title: High rate of infectivity and liver disease in blood donors with antibodies to hepatitis C virus.
abstract: OBJECTIVE
  To determine the epidemiologic, clinical, serologic, and histologic importance of antibodies to hepatitis C virus (anti-HCV) in blood donors.
  
  
  METHODS
  Cross-sectional identification and prospective evaluation of seropositive donors; retrospective assessment of infectivity; and nested case-control study for risk factors.
  
  
  METHODS
  Liver unit of a referral-based university hospital.
  
  
  METHODS
  Of 30,231 consecutive donors, 368 (1.2%) were found to be anti-HCV-reactive by enzyme-linked immunosorbent assay (ELISA). Two hundred and fifty-four of these 368 donors were evaluated for risk factors by comparison with 284 age- and sex-matched controls. Eighty-six spouses of seropositive donors were also evaluated.
  
  
  RESULTS
  Twenty-four percent of the seropositive donors had a history of percutaneous exposure to blood. This rate increased to 45% when only those donors confirmed to be anti-HCV positive by a second-generation recombinant immunoblot assay (RIBA-2) were considered. A family history of liver disease (odds ratio, 2.8; 95% Cl, 1.6 to 4.8), previous blood transfusion (odds ratio, 6.1; 95% Cl, 3 to 12.5), and a history of tattooing or intravenous drug abuse (odds ratio, 8.4; 95% Cl, 2.3 to 31) were associated with anti-HCV seropositivity. An elevated alanine aminotransferase (ALT) level was found in 58% of the seropositive donors. Of the 150 donors tested, 104 (69%; Cl, 62% to 77%) were confirmed by RIBA-2 to be anti-HCV positive. Of the 105 donors who had a biopsy, 16% had normal histologic findings, 11% had minimal changes, 21% had chronic persistent hepatitis, 45% had chronic active hepatitis, and 7% had active cirrhosis. All 77 donors with RIBA-2-confirmed seropositivity had histologic abnormalities. Of 43 donors evaluated in an infectivity study, 82% were implicated in previous HCV transmission. Only 2.3% of the spouses were anti-HCV positive. The ELISA, RIBA-2, and ALT results correlated with infectivity and abnormal histologic findings.
  
  
  CONCLUSIONS
  In our geographic area, almost 70% of donors who are anti-HCV positive by ELISA are confirmed to be positive by RIBA-2; most of these donors appear to be chronic carriers of HCV and have substantial liver disease.
authors.affiliation: Liver Unit, Hospital General Universitari Vall d'Hebrón, Barcelona, Spain.
authors.forename: J I
authors.initials: JI
authors.lastname: Esteban
authors.forename: J C
authors.initials: JC
authors.lastname: López-Talavera
authors.forename: J
authors.initials: J
authors.lastname: Genescà
authors.forename: P
authors.initials: P
authors.lastname: Madoz
authors.forename: L
authors.initials: L
authors.lastname: Viladomiu
authors.forename: E
authors.initials: E
authors.lastname: Muñiz
authors.forename: C
authors.initials: C
authors.lastname: Martin-Vega
authors.forename: M
authors.initials: M
authors.lastname: Rosell
authors.forename: H
authors.initials: H
authors.lastname: Allende
authors.forename: X
authors.initials: X
authors.lastname: Vidal
mesh_terms: D000293:Adolescent; D000328:Adult; D001782:Blood Donors / Q000706:statistics & numerical data*; D002353:Carrier State / Q000453:epidemiology; D015331:Cohort Studies; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D016174:Hepacivirus / Q000276:immunology*; D006508:Hepatitis Antibodies / Q000097:blood*; D006526:Hepatitis C / Q000453:epidemiology / Q000473:pathology / Q000635:transmission*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D016036:Seroepidemiologic Studies; D013030:Spain / Q000453:epidemiology
chemical_list: D006508:Hepatitis Antibodies