title: Human herpesvirus-6 infection in liver transplant recipients: documentation of pathogenicity.
abstract: BACKGROUND
  The new herpesvirus, human herpesvirus-6 (HHV-6), is able to cause clinical illness after transplantation; however, the pathogenic potential and the clinical features of HHV-6 have not been defined in liver transplant recipients.
  
  
  METHODS
  We report the first cases of invasive and symptomatic infection due to HHV-6 in liver transplant recipients.
  
  
  RESULTS
  HHV-6 infection occurred in four liver transplant recipients at a median of 50 days after transplant (range 17-90 days). Severe cytopenia was observed in all patients; leukopenia (with median leukocyte count of 1400/mm3) was the most commonly effected bone marrow lineage. One of the four patients had interstitial pneumonitis due to HHV-6. No other virus (e.g., cytomegalovirus) or another pathogen was detected in the lungs, blood, or bone marrow in any of the above patients.
  
  
  CONCLUSIONS
  Our data suggest that HHV-6 can be a pathogen in liver transplant recipients; idiopathic bone marrow suppression is its predominant clinical sequelae. Recognition of HHV-6 infection is clinically pertinent because HHV-6 is potentially treatable with the currently available antiviral agents.
authors.affiliation: Veterans Affairs Medical Center and University of Pittsburgh Medical Center, Thomas E. Starzl Transplantation Institute, Pennsylvania 15240, USA.
authors.forename: N
authors.initials: N
authors.lastname: Singh
authors.forename: D R
authors.initials: DR
authors.lastname: Carrigan
authors.forename: T
authors.initials: T
authors.lastname: Gayowski
authors.forename: I R
authors.initials: IR
authors.lastname: Marino
mesh_terms: D000328:Adult; D006566:Herpesviridae Infections / Q000097:blood / Q000453:epidemiology*; D015654:Herpesvirus 6, Human / Q000472:pathogenicity; D006801:Humans; D016031:Liver Transplantation; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction