RDS RESEARCH


Catching the Uncatchable: Use of Respondent-Driven Sampling for Surveying Specialised Recreational Fisheries

Shane Griffiths , CSIRO Marine and Atmospheric Research, Dutton Park, Qld, Australia

Researchers in epidemiology and social sciences, routinely survey rare, ‘hidden’ or ‘hard-to-reach’ populations within the general community (e.g. HIV carriers, sex workers, illicit drug users) by penetration of social networks rather than by interception of individuals. This paper introduces the idea of using Respondent-Driven Sampling (RDS), a form of chain-referral (or “snowball”) sampling, as a cost-effective means of obtaining representative catch rate estimates from elusive specialised recreational fisheries that lack a complete sampling frame using retrospective (e.g. recall) or prospective (e.g. angler diary) surveys. Unfortunately, the total recreational catch cannot be reliably estimated using a single RDS survey since the total population size of fishers is unknown, which is required to expand catch rate estimates. However, by undertaking a capture-recapture survey within multiple RDS surveys, we demonstrate how the population size may be estimated using heterogeneous mark-recapture models, and thus, allowing the total harvest of particular species to be estimated for specialised recreational fisheries.

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Correlates of HIV Risk Among Injecting Drug Users in Sixteen Ukrainian Cities

We present findings from a HIV survey using respondent driven sampling among 3,711 injecting drug users (IDUs) in 16 cities in Ukraine in 2008. Eligible participants were males and females who injected drugs in the past 1 month, ≥16 years and lived/worked in their respective interview area. The impact of injecting and sexual risk behaviors on HIV-infection were analyzed using four logistic models. Overall HIV prevalence was 32%. In the sexual risk model, paying for sex in the past 3 months and condom use during last sex increased the odds of HIV infection. Being female, having greater than 3 years…

Source: AIDS and Behavior – September 28, 2010 Category: Infectious Diseases Tags: AIDS and Behavior Source Type: research

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CDC HIV Testing Guidelines and the Rapid and Conventional Testing Practices of Homeless Youth

AIDS Education and Prevention 22(4): 312-327 The study’s aims were to describe rapid and conventional HIV testing practices and referrals/linkages to services posttest among homeless youth in New York City. We also examined variation among service-involved youth, street youth, and nomads. Respondent-driven sampling was used to recruit 217 homeless youth who participated in structured interviews. Almost all youth were tested in the past year (82%). Most received pretest/posttest counseling (> 77%). Rapid testing was common and conducted in diverse settings. However, youth reported that rates of referral/linkage to services …

Source: AIDS Education and Prevention – August 13, 2010 Category: Infectious Diseases Authors: Marya Viorst GwadzCharles M. ClelandRobert QuilesDavid NishJohn WelchLucky S. MichaelsJose L. GonzalezAmanda S. RitchieNoelle R. Leonard Source Type: research

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Can Respondent Driven Sampling be Used to Recruit Homogeneous Samples Over Time?

Purpose: We compare injection drug users (IDU) recruited through respondent driven sampling (RDS) during the first two IDU cycles of the National HIV Behavioral Surveillance Project (NHBS). Our goal is to determine if the samples are homogeneous on basic characteristics, so that they may be considered to be from the same target population.

Source: Annals of Epidemiology – August 10, 2010 Category: Epidemiology Authors: J. Risser, A. Cates, A. Sayegh Tags: Abstracts Source Type: research

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High risk behavior for HIV transmission among former injecting drug users:a survey from Indonesia

Conclusion: Former IDUs may contribute significantly to the HIV-epidemic in Indonesia, and HIV-prevention should therefore also target this group, addressing sexual and other risk behavior.

Source: BMC Public Health – Latest articles – August 10, 2010 Category: Consumer Health News Authors: Shelly IskandarDiba BasarTeddy HidayatIke SiregarLucas PinxtenReinout van CrevelAndre Van der VenCor De Jong Source Type: research

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Linking parenting and informal mentor processes to depressive symptoms among rural African American young adult men.

Little is known about the rates of depressive symptoms among rural African American men during young adulthood or the processes that predict those rates. Many rural African American men in the deep South confront difficult environments that provide minimal resources and diminishing social support to help them embark on beneficial life paths. A model of protective processes hypothesized to deter depression among this population was tested that included autonomy-promoting parenting, informal mentoring, and protective self-regulatory processes. Data from a Respondent-Driven Sampling study with 116 rural African American men a…

Source: Cultural Diversity and Ethnic Minority Psychology – July 26, 2010 Category: Psychiatry & Psychology Authors: Kogan, Steven M.; Brody, Gene H. Source Type: research

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Effectiveness of Respondent-Driven Sampling to Recruit High Risk Heterosexual Men Who Have Multiple Female Sexual Partners: Differences in HIV Prevalence and Sexual Risk Behaviours Measured at Two Time Points

Townsend L, Johnston LG, Flisher AJ, Mathews C, Zembe Y.
SourceHealth Systems Research Unit, Medical Research Council, Tygerberg, Cape Town, South Africa.

Abstract: Regular HIV bio-behavioural surveillance surveys (BBSS) among high risk heterosexual (HRH) men who have multiple female sexual partners is needed to monitor HIV prevalence and risk behaviour trends, and to improve the provision and assessment of HIV prevention strategies for this population. In 2006 and 2008 we used respondent-driven sampling to recruit HRH men and examine differences in HIV prevalence and risk behaviours between the two time points. In both surveys, the target population had little difficulty in recruiting others from their social networks that were able to sustain the chain-referr…

Source: AIDS and Behavior – July 13, 2010 Category: Infectious Diseases Tags: AIDS and Behavior Source Type: research

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Comparing Selected Measures of Health Outcomes and Health-Seeking Behaviors in Chinese, Cambodian, and Vietnamese Communities of Chicago: Results from Local Health Surveys

We describe how local community organizations partnered to conduct a survey in the Chinese, Cambodian, and Vietnamese populations of Chicago to compare health outcomes and assess progress toward Healthy People 2010 goals. Interviews were conducted with 380 randomly selected Chinese adults through door-to-door sampling, and with 250 Cambodian adults and 150 Vietnamese adults through respondent-driven sampling. Data on 14 key health outcomes are described for this analysis. The three surveyed communities were generally poorer, less educated, more often foreign-born, and had less English proficiency than Asians nationally…

Source: Journal of Urban Health – July 13, 2010 Category: Health Management Tags: Journal of Urban Health Source Type: research

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Whither RDS? An investigation of Respondent Driven Sampling as a method of recruiting mainstream marijuana users

Conclusions: Research on marijuana use, and other forms of drug use hidden in the general population of adults, is important for informing and extending harm reduction beyond its current emphasis on ‘at-risk’ populations. Expanding harm reduction in a normalizing context, through innovative research on users often overlooked, further challenges assumptions about reducing harm through prohibition of drug use and urges consideration of alternative policies such as decriminalization and legal regulation.

Source: Harm Reduction Journal – July 9, 2010 Category: Drugs & Pharmacology Authors: Andrew HathawayElaine HyshkaPatricia EricksonMark AsbridgeSerge BrochuMarie-Marthe CousineauCameron DuffDavid Marsh Source Type: research

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Sampling Methods Used in Developed Countries for Behavioural Surveillance Among Men who have Sex with Men

Abstract: The aim of this review was to develop an overview of the sampling methods used in developed countries for behavioural surveillance among men who have sex with men. We abstracted information from peer-reviewed and non-peer-reviewed publications and, when needed, contacted first authors and surveillance authorities. Out of the 40 developed countries, 26 surveillance systems were identified in 23 countries. These surveillance systems made use of one or a combination of: venue-based sampling (n = 16); web-based sampling (n = 11); gay press/mail-out (n = 8); or respondent-dri…

Source: AIDS and Behavior – July 8, 2010 Category: Infectious Diseases Tags: AIDS and Behavior Source Type: research

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Correlates of Seeking Injection Assistance among Injection Drug Users in Tijuana, Mexico.

Assisted injection among injection drug users (IDUs) remains understudied. We recruited 1,056 IDUs using respondent-driven sampling in Tijuana, Mexico. Participants underwent HIV and syphilis testing and structured interviews. One-quarter (25%) sought injection assistance in the past 6 months. Seeking injection assistance was independently associated with being female (adjusted odds ratio [AOR]= 2.59; 95% confidence interval [CI]= 1.73-3.90), being born outside Baja California (AOR = 1.75; CI = 1.26-2.42), having recent abscesses (AOR = 2.59; CI = 1.93-3.47), using syringes previously used by others in the past 6 month…

Source: American Journal on Addictions – July 1, 2010 Category: Addiction Authors: Robertson AM, Vera AY, Gallardo M, Pollini RA, Patterson TL, Case P, Nguyen L, Strathdee SA Tags: Am J Addict Source Type: research

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Comparing Respondent-Driven Sampling and Targeted Sampling Methods of Recruiting Injection Drug Users in San Francisco

The objective of this article is to compare demographic characteristics, risk behaviors, and service utilization among injection drug users (IDUs) recruited from two separate studies in San Francisco in 2005, one which used targeted sampling (TS) and the other which used respondent-driven sampling (RDS). IDUs were recruited using TS (n = 651) and RDS (n = 534) and participated in quantitative interviews that included demographic characteristics, risk behaviors, and service utilization. Prevalence estimates and 95% confidence intervals (CIs) were calculated to assess whether there were differences in these varia…

