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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...

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An Evaluation of Hepatitis E Virus Molecular Typing Methods.

Sally A Baylis1, Cornelia Adlhoch2, Liam Childs3

  • 1Viral Safety Section, Paul-Ehrlich-Institut, Langen, Germany.

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|December 30, 2021
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Molecular typing of Hepatitis E virus (HEV) strains is crucial for understanding transmission. A study found most labs correctly identified HEV genotypes and subtypes, but some issues with contamination and sequence generation were noted.

Keywords:
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Area of Science:

  • Virology
  • Infectious Diseases
  • Molecular Epidemiology

Background:

  • Hepatitis E virus (HEV) is a significant cause of acute viral hepatitis globally.
  • Accurate molecular typing of HEV strains is vital for tracking transmission routes and identifying outbreaks.
  • Understanding HEV subtypes is essential for effective public health interventions.

Purpose of the Study:

  • To assess the performance of laboratories in molecular typing of HEV.
  • To evaluate the accuracy of genotype and subtype determination for HEV strains.
  • To identify challenges and areas for improvement in HEV molecular epidemiology.

Main Methods:

  • A blinded panel of 11 distinct Orthohepevirus A strains was distributed to 28 participating laboratories.
  • Laboratories employed their standard HEV sequencing and genotyping methodologies.
  • Analysis focused on sequence data generated from routine laboratory procedures.

Main Results:

  • 25 laboratories returned results, with 93% correctly assigning genotypes and 81% correctly assigning subtypes.
  • Good agreement was observed for overlapping sequence fragments, but some incorrect genotypes/subtypes were reported.
  • Contamination issues were identified, including misidentification of a Zika virus sample as HEV.

Conclusions:

  • Laboratory identification of HEV genotypes was generally accurate.
  • Challenges remain, including occasional failures in sequence generation and the