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Occult hepatitis B virus infection: implications in transfusion
1Division of Transfusion Medicine, Department of Haematology, University of Cambridge, Cambridge, UK. jpa1000@cam.ac.uk
Vox Sanguinis
|March 17, 2004
Summary
Occult hepatitis B infection (OBI) poses a transfusion risk, even with negative HBsAg screening. OBI can be infectious, particularly in immunocompromised recipients, highlighting the need for improved detection methods.
Area of Science:
- Transfusion Medicine
- Virology
- Immunology
Background:
- Hepatitis B virus (HBV) poses a greater transfusion transmission risk than HCV or HIV.
- Standard HBsAg screening misses occult HBV infection (OBI), where HBV DNA is present without detectable HBsAg.
- OBI can occur during window periods, late-stage infections, or in individuals with altered antibody profiles.
Purpose of the Study:
- To assess the infectivity of occult HBV infection (OBI) in transfusion settings.
- To evaluate the limitations of current serological screening for detecting infectious OBI.
- To discuss the implications of OBI for blood transfusion safety.
Main Methods:
- Review of evidence on OBI transmission and infectivity.
- Analysis of OBI characteristics, including viral load and serological markers (HBsAg, anti-HBs, anti-HBc, anti-HBe).
- Consideration of HBV DNA testing, including nucleic acid amplification technology (NAT).
Main Results:
- OBI is infectious in immunocompromised recipients.
- Components with anti-HBc and HBV DNA, or HBV DNA alone, may be infectious.
- Low viral loads in OBI (<500 IU/ml) challenge pooled plasma NAT sensitivity.
Conclusions:
- Occult HBV infection presents a residual transfusion risk.
- Improved NAT sensitivity or alternative detection methods are needed to enhance blood safety.
- Understanding OBI is crucial for preventing transfusion-transmitted HBV.