Source: Journal of Urban Health – June 26, 2010 Category: Health Management Tags: Journal of Urban Health Source Type: research

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Walking the line: Stimulant use during sex and HIV risk behavior among Black urban MSM

Abstract: Background: Although the association of stimulant use to sexual risk taking and HIV transmission has been well documented among white gay men, stimulant use during sex continues to be under-explored among Black men who have sex with men (MSM).Methods: Black MSM (n=197) recruited via modified respondent-driven sampling between January and July 2008 completed an interviewer-administered quantitative assessment and optional HIV counseling and testing. Bivariate logistic regression procedures were employed to examine the association of demographics, sexual risk, and other psychosocial factors with stimulant use (at l…

Source: Drug and Alcohol Dependence – June 14, 2010 Category: Addiction Authors: Matthew J. Mimiaga, Sari L. Reisner, Yves-Michel Fontaine, Sean E. Bland, Maura A. Driscoll, Deborah Isenberg, Kevin Cranston, Margie R. Skeer, Kenneth H. Mayer Tags: Full length reports Source Type: research

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Response to Volkow P et al. – Cross-border paid plasma donation among injection drug users in two Mexico–U.S. border cities – International Journal of Drug Policy 20 (2009) 409–412

provide an analysis of intravenous drug users (IDUs) in two Mexico–US border towns, some of whom donated plasma in centers on the US side of the border. Their findings demonstrate that most of the IDUs attempting to donate did so prior to the 1980s. This is confirmed through their specifying manual plasmapheresis as the collection technology; this procedure has been superseded by automated plasmapheresis for over 20 years. Nevertheless, their finding that two IDUs donated in the period 2003–2005 is of concern, as by this time the safety paradigm which has ensured the safety of plasma therapies was in place. Lack of ver…

Source: International Journal of Drug Policy – May 24, 2010 Category: Addiction Authors: Joshua Penrod, Mary Gustafson, George Schreiber, Jan Bult, Albert Farrugia Tags: RESPONSES Source Type: research

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The Emerging HIV Epidemic among Men Who have Sex with Men in Tamil Nadu, India: Geographic Diffusion and Bisexual Concurrency

Abstract: In India, men who have sex with men (MSM) remain hidden because anal intercourse was criminalized and marriage socially required. We characterize HIV/STI prevalence among MSM in Tamil Nadu. Eligible participants were recruited using respondent-driven sampling in eight cities (n = 721). Median age was 28, 34% were married and 40% self-identified as homosexual. Median number of male partners in the prior year was 15; 45% reported any unprotected anal intercourse (UAI). HIV, herpes simplex virus-2 (HSV-2), chronic hepatitis B virus (HBV) and syphilis prevalence were 9, 26, 2 and 8%, respective…

Source: AIDS and Behavior – May 14, 2010 Category: Infectious Diseases Tags: AIDS and Behavior Source Type: research

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Distribution of hepatitis C virus genotypes among injecting drug users in Lebanon

Conclusions: The predominance of genotype 3 seems to be the predominant genotype among IDUs in Lebanon, a situation similar to that among IDUs in Western Europe. This study provides a base-line against possible future radical epidemiological variant that might occur in IDUs.

Source: Virology Journal – May 13, 2010 Category: Virology Authors: Ziyad MahfoudKassem KassakKhalil KreidiehSarah ShamraSami Ramia Source Type: research

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Measuring the incidence, prevalence and genetic relatedness of hepatitis C infections among a community recruited sample of injecting drug users, using dried blood spots

This study examined the utility of dried blood spot (DBS) specimens from IDUs recruited using respondent-driven sampling (RDS). Active IDUs underwent a computer-assisted interview and provided a DBS sample, tested for HCV antibody (anti-HCV) and HCV-RNA. HCV incidence was estimated from the proportion of anti-HCV-negative subjects found HCV-RNA-positive and estimates of the duration of this state. Results were adjusted according to RDS derived sample weights. HCV-RNA testing was performed on 288 DBS samples; 173 were anti-HCV-positive (54% weighted), of which 70 (42%, 95%CI 34[ndash]50% weighted) were RNA-negative indicati…

Source: Journal of Viral Hepatitis – April 27, 2010 Category: Infectious Diseases Authors: V. D. Hope, M. Hickman, S. L. Ngui, S. Jones, M. Telfer, M. Bizzarri, F. Ncube, J. V. Parry Source Type: research

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Assessing respondent-driven sampling [Statistics]

