The Experts below are selected from a list of 210 Experts worldwide ranked by ideXlab platform
Willi Mcfarland - One of the best experts on this subject based on the ideXlab platform.
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Prevalence and Predictors of Conscious Risk Behavior Among San Franciscan Men who have Sex with Men
AIDS and behavior, 2012Co-Authors: Yea-hung Chen, H. Fisher Raymond, Michael Grasso, Binh Nguyen, Tyler Robertson, Willi McfarlandAbstract:We estimated the prevalence of conscious risk, specifically defined as unprotected anal intercourse with an HIV-serodiscordant partner, and identified individual-level and partnership-level predictors of this behavior. Conscious risk was estimated to be practiced by 4.8% of HIV-negative MSM and 15.7% of HIV-positive MSM over a six-month period (p < 0.01). Among HIV-negative MSM, episodes of conscious risk were estimated to be more frequent among individuals between the ages of 18 and 24 (compared to those 55 years of age or older), among African Americans and Whites (compared to Latinos and Asians), individuals earning less than 10,000 dollars per year (compared to those earning 50,000 and 70,000 dollars per year), and among users of methamphetamine, downers, pain killers, and Amyl Nitrate (poppers). Among HIV-positive MSM, episodes of conscious risk were more frequent among Whites and Asians (compared to those of “other” races, i.e., those of mixed race, or those who did not exclusively self-report as White, Black, Latino, or Asian), those with full-time employment (as opposed to those with part-time employment), those earning between 30,000 and 50,000 dollars per year or 70,000 dollars per year or greater (compared to those earning under 10,000 dollars per year), and recent users of poppers. Conscious risk was more frequently reported in partnerships with large age gaps and in main partnerships (as opposed to casual or exchange partnerships). Individuals at high risk for conscious risk may be ideal candidates for pre-exposure prophylaxis (PrEP).
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Viagra use in a community-recruited sample of men who have sex with men, San Francisco.
Journal of acquired immune deficiency syndromes (1999), 2003Co-Authors: Priscilla Lee Chu, Willi Mcfarland, Steven Gibson, Darlene Weide, Jeff Henne, Paul Miller, Teddy Partridge, Sandra SchwarczAbstract:The authors conducted a community-based anonymous survey of 837 men who have sex with men (MSM) to gauge the extent of Viagra (sildenafil citrate) use, its association with high-risk sexual behavior, and its combination with other drugs. Participants' mean age was 35 years, 67% were white, and 66% had a college degree. The majority (76%) reported anal sex in the past 6 months, with 49% reporting always using condoms. Overall, 32% had ever used Viagra (CI: 29%-36%). Significant independent predictors of Viagra use were white race, older age, HIV positivity, illicit drug use, and having had unprotected anal sex with potentially serodiscordant partners. Over one third of Viagra users had combined Viagra with other drugs, 18% with Amyl Nitrate. Only a minority (44%) obtained Viagra under the care of a physician. For some MSM, Viagra appears to be an emerging contributing factor to unsafe sex, potentially increasing HIV transmission. HIV care and prevention providers should target Viagra users for enhanced education on safer sex and potentially harmful drug interactions.
Sandra Schwarcz - One of the best experts on this subject based on the ideXlab platform.
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Viagra use in a community-recruited sample of men who have sex with men, San Francisco.
Journal of acquired immune deficiency syndromes (1999), 2003Co-Authors: Priscilla Lee Chu, Willi Mcfarland, Steven Gibson, Darlene Weide, Jeff Henne, Paul Miller, Teddy Partridge, Sandra SchwarczAbstract:The authors conducted a community-based anonymous survey of 837 men who have sex with men (MSM) to gauge the extent of Viagra (sildenafil citrate) use, its association with high-risk sexual behavior, and its combination with other drugs. Participants' mean age was 35 years, 67% were white, and 66% had a college degree. The majority (76%) reported anal sex in the past 6 months, with 49% reporting always using condoms. Overall, 32% had ever used Viagra (CI: 29%-36%). Significant independent predictors of Viagra use were white race, older age, HIV positivity, illicit drug use, and having had unprotected anal sex with potentially serodiscordant partners. Over one third of Viagra users had combined Viagra with other drugs, 18% with Amyl Nitrate. Only a minority (44%) obtained Viagra under the care of a physician. For some MSM, Viagra appears to be an emerging contributing factor to unsafe sex, potentially increasing HIV transmission. HIV care and prevention providers should target Viagra users for enhanced education on safer sex and potentially harmful drug interactions.
Rob Stephenson - One of the best experts on this subject based on the ideXlab platform.
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HIV-Negative Partnered Men's Willingness to Use Pre-Exposure Prophylaxis and Associated Factors Among an Internet Sample of U.S. HIV-Negative and HIV-Discordant Male Couples
LGBT health, 2015Co-Authors: Jason W. Mitchell, Rob StephensonAbstract:Abstract Purpose: Research on male couples' willingness to use pre-exposure prophylaxis (PrEP) is critically lacking. Methods: A cross-sectional 2011 Internet survey collected dyadic data from 275 HIV-negative and 58 HIV-discordant male couples to describe 631 HIV-negative partnered mens' willingness to use PrEP and associated couple-level demographic and behavioral factors with multivariate multilevel modeling. Results: Fifty-three percent were very to extremely likely to use PrEP. Willingness was positively associated with being in a mixed race and behaviorally non-monogamous relationship, and with Amyl Nitrate use with sex outside the relationship. Willingness was negatively associated with having a college education. Conclusion: Prevention efforts should educate male couples about the potential benefits of PrEP.
Linda A. Valleroy - One of the best experts on this subject based on the ideXlab platform.
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Very young gay and bisexual men are at risk for HIV infection: the San Francisco Bay Area Young Men's Survey II.
Journal of acquired immune deficiency syndromes (1999), 2000Co-Authors: Craig R. Waldo, William Mcfarland, Mitchell H. Katz, Duncan A. Mackellar, Linda A. ValleroyAbstract:Objectives: To compare HIV seroprevalence and sexual risk behavior among very young gay and bisexual men (aged 15-17 years) and their older counterparts (aged 18-22 years). To examine drug-use patterns and correlates of sexual risk behavior in both of these age groups. Design and Methods: An interviewer-administered cross-sectional survey of 719 gay and bisexual males between 15 and 22 years old was conducted through a venue-based sampling design. Blood specimens were collected and tested for HIV antibodies, hepatitis B, and syphilis. Interviews assessed sexual and drug-use behavior as well as psychosocial variables believed to be related to sexual risk-taking, including self-acceptance of gay or bisexual identity, perceptions of peer norms concerning safer sex, and perceptions of the ability to practice safer sex (safer sex self-efficacy). Results: Of the 719 participants, 100 (16.2%) were aged between 15 and 17 years. HIV seroprevalence was somewhat lower among those aged 15 to 17 years (2.0%) compared with those aged 18 to 22 years (6.8%) Overall, the prevalence of hepatitis-B core antibody was significantly lower in the younger age group (5.0%) than in the older group (14.1%). The men aged 15 to 17 years used alcohol, ecstasy, and heroin less frequently than those aged 18 to 22 years. The age groups did not differ in the proportion of men who reported any unprotected anal intercourse in the previous 6 months (31.2%). In both age groups, use of amphetamines, ecstasy, and Amyl Nitrate was associated with unprotected anal intercourse. Self-acceptance of gay or bisexual identity was related to less sexual risk for those aged 15 to 17 years. In both age groups, greater safer sex self-efficacy was linked to less HIV sexual risk-taking. In the younger group, perceptions of peer norms that support safer sex were related to less risk behavior. Conclusions: Very young gay and bisexual men engage in unprotected anal sex at rates comparable with those for their somewhat older counterparts, raising serious concern over their risk of acquiring HIV infection. To prevent seroconversions. interventions must target those
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Infection: The San Francisco Bay Area Young Men's Survey II !
2000Co-Authors: Craig R. Waldo, William Mcfarland, Mitchell H. Katz, Sduncan Mackellar, Linda A. ValleroyAbstract:Objectives: To compare HIV seroprevalence and sexual risk behavior among very young gay and bisexual men (aged 15-17 years) and their older counterparts (aged 18-22 years). To examine drug-use patterns and correlates of sexual risk behavior in both of these age groups. Design and Methods: An interviewer-administered cross-sectional survey of 719 gay and bisexual males between 15 and 22 years old was conducted through a venue- based sampling design. Blood specimens were collected and tested for HIV antibodies, hepatitis B, and syphilis. Interviews assessed sexual and drug-use behavior as well as psychosocial variables believed to be related to sexual risk-taking, including self- acceptance of gay' or b sexua identity', perceptions of peer norms concerning safer sex, and perceptions of the abilitx, to practice safer sex (safer sex self-efficacy). Results: Of the 719 participants. 100 (16.2%) were aged between 15 and 17 years. H1V seroprevalence was somewhat lower among those aged 15 to 17 years (2.0%) compared with those aged 18 to 22 years (6.8%). Overall, the prevalence of hepatitis-B core antibody was significantly, lower in the younger age group (5.0%) than in the older group (14.1%). The men aged 15 to 17 years used alcohol, ecstasy, and heroin less frequently than those aged 18 to 22 years. The age groups did not differ in the proportion of men who reported an}' unprotected anal intercourse in the previous 6 months (31.2%). in both age groups, use of amphetamines, ecstasy, and Amyl Nitrate was associated with unprotected anal intercourse. Self-acceptance of gay' or bisexual identity was related to less sexual risk for those aged 15 to 17 vears. In both age groups, greater safer sex self-efficacy was linked to less HIV sexual risk-taking. In the younger group, perceptions of peer norms that support safer sex were related to less risk behavior. Conclusions: Very young gay' and bisexual men engage in unprotected anal sex at rates comparable with those for their somewhat older counterparts, raising serious concern met their risk of acquiring HIV infection. To prevent seroconversions, inter- ventions must target those < 18 years of age. and prevention programs should address the use of certain drugs in relation to sex and sexual risk-taking. To be most effective. programs should develop innovative communication strategies to take into account lack of self-acceptance of gay or bisexual identity and low self-efficacy for practicing safer sex.
Richard A. Jenkins - One of the best experts on this subject based on the ideXlab platform.
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Drug Use, High-Risk Sex Behaviors, and Increased Risk for Recent HIV Infection among Men who Have Sex with Men in Chicago and Los Angeles
AIDS and Behavior, 2008Co-Authors: James W. Carey, Roberto Mejia, Trista Bingham, Carol Ciesielski, Deborah Gelaude, Jeffrey H. Herbst, Michele Sinunu, Ekow Sey, Nikhil Prachand, Richard A. JenkinsAbstract:We examined how drugs, high-risk sexual behaviors, and socio-demographic variables are associated with recent HIV infection among men who have sex with men (MSM) in a case–control study. Interviewers collected risk factor data among 111 cases with recent HIV infection, and 333 HIV-negative controls from Chicago and Los Angeles. Compared with controls, cases had more unprotected anal intercourse (UAI) with both HIV-positive and HIV-negative partners. MSM with lower income or prior sexually transmitted infections (STI) were more likely to be recently HIV infected. Substances associated with UAI included Amyl Nitrate (“poppers”), methamphetamine, Viagra^® (or similar PDE-5 inhibitors), ketamine, and gamma hydroxybutyrate (GHB). Cases more frequently used Viagra^®, poppers, and methamphetamine during UAI compared with controls. In multivariate analysis, income, UAI with HIV-positive partners, Viagra^®, and poppers remained associated with recent HIV seroconversion. Better methods are needed to prevent HIV among MSM who engage in high-risk sex with concurrent drug use.