Maisa A, et al. - After acute or recent hepatitis C virus infection was reported in four homeless people who injected drugs (PWID) in Belfast in July and August 2016, an investigation was conducted by a multidisciplinary team (including public health, homeless and addiction services) to categorize risk behaviors and disrupt transmission chains. Researchers tested 156 PWID and found 45 (29%) cases, including 7 (16%) recent and 13 (29%) acute infections during the outbreak investigation until December 2017. Then then interviewed 68 PWID, including 12 cases. Heroin use was reported by all respondents, with 76% injecting at least once daily. They reported sharing spoons (58%) and filters (53%), as well as needles (27%) and syringes (29%). Hepatitis C positive individuals indicated a tendency for injecting in public spaces, but all exhibited worrying risk behaviors. Active monitoring with ongoing testing and extending existing harm reduction programs and access to bespoke services was suggested.