title: Hepatitis A Vaccination Rates and Related Factors in a 2005 Population-based Study in Nonsan, Korea.
abstract: OBJECTIVE
  The incidence of clinical hepatitis A has increased in young Korean adults since the mid-1990s. Although hepatitis A vaccinations have been administered in private clinics over the past 10 yr, no data exist on the vaccination rate and relating factors.
  
  
  METHODS
  In 2005, a population-based survey of 12-35-month-old children was carried out in Nonsan, Korea. An interview survey was completed for 71.3% of the children. All data came from a vaccination card or confirmation from a provider.
  
  
  RESULTS
  The hepatitis A vaccination rate was 42.3% for ≥1 dose and 24.7% for 2-dose. The results of the multivariate regression analysis for the hepatitis A vaccination showed that the second (OR=1.6) and third and successive children (OR=3.3) were less often immunized than the first child. Low economic status (OR=1.6), rural area (OR=1.5) and employed mother (OR=1.5) were also correlated with a lower vaccination rate. The hepatitis A vaccination rate was significantly lower in children who had no other vaccinations: measlesmumps-rubella (OR=2.8 for ≥1 dose and 7.3 for 2-dose), varicella (OR=20.2 and 22.0, respectively) and Haemophilus influenza type b (OR=14.3 and 13.3, respectively).
  
  
  CONCLUSIONS
  To prevent outbreaks of clinical hepatitis A by enough herd immunity, a vaccination should be included in the National Immunization Program and a vaccination policy developed and implemented that can overcome the barriers to immunization such as late birth order and a mother's employment.
authors.affiliation: Department of Preventive Medicine, School of Medicine, Konyang University, Daejeon, Korea.
authors.forename: Eun Young
authors.initials: EY
authors.lastname: Kim
authors.forename: Baeg Ju
authors.initials: BJ
authors.lastname: Na
authors.forename: Moo Sik
authors.initials: MS
authors.lastname: Lee
authors.forename: Keon Yeop
authors.initials: KY
authors.lastname: Kim
authors.forename: Moran
authors.initials: M
authors.lastname: Ki