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Detection of Low Copy Number Integrated Viral DNA Formed by In Vitro Hepatitis B Infection
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Detection of Low Copy Number Integrated Viral DNA Formed by In Vitro Hepatitis B Infection

Published on: November 7, 2018

Occult HBV infection.

Giovanni Raimondo1, Gaia Caccamo, Roberto Filomia

  • 1Unit of Clinical and Molecular Hepatology, Department of Internal Medicine, University Hospital of Messina, Messina, Italy. raimondo@unime.it

Seminars in Immunopathology
|July 26, 2012
PubMed
Summary
This summary is machine-generated.

Occult hepatitis B infection (OBI) involves persistent hepatitis B virus (HBV) genomes without detectable surface antigen. OBI reactivation can cause severe hepatitis and potentially contribute to liver cancer.

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Area of Science:

  • Hepatology
  • Virology
  • Immunology

Background:

  • Occult hepatitis B infection (OBI) is characterized by persistent hepatitis B virus (HBV) DNA in the liver, with undetectable HBV surface antigen (HBsAg) in serum.
  • While some OBI cases result from S-escape mutants, most involve replication-competent HBV with suppressed viral activity, influenced by host immunity and epigenetics.
  • OBI prevalence data vary due to differing detection method sensitivities, highlighting the need for standardized diagnostic approaches.

Purpose of the Study:

  • To elucidate the characteristics and clinical implications of occult hepatitis B infection (OBI).
  • To understand the mechanisms behind HBV suppression in OBI.
  • To assess the impact of OBI on disease progression and transmission.

Main Methods:

  • Review of existing literature on OBI detection, pathogenesis, and clinical significance.
  • Analysis of diagnostic challenges related to low viral loads and variant HBV strains.
  • Evaluation of OBI's role in transmission, reactivation, and liver disease progression.

Main Results:

  • OBI is a globally prevalent condition with significant clinical implications, including transmission via blood products and organ transplantation.
  • Immunosuppression can trigger OBI reactivation, leading to severe hepatitis.
  • OBI is associated with accelerated liver fibrosis, potentially contributing to cirrhosis and hepatocellular carcinoma, and retains oncogenic properties of overt HBV infection.

Conclusions:

  • Occult hepatitis B infection poses a significant public health challenge due to its transmission potential and association with severe liver disease.
  • Further research into OBI pathogenesis and improved diagnostic tools are crucial for effective management.
  • Addressing OBI is essential for preventing hepatitis B transmission and mitigating liver disease progression, including cancer development.