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Background: Viral hepatitis is a leading cause of death worldwide. The World Health Organisation introduced a target to reduce hepatitis C virus (HCV) as a public health threat by 2030. Testing and treatment of those at elevated risk of infection in prison is key to achieving disease elimination. An opt-out testing policy for those in prison was introduced in Wales, UK, in 2016., Methods: We analysed all Wales laboratory data where the testing site was a prison. We analysed numbers tested and positivity for a 14-month period before and after the introduction of opt-out testing policy., Results: Between September 2015 and December 2017, 6949 HCV tests were from prison settings in Wales, equating to 29% of admissions to prison (P < 0.001). All but one prison increased testing following the introduction of opt-out policy. Percentage positivity for HCV remained at 11% before and after opt-out policy (P = 0.572). Short-stay prisons saw higher rates of HCV positivity than long stay., Conclusion: Data suggest implementation of opt-out policy improved uptake and diagnosis of HCV amongst those in prison; however, further effort is required to fully embed screening for all. Positivity remains high amongst those in prison, particularly in short-stay prisons. Laboratory data can support audit of opt-out policy., (© The Author(s) 2020. Published by Oxford University Press on behalf of Faculty of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

Prisons provide an ideal setting in which to carry out blood-borne virus testing among a high-risk population. This paper describes a nurse-led testing programme offered to all prisoners within the substance misuse unit at a local prison in South Wales over a 4-year period. Challenges to organizing such a clinic within the prison setting are discussed. Between April 2006 and April 2010, approximately 4500 prisoners were admitted through the substance misuse unit. Blood-borne virus testing took place among 176 prisoners, of which 24 were hepatitis C seropositive, 19 were confirmed as virus-positive, and eight were referred to specialist teams to consider treatment. Among prison populations blood-borne virus testing needs to be encouraged and improved. Offering testing provides opportunities for harm minimization, education and referrals for treatment. Such provisions are needed to benefit the health of individuals, their families and the wider public health.