frozen serial serum specimens obtained from past studies on the natural history and prevention of type b hepatitis in children were retested by radioimmunoassay for the following markers of hepatitis b infection : hepatitis b surface antigen ( hbsag ) and antibody ( anti-hbs ) , hepatitis b e antigen ( hbeag ) and antibody ( anti-hbe ) , and antibody to hepatitis b core antigen ( anti-hbc ) .
C0019163
hepatitis b infection
C0019168
hepatitis b surface antigen