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Respondent driven sampling

Cremildo João Baptista, Ines Dourado, Sandra Brignol, Tarcísio de Matos Andrade, Francisco Inácio Bastos
BACKGROUND: The burden of sexually transmitted infections (STIs), such as syphilis, is higher in low-income countries, with serious consequences and profound impact on sexual and reproductive health and human immunodeficiency virus (HIV) spread. Syphilis prevalence tend to be higher among people who misuse drugs than in the general population. OBJECTIVE: To assess syphilis and associated factors among polydrug users (PDU) in the city of Salvador, Northeast Brazil...
October 18, 2016: International Journal on Drug Policy
Y M Sun, W D Sun, H Y Lu, R L Xin, S F He, Q Zhang, H Yue, X G Fan, X Y Ma
Objective: To understand the HIV prevalence among men who have sex with men (MSM) and discuss the feasibility of respondent driven sampling (RDS) as a tool to conduct long term HIV surveillance in MSM in Beijing. Methods: From 2005 to 2012 RDS was used to recruit MSM for face-to-face interview with structured questionnaire to collect their demographic characteristics and HIV risk-related behavior. Blood samples were collected from them for HIV test. Results: A total of 427, 540, 607, 614, 616, 602, 579 and 600 MSM were surveyed, respectively, from 2005 to 2012...
October 10, 2016: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
Jalie A Tucker, Cathy A Simpson, Susan D Chandler, Casey A Borch, Susan L Davies, Shatomi J Kerbawy, Terri H Lewis, M Scott Crawford, JeeWon Cheong, Max Michael
Emerging adulthood often entails heightened risk-taking with potential life-long consequences, and research on risk behaviors is needed to guide prevention programming, particularly in under-served and difficult to reach populations. This study evaluated the utility of Respondent Driven Sampling (RDS), a peer-driven methodology that corrects limitations of snowball sampling, to reach at-risk African American emerging adults from disadvantaged urban communities. Initial "seed" participants from the target group recruited peers, who then recruited their peers in an iterative process (110 males, 234 females; M age = 18...
2016: Journal of Health Care for the Poor and Underserved
Margaret Giorgio, Loraine Townsend, Yanga Zembe, Mireille Cheyip, Sally Guttmacher, Farzana Kapadia, Cathy Mathews
Female cross-border migrants experience elevated risks for HIV, and migrants in South Africa may face additional risks due to the country's underlying HIV prevalence. These risks may be mitigated by the receipt of social support. A behavioral risk-factor survey was administered using respondent-driven sampling. Multivariable regression models assessed the relationships between social support and two HIV outcomes: HIV serostatus and perceived HIV status. Low social support was not significantly associated with HIV status (aOR = 1...
October 19, 2016: Journal of Immigrant and Minority Health
Chikondi A Mwendera, Christiaan de Jager, Herbert Longwe, Kamija Phiri, Charles Hongoro, Clifford M Mutero
BACKGROUND: Research on various determinants of health is key in providing evidence for policy development, thereby leading to successful interventions. Utilization of research is an intricate process requiring an understanding of contextual factors. The study was conducted to assess enhancing factors and barriers of research utilization for malaria policy development in Malawi. METHODS: Qualitative research approach was used through in-depth interviews with 39 key informants that included malaria researchers, policy makers, programme managers, and key stakeholders...
October 19, 2016: Malaria Journal
Samuel R Friedman, Enrique R Pouget, Milagros Sandoval, Diana Rossi, Pedro Mateu-Gelabert, Georgios K Nikolopoulos, John A Schneider, Pavlo Smyrnov, Ron D Stall
Attacks on peoples' dignity help to produce and maintain stigmatization and interpersonal hostility. As part of an effort to develop innovative measures of possible pathways between structural interventions or socially-disruptive Big Events and HIV outbreaks, we developed items to measure dignity denial. These measures were administered to 300 people who inject drugs (PWID), 260 high-risk heterosexuals who do not inject drugs, and 191 men who have sex with men who do not inject drugs (MSM). All of the PWID and many of the high risk heterosexuals and MSM were referred to our study in 2012-2015 by a large New York city study that used respondent-driven sampling; the others were recruited by chain-referral...
October 17, 2016: AIDS and Behavior
Juan Gea-Banacloche, Krishna Komanduri, Paul Carpenter, Sophie Paczesny, Stefanie Sarantopoulos, Jo-Anne Young, Nahed El Kassar, Robert Q Le, Kirk Schultz, Linda M Griffith, Bipin Savani, John R Wingard
Immune reconstitution following hematopoietic stem cell transplantation (HCT) beyond one year is not completely understood. Many transplant recipients who are free of graft versus host disease (GVHD) and not receiving any immunosuppression more than a year after transplant seem to be able to mount appropriate immune responses to common pathogens and respond adequately to immunizations. However, two large registry studies over the last two decades seem to indicate that infection is a significant cause of late mortality in some patients, even in the absence of concomitant GVHD...
