[Screening of antiviral agents from medicinal herbs by means of Hepadnaviruses models].

The antiviral study of 21 Chinese medicinal herbs was carried out in vitro and in vivo. The extracts of phyllanthus urinarin and polygonum cuspidatum exhibite obvious effects on duck hepatitis B virus and human hepatitis B virus, while the extract of Eclipta alba showed limited inhibition on HBV DAN polymerase.