title: The clinical significance of occult hepatitis B transfusion in Taiwan--a look-back study.
abstract: OBJECTIVE
  A look-back study was conducted to determine the clinical significance of occult hepatitis B virus (HBV) blood transfusion in an HBV hyperendemic area.
  
  
  OBJECTIVE
  To improve the blood transfusion safety.
  
  
  BACKGROUND
  Occult HBV is transmissible through blood transfusion in HBV-naÏve recipients. However, its impact on recipients with prevalent HBV infection in HBV hyperendemic areas is unclear.
  
  
  METHODS
  In 2006, 12 occult HBV blood donors were found from 10 824 repository samples by nucleic acid testing. The 74 corresponding recipients were identified and their pre- and post-transfusion clinical information was gathered, and the living recipients were recalled for follow-up. From the available archival sera, the HBV DNA was examined and sub-genomic sequences between paired donor and recipient were compared using polymerase chain reaction-based assays.
  
  
  RESULTS
  Among the 74 recipients, 18 were still alive and 12 returned to our clinic. From the available serological profiles, 76% of recipients had ongoing or recovered HBV infection before transfusion. Only 24 recipients had available post-transfusion serological profiles and none seroconverted to be hepatitis B surface antigen (HBsAg) positive. Moreover, except for the prior HBsAg carriers, the recipients' HBV DNA levels after transfusion were low (<20 IU/mL). One recipient had identical HBV surface gene sub-genomic sequence (384 nucleotides) to his donor. After transfusion, no recipient developed post-transfusion hepatitis (PTH) and the clinical outcome was good.
  
  
  CONCLUSIONS
  In HBV hyperendemic areas, occult hepatitis B transfusion might not lead to HBsAg carriage or PTH. The risk of transfusion-transmitted HBV infection was probably lower than that in non-endemic areas because most recipients had already experienced HBV infection.
authors: Department of Internal Medicine, Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine and National Taiwan University Hospital, Taipei, Taiwan.
authors: T-H
authors: TH
authors: Su
authors: P-J
authors: PJ
authors: Chen
authors: T-C
authors: TC
authors: Chen
authors: H-R
authors: HR
authors: Cheng
authors: L
authors: L
authors: Li
authors: K-S
authors: KS
authors: Lin
authors: J-H
authors: JH
authors: Kao
authors: D-S
authors: DS
authors: Chen
authors: C-J
authors: CJ
authors: Liu
mesh_terms: D000328:Adult; D004279:DNA, Viral / Q000097:blood; D019353:Endemic Diseases; D005260:Female; D006509:Hepatitis B / Q000453:epidemiology / Q000635:transmission*; D006514:Hepatitis B Surface Antigens / Q000097:blood; D006515:Hepatitis B virus / Q000302:isolation & purification*; D006801:Humans; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D015995:Prevalence; D012189:Retrospective Studies; D013624:Taiwan; D065227:Transfusion Reaction
chemical_list: D004279:DNA, Viral; D006514:Hepatitis B Surface Antigens