title: Effectiveness of a Chinese hamster ovary cell derived hepatitis B vaccine in Chinese rural communities.
abstract: OBJECTIVE
  To evaluate the effectiveness of a Chinese hamster ovary cell derived hepatitis B vaccine in a country community in Hebei Province, PR China.
  
  
  METHODS
  A cross-sectional investigation was carried out in 4 of 7 randomly selected country communities in Zhengding County in 2005. All of the children who were born between 1997 and 1999 were selected as study objects. Their serum samples were taken to test for HBV markers, and HBsAg prevalence was compared to that of the same age group before hepatitis B vaccination in 1983. In addition, for HBsAg positive children, their mothers were visited and tested for serum HBV markers, in order to distinguish maternal HBV transmissions.
  
  
  RESULTS
  Among the 2205 children of the selected birth cohort, 1696 (76.9%) were visited. The prevalence of HBsAg was 0.53%, and by comparing to that of before hepatitis B vaccination, the effectiveness was 95.3%, similar to that of yeast derived hepatitis B vaccines. Among 7 mothers of HBsAg positive children, 5 were HBsAg positive, indicating maternal HBV transmissions; and although one mother was HBsAg negative, her kid was not vaccinated, which indicates a horizontal transmission. As for the other kid, he was adopted and the HBV infection status of his birth mother was unknown.
  
  
  CONCLUSIONS
  The effectiveness of the CHO derived hepatitis B vaccine is comparable to yeast derived ones, and after the hepatitis B vaccination maternal transmission is the most important route of spreading HBV.
authors: Chinese Center for Disease Control and Prevention Institute for Viral Disease Control and Prevention, Beijing 100052, PR China.
authors: Yong
authors: Y
authors: Zhang
authors: Jing-Chen
authors: JC
authors: Ma
authors: Shun-Xiang
authors: SX
authors: Qi
authors: Feng
authors: F
authors: Wang
authors: Chong
authors: C
authors: Zhao
authors: Sheng-Li
authors: SL
authors: Bi
mesh_terms: D000818:Animals; D016466:CHO Cells; D002648:Child; D002681:China; D006224:Cricetinae; D003412:Cricetulus; D003430:Cross-Sectional Studies; D005260:Female; D006509:Hepatitis B / Q000453:epidemiology* / Q000276:immunology / Q000517:prevention & control*; D006514:Hepatitis B Surface Antigens / Q000097:blood; D017325:Hepatitis B Vaccines / Q000008:administration & dosage / Q000276:immunology*; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D012424:Rural Population; D016036:Seroepidemiologic Studies; D044967:Serum / Q000276:immunology; D014614:Vaccines, Synthetic / Q000008:administration & dosage / Q000276:immunology
chemical_list: D006514:Hepatitis B Surface Antigens; D017325:Hepatitis B Vaccines; D014614:Vaccines, Synthetic