[Analysis of the DNA of the hepatitis B virus (HBV) in the serum and mononuclear cells of the peripheral blood in subjects with chronic infection by the HBV]. / Análisis del ADN del virus de la hepatitis B (VHB) en suero y células mononucleares de sangre periférica en sujetos con infección crónica por el VHB.

ABSTRACT

BACKGROUND: Viral replication is one of the determining factors of the natural history of infection by the hepatitis B virus (HBV). The clinical significance of the viremia and the DNA-HBV findings in mononuclear cells was therefore analyzed. METHODS: The epidemiologic history, liver function tests and the Knodell index were analyzed in 117 patients with chronic hepatitis B (CHB) and 33 healthy HBV carriers. The DNA-HBV was studied in serum and mononuclear cells by dot-blot and polymerase chain reaction (PCR). RESULTS: The DNA-HBV was detected by dot-blot in 62/117 subjects with and in CHB 3/33 healthy carriers. Viremis was determined by PCR in 107/117 patients with CHB and in 22/23 healthy carriers. Both aspartate aminotransferase (AST) as well as alanine aminotransferase (ALT) and the Knodell index were greater in the patients with positive DNA-HBV dot-blot. No significant differences were observed in the liver function tests and Knodell index with regard to the viremia detectable exclusively by PCR. In the mononuclear cells of peripheral blood, DNA-HBV was observed in 62% by dot-blot and in 95% by PCR. The presence of DNA-HBV by dot-blot in these cells was associated to greater disease activity. CONCLUSIONS: The activity of chronic hepatitis B was correlated with the presence of high viremic levels with no direct relation being observed between low grade viremia and disease aggressivity. The finding of DNA-HBV by dot-blot in mononuclear cells was associated with a greater activity of chronic hepatitis B, with these results being in agreement with the serologic data reported.