October 14, 2016: Biology of Blood and Marrow Transplantation
S S Folkard, T D Bloomfield, P R J Page, D Wilson, D M Ricketts, B A Rogers
The use of patient reported outcome measures (PROMs) in trauma is limited. The aim of this pilot study is to evaluate qualitative responses and factors affecting planned return to work following significant trauma, for which there is currently a poor evidence base. National ethical approval was obtained for routine prospective PROMs data collection, including EQ-5D, between Sept 2013 and March 2015 for trauma patients admitted to the Sussex Major Trauma Centre (n=92). 84 trauma patients disclosed their intended return to work at discharge...
September 30, 2016: Injury
Ruiqi Wu, Langting Su, Pai-Feng Yang, Li Min Chen
Reactivation of deafferented cortex plays a key role in mediating the recovery of lost functions, although the precise mechanism is not fully understood. This study simultaneously characterized the dynamic spatiotemporal features of tactile responses in areas 3b and 1 before and 6-8 weeks after partial dorsal column lesion (DCL), and examined how the reactivation relates to the recovery of simple hand use in squirrel monkeys. A combination of high spatiotemporal resolution functional intrinsic optical imaging, microelectrode mapping, behavioral assessment, and tracer histology methods were used...
September 2016: ENeuro
Rochelle Steven, James C R Smart, Clare Morrison, J Guy Castley
Conservation of biodiversity, including birds, continues to challenge natural area managers. Stated preference methods (e.g. choice experiments - CE) are increasingly used to provide data for natural ecosystem valuations. Here we use a CE to calculate birders' willingness to pay for different levels of bio-ecological attributes (threatened species, endemic species and diversity) of birding sites, with hypothetical entry fees. The CE was delivered at popular birding and avitourism sites in Australia and the United Kingdom...
October 3, 2016: Conservation Biology: the Journal of the Society for Conservation Biology
Sarah M Peitzmeier, Anna Kågesten, Rajib Acharya, Yan Cheng, Sinead Delany-Moretlwe, Adesola Olumide, Robert Wm Blum, Freya Sonenstein, Michele R Decker
PURPOSE: Intimate partner violence (IPV) affects one in three women globally, with adolescent and young adult women at highest risk. Less is known about IPV perpetration. We compare the prevalence and correlates of IPV perpetration among 15- to 19-year-old adolescent males in Baltimore (United States), Johannesburg (South Africa), Delhi (India), and Shanghai (China). METHODS: A cross-sectional survey was conducted in 2013 with males aged 15-19 recruited via respondent-driven sampling from disadvantaged neighborhoods in four cities: Baltimore (United States), New Delhi (India), Johannesburg (South Africa), and Shanghai (China); total n = 751 ever-partnered men...
September 21, 2016: Journal of Adolescent Health: Official Publication of the Society for Adolescent Medicine
Lisa G Johnston, Katherine R McLaughlin, Shada A Rouhani, Susan A Bartels
Successive sampling (SS)-population size estimation (PSE) is a technique used to estimate the sizes of hidden populations using data collected in respondent-driven sampling (RDS) surveys. We here assess past estimations and use new data from an RDS survey to calculate a new PSE. In 2012, 852 adult women in South Kivu Province, Democratic Republic of Congo, who self-identified as survivors of sexual violence, resulting in a pregnancy, since the start of the war (in 1996) were sampled using RDS. We used imputed visibility, enrollment order, and prior estimates for PSE using SS-PSE in RDS Analyst...
September 20, 2016: Journal of Epidemiology and Global Health
John A Schneider, Michael Kozloski, Stuart Michaels, Britt Skaathun, Dexter Voisin, Nicola Lancki, Ethan Morgan, Aditya Khanna, Keith Green, Robert W Coombs, Samuel R Friedman, Edward Laumann, Phil Schumm
OBJECTIVE: To examine how history of criminal justice involvement(CJI) is related to HIV care continuum metrics among young Black men who have sex with men (YBMSM) 16-29 years of age. DESIGN: Population-based survey. METHODS: From 2013-2014 a representative sample of YBMSM was generated using Respondent Driven Sampling (RDS) in Chicago (n = 618). HIV antibody/Ag and RNA testing were performed using dry blood spots. Factors assessed in the care continuum included HIV testing, HIV diagnosis, linkage-to-care within 6 months, retention-in-care, adherence to antiretrovirals, and viral suppression...
