Hepatitis B virus (HBV) infection is the most common cause of liver disease in endemic areas such as South Korea. After HBV vaccination, hepatitis B surface antibody (HBsAb) titers gradually decrease. Trends in HBsAb titers have not been evaluated among children in South Korea over the past decade. | Changes in hepatitis B virus antibody titers over time among children: A single center study from 2012 to 2015 in an urban of South Korea