title: [Intrauterine HBV infection: risk factors and impact of HBV DNA].
abstract: OBJECTIVE
  To investigate the risk factors of intrauterine hepatitis B virus (HBV) infection and the impact of HBV DNA on the infection.
  
  
  METHODS
  The serum levels of HBsAg, HbsAb, HBeAg, HBeAb, HBcAb and HBV DNA were determined in blood samples from 230 HBsAg-positive pregnant women and their newborns by enzyme-linked immunosorbent assay (ELISA) and fluorescence quantitative PCR (FQ-PCR), respectively. The newborns acquiring HBV infection via intrauterine transmission were selected as the case group and others as the control group. The risk factors for intrauterine HBV infection were analyzed by non-conditional logistic regression model.
  
  
  RESULTS
  Six infants were found to be HBsAg-positive, and 18 HBV DNA-positive, and 3 of them were positive for both HBsAg and HBV DNA. The rate of intrauterine HBV infection was 9.6% (22/230). The grade of HBV DNA level was identified as the only risk factor of intrauterine HBV infection by non-conditional logistic regression model, with odds ratio (OR) of 1.57 (95% confidence interval 1.12-2.21). Of the 119 pregnant women positive for HBV DNA, 18 were diagnosed as having intrauterine HBV infection, and the likeliness of the infection significantly increased for a maternal serum HBV DNA level > or =10(7) copies/ml (chi(2)=7.92, P<0.05).
  
  
  CONCLUSIONS
  The grade of serum HBV DNA level is the predominant risk factor for intrauterine HBV infection in pregnant women, and for those with serum HBV DNA lever > or =10(7) copies/ml, the chance for intrauterine HBV infection can be significantly increased.
authors.affiliation: Department of Obstetrics and Gynecology, Third Affiliated Hospital, Sun Yat-sen University, Guangzhou 510630, China.
authors.forename: Yu-zhu
authors.initials: YZ
authors.lastname: Yin
authors.forename: Xiao-wei
authors.initials: XW
authors.lastname: Chen
authors.forename: Xiao-mao
authors.initials: XM
authors.lastname: Li
authors.forename: Hong-ying
authors.initials: HY
authors.lastname: Hou
authors.forename: Zhong-jie
authors.initials: ZJ
authors.lastname: Shi
mesh_terms: D004279:DNA, Viral / Q000097:blood* / Q000235:genetics; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006509:Hepatitis B / Q000635:transmission* / Q000821:virology; D006510:Hepatitis B Antibodies / Q000097:blood; D006514:Hepatitis B Surface Antigens / Q000097:blood; D006515:Hepatitis B virus / Q000235:genetics / Q000276:immunology; D006801:Humans; D007231:Infant, Newborn; D018445:Infectious Disease Transmission, Vertical; D016015:Logistic Models; D016017:Odds Ratio; D016133:Polymerase Chain Reaction; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000097:blood / Q000821:virology*; D012307:Risk Factors
chemical_list: D004279:DNA, Viral; D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens