Long-term efficacy of 10-12 years after being immunized with Chinese hamster ovary cell derived hepatitis B vaccine in Chinese Rural Communities.

Objective: To evaluate the long-term efficacy of Chinese hamster ovary (CHO) cell derived hepatitis B vaccine in country community in China.
Methods: A cross-sectional investigation was carried out. Children who were born between 1997 and 1999 and vaccinated with the three doses of CHO-derived hepatitis B vaccine were selected as study objects. Their serum samples were taken to test for hepatitis B virus (HBV) markers, and the results were compared to that before vaccination. In addition, for HBsAg positive children, their mothers were visited.
Results: 1254 Children were enrolled in the study. The prevalence of HBsAg was 0.24% and the vaccine efficacy was 97.0%, similar to that of yeast derived hepatitis vaccines. Among 3 mothers of HBsAg positive children, 2 were HBsAg positive, indicating maternal HBV transmissions.
Conclusion: The long-term efficacy of the CHO-derived hepatitis B vaccine is good and after vaccination maternal transmission is the most important route of spreading HBV.
(Copyright © 2012 Elsevier Ltd. All rights reserved.)