Twenty-five patients with acute viral hepatitis and drug abuse (heroin) aged between 15 and 30 years were studied. They were hospitalized in the Department of Infectious Diseases and Epidemiology, Medical University of Varna, during the period from January till October, 1998. The following types of viral hepatitis were established: acute viral hepatitis A (AVH-A) - in 7 patients, acute viral hepatitis В (AVH-B) - in two, acute viral hepatitis С (AHV-C) - in 6, non-defined AVH - in 9, and toxic hepatitis - in one patient. Most cases with AVH-C were clinically clearly manifested and there were no diagnostic difficulties. Probably, the non-defined AVH cases belonged to AVH-C infection but they remained not proved because of the absent diagnostic opportunities.
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