title: High prevalence of autoantibodies in hepatitis A infection: the impact on laboratory profiles.
abstract: OBJECTIVE
  In the absence of IgM antibodies against hepatitis A virus (HAV), HAV infections can be regarded as autoimmune hepatitis when they show positive autoantibodies by indirect immunofluorescence and lack other viral markers. The aim of this study was to evaluate the prevalence, titres and impact of autoantibodies in Korean patients with HAV infection.
  
  
  METHODS
  The study involved a retrospective review of the electronic medical records of 73 patients with HAV at Konkuk University Hospital from August 2005 to September 2008. The presence and pattern of anti-nuclear antibody, anti-smooth muscle antibody, anti-mitochondrial antibody and anti-liver/kidney microsomal antibody were assessed by indirect immunofluorescence on Hep-2 cells and mouse/kidney sections.
  
  
  RESULTS
  Of the 73 patients with hepatitis A, 65 (89.0%) showed positive indirect immunofluorescence tests. Of note, most of the positive tests (95.5%) showed a cytoplasmic pattern with filamentous staining of cytoplasmic fibres. There was no significant difference between groups in age or sex. In patients positive for autoantibodies, alanine aminotransferase and leucocyte count were significantly higher, while the increase in globulin was not statistically significant. In terms of titres, globulin was significantly higher in patients with > or =1:160 titres than in those with < or =1:80 titres (mean (SD) 3.4 (0.5) versus 2.8 (0.4) g/dl, respectively; p = 0.000).
  
  
  CONCLUSIONS
  The study demonstrated a high prevalence of anticytoplasmic autoantibodies in patients with acute hepatitis A. These data would be useful to aid interpretation of indirect immunofluorescence testing in patients with acute hepatitis, especially in areas with a high prevalence of HAV.
authors.affiliation: Department of Laboratory Medicine, Konkuk University School of Medicine, Seoul, South Korea. hannasis@hanmail.net
authors.forename: H W
authors.initials: HW
authors.lastname: Moon
authors.forename: J K
authors.initials: JK
authors.lastname: Noh
authors.forename: M
authors.initials: M
authors.lastname: Hur
authors.forename: Y M
authors.initials: YM
authors.lastname: Yun
authors.forename: C H
authors.initials: CH
authors.lastname: Lee
authors.forename: S Y
authors.initials: SY
authors.lastname: Kwon
mesh_terms: D000293:Adolescent; D000328:Adult; D001323:Autoantibodies / Q000097:blood*; D002648:Child; D003593:Cytoplasm / Q000276:immunology; D005260:Female; D019084:Fluorescent Antibody Technique, Indirect / Q000379:methods; D006506:Hepatitis A / Q000276:immunology*; D035922:Hepatitis A Antibodies / Q000097:blood; D030041:Hepatitis A virus / Q000276:immunology; D006801:Humans; D007075:Immunoglobulin M / Q000097:blood; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D055815:Young Adult
chemical_list: D001323:Autoantibodies; D035922:Hepatitis A Antibodies; D007075:Immunoglobulin M