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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
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Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
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Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
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Related Experiment Video

Updated: Dec 10, 2025

Detection of Low Copy Number Integrated Viral DNA Formed by In Vitro Hepatitis B Infection
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Hepatitis B virus persistence and reactivation.

Yu Shi1,2,3, Min Zheng4,2,3

  • 1The State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital of School of Medicine, Zhejiang University, Hangzhou, China.

BMJ (Clinical Research Ed.)
|September 3, 2020
PubMed
Summary
This summary is machine-generated.

Hepatitis B virus (HBV) infection can persist, leading to reactivation risks. Understanding HBV persistence mechanisms and host immunity interplay is crucial for managing chronic hepatitis B and preventing reactivation.

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Modeling Hepatitis B Virus Infection in Non-Hepatic 293T-NE-3NRs Cells
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Area of Science:

  • Hepatology
  • Virology
  • Immunology

Background:

  • Hepatitis B virus (HBV) infection is a significant cause of chronic hepatitis with long-term complications.
  • Individuals with past HBV infection are susceptible to viral reactivation.
  • Understanding HBV persistence and reactivation is critical for patient management.

Purpose of the Study:

  • To review studies on HBV persistence and reactivation, focusing on definitions and mechanisms.
  • To elucidate the interplay between HBV replication and host immune response in viral persistence.
  • To raise awareness of HBV reactivation risks in various clinical settings.

Main Methods:

  • Literature review of studies on HBV persistence and reactivation.
  • Analysis of mechanisms driving HBV genome persistence (cccDNA, integrated DNA).
  • Examination of host immune responses in controlling or failing to control HBV replication.

Main Results:

  • HBV can persist in overt (chronic infection) or occult (resolved infection) states.
  • Viral persistence is determined by the host immune response's effectiveness.
  • Reactivation is triggered by alterations in the virus or host immune system.
  • HBV covalently closed circular DNA (cccDNA) and integrated DNA contribute to genome persistence.

Conclusions:

  • HBV persistence is a complex process involving viral and host factors.
  • Understanding HBV persistence and reactivation mechanisms is key to managing chronic hepatitis B.
  • Awareness of reactivation risks is vital for clinical practice and patient outcomes.