1 Investigative presumption
The mechanism of chronic hepatitis B is concerned with immunologic inadequacy, forexample, the hyporesponsiveness of T lymphocyte subset, the lower of NK activity and thelower level of Th1 cytokine, virus content of high titer in vivo and the immune tolerance ofinfected cell. Now antiviral drug to eradicate HBV has not been found yet, and the immunetolerance of HBV exactly existing on which reaction link or committed step has not beenidentified. Chinese crude dr...