title: Prevalence and incidence of viral hepatitis in health workers in the prehepatitis B vaccination era.
abstract: To assess the impact of hepatitis B virus on health workers, the authors studied baseline prevalences of hepatitis B serologic markers and undertook prospective surveillance to assess hepatitis B attack rates in 837 health workers and 994 blood-donor controls between 1977 and 1982, before the introduction of hepatitis B vaccine. The baseline prevalence of all hepatitis B markers was 14% in health workers and 6% in controls (p < 0.001); exposure to hepatitis B virus was related to the intensity of blood exposure and its duration. In contrast, the frequency of exposure to hepatitis A virus, a nonblood-borne agent, was lower in health workers (11%) than in controls (16%) (p < 0.01) and increased as a function of age. Multivariate logistic regression analysis identified occupational categories with frequent blood contact, rather than duration of exposure, as being the dominant variable for exposure to hepatitis B virus; for hepatitis A virus exposure, age was the most significant variable. Among health workers susceptible to hepatitis B, the incidence of new definite hepatitis B infections was 1.0% per year in 362 health workers (804 person-years of follow-up observation) with frequent blood contact versus 0% per year in 258 health workers (534 person-years of observation) with limited blood contact (p = 0.017). For definite plus probable cases combined, the incidence of new hepatitis B infections was 1.5% per year versus 0.2% per year for the groups with frequent and limited blood exposures, respectively (p = 0.0013). There were no new cases of hepatitis A or B or seroconversions in controls and only one case of hepatitis A acquired outside the hospital by a health worker. These data confirm the high prevalence of hepatitis B exposure and document in a prospective study the high incidence over time of new hepatitis B virus infections in health workers unprotected by vaccination. Such findings reiterate the need for aggressive vaccination programs in health workers exposed to blood.
authors.affiliation: Gastrointestinal Unit (Medical Services), Massachusetts General Hospital, Boston 02114.
authors.forename: A
authors.initials: A
authors.lastname: Gibas
authors.forename: D R
authors.initials: DR
authors.lastname: Blewett
authors.forename: D A
authors.initials: DA
authors.lastname: Schoenfeld
authors.forename: J L
authors.initials: JL
authors.lastname: Dienstag
mesh_terms: D035922:Hepatitis A Antibodies; D006508:Hepatitis Antibodies / Q000097:blood; D006509:Hepatitis B / Q000097:blood / Q000453:epidemiology*; D006512:Hepatitis B Core Antigens / Q000097:blood; D006514:Hepatitis B Surface Antigens / Q000097:blood; D006769:Hospitals, General; D006801:Humans; D015994:Incidence; D016015:Logistic Models; D008404:Massachusetts / Q000453:epidemiology; D010564:Personnel, Hospital / Q000706:statistics & numerical data*; D011159:Population Surveillance; D015995:Prevalence; D011446:Prospective Studies; D012307:Risk Factors; D016036:Seroepidemiologic Studies
chemical_list: D035922:Hepatitis A Antibodies; D006508:Hepatitis Antibodies; D006512:Hepatitis B Core Antigens; D006514:Hepatitis B Surface Antigens