The family Hepadnaviridae comprises small enveloped viruses with a partially double-stranded DNA genome of 3.0–3.4 kb. All family members express three sets of proteins (preC/C, polymerase and preS/S) and replication involves reverse transcription within nucleocapsids in the cytoplasm of hepatocytes. Hepadnaviruses are hepatotropic and infections may be transient or persistent. There are five genera: Parahepadnavirus, Metahepadnavirus, Herpetohepadnavirus, Avihepadnavirus and Orthohepadnavirus. This is a summary of the International Committee on Taxonomy of Viruses (ICTV) Report on the family Hepadnaviridae, which is available at ictv.global/report/hepadnaviridae.

中文翻译：

---

ICTV病毒分类标准简介：Hepadnaviridae。

嗜肝DNA病毒科由小包膜病毒组成，部分双链DNA基因组为3.0–3.4 kb。所有家族成员均表达三组蛋白质（preC / C，聚合酶和preS / S），复制涉及肝细胞质中核衣壳内的逆转录。肝炎病毒是肝细胞性的，感染可能是短暂的或持续的。有五个属：Parahepadnavirus，Metahepadnavirus，Herpetohepadnavirus，禽肝病毒属和正肝去氧核糖核酸病毒属。这是国际病毒分类委员会（ICTV）关于嗜肝病毒科的报告的摘要，该报告可在ictv.global/report/hepadnaviridae中获得。