the prevalence rate of surface antibody ( anti-hbs ) , core antibody ( anti-hbc ) , and seropositivity ( at least one marker of hepatitis b detectable ) were 39.0 , 30.5 , and 52.5 % , respectively , in infancy , then decreased to 10.7 , 14.3 , and 17.9 % , respectively , between 1 and 2 years of age .
C0034789
surface antibody
C0003241
antibody