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Respondent driven sampling

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https://www.readbyqxmd.com/read/29160436/use-of-injected-heroin-and-risk-of-hepatitis-c-in-three-cities-in-colombia
#1
Dedsy Yajaira Berbesi-Fernández, Angela Maria Segura-Cardona, Liliana Patricia Montoya-Velez, Alexandra Ángel Santamaría
INTRODUCTION: Hepatitis C is one of the most neglected diseases by governments internationally. OBJECTIVE: Identify the prevalence of hepatitis C and associated injection drug users in three cities of factors Colombia. METHODS: Cross-sectional study of 668 injecting drug users recruited through respondent-driven sampling, inquired about demographic characteristics and risk behaviors. Laboratory testing was used on filter paper and cases of hepatitis C viral load tests with RNA were confirmed...
July 2017: Revista Brasileira de Epidemiologia, Brazilian Journal of Epidemiology
https://www.readbyqxmd.com/read/29158993/antimicrobial-consumption-on-austrian-dairy-farms-an-observational-study-of-udder-disease-treatments-based-on-veterinary-medication-records
#2
Clair L Firth, Annemarie Käsbohrer, Corina Schleicher, Klemens Fuchs, Christa Egger-Danner, Martin Mayerhofer, Hermann Schobesberger, Josef Köfer, Walter Obritzhauser
Background: Antimicrobial use in livestock production is an important contemporary issue, which is of public interest worldwide. Antimicrobials are not freely available to Austrian farmers and can only be administered to livestock by veterinarians, or by farmers who are trained members of the Animal Health Service. Since 2015, veterinarians have been required by law to report antimicrobials dispensed to farmers for use in food-producing animals. The study presented here went further than the statutory framework, and collected data on antimicrobials dispensed to farmers and those administered by veterinarians...
2017: PeerJ
https://www.readbyqxmd.com/read/29158888/initial-evidence-that-non-clinical-autistic-traits-are-associated-with-lower-income
#3
William J Skylark, Simon Baron-Cohen
Among non-clinical samples, autistic traits correlate with a range of educational and social outcomes. However, previous work has not investigated the relationship between autistic traits and income, a key determinant of socio-economic status and well-being. In five studies (total N = 2491), we recruited participants without a diagnosis of autism from the general US population via an online platform and administered the short-form Autism Spectrum Quotient (AQ) as well as asked a range of demographic questions...
2017: Molecular Autism
https://www.readbyqxmd.com/read/29156368/self-and-team-prioritisation-effects-in-perceptual-matching-evidence-for-a-shared-representation
#4
Florence Enock, Jie Sui, Miles Hewstone, Glyn W Humphreys
Previous research has demonstrated that in-group favouritism occurs not only in higher-level judgments such as reward allocation, but also in low-level perceptual and attentional tasks. Recently, Moradi, Sui, Hewstone, and Humphreys (2015) found a novel effect of in-group bias on a simple perceptual matching task in which football fans responded more efficiently to stimuli newly associated with their own football team than stimuli associated with rival or neutral teams. This result is consistent with a robust self-bias effect in which individuals show a large performance advantage in responding to stimuli associated with the self over stimuli associated with a close friend or a stranger (Sui, He, & Humphreys, 2012)...
November 17, 2017: Acta Psychologica
https://www.readbyqxmd.com/read/29154368/precision-medicine-in-alcohol-dependence-a-controlled-trial-testing-pharmacotherapy-response-among-reward-and-relief-drinking-phenotypes
#5
Karl Mann, Corey R Roos, Sabine Hoffmann, Helmut Nakovics, Tagrid Leménager, Andreas Heinz, Katie Witkiewitz
Randomized trials of medications for alcohol dependence (AD) often report no differences between active medications. Few studies in AD have tested hypotheses regarding which medication will work best for which patients (ie, precision medicine). The PREDICT Study tested acamprosate and naltrexone versus placebo in 426 randomly assigned AD patients in a 3-month treatment. PREDICT proposed individuals whose drinking was driven by positive reinforcement (ie, reward drinkers) would have a better treatment response to naltrexone, whereas individuals whose drinking was driven by negative reinforcement (ie, relief drinkers) would have a better treatment response to acamprosate...