Respondent-driven sampling (RDS) is a network-based technique for estimating traits in hard-to-reach populations, for example, the prevalence of HIV among…

Source: Proceedings of the National Academy of Sciences – April 13, 2010 Category: Science Authors: Goel, S., Salganik, M. J. Tags: Statistics Source Type: research

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What Makes a Respondent-Driven Sampling “Seed” Productive? Example of Finding At-Risk Massachusetts Men Who Have Sex with Men

Abstract: Several recent studies have sought to elaborate upon the applicability and validity of respondent-driven sampling (RDS) to find hard-to-reach samples in general and men who have sex with men (MSM) in particular. Few published studies have elucidated the characteristics associated with initial RDS participants (“seeds”) who successfully recruited others into a study. A total of 74 original seeds were analyzed from four Massachusetts studies conducted between 2006 and 2008 that used RDS to reach high-risk MSM. Seeds were considered “generative” if they recruited two or more subsequent particip…

Source: Journal of Urban Health – March 31, 2010 Category: Health Management Tags: Journal of Urban Health Source Type: research

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Reaction to the Special Issue on Centralizing the Experiences of LGB People of Color in Counseling Psychology

This reaction article comments on the Major Contribution “Centralizing the Experiences of LGB People of Color in Counseling Psychology.” The content analysis of the published literature on lesbian, gay, and bisexual (LGB) people of color from 1998 to 2007 provides much-needed information that will help psychologists set future research agendas and move the field forward. The methodological issues associated with doing research on LGB and transgender people of color raise important issues to be considered from the inception of research questions to dissemination of findings. Respondent-driven sampling is proposed as an addi…

Source: The Counseling Psychologist – March 19, 2010 Category: Psychiatry & Psychology Authors: Zea, M. C. Tags: Articles Source Type: research

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HIV Risk Behaviours and their Relationship to Intimate Partner Violence (IPV) Among Men Who Have Multiple Female Sexual Partners in Cape Town, South Africa

Loraine Townsend, Rachel Jewkes, Catherine Mathews, Lisa Grazina Johnston, Alan J. Flisher, Yanga Zembe and Mickey Chopra

Abstract: HIV/AIDS and intimate partner violence (IPV) are growing public health concerns in South Africa. Knowledge about adult men’s perpetration of IPV and links between HIV risk behaviours and IPV is limited. Respondent driven sampling was used to recruit men who have multiple concurrent female sexual partners. Forty-one percent of the 428 recruited men had perpetrated IPV. Inconsistent condom use was associated with physical IPV; experiencing a symptom of a sexually transmitted infection and engaging in transactional sex were associated with physical and sexual IPV; problem alcohol use was associated w…

Source: AIDS and Behavior – March 10, 2010 Category: Infectious Diseases Tags: AIDS and Behavior Source Type: research

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Evaluating Recruitment among Female Sex Workers and Injecting Drug Users at Risk for HIV Using Respondent-driven Sampling in Estonia

Abstract: Few recent publications have highlighted theoretical and methodological challenges using respondent-driven sampling (RDS). To explore why recruitment with RDS may work in some populations and not in others, we assess the implementation of RDS to recruit female sex workers (FSWs) and injection drug users (IDUs) into a human immunodeficiency virus biological and risk behavior survey in Tallinn, Estonia. Recruitment of FSWs was slower and more challenging than that of IDUs. The IDU study recruited 350 participants within 7 weeks, while the FSW study recruited 227 participants over 28 weeks. I…

Source: Journal of Urban Health – February 4, 2010 Category: Health Management Tags: Journal of Urban Health Source Type: research

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Evaluating Respondent-Driven Sampling in a Major Metropolitan Area: Comparing Injection Drug Users in the 2005 Seattle Area National HIV Behavioral Surveillance System Survey with Participants in the RAVEN and Kiwi Studies.

Conclusion: The substantial differences in age and area of residence between NHBS-IDU1 and the other data sources suggest that RDS may not have accessed the full universe of Seattle area injection networks. Further empirical data are needed to guide the evaluation of RDS-generated samples. PMID: 20123167 [PubMed – as supplied by publisher]

Source: Annals of Epidemiology – February 1, 2010 Category: Epidemiology Authors: Burt RD, Hagan H, Sabin K, Thiede H Tags: Annals Epidemiology Source Type: research

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Gender Differences in Social Support and Depression among Injection Drug Users in Houston, Texas.

