Hepatitis b virus HBV is a kind of hepadnavirus Three particles in serum two types of non-infectious particles spherical particles and filamentous forms, composed of Surface antigen(HBsag) Dane particle: infectious particles °10 genotypesHepatitis B virus • HBV is a kind of hepadnavirus • Three particles in serum: two types of non-infectious particles: spherical particles and filamentous forms, composed of Surface antigen (HBsAg) Dane particle: infectious particles • 10 genotypes 6