title: [A seroepidemiologic analysis of hepatitis B in Sichuan province].
abstract: OBJECTIVE
  To understand the changes of hepatitis B infection rates, before and after the hepatitis B vaccine was included into EPI, and to evaluate the effect of immunization which would lead to the development of a more appropriate hepatitis B control strategy.
  
  
  METHODS
  Seroepidemiologic method, with multi-section random sampling method were chosen. 14 sites from 8 counties were involved. 2-4 ml of the vein blood was drawn from all the individuals engaged in the study including 3806 samples. HBsAg, anti-HBs, anti-HBc of the samples were tested with ELISA.
  
  
  RESULTS
  Standardized positive rates of HBsAg and HBsAb were found as 7.05% and 29.77% respectively with the overall infection rate of HBV as 40.30%. The hepatitis B vaccine coverage of the children under 15 years was 70.73% and the positive rates for both HBsAg and anti-HBs were 2.62% and 56.68%, respectively. The coverage of hepatitis B vaccine among children under 3 years was 83.44% and the positive rates of both HBsAg and anti-HBs were 1.47% and 67.69% respectively, hepatitis B vaccine coverage of children under 3 years was 85.77%, with positive rates of HBsAg and anti-HBs as 1.78% and 75.44% respectively.
  
  
  CONCLUSIONS
  Results from our study revealed that since the introduction of hepatitis B vaccination, the prevalence rates of HBsAg and HBV infection had an obvious decline, especially in children aged under 15 years of old, suggesting that some changes had occurred in the epidemic characteristics of hepatitis B in Sichuan.
authors: Sichuan Province Center for Disease Control and Prevention, Chengdu 610041, China.
authors: Fei
authors: F
authors: Du
authors: Qing-lian
authors: QL
authors: Liu
authors: Qing-pei
authors: QP
authors: Fu
authors: Li
authors: L
authors: Sun
authors: Rui
authors: R
authors: Ao
authors: Xu-jing
authors: XJ
authors: Guan
authors: Yu
authors: Y
authors: Liu
authors: Jin
authors: J
authors: Wang
authors: Hui
authors: H
authors: He
authors: Wen-bin
authors: WB
authors: Tong
authors: Zhi-ying
authors: ZY
authors: Qin
authors: Wen-jing
authors: WJ
authors: Fan
authors: Jian
authors: J
authors: Li
authors: Ji-lan
authors: JL
authors: He
authors: Gang
authors: G
authors: Fang
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D006509:Hepatitis B / Q000453:epidemiology*; D006510:Hepatitis B Antibodies / Q000097:blood; D006514:Hepatitis B Surface Antigens / Q000097:blood; D017325:Hepatitis B Vaccines / Q000008:administration & dosage; D006801:Humans; D007223:Infant; D008875:Middle Aged; D015995:Prevalence; D012494:Sampling Studies; D016036:Seroepidemiologic Studies; D055815:Young Adult
chemical_list: D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens; D017325:Hepatitis B Vaccines