Conclusions: Lack of social support from a special person or significant other was associated with depressive symptoms in both males and females. Our findings suggest that depression and social support should be addressed when developing HIV prevention programs among injection drug users. PMID: 20141392 [PubMed – in process]

Source: The American Journal of Drug and Alcohol Abuse – January 1, 2010 Category: Addiction Authors: Risser J, Cates A, Rehman H, Risser W Tags: Am J Drug Alcohol Abuse Source Type: research

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Phylogenetic Analysis of HIV Sequences Obtained in a Respondent-Driven Sampling Study of Men Who Have Sex with Men

AIDS Research and Human Retroviruses , Vol. 0, No. 0.

Source: AIDS Research and Human Retroviruses – December 10, 2009 Category: Infectious Diseases Tags: article Source Type: research

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HIV and Related Risk Behavior Among Men Who Have Sex with Men in Zanzibar, Tanzania: Results of a Behavioral Surveillance Survey

Abstract: We conducted a respondent driven sampling survey to estimate HIV prevalence and risk behavior among men who have sex with men (MSM) in Unguja, Zanzibar. Men aged ≥15 years living in Unguja and reporting anal sex with another man in the past 3 months were asked to complete a questionnaire and provide specimens for biologic testing. HIV prevalence was 12.3% (95% confidence interval 8.7, 16.3). HIV infection was associated with injecting drugs in the past 3 months, Hepatitis C virus infection and being paid for sex in the past year. Interventions for MSM in Zanzibar are needed and shou…

Source: AIDS and Behavior – December 8, 2009 Category: Infectious Diseases Tags: AIDS and Behavior Source Type: research

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Serosorting for hepatitis C status in the sharing of injection equipment among Seattle area injection drug users

Conclusions: We conclude that a measurable degree of serosorting by HCV status is occurring among Seattle area IDU. Promotion of serosorting among HCV-positive IDU may be a useful harm reduction strategy for IDU who continue to practice sharing injection equipment. If judged efficacious, serosorting would provide a further rationale to encourage and support HCV testing among IDU.

Source: Drug and Alcohol Dependence – October 19, 2009 Category: Addiction Authors: Richard D. Burt, Hanne Thiede, Holly Hagan Tags: Full length reports Source Type: research

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Possible Increase in HIV and Syphilis Prevalence Among Men Who Have Sex with Men in Guangzhou, China: Results from a Respondent-Driven Sampling Survey

Abstract: A respondent-driven sampling survey was conducted to investigate HIV related serological and behavioral characteristics of men who have sex with men (MSM) in Guangzhou, China, and to identify associated factors potentially driving the epidemic. Respondent- Driven Sampling Analysis Tool and SPSS were used to generate adjusted estimates and to explore associated factors. Three hundred seventy-nine eligible participants were recruited. The adjusted prevalence of HIV and current syphilis infection are 5.2% and 17.5% respectively. 60.3% have unprotected anal sex in the past 6 months. Unprotected ana…

Source: AIDS and Behavior – October 14, 2009 Category: Infectious Diseases Tags: AIDS and Behavior Source Type: research

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Hepatitis C virus infection among drug injectors in St Petersburg, Russia: social and molecular epidemiology of an endemic infection

Conclusions Genotyping reveals that there have been at least five unique introductions of HCV genotypes into the IDU community in St Petersburg. Analysis of prevalent infections does not appear to correlate with the social networks of IDUs, suggesting that simple approaches to link these networks to prevalent infections, rather than incident transmission, will not prove meaningful. On a more positive note, the majority of IDUs are infected with 3a genotype that is associated with sustained virological response to antiviral therapy.

Source: Addiction – August 27, 2009 Category: Addiction Authors: Elijah Paintsil, Sergei V. Verevochkin, Elena Dukhovlinova, Linda Niccolai, Russell Barbour, Edward White, Olga V. Toussova, Louis Alexander, Andrei P. Kozlov, Robert Heimer Source Type: research

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Assessing IDU prevalence and health consequences (HCV, overdose and drug-related mortality) in a primary care trust: implications for public health action

Conclusion Locally specific and useful intelligence on injecting and its health consequence can be generated to inform local public health action, and may contribute information to validate national prevalence estimates.

Source: Journal of Public Health – August 24, 2009 Category: Health Management Authors: Hickman, M., Hope, V., Coleman, B., Parry, J., Telfer, M., Twigger, J., Irish, C., Macleod, J., Annett, H. Tags: Tobacco, Alcohol, Drugs and Fats Source Type: research

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High HIV Prevalence Among Men Who have Sex with Men in Soweto, South Africa: Results from the Soweto Men’s Study

Abstract: The Soweto Men’s Study assessed HIV prevalence and associated risk factors among MSM in Soweto, South Africa. Using respondent driven sampling (RDS) recruitment methods, we recruited 378 MSM (including 15 seeds) over 30 weeks in 2008. All results were adjusted for RDS sampling design. Overall HIV prevalence was estimated at 13.2% (95% confidence interval 12.4–13.9%), with 33.9% among gay-identified men, 6.4% among bisexual-identified men, and 10.1% among straight-identified MSM. In multivariable analysis, HIV infection was associated with being older than 25 (adjusted odds ratio (AOR) 3.8, …

