title: Risk factors for hepatitis C virus infection in blood donors: a case-control study.
abstract: OBJECTIVE
  To investigate risk factors for hepatitis C virus (HCV) infection in Sydney blood donors.
  
  
  METHODS
  Blood donors confirmed to be positive for HCV antibodies were compared with blood donors with a positive result of a screening assay, but whose HCV antibody status had not been confirmed. A questionnaire on sexual, parenteral and other potential risk factors was administered to both groups.
  
  
  METHODS
  Blood Transfusion Service in Sydney.
  
  
  METHODS
  The study enrolled 220 donors who had confirmed HCV infection, and 210 donors who did not.
  
  
  RESULTS
  The relative risk associated with injecting drug use was 63 (95% confidence interval, 19-260) when comparison was made with all other donors. Among donors who did not report injecting drug use, a significant, independent increase in risk was found in association with having had a tattoo. Among donors who did not give a history of parenteral exposure, there was a significantly greater risk in people with more than one life-time sexual partner than in those with at most one partner.
  
  
  CONCLUSIONS
  A history of injecting drug use was elicited as the most important risk factor in Sydney blood donors with antibodies to hepatitis C. Having had a tattoo, and an increased number of lifetime sexual partners were also independently associated with HCV infection.
mesh_terms: D000328:Adult; D001782:Blood Donors / Q000706:statistics & numerical data*; D001803:Blood Transfusion; D016022:Case-Control Studies; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D016174:Hepacivirus / Q000276:immunology; D006508:Hepatitis Antibodies / Q000032:analysis; D006526:Hepatitis C / Q000209:etiology*; D018937:Hepatitis C Antibodies; D006801:Humans; D008297:Male; D009517:New South Wales; D012307:Risk Factors; D012747:Sexual Partners; D015819:Substance Abuse, Intravenous / Q000150:complications; D011795:Surveys and Questionnaires; D013653:Tattooing
chemical_list: D006508:Hepatitis Antibodies; D018937:Hepatitis C Antibodies