The complex epidemiological process of viral hepatitis B is dominated, maintained and spreading out as a consequence of the high prevalence of the sources represented by HBsAg carriers.
Results: In the interval 2001-2005, the prevalence of HBsAg carriers in the Iaşi County was close to the national average level of about 6%. In the age group 5-9 years, the prevalence is higher in males. During the study interval prevalence was higher in the age group 10-14 years and especially after the age 24-25 years. Among blood donors the prevalence of HBsAg carriers is significantly higher in the occasional and first-time donors. The medical staff, other than physicians, working in different medical units and belonging to various age groups have not shown significant differences in the prevalence of HBsAg carriers.