title: Age-related hepatitis B seroconversion rates in health care workers.
abstract: BACKGROUND
  Protective hepatitis titers are reported for more than 90% of healthy adults who received three intradeltoid injections of vaccine. Some factors that influence seroconversion rates include age, sex, and presence of chronic diseases.
  
  
  METHODS
  Because of work-related factors that placed them at risk of acquiring hepatitis B, 112 employees, who ranged in age from 20 to 70 years with a mean age of 39.2 years, completed the hepatitis B vaccination series between 1986 and 1993. All participants received three vaccinations.
  
  
  RESULTS
  Hepatitis B surface antibody did not develop in 16 of 112 recipients (14.2%, 95% CI, 7.6% to 20.8%). Race, sex, and duration to antibody titer did not affect rates of seroconversion. Age greater than 50 years was associated with significantly decreased seroconversion rates (64.7%, 95% CI, 42.0% to 87.4%) compared with seroconversion rates of those younger than 50 years of age (89.5%, 95% CI 83.3% to 95.7%, p = 0.02).
  
  
  CONCLUSIONS
  Our results indicate that when a hepatitis B immunization program is implemented, seroconversion rates are lower than published rates for healthy adults and adolescents. We recommend that seroconversion data from immunization programs for employees at risk for hepatitis B be reviewed and that postimmunization testing be considered to ensure adequate protection for those employees at highest risk for nonconversion.
authors.affiliation: Department of Medicine, College of Human Medicine, Michigan State University, E. Lansing 48824, USA.
authors.forename: D
authors.initials: D
authors.lastname: Havlichek
authors.forename: K
authors.initials: K
authors.lastname: Rosenman
authors.forename: M
authors.initials: M
authors.lastname: Simms
authors.forename: P
authors.initials: P
authors.lastname: Guss
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006282:Health Personnel; D006509:Hepatitis B / Q000276:immunology* / Q000517:prevention & control*; D006510:Hepatitis B Antibodies / Q000097:blood*; D006514:Hepatitis B Surface Antigens / Q000097:blood; D017325:Hepatitis B Vaccines / Q000008:administration & dosage*; D006801:Humans; D017589:Immunization Programs; D008297:Male; D008824:Michigan; D008875:Middle Aged; D009784:Occupational Diseases / Q000517:prevention & control*; D016036:Seroepidemiologic Studies; D012698:Serologic Tests; D014481:United States; D014489:United States Occupational Safety and Health Administration
chemical_list: D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens; D017325:Hepatitis B Vaccines