“…Hybridization methods including Genostics liquid hybridization (Abbott Diagnostics, Abbott Park, Ill.), bDNA (Bayer Diagnostics, Tarrytown, N.Y.), and the PCRbased Amplicor HBV Monitor (Roche Molecular Diagnostics, Indianapolis, Ind.) assays have been useful for measuring the upper range of HBV viremia and have been compared extensively (1,3,14,16,18,19,22,23,34,39,43) but have lacked sensitivity, precluding the analysis of some chronic carrier patients with low serum levels of HBV DNA (4,20,41). Improvements in the limit of HBV DNA detection afforded by advanced hybridization and amplification methods have resulted in the discoveries that HBV DNA can be detected in low levels in some patients years after clinical recovery and even when circulating anti-HBs are present (36,47,53).…”