September 20, 2016: AIDS
Alexei Zelenev, Elisa Long, Alexander R Bazazi, Adeeba Kamarulzaman, Frederick L Altice
BACKGROUND: HIV is primarily concentrated among people who inject drugs (PWID) in Malaysia, where currently HIV prevention and treatment coverage is inadequate. To improve the targeting of interventions, we examined HIV clustering and the role that social networks and geographical distance play in influencing HIV transmission among PWID. METHODS: Data were derived from a respondent-driven survey sample (RDS) collected during 2010 of 460 PWID in greater Kuala Lumpur...
September 15, 2016: International Journal on Drug Policy
John A Bourke, Philip J Schluter, E Jean C Hay-Smith, Deborah L Snell
BACKGROUND: Internationally, wheelchair users are an emerging demographic phenomenon, due to their increased prevalence and rapidly increasing life-span. While having significant healthcare implications, basic robust epidemiological information about wheelchair users is often lacking due, in part, to this population's 'hidden' nature. Increasingly popular in epidemiological research, Respondent Driven Sampling (RDS) provides a mechanism for generating unbiased population-based estimates for hard-to-reach populations, overcoming biases inherent within other sampling methods...
2016: F1000Research
David W Armitage
Biodiversity-ecosystem function (BEF) experiments routinely employ common garden designs, drawing samples from a local biota. The communities from which taxa are sampled may not, however, be at equilibrium. To test for temporal changes in BEF relationships, I assembled the pools of aquatic bacterial strains isolated at different time points from leaves on the pitcher plant Darlingtonia californica in order to evaluate the strength, direction and drivers of the BEF relationship across a natural host-associated successional gradient...
September 14, 2016: Proceedings. Biological Sciences
Stephanie A Kraft, Melissa Constantine, David Magnus, Kathryn M Porter, Sandra Soo-Jin Lee, Michael Green, Nancy E Kass, Benjamin S Wilfond, Mildred K Cho
BACKGROUND/AIMS: Participant understanding is a key element of informed consent for enrollment in research. However, participants often do not understand the nature, risks, benefits, or design of the studies in which they take part. Research on medical practices, which studies standard interventions rather than new treatments, has the potential to be especially confusing to participants because it is embedded within usual clinical care. Our objective in this randomized study was to compare the ability of a range of multimedia informational aids to improve participant understanding in the context of research on medical practices...
September 13, 2016: Clinical Trials: Journal of the Society for Clinical Trials
Wolfgang Hladik, Enos Sande, Mark Berry, Samuel Ganafa, Herbert Kiyingi, Joy Kusiima, Avi Hakim
We report on the results of a respondent-driven sampling survey among men who have sex with men (MSM) in Kampala, Uganda, where same-sex behavior is criminalized and highly stigmatized. We enrolled 608 MSM aged 18 + years and residing in greater Kampala from June 2012-November 2013. Anonymous data were collected through audio-computer assisted self-interviews; blood was tested for HIV-1 antibodies, CD4 + T cell counts, and viral load. Estimated HIV prevalence was 12.2 % (95 % confidence interval [CI] 8...
September 6, 2016: AIDS and Behavior
Christina Chung, Leah S Fischer, Angelica OʼConnor, Alvin Shultz
CONTEXT: CDC's Epidemiology and Laboratory Capacity for Infectious Diseases (ELC) Cooperative Agreement aims to help health departments strengthen core epidemiology capacity needed to respond to a variety of emerging infectious diseases. In fiscal year 2014, $6 million was awarded to 41 health departments for flexible epidemiologists (FEs). FEs were intended to help meet health departments' unique needs and support unanticipated events that could require the diversion of resources to specific emerging or reemerging diseases...
September 2, 2016: Journal of Public Health Management and Practice: JPHMP
Benjamin Wenz, Stine Nielsen, Martyna Gassowski, Claudia Santos-Hövener, Wei Cai, R Stefan Ross, Claus-Thomas Bock, Boris-Alexander Ratsch, Claudia Kücherer, Norbert Bannert, Viviane Bremer, Osamah Hamouda, Ulrich Marcus, Ruth Zimmermann
BACKGROUND: People who inject drugs (PWID) are at increased risk of acquiring and transmitting HIV and Hepatitis C (HCV) due to sharing injection paraphernalia and unprotected sex. To generate seroprevalence data on HIV and HCV among PWID and related data on risk behaviour, a multicentre sero- and behavioural survey using respondent driven sampling (RDS) was conducted in eight German cities between 2011 and 2014. We also evaluated the feasibility and effectiveness of RDS for recruiting PWID in the study cities...
2016: BMC Public Health
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