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Related Concept Videos

Hepatitis01:25

Hepatitis

Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver. The...
Viral Hepatitis I: Introduction01:28

Viral Hepatitis I: Introduction

Viral hepatitis is an inflammatory condition of the liver caused by infection with hepatotropic viruses, most commonly hepatitis A, B, C, D, and E. Despite variations in structure and transmission, all viruses mentioned infect hepatocytes and provoke immune responses that can hinder liver function. Additionally, some non-hepatotropic viruses can also lead to hepatic inflammation.Hepatitis A VirusHepatitis A virus (HAV) is transmitted through the fecal–oral route, typically by ingestion of food...
Retroviruses02:33

Retroviruses

Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
Viruses with RNA Genomes01:29

Viruses with RNA Genomes

RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
Exon Recombination02:32

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
Exon shuffling follows “splice frame rules.” Each exon has three reading...

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Chronic HDV Infection Shows Higher HBsAg Isoform Levels than HBV Infection, Paralleling HDV Replicative Activity.

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Updated: May 9, 2026

A Cell Culture Model for Producing High Titer Hepatitis E Virus Stocks
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A Cell Culture Model for Producing High Titer Hepatitis E Virus Stocks

Published on: June 26, 2020

Hepatitis delta: the rediscovery.

Mario Rizzetto1, Seyed Moayed Alavian

  • 1Division of Gastroenterology, University of Torino, Molinette, c.so Bramante 88, Torino 10126, Italy. mario.rizzetto@unito.it

Clinics in Liver Disease
|August 3, 2013
PubMed
Summary

Hepatitis D virus (HDV) is re-emerging globally, including in Western Europe and the United States, through immigration. This resurgence necessitates improved medical awareness and local infection mapping for this serious liver infection.

Keywords:
HDV drug addictsHDV epidemiologyHDV rediscoveryHDV transmissionHepatitis D (delta)Hepatitis D (delta) virus

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Area of Science:

  • Hepatology
  • Infectious Diseases
  • Virology

Background:

  • Hepatitis D virus (HDV) infection is a significant concern, often leading to severe liver disease.
  • Historically, HDV was thought to be declining in many regions, including the United States.

Purpose of the Study:

  • To highlight the re-emergence of Hepatitis D in Western Europe and the United States.
  • To emphasize the need for renewed awareness and surveillance of HDV infections.

Main Methods:

  • Clinical observation of HDV presentations.
  • Review of epidemiological trends and medical awareness regarding HDV.

Main Results:

  • Hepatitis D is increasingly observed in Western Europe due to immigration, presenting with classic severe symptoms.
  • HDV is also being rediscovered in developing nations and the US, challenging prior assumptions of its eradication.

Conclusions:

  • The global epidemiology of Hepatitis D is shifting, with notable resurgence in previously low-prevalence areas.
  • Enhanced local mapping of HDV infection and improved medical alert systems are crucial for effective public health response.