This study is an investigation of knowledge and attitudes about HCV, some aspects of risky behaviour, and HCV prevalence of young people (ie. under the age of 21) who use injectable drugs. This population has been selected for study because on-going research at this Centre into young drug users and HIV/AIDS shows that may of them may also be at considerable risk of HCV infection. However, unlike older IDUs who have been HCV tested in treatment agencies, they rarely come into drug treatment and very little is known about their risk of HCV. The aims of the study are to collect data that can be used for the development of education and prevention campaigns, to estimate exposure to HCV of those in the sample who are interviewed personally, and to offer education about HCV to all participants.