November 20, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29151198/high-substance-use-and-hiv-risk-behavior-among-young-argentine-men-who-have-sex-with-men
#6
Iván C Balán, Timothy Frasca, María A Pando, Rubén O Marone, Victoria Barreda, Curtis Dolezal, Alex Carballo-Diéguez, María M Ávila
In the United States young men who have sex with men have higher rates of substance use, higher HIV incidence, and less frequent HIV testing than their heterosexual counterparts and older MSM. Less is known about comparable populations in Latin America. As part of an epidemiological study, MSM were recruited through Respondent Driven Sampling in the metropolitan area of Buenos Aires, Argentina and answered a computerized behavioral survey. From the total of 500 MSM enrolled, a sub-sample of 233 aged 18-25 was analyzed...
November 18, 2017: AIDS and Behavior
https://www.readbyqxmd.com/read/29140871/hiv-prevalence-and-associated-risk-factors-among-men-who-have-sex-with-men-in-dar-es-salaam-tanzania
#7
Elia John Mmbaga, Kåre Moen, Germana Henry Leyna, Rose Mpembeni, Melkizedeck Thomas Leshabari
INTRODUCTION: Limited studies and differential risk behaviours among men who have sex with men(MSM) in Africa calls for population specific studies. We present results from the largest integrated bio-behavioural survey among MSM in Africa to inform programming. METHODS: This was a cross-sectional study utilizing respondent driven sampling to recruit MSM aged 18 and above. Data on socio-demographic characteristics and HIV-related risks were collected and all participants were tested for HIV, Herpes Simplex Virus Type-2 (HSV-2), Hepatitis-B Virus (HBV) and Syphilis...
November 13, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/29136744/-factors-associated-with-syphilis-hiv-infection-among-men-who-have-sex-with-men-in-shenzhen-2011-2016
#8
Y M Cai, Y J Song, H Liu, F C Hong
Objective: To investigate the factors associated with syphilis/HIV infection among men who have sex with men (MSM) maintaining a single sexual partner in Shenzhen. Methods: Respondent driven sampling and snowball sampling method were used to recruit MSM receiving voluntary counseling and testing in Shenzhen Rainbow clinic from 2011 to 2016. INCLUSION CRITERIA: aged 18 years and above; reported having one or more anal sexual partners in the recent 6 months. A total of 3 109 men who have sex with men (MSM) were involved in the study...
November 6, 2017: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/29135654/cost-effectiveness-of-peer-versus-venue-based-approaches-for-detecting-undiagnosed-hiv-among-heterosexuals-in-high-risk-new-york-city-neighborhoods
#9
Elizabeth R Stevens, Kimberly Nucifora, Qinlian Zhou, R Scott Braithwaite, Charles M Cleland, Amanda S Ritchie, Alexandra H Kutnick, Marya V Gwadz
INTRODUCTION: We used a computer simulation of HIV progression and transmission to evaluate the cost-effectiveness of a scale-up of three strategies to seek out and test individuals with undiagnosed HIV in New York City (NYC). SETTING: Hypothetical NYC population METHODS:: We incorporated the observed effects and costs of the three "seek and test" strategies in a computer simulation of HIV in NYC, comparing a scenario in which the strategies were scaled up with a one-year implementation or a long-term implementation with a counterfactual scenario with no scale-up...
November 6, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/29135652/are-hiv-seroconversions-among-young-men-who-have-sex-with-men-associated-with-social-network-proximity-to-recently-or-long-term-hiv-infected-individuals
#10
Ethan Morgan, Britt Skaathun, Rebeccah Duvoisin, Stuart Michaels, John A Schneider
Debate remains as to the relative HIV transmission contributions from individuals who are recently HIV infected and individuals who have long-term infections. In this study, we examine the relationship between new HIV seroconversions occurring among young Black men who have sex with men (YBMSM) and network proximity to recently or long-term HIV infected individuals. A cohort of YBMSM (N = 618) was generated through respondent driven sampling across three waves. A recent HIV infection was defined as either: 1) a confirmed seroconversion ≤9 months prior to interview date or 2) a laboratory confirmed acute infection; long-term HIV infected individuals were defined as a diagnosis date ≥9 months prior to interview date...
November 8, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/29132291/hiv-prevention-needs-for-men-who-have-sex-with-men-in-swaziland
#11
Bhekie Sithole
Men who have sex with men (MSM) have a high HIV burden and also often face multiple other challenges accessing HIV services, including legal and social issues. Although Swaziland recently started responding with interventions for MSM, significant gaps still exist both in information and programming. This study aimed to explore the HIV prevention needs of MSM in Swaziland, including factors elevating their risks and vulnerabilities to HIV infection; to find out what HIV prevention strategies exist; and to determine how best to meet the prevention needs of MSM...
