[HBV COVALENTLY CLOSED CIRCULAR DNA AS A MARKER OF PREVALENCE OF OCCULT HEPATITIS B IN PATIENTS WITH HBV, HDVAND HCV INFECTION IN UZBEKISTAN]

Evaluate significance of covalently closed circular DNA of hepatitis B virus as a marker for detection of occult viral hepatitis B in Uzbekistan population with hepatitis of various genesis.Blood plasma and liver biopsy from 39 patients with different severity levels of liver fibrosis and cirrhosis served as study material. HBV covalently closed circular DNA detection was carried out according to Pollicino T et al. (2004).Covalently closed circu- lar DNA of hepatitis B virus was detected in 82% of samples, including in 54.5% of patients with chronic viral hepatitis C (CVHC) and in 100% of patients with hepatitis of unknown etiology. Quantitative evaluation of content of covalently closed circular DNA of hepatitis B virus in liver tissue in patients with CVHB has shown an average of 2.5 copies of HBV genome as ccc DNA per cell, in patients with CVHB + D an average of 0.7 copies/cell, in patients with co-infection by HCV and HBV - 0.5 copies/cell, in patients with CVHC an average of 0.12 copies/cell, and in patients with cryptogenic hepatitis - 0.2 copies/cell.Detection of HBV DNA is a complex problem for effective laboratory diagnostics of hepatitis. Detection of HBV ccc DNA as a marker of occult hepatitis B in patients with CVHC and patients with hepatitis of unclear etiol- ogy is an. important factor for diagnostics, selection of adequate therapy, prognosis of disease outcome and prevention of development of severe liver diseases.