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Hepatitis B virus (HBV) DNA and RNA were quantified by digital PCR assays in 20–30 tissue pieces from each of 4 liver explants with cirrhosis caused by HBV. The within-patient variability of HBV RNA levels between pieces was up to a 1000-fold. Core RNA and S RNA levels were similar and correlated strongly when replication was high, supporting that transcription was from covalently closed circular DNA (cccDNA). By contrast, enhanced expression of S RNA relative to cccDNA and core RNA in patients with medium-high or low replication supports that HBV surface antigen (HBsAg) can be expressed mainly from integrated HBV DNA in such patients.

Quantification of Viral RNA in Multiple Pieces of Explant Liver Tissue Shows Distinct Focal Differences in Hepatitis B Infection