title: Prevalence of antibody to hepatitis C virus in HBsAg-negative chronic liver disease in Hong Kong using different assays.
abstract: The prevalence of anti-HCV antibodies in Chinese patients with HBsAg-negative chronic liver diseases was studied retrospectively. Anti-HCV was detected by two different ELISAs. In 97 patients with HBsAg-negative chronic liver disease, 26 (27%) were anti-HCV positive. Of 157 control subjects, only 1 (0.6%) was anti-HCV positive (P less than 0.001). Anti-HCV was detected in 18 of 27 (67%) patients with post-transfusion non-A, non-B (PTNANB) chronic hepatitis or cirrhosis, 5 of 25 (20%) patients with cryptogenic chronic hepatitis or cirrhosis, 2 of 33 (6%) patients with alcoholic liver disease, 1 of 5 (20%) patients with autoimmune chronic active hepatitis (AICAH), none of 4 patients with primary biliary cirrhosis (PBC), and none of 3 patients with fatty liver. The prevalence in this group of patients was lower when compared to reports from other countries. The addition of a urea washing step reduced false-positivity in alcoholic and AICAH groups. The ELISA that employs three recombinant HCV antigens confirmed all positive results by another ELISA with the exception of one weakly positive result in the AICAH group and one in the alcoholic group. One patient in the PTNANB group was detected in addition by the second generation assay. In conclusion, ELISA with a urea wash proved to be useful in reducing false-positivity, and the second generation assay proved to be a sensitive and specific test for anti-HCV antibody.
authors.affiliation: Department of Medicine, Faculty of Medicine, Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, NT.
authors.forename: J Y
authors.initials: JY
authors.lastname: Lai
authors.forename: J S
authors.initials: JS
authors.lastname: Tam
authors.forename: L Y
authors.initials: LY
authors.lastname: Lam
authors.forename: N W
authors.initials: NW
authors.lastname: Leung
mesh_terms: D000328:Adult; D000368:Aged; D000914:Antibodies, Viral / Q000097:blood*; D002908:Chronic Disease; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D016174:Hepacivirus / Q000276:immunology*; D006514:Hepatitis B Surface Antigens / Q000097:blood; D006723:Hong Kong; D006801:Humans; D008107:Liver Diseases / Q000382:microbiology*; D008297:Male; D008875:Middle Aged
chemical_list: D000914:Antibodies, Viral; D006514:Hepatitis B Surface Antigens