scholarly journals HIV surveillance and research for migrant populations: a protocol integrating respondent-driven sampling, case finding, and medicolegal services for Venezuelans living in Colombia (Preprint)

10.2196/36026 ◽  
2021 ◽  
Author(s):  
Andrea L Wirtz ◽  
Kathleen R Page ◽  
Megan Stevenson ◽  
José Rafael Guillén ◽  
Jennifer Ortíz ◽  
...  
Keyword(s):  
Case Finding ◽  
Respondent Driven Sampling ◽  
Hiv Surveillance ◽  
Migrant Populations

HIV surveillance and research for migrant populations: a protocol integrating respondent-driven sampling, case finding, and medicolegal services for Venezuelans living in Colombia (Preprint)

2021 ◽  
Author(s):  
Andrea L Wirtz ◽  
Kathleen R Page ◽  
Megan Stevenson ◽  
José Rafael Guillén ◽  
Jennifer Ortíz ◽  
...  
Keyword(s):  
Public Health ◽  
Local Community ◽  
National Health System ◽  
Case Finding ◽  
Hiv Treatment ◽  
Screening Tests ◽  
Respondent Driven Sampling ◽  
Ethical Challenges ◽  
Access To Treatment ◽  
Migrant Populations

BACKGROUND Epidemiologic research among migrant populations is limited by logistical, methodological, and ethical challenges, but necessary for informing public health and humanitarian programming. OBJECTIVE We describe a methodology to estimate HIV prevalence among Venezuelan migrants in Colombia. METHODS Respondent-driven sampling (RDS), a non-probability sampling method, was selected for attributes of reaching highly networked populations without sampling frames and analytic methods that permit estimation of population parameters. RDS was modified to permit electronic referral of peers via SMS and Whatsapp. Participants complete socio-behavioral surveys and rapid HIV and syphilis screening tests with confirmatory testing. HIV treatment is not available for migrants who have entered Colombia through irregular pathways; thus, medicolegal services integrated into post-test counseling provide staff lawyers and legal assistance to participants diagnosed with HIV or syphilis for sustained access to treatment through the national health system. Case finding is integrated into RDS to allow partner referral. The study is implemented by a local community-based organization providing HIV support services and related legal services for Venezuelans in Colombia. RESULTS Data collection launched in four cities in July and August 2021. As of November 2021, 3,105 of the target 6,100 participants were enrolled. CONCLUSIONS Tailored methods that combine community-led efforts with innovations in sampling and linkage to care can aid in advancing health research for migrant and displaced populations. Worldwide trends in displacement and migration underscore the value of improved methods for translation to humanitarian and public health programming.

scholarly journals The 12 city HIV Surveillance Survey among MSM in Brazil 2016 using respondent-driven sampling: a description of methods and RDS diagnostics

2019 ◽  
Vol 22 ◽  
Author(s):  
Carl Kendall ◽  
Ligia Kerr ◽  
Rosa Salani Mota ◽  
Mark Drew Crosland Guimarães ◽  
Andrea Fachel Leal ◽  
...  
Keyword(s):  
Hepatitis B ◽  
Sample Size ◽  
Analysis Data ◽  
Outcome Variable ◽  
Diagnostic Tools ◽  
Respondent Driven Sampling ◽  
Successive Sampling ◽  
Hiv Surveillance ◽  
Biological And Behavioral Surveillance ◽  
Sex With Men

ABSTRACT: Introduction: This paper details the methods used in the second national Biological and Behavioral Surveillance Survey (BBSS) of HIV, syphilis, and hepatitis B and C among men who have sex with men in Brazil. Methods: Respondent-driven sampling (RDS) was used in 12 cities in 2016. The targeted sample size was initiated with five to six seeds in each city. HIV, syphilis, and Hepatitis B and C rapid tests were offered to participants. RDS Analyst with Gile’s successive sampling (SS) estimator was used to adjust results as recommended and a weight for each individual was generated for further analysis. Data for the 12 cities were merged and analyzed using Stata 14.0 complex survey data tools with each city treated as its own stratum. Results: Duration of data collection varied from 5.9 to 17.6 weeks. 4,176 men were recruited in the 12 cities. Two sites failed to achieve targeted sample size due to a six-month delay in local IRB approval. No city failed to reach convergence in our major outcome variable (HIV). Conclusion: The comprehensive BBSS was completed as planned and on budget. The description of methods here is more detailed than usual, due to new diagnostic tools and requirements of the new STROBE-RDS guidelines.

scholarly journals Chronic hepatitis B virus case-finding in UK populations born abroad in intermediate or high endemicity countries: an economic evaluation

BMJ Open ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. e030183 ◽  
Author(s):  
Natasha K Martin ◽  
Peter Vickerman ◽  
Salim Khakoo ◽  
Anjan Ghosh ◽  
Mary Ramsay ◽  
...  
Keyword(s):  
Primary Care ◽  
Cost Effectiveness ◽  
Hepatitis B Virus ◽  
Hepatitis B ◽  
Cost Effective ◽  
Case Finding ◽  
Hbsag Prevalence ◽  
Migrant Populations ◽  
Additional Qaly ◽  
B Virus

ObjectivesThe majority (>90%) of new or undiagnosed cases of hepatitis B virus (HBV) in the UK are among individuals born in countries with intermediate or high prevalence levels (≥2%). We evaluate the cost-effectiveness of increased HBV case-finding among UK migrant populations, based on a one-time opt out case-finding approach in a primary care setting.DesignCost-effectiveness evaluation. A decision model based on a Markov approach was built to assess the progression of HBV infection with and without treatment as a result of case-finding. The model parameters, including the cost and effects of case-finding and treatment, were estimated from the literature. All costs were expressed in 2017/2018 British Pounds (GBPs) and health outcomes as quality-adjusted life-years (QALYs).InterventionHepatitis B virus case-finding among UK migrant populations born in countries with intermediate or high prevalence levels (≥2%) in a primary care setting compared with no intervention (background testing).ResultsAt a 2% hepatitis B surface antigen (HBsAg) prevalence, the case-finding intervention led to a mean incremental cost-effectiveness ratio of £13 625 per QALY gained which was 87% and 98% likely of being cost-effective at willingness to pay (WTP) thresholds of £20 000 and £30 000 per additional QALY, respectively. Sensitivity analyses indicated that the intervention would remain cost-effective under a £20 000 WTP threshold as long as HBsAg prevalence among the migrant population is at least 1%. However, the results were sensitive to a number of parameters, especially the time horizon and probability of treatment uptake.ConclusionsHBV case-finding using a one-time opt out approach in primary care settings is very likely to be cost-effective among UK migrant populations with HBsAg prevalence ≥1% if the WTP for an additional QALY is around £20 000.

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