[Dynamic study on the anti-HBs level of immunized children born to HBsAg-positive and HBsAg-negative mothers in hyperendemic area of hepatitis B].

Objective: To investigate the dynamic changes of the anti-HBs level among immunized newborn infants born to HBsAg-positive and HBsAg-negative mothers in hyper-endemic area of Hepatitis B.

Methods: Infants who were regularly vaccinated with Hepatitis B vaccine and tested to be anti-HBs positive were divided into two groups according to HBsAg-positive or negative mothers in Long-an, Guangxi. Each subject was followed up 3 times during age 5 to 8.

[Efficacy of hepatitis B vaccination on hepatitis B prevention and on hepatocellular carcinoma].

Objective: To evaluate the efficacy of hepatitis B vaccination on hepatitis B prevention and on hepatocellular carcinoma.

Methods: Birth cohort study, cross-sectional seroepidemiological survey, and surveillance of hepatitis B (HBV) and hepatocellular carcinoma were used to evaluate the efficacy of hepatitis B vaccination.

Results: During the 14 years after hepatitis B vaccination, the HBsAg positive rates were found to be 0.