Fig. 2From: The current incidence, prevalence, and residual risk of hepatitis B viral infections among voluntary blood donors in ChinaTesting Algorithm. Note: §: We do not take into account the risk from OBI. HBsAg: Hepatitis B surface Antigen. HBc antibody: Hepatitis B core antibody. ELISA: Enzyme-Linked Immuno Sorbent Assay. IBT: Institute of Blood Transfusion. S/CO: the signal to cutoff ratioBack to article page