If repeat Hep B surface antibody titer is non-reactive, a Hep B surface antigen test is required to rule out acute or chronic Hepatitis B infection. If Hep B surface antigen test is negative, student ...

Background: The duration of protection after hepatitis B vaccination of infants is unknown. Methods: We determined antibody to hepatitis B surface antigen (anti-HBs) at 4-13 years of age in 363 ...