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. 1985 Jul;55(1):16–22. doi: 10.1128/jvi.55.1.16-22.1985

Sequence of events in natural infection of Pekin duck embryos with duck hepatitis B virus.

M K Urban, A P O'Connell, W T London
PMCID: PMC254892  PMID: 4009791

Abstract

The major mode of natural infection of duck hepatitis B virus (DHBV) in Pekin ducks is vertical transmission, with 95 to 100% of the embryos from DHBV-infected dams eventually becoming infected. Maternally transmitted virus is present in large quantities in the yolk of unincubated eggs and is taken up by the embryo during early development. Synthesis of DHBV DNA in the embryo begins at about 6 days of incubation and coincides with the formation of the liver. DHBV DNA synthesis is incomplete, however, until 8 to 10 days of incubation, as shown by comparing the electrophoretic patterns of DHBV-specific nucleic acid species from embryonic livers at successive stages of development. From 8 days of incubation and continuing throughout embryonic development, subviral particles, which resemble viral replication intermediates isolated from infected livers of post-hatch ducklings, appear in the circulation. These particles contain a polymerase activity that utilizes an RNA template to synthesize viral DNA. Our results suggest that certain host functions, which appear during embryonic development, may be required for DHBV replication and assembly. It is possible that in mammals a similar developmental process occurs. The failure to find human hepatitis B virus in the circulation of most babies, born to hepatitis B virus carrier women, in the first few weeks after birth may reflect such a process.

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