Abstract
Duck hepatitis B virus (DHBV) obtained from the serum of congenitally infected ducks was used to infect primary duck hepatocyte cultures 1 to 4 days after plating. Virus replication was demonstrated by the appearance, beginning at 2 days after infection, of intracellular covalently closed-circular and single-stranded DHBV DNA replicative intermediates which were not present in the inoculating virus preparation. With increasing time after infection there was further amplification of intracellular relaxed circular, covalently closed-circular, and single-stranded DHBV DNA. Cultures of primary duck hepatocytes are competent for infection with DHBV only during the first 4 days of culture. Synthesis of DHBV core antigen and DHBV surface antigen was detected by immunofluorescence in 10% of the hepatocytes in culture. De novo synthesis and release of infectious virus was also demonstrated. Therefore, all stages of viral replication were carried out by these experimentally infected primary hepatocyte cultures. This system makes it possible to study DHBV replication in vitro.
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Selected References
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