Source: AIDS and Behavior – August 7, 2009 Category: Infectious Diseases Tags: AIDS and Behavior Source Type: research

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Exposing a hidden HIV epidemic among men who have sex with men

HSRC Review – Volume 7 – No. 2 – June 2009

One of the first studies among men who have sex with men (MSM) found a ‘hidden epidemic’ of HIV among MSM in South Africa in keeping with findings in other countries with generalised HIV epidemics. The results also suggest that South Africa may be experiencing parallel heterosexual and homosexual HIV epidemics with limited bridging between the two. CAROL METCALF and LAETITIA RISPEL, who presented these findings at the SA AIDS Conference in Durban in April, describe the study.

How the study was done

JEMS, which had approval from research ethics committees at the HSRC and Wits, used respondent-driven sampling (RDS) to recruit 285 men from Johannesburg and Durban into a survey. RDS is a method of recruitment used to obtain representative samples of hidden, hard-to-reach populations. Most participants were black Africans, under 25 years of age, and identified as being homosexual/gay. The survey was complemented with qualitative interviews with 32 key informants and focus group discussions with approximately 150 men.

The men who agreed to participate, completed a questionnaire and provided finger-prick blood specimens for anonymous HIV testing in a laboratory. Participants who did not know their HIV status were offered free, on-site voluntary counselling and testing (VCT). All men in the survey had had sex with at least one other man in the past year.

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Ethical Considerations in HIV/AIDS Biobehavioral Surveys That Use Respondent-Driven Sampling: Illustrations From Lebanon.

Respondent-driven sampling is especially useful for reaching hidden populations and is increasingly used internationally in public health research, particularly on HIV. Respondent-driven sampling involves peer recruitment and has a dual-incentive structure: both recruiters and their peer recruits are paid. Recent literature focusing on the ethical dimensions of this method in the US context has identified integral safeguards that protect against ethical violations. We analyzed a study of 3 groups in Lebanon who are at risk for HIV (injection drug users, men who have sex with men, female sex workers) and the ethical iss…

Source: American Journal of Public Health – July 16, 2009 Category: Global & Universal Authors: Dejong J, Mahfoud Z, Khoury D, Barbir F, Afifi RA Tags: Am J Public Health Source Type: research

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Respondent-driven sampling as Markov chain Monte Carlo

Respondent-driven sampling (RDS) is a recently introduced, and now widely used, technique for estimating disease prevalence in hidden populations. RDS data are collected through a snowball mechanism, in which current sample members recruit future sample members. In this paper we present RDS as Markov chain Monte Carlo importance sampling, and we examine the effects of community structure and the recruitment procedure on the variance of RDS estimates. Past work has assumed that the variance of RDS estimates is primarily affected by segregation between healthy and infected individuals. We examine an illustrative model to sho…

Source: Statistics in Medicine – July 1, 2009 Category: Statistics Authors: Sharad Goel, Matthew J. Salganik Source Type: Research

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Suicidal behavior among female sex workers in Goa, India: the silent epidemic

Conclusion: Suicidal behaviors among sex workers were common and associated with gender disadvantage and poor mental health. India’s widespread HIV-prevention programs for sex workers provide an opportunity for community-based interventions against gender-based violence and for mental health services delivery. PMID: 19443819 [PubMed – in process]

Source: American Journal of Public Health – June 28, 2009 Category: Global & Universal Authors: Shahmanesh M, Wayal S, Cowan F, Mabey D, Copas A, Patel V Tags: Am J Public Health Source Type: research

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Illicit use of pharmaceutical opioids among young polydrug users in Ohio.

This study, conducted in Columbus, Ohio, identified the predictors of current (past 30 day) illicit use of pharmaceutical opioids among young individuals (n=402) with a history of MDMA/ecstasy use who were recruited in 2002-2003 using respondent-driven sampling. To be eligible, participants had to be 18-30 years old, not involved in a drug abuse treatment, and report MDMA/ecstasy use at least once in the past 6 months. About 81% reported lifetime, and more than 31% reported current illicit use of pharmaceutical opioids. Logistic regression analysis revealed that illicit use of pharmaceutical tranquilizers and pharmaceutica…

Source: Addictive Behaviors – June 27, 2009 Category: Addiction Authors: Daniulaityte R, Falck RS, Wang J, Carlson RG Tags: Addict Behavior Source Type: research