December 2017: African Journal of AIDS Research: AJAR
https://www.readbyqxmd.com/read/29120828/the-efficacy-of-respondent-driven-sampling-for-the-health-assessment-of-minority-populations
#12
Grazyna Badowski, Lilnabeth P Somera, Brayan Simsiman, Hye-Ryeon Lee, Kevin Cassel, Alisha Yamanaka, JunHao Ren
BACKGROUND: Respondent driven sampling (RDS) is a relatively new network sampling technique typically employed for hard-to-reach populations. Like snowball sampling, initial respondents or "seeds" recruit additional respondents from their network of friends. Under certain assumptions, the method promises to produce a sample independent from the biases that may have been introduced by the non-random choice of "seeds." We conducted a survey on health communication in Guam's general population using the RDS method, the first survey that has utilized this methodology in Guam...
October 2017: Cancer Epidemiology
https://www.readbyqxmd.com/read/29116552/using-facebook-to-recruit-parents-to-participate-in-a-family-program-to-prevent-teen-drug-use
#13
Sabrina Oesterle, Marina Epstein, Kevin P Haggerty, Megan A Moreno
Despite strong evidence that family programs are effective in preventing adolescent substance use, recruiting parents to participate in such programs remains a persistent challenge. This study explored the feasibility of using Facebook to recruit parents of middle school students to a self-directed family program to prevent adolescent drug use. The study used paid Facebook ads aiming to recruit 100 parents in Washington and Colorado using marijuana- or parenting-focused messages. All ad-recruited parents were also invited to refer others in order to compare Facebook recruitment to web-based respondent-driven sampling...
November 7, 2017: Prevention Science: the Official Journal of the Society for Prevention Research
https://www.readbyqxmd.com/read/29112689/hiv-prevalence-and-behavioral-and-psychosocial-factors-among-transgender-women-and-cisgender-men-who-have-sex-with-men-in-8-african-countries-a-cross-sectional-analysis
#14
Tonia Poteat, Benjamin Ackerman, Daouda Diouf, Nuha Ceesay, Tampose Mothopeng, Ky-Zerbo Odette, Seni Kouanda, Henri Gautier Ouedraogo, Anato Simplice, Abo Kouame, Zandile Mnisi, Gift Trapence, L Leigh Ann van der Merwe, Vicente Jumbe, Stefan Baral
INTRODUCTION: Sub-Saharan Africa bears more than two-thirds of the worldwide burden of HIV; however, data among transgender women from the region are sparse. Transgender women across the world face significant vulnerability to HIV. This analysis aimed to assess HIV prevalence as well as psychosocial and behavioral drivers of HIV infection among transgender women compared with cisgender (non-transgender) men who have sex with men (cis-MSM) in 8 sub-Saharan African countries. METHODS AND FINDINGS: Respondent-driven sampling targeted cis-MSM for enrollment...
November 2017: PLoS Medicine
https://www.readbyqxmd.com/read/29112042/network-viral-load-a-critical-metric-for-hiv-elimination
#15
Britt Skaathun, Aditya S Khanna, Ethan Morgan, Samuel R Friedman, John A Schneider
BACKGROUND: Associations have been observed between an aggregate viral load measure, the community viral load (CVL) and new HIV diagnoses. The CVL aggregates viral loads within chosen geographic areas, restricting inferences about HIV acquisition risk to these areas. We develop a more precise metric, the Network Viral Load (NVL) to measure the composite viral load within a risk network of an HIV negative individual. METHODS: We examined the relationship between NVL and HIV infection among Young Men who have Sex with Men (YMSM) in Chicago, United States...
November 2, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/29111903/suicide-acceptability-and-sexual-orientation-results-from-the-general-social-survey-2008-2014
#16
John R Blosnich, Megan C Lytle, Robert W S Coulter, Darren L Whitfield
OBJECTIVES: Lesbian, gay, and bisexual (LGB) individuals have higher prevalence of lifetime suicide ideation and attempt than their heterosexual peers, but less is known about differences in suicide acceptability (i.e., believing suicide is a viable answer to a problem). The purpose of this study was to examine if LGB adults had greater suicide acceptability than heterosexual adults. METHODS: Four items in the General Social Surveys from 2008-2014 assessed whether a nationally representative sample of US adult respondents (n = 5,037) thought it acceptable for individuals to kill themselves if one: goes bankrupt, dishonors their family, is tired of living, or has an incurable disease...
