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Injection of new psychoactive substance snow blow associated with recently acquired HIV infections among homeless people who inject drugs in Dublin, Ireland, 2015.Giese, Coralie; Igoe, Derval; Gibbons, Zorina; Hurley, Caroline; Stokes, Siobhan; McNamara, Sinead; Ennis, Orla; O'Donnell, Kate; Keenan, Eamon; De Gascun, Cillian; et al. (Euro surveillance : bulletin Européen sur les maladies transmissibles = European communicable disease bulletin, 2015-10-08)In February 2015, an outbreak of recently acquired HIV infections among people who inject drugs (PWID) was identified in Dublin, following similar outbreaks in Greece and Romania in 2011. We compared drug and risk behaviours among 15 HIV cases and 39 controls. Injecting a synthetic cathinone, snow blow, was associated with recent HIV infection (AOR: 49; p = 0.003). Prevention and control efforts are underway among PWID in Dublin, but may also be needed elsewhere in Europe.