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Identifying Hidden Sexual Bridging Communities in Chicago

This study takes initial steps toward moving the analysis of sexual network linkages beyond individual and risk group levels to a community level in which Chicago’s 77 community areas are examined as subpopulations for the purpose of identifying potential bridging communities. Of particular interest are “hidden” bridging communities; that is, areas with above-average levels of sexual ties with other areas but whose below-average AIDS prevalence may hide their potential importance for HIV prevention. Data for this analysis came from the first wave of recruiting at the Chicago Sexual Acquisition and Transmission of…

Source: Journal of Urban Health – June 19, 2009 Category: Health Management Tags: Journal of Urban Health Source Type: research

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

Abstract: 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 Comput…

Source: Journal of Urban Health – June 19, 2009 Category: Health Management Tags: Journal of Urban Health Source Type: research

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Homonegativity, Substance Use, Sexual Risk Behaviors, and HIV Status in Poor and Ethnic Men Who Have Sex with Men in Los Angeles

This study evaluates associations between internalized homonegativity and demographic factors, drug use behaviors, sexual risk behaviors, and HIV status among men who have sex with men (MSM) and with men and women (MSM/W). Participants were recruited in Los Angeles County using respondent-driven sampling (RDS) and completed the Internalized Homonegativity Inventory (IHNI) and questionnaires on demographic and behavioral factors. Biological samples were tested for HIV and for recent cocaine, methamphetamine, and heroin use. The 722 MSM and MSM/W participants were predominantly African American (44%) and Hispanic (28%), …

Source: Journal of Urban Health – June 13, 2009 Category: Health Management Tags: Journal of Urban Health Source Type: research

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Polydrug Use among IDUs in Tijuana, Mexico: Correlates of Methamphetamine Use and Route of Administration by Gender

We examined factors associated with methamphetamine use and routes of administration by gender among injection drug users (IDUs). From 2006–2007, IDUs ≥18 years old in Tijuana were recruited using respondent-driven sampling, interviewed, and tested for HIV, syphilis, and TB. Logistic regression was used to assess associations with methamphetamine use (past 6 months), stratified by gender. Among 1,056 participants, methamphetamine use was more commonly reported among females compared to males (80% vs. 68%, p < 0.01), particularly, methamphetamine smoking (57% vs. 34%; p < 0.01). Among females…

Source: Journal of Urban Health – June 12, 2009 Category: Health Management Tags: Journal of Urban Health Source Type: research

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Transactional Sex among Men and Women in the South at High Risk for HIV and Other STIs

Abstract: Transactional sex refers to selling sex (exchanging sex for money, drugs, food, shelter, or other items) or purchasing sex (exchanging money, drugs, food, shelter, or other items for sex). These activities have been associated with a higher risk for HIV and other sexually transmitted infections in a variety of populations and settings. This paper examines correlates of purchasing and selling sex in a large sample of drug users, men who have sex with men, and sex partners of these groups. Using respondent-driven sampling, participants were recruited between 2005 and 2008 in two urban and two rural co…

Source: Journal of Urban Health – June 10, 2009 Category: Health Management Tags: Journal of Urban Health Source Type: research

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Correlates of Unprotected Receptive Anal Intercourse
Among Gay and Bisexual Men: Kampala, Uganda

Abstract: We conducted a respondent-driven sampling survey (N = 215) to characterize correlates of risk for HIV infection among gay and bisexual men in Kampala, Uganda. We used RDSAT software to produce population estimates for measures and created exportable weights for multivariable analysis. Overall, 60.5% of gay/bi men identify as gay and 39.5% as bisexual; 91.6% are Ugandans. Unprotected receptive anal intercourse (URAI) was associated with identifying as gay, being younger and having had an HIV test in the past 6 months. Perceptions of being low risk to acquire or transmit HIV infection w…

Source: AIDS and Behavior – June 4, 2009 Category: Infectious Diseases Tags: AIDS and Behavior Source Type: research

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Risky sexual practices among men who have sex with men in Northeast Brazil: results from four sequential surveys.