November 7, 2017: Archives of Suicide Research: Official Journal of the International Academy for Suicide Research
https://www.readbyqxmd.com/read/29105323/factors-associated-with-hiv-testing-among-young-men-who-have-sex-with-men-in-myanmar-a-cross-sectional-study
#17
Minh D Pham, Poe Poe Aung, Aye Kyawt Paing, Naanki Pasricha, Paul A Agius, Waimar Tun, Ashish Bajracharya, Stanley Luchters
INTRODUCTION: In Myanmar, men who have sex with men (MSM) experience high risk of HIV infection. However, access to HIV testing and prevention services remains a challenge among this marginalized population. The objective of this study was to estimate population prevalence and correlates of prior HIV testing among young MSM (YMSM) and informs the development of HIV testing and intervention programmes that respond to the specific needs of this population. METHODS: Five hundred and eighty-five YMSM aged 18 to 24 years were recruited using respondent-driven sampling (RDS) in a cross-sectional survey conducted in six townships of Myanmar...
November 2017: Journal of the International AIDS Society
https://www.readbyqxmd.com/read/29095866/using-data-from-respondent-driven-sampling-studies-to-estimate-the-number-of-people-who-inject-drugs-application-to-the-kohtla-j%C3%A3-rve-region-of-estonia
#18
Jiacheng Wu, Forrest W Crawford, Mait Raag, Robert Heimer, Anneli Uusküla
Estimating the size of key risk populations is essential for determining the resources needed to implement effective public health intervention programs. Several standard methods for population size estimation exist, but the statistical and practical assumptions required for their use may not be met when applied to HIV risk groups. We apply three approaches to estimate the number of people who inject drugs (PWID) in the Kohtla-Järve region of Estonia using data from a respondent-driven sampling (RDS) study: the standard "multiplier" estimate gives 654 people (95% CI 509-804), the "successive sampling" method gives estimates between 600 and 2500 people, and a network-based estimate that uses the RDS recruitment chain gives between 700 and 2800 people...
2017: PloS One
https://www.readbyqxmd.com/read/29091176/-factors-associated-with-low-knowledge-on-hiv-aids-among-men-who-have-sex-with-men-in-brazil
#19
Raquel Regina de Freitas Magalhães Gomes, Maria das Graças Braga Ceccato, Lígia Regina Franco Sansigolo Kerr, Mark Drew Crosland Guimarães
This cross-sectional study analyzed social vulnerability, individual, and programmatic factors associated with low knowledge on HIV/AIDS among men who have sex with men (MSM). Respondent Driven Sampling (RDS) was used in 10 Brazilian cities. Knowledge scores on HIV/AIDS were estimated by Item Response Theory and categorized in three levels: high, medium, and low knowledge. Ordinal logistic regression was used for the analysis. Of the 3,746 MSM, 36.6%, 37.4%, and 26% showed high, medium, and low knowledge, respectively...
October 26, 2017: Cadernos de Saúde Pública
https://www.readbyqxmd.com/read/29079636/alk-fusions-in-a-wide-variety-of-tumor-types-respond-to-anti-alk-targeted-therapy
#20
Jeffrey S Ross, Siraj M Ali, Omotayo Fasan, Jared Block, Sumanta Pal, Julia A Elvin, Alexa B Schrock, James Suh, Sahar Nozad, Sungeun Kim, Hwa Jeong Lee, Christine E Sheehan, David M Jones, Jo-Anne Vergilio, Shakti Ramkissoon, Eric Severson, Sugganth Daniel, David Fabrizio, Garrett Frampton, Vince A Miller, Philip J Stephens, Laurie M Gay
BACKGROUND: Genomic fusions of the anaplastic lymphoma kinase gene (ALK) are a well-established therapy target in non-small cell lung cancer (NSCLC). From a survey of 114,200 clinical cases, we determined the prevalence of ALK rearrangements (rALK) in non-NSCLC tumors and report their responsiveness to therapies targeting ALK. MATERIALS AND METHODS: Comprehensive genomic profiling of 114,200 relapsed and metastatic malignancies, including both solid tumors and hematolymphoid cancers, was performed using a hybrid-capture, adaptor ligation-based next-generation sequencing assay...
October 27, 2017: Oncologist
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