HBsAg was negative in all donors. Forty-nine donors were HBsAb positive and HBcAb positive, suggestive of prior exposure to HBV, whereas 15 were HBsAb positive only, indicative of prior vaccination.

HBcAb = hepatitis B core antibody; HCV = hepatitis C virus; HGV = hepatitis G virus; NS = not significant; SD = standard deviation; TTV = TT virus. *The data are the number of positive samples ...