This paper focuses on recent trends in risky sexual practices for HIV/AIDS among men who have sex with men (MSM) in Fortaleza, Ceará State, Brazil. Four cross-sectional surveys were conducted (1995, 1998, 2002, and 2005) among MSM 14 years or older who reported oral or anal sex in the previous 12 months. Sexual practices were considered risky whenever the respondent reported unprotected receptive or insertive anal intercourse in the six months preceding the interview. Different selection techniques were used to recruit the study population: snowball (1995, 1998, 2002 – 32%); time-space sampling (2002 – 68%); and respondent driven sampling …

Source: Cadernos de Saude Publica – June 1, 2009 Category: Global & Universal Authors: Gondim RC, Kerr LR, Werneck GL, Macena RH, Pontes MK, Kendall C Tags: Cad Saude Publica Source Type: research

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Simultaneous Recruitment of Drug Users and Men Who Have Sex with Men in the United States and Russia Using Respondent-Driven Sampling: Sampling Methods and Implications

Abstract: The Sexual Acquisition and Transmission of HIV Cooperative Agreement Program (SATHCAP) examined the role of drug use in the sexual transmission of the human immunodeficiency virus (HIV) from traditional high-risk groups, such as men who have sex with men (MSM) and drug users (DU), to lower risk groups in three US cities and in St. Petersburg, Russia. SATHCAP employed respondent-driven sampling (RDS) and a dual high-risk group sampling approach that relied on peer recruitment for a combined, overlapping sample of MSM and DU. The goal of the sampling approach was to recruit an RDS sample of MSM, DU, a…

Source: Journal of Urban Health – May 27, 2009 Category: Health Management Tags: Journal of Urban Health Source Type: research

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Suicidal Behavior Among Female Sex Workers in Goa, India: The Silent Epidemic. – Shahmanesh M, Wayal S, Cowan F, Mabey D, Copas A, Patel V.

Objectives. We sought to study suicidal behavior prevalence and its association with social and gender disadvantage, sex work, and health factors among female sex workers in Goa, India. Methods. Using respondent-driven sampling, we recruited 326 sex worker…

Source: SafetyLit: All (Unduplicated) – May 24, 2009 Category: Global & Universal Tags: Occupational Issues Source Type: news

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Sexual Mixing Patterns and Partner Characteristics of Black MSM in Massachusetts at Increased Risk for HIV Infection and Transmission

Abstract Black men who have sex with men (MSM) are at increased risk for HIV infection in the United States compared to other MSM. The aim of this study was to investigate Black MSM’s sexual mixing patterns and partner characteristics in relation to sexual risk taking, as a possible explanation for this observed increase in HIV incidence. Between January and July 2008, 197 Black MSM were recruited via modified respondent-driven sampling and completed optional pretest and post-test HIV serological testing, counseling, and a demographic, behavioral, and psychosocial assessment battery. Bivariate and multivar…

Source: Journal of Urban Health – May 24, 2009 Category: Health Management Tags: Journal of Urban Health Source Type: research

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Clinically Significant Depressive Symptoms as a Risk Factor for HIV Infection Among Black MSM in Massachusetts

Abstract High rates of depression have been observed among men who have sex with men (MSM) relative to the general adult male population; however, a dearth of research has explored depression among Black MSM. Black MSM (n = 197) recruited via modified respondent-driven sampling between January and July 2008 completed an interviewer-administered quantitative assessment and voluntary HIV counseling and testing. Bivariate and multivariable logistic regression procedures examined the associations of demographics, behavioral HIV risk factors, and psychosocial variables with depressive symptoms by severi…

Source: AIDS and Behavior – May 22, 2009 Category: Infectious Diseases Tags: AIDS and Behavior Source Type: research

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The harm inside: Injection during incarceration among male injection drug users in Tijuana, Mexico

We examined correlates of incarceration, injection inside and syringe sharing inside among male IDUs recruited in Tijuana, Mexico, using respondent driven sampling (RDS) (n=898). An interviewer administered survey collected data on sociodemographic, behavioral and contextual characteristics. Associations with (a) history of incarceration, (b) injection inside, and (c) syringe sharing inside were identified using univariate and multiple logistic regression models with RDS adjustment. Seventy-six percent of IDUs had been incarcerated, of whom 61% injected inside. Three quarters (75%) of those who injected shared syringes. U….

Source: Drug and Alcohol Dependence – May 19, 2009 Category: Addiction Authors: Robin A. Pollini, Jorge Alvelais, Manuel Gallardo, Alicia Vera, Remedios Lozada, Carlos Magis-Rodriquez, Steffanie A. Strathdee Tags: Full length reports Source Type: research

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HIV infection and risk behaviour of primary fentanyl and amphetamine injectors in Tallinn, Estonia: Implications for intervention

Conclusion: The injection of fentanyl is associated with elevated injecting risk behaviour derived from injection practice and situational risk factors, and needs urgently targeted interventions.

Source: International Journal of Drug Policy – April 23, 2009 Category: Addiction Authors: Ave Talu, Kristiina Rajaleid, Katri Abel-Ollo, Kristi Rüütel, Mati Rahu, Tim Rhodes, Lucy Platt, Natalia Bobrova, Anneli Uusküla Tags: Research Papers Source Type: research

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  1. Thanks for setting up this blog. Lisa Johnston

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