title: Differential diagnosis of hepatitis E virus, cytomegalovirus and Epstein-Barr virus infection in patients with suspected hepatitis E.
abstract: BACKGROUND
  The accuracy of the diagnosis of hepatitis E in the clinical setting relies mainly on the performance of assays for hepatitis E virus (HEV)-specific IgM (anti-HEV IgM) testing in serum.
  
  
  OBJECTIVE
  Identification of factors influencing the specificity of the results obtained with these assays is an important issue in regard to the accuracy of the diagnosis.
  
  
  METHODS
  Anti-HEV IgM and HEV RNA were studied in samples from 153 patients with acute hepatitis of unknown aetiology received during a two-year period. Fifteen patients were positive for anti-HEV IgM, and eight of them were also positive for HEV RNA. Investigation of CMV and Epstein-Barr virus (EBV) infection markers among the remaining seven patients, and of HEV infection markers among 18 patients with infectious mononucleosis, was performed.
  
  
  RESULTS
  The results obtained showed that acute infection by CMV or EBV may cause false reactivity for anti-HEV IgM, likely because of polyclonal B-cell stimulation.
  
  
  CONCLUSIONS
  Since infection by these herpesviruses may produce acute hepatitis, such event can cause diagnostic mistakes and should be investigated in patients positive for anti-HEV IgM and negative for HEV RNA.
authors.affiliation: Service of Diagnostic Microbiology, National Centre of Microbiology, Instituto de Salud Carlos III, Madrid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Fogeda
authors.forename: F
authors.initials: F
authors.lastname: de Ory
authors.forename: A
authors.initials: A
authors.lastname: Avellón
authors.forename: J M
authors.initials: JM
authors.lastname: Echevarría
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D003586:Cytomegalovirus Infections / Q000175:diagnosis*; D003937:Diagnosis, Differential; D020031:Epstein-Barr Virus Infections / Q000175:diagnosis*; D005189:False Positive Reactions; D005260:Female; D006508:Hepatitis Antibodies / Q000097:blood; D016751:Hepatitis E / Q000175:diagnosis*; D016752:Hepatitis E virus / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification; D006801:Humans; D007075:Immunoglobulin M / Q000097:blood; D007223:Infant; D007231:Infant, Newborn; D008875:Middle Aged; D011247:Pregnancy; D012367:RNA, Viral / Q000097:blood; D055815:Young Adult
chemical_list: D006508:Hepatitis Antibodies; D007075:Immunoglobulin M; D012367:RNA, Viral