An analysis of Hepatitis C spreading and risking forms of behavior regarding Hepatitis C infecting in the environment of injected drug users (including IDUs who involved to commercial sex work) of Barnaul and presented in the article. The given research was conducted in the frameworks of scientific-research project by DFID (2003-2005) "Knowledge for action in HIV/AIDS in Russian Federation" in particular, at the Altai region. The Project was directed on systematization the base of knowledge about risking behavior among IDUs, epidemic context and the intervention in Russian Federation.

In the given approach a significant factors of HCV infecting were specified in the environment of street IDUs of Barnaul. Among these factors were: specifics of the drug injected, duration of using of needles and syringes, experience of prison, number of detentions and existence of STD. Besides, the knowledge on local peculiarities of HCV transmission could help in conduction of the more purposeful measures directed on the lowering the risk of infecting. The given research is significant not only in scientific but a practical sense too because an concentrates the attention at behavior of IDUs as one of the most dangerous risk indexes and reflects a potential danger of mass spreading of HCV-infection, HIV/AIDS and STDs in society. The obtained information has a significant importance for carrying out of effective treatment-prophylactic interventions and harm redaction programs.