title: Quantitative assessment of hepatitis C virus RNA and IgM antibodies to hepatitis C core in chronic hepatitis C.
abstract: OBJECTIVE
  IgM antibodies to hepatitis C virus have been found in a variable proportion of patients with chronic hepatitis C. We have evaluated whether IgM anti-core antibodies correlate with viraemia or hepatic injury in chronic hepatitis C.
  
  
  METHODS
  Serum from 106 patients with chronic hepatitis C with varying stages of disease were tested for IgM anti-core hepatitis C virus by immunoassay. All patients were seropositive for IgG antibody to hepatitis C virus by second-generation ELISA; 25 had histologic cirrhosis and 57 chronic hepatitis. IgM anti-core was detected in 84/106 (79.2%) patients. HCV-RNA was tested by branched (bDNA) signal amplification assay or by polymerase chain reaction in 92 patients.
  
  
  RESULTS
  All IgM-anti-HCV positive patients had detectable HCV-RNA. Seventy of 87 (80.5%) HCV-RNA-positive patients were IgM anti-core positive. Levels of IgM anti-HCV were significantly higher in patients with HCV-RNA detected by bDNA than in those who were bDNA negative, but there was no correlation between HCV-RNA concentrations and IgM anti-HCV levels. Of the 84 patients with positive results for IgM anti-core hepatitis C virus, 59 (70.2%) had abnormal alanine aminotransferase levels. The levels of IgM anti-core hepatitis C virus were likewise significantly higher in those with abnormal alanine aminotransferase levels. There was no difference in the percentage of patients with a positive IgM anti-HCV, or in levels of IgM anti-core hepatitis C virus in those with chronic hepatitis versus cirrhosis.
  
  
  CONCLUSIONS
  These data suggest that the majority of patients with chronic hepatitis C virus infection are IgM anti-core hepatitis C virus positive, and the detection seems to be associated with viral replication and biochemical evidence of hepatic necrosis. IgM anti-core hepatitis testing may prove useful as an adjunct in the clinical assessment of patients with chronic hepatitis C.
authors.affiliation: University Department of Medicine, Royal Free Hospital and School of Medicine, London, United Kingdom.
authors.forename: A L
authors.initials: AL
authors.lastname: Martinelli
authors.forename: D
authors.initials: D
authors.lastname: Brown
authors.forename: H B
authors.initials: HB
authors.lastname: Braun
authors.forename: G
authors.initials: G
authors.lastname: Michel
authors.forename: G M
authors.initials: GM
authors.lastname: Dusheiko
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000410:Alanine Transaminase / Q000097:blood; D002908:Chronic Disease; D005260:Female; D016174:Hepacivirus / Q000235:genetics / Q000276:immunology; D006526:Hepatitis C / Q000209:etiology / Q000276:immunology* / Q000821:virology; D018937:Hepatitis C Antibodies / Q000097:blood*; D006801:Humans; D007075:Immunoglobulin M / Q000097:blood*; D008297:Male; D008875:Middle Aged; D012367:RNA, Viral / Q000097:blood*; D012307:Risk Factors; D014758:Viral Core Proteins / Q000276:immunology*
chemical_list: D018937:Hepatitis C Antibodies; D007075:Immunoglobulin M; D012367:RNA, Viral; D014758:Viral Core Proteins; C069130:nucleocapsid protein, Hepatitis C virus; D000410:Alanine Transaminase