为50.0%和63.2%。感染HIV者与固定男性伴发生高危性行为的率低于未感染HIV者（P=0.029）。[结论]MSM人群性伴网络复杂多样,高危性行为发生率高。不仅使HIV在该人群中容易传播,且该人群已成为向普通人群传播HIV的＂桥梁＂人群。     

Highway cowboys, old hands, and Christian truckers: risk behavior for human immunodeficiency virus infection among long-haul truckers in Florida

This paper reports the results of ethnographic research to describe risk for human immunodeficiency virus (HIV) infection among long-haul truck drivers and the contexts and factors that influence risk and protective behaviors. Drivers were selected using purposive and snowball sampling at trucking-related businesses along major truck routes in Florida. Interview information was used to categorize truckers' levels of potential risk, describe behavioral characteristics of each group, identify sex partners, and assess perceptions of the risk of HIV infection. One-third of the 71 men interviewed had frequent sexual intercourse on the road with multiple partners, but few ever used condoms. Commercial sex workers were their most frequent partners for on-the-road sex. The risk was compounded by occupational conditions, which motivated truckers to drive long hours, often using drugs to stay alert. Sex, alcohol, and drugs were perceived as quick, effective stress relievers during downtime on long, lonely trips. Despite their high-risk behaviors, truckers tended to consider themselves at low risk for HIV infection and expressed a number of misconceptions regarding HIV transmission. For example, many truckers did not associate HIV risk with heterosexual contact or think that condoms were effective in preventing HIV transmission. In addition, many truckers maintained strong homophobic and anti-government opinions that reinforced their suspicion of safe-sex messages. These findings suggest that high-risk sexual behavior is common among long-haul truckers in the US, who may be at risk for HIV infection primarily because of unprotected sexual intercourse with multiple sex partners. Also, drug use may be associated with HIV risk behavior. The authors recommend establishing prevention programs that are developed by and for truckers, determining HIV seroprevalence rates of truckers, addressing drug and alcohol abuse among truckers, and altering industry policy that keeps truckers on the road too long for their own and others' safety.