Background a Hepatitis B virus(HBV) prevalence 8%0-High ● Infected:2 billion 2-7%0-Intermediater ● Chronically infected < 2%-Low 350-400 million> 8% - High 2-7% - Intermediate < 2% - Low  Hepatitis B virus (HBV）prevalence Background  Infected: 2 billion  Chronically infected: 350-400 million