“…Depending on the transmission route of HIV infection, coinfection prevalences differ strongly, with people who inject drugs and people from high-prevalence countries for both viruses being the most affected. In Eastern Europe, where intravenous drug use is the main driver of the HIV epidemic, HCV antibody prevalences of more than 50% of the HIV-infected population have been described [10]. Also for more than a decade an ongoing epidemic of acute hepatitis C infection has been observed in HIV-positive men who have sex with men (MSM) especially in urban centres in Europe, Australia, and the USA [11,12], where HCV transmission occurs in the setting of high-risk sexual behaviour and recreational drug use.…”