title: Seroepidemiology of HBV infection in South Korea, 1995 through 1999.
abstract: BACKGROUND
  We analyzed serologic data that were obtained from the Korea Association of Health from 1995 to 1999 to estimate the reliable prevalence of HBV in South Korea.
  
  
  METHODS
  603,375, 639,465, 621,476, 612,705 and 650,398 serum samples were annually tested for HBsAg. Of HBsAg positive persons whose serum samples were available, HBeAg positivity was checked.
  
  
  RESULTS
  HBsAg positivities among subjects between 6 and 19 years old were 8.2%, 3.9%, 2.1%, 2.6% and 1.3%. HBsAg positivities among subjects above 20 years old were 8.9%, 6.4%, 5.9%, 5.4% and 5.4%. The positive rates of HBeAg were 39.8 to 62.9% among subjects between 6 and 19 years old, and 18.3 to 37.9% among persons above 20 years old, in each year. In both subgroups, HBsAg positivity in the latter year was significantly lower than that in the former year (p < 0.001). It also showed that HBsAg positivities among subjects between 6 and 19 years old have been significantly lower than those among subjects above 20 years old, but those of HBeAg the exact reverse of HBsAg since 1996 (p < 0.001).
  
  
  CONCLUSIONS
  It was observed that prevalence of HBV infection in the late 1990s, especially in the group between 6 and 19 years old, was conspicuously lower than that in the past. The nationwide vaccination programme might be one of the most important contributors to this tendency in Korea.
authors.affiliation: Kangwon Branch, Korea Association of Health, Gastoenterology and Hepatology, Department of Internal Medicine, Hallym University Medical Center, Seoul, ROK.
authors.forename: M K
authors.initials: MK
authors.lastname: Jang
authors.forename: J Y
authors.initials: JY
authors.lastname: Lee
authors.forename: J H
authors.initials: JH
authors.lastname: Lee
authors.forename: Y B
authors.initials: YB
authors.lastname: Kim
authors.forename: H Y
authors.initials: HY
authors.lastname: Kim
authors.forename: M S
authors.initials: MS
authors.lastname: Lee
authors.forename: C K
authors.initials: CK
authors.lastname: Park
authors.forename: J Y
authors.initials: JY
authors.lastname: Yoo
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D002648:Child; D005260:Female; D006306:Health Surveys; D006509:Hepatitis B / Q000097:blood / Q000175:diagnosis* / Q000453:epidemiology*; D006514:Hepatitis B Surface Antigens / Q000032:analysis*; D006515:Hepatitis B virus / Q000302:isolation & purification*; D019694:Hepatitis B, Chronic / Q000097:blood / Q000175:diagnosis / Q000453:epidemiology; D006801:Humans; D007723:Korea / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012307:Risk Factors; D012698:Serologic Tests / Q000379:methods; D017678:Sex Distribution
chemical_list: D006514:Hepatitis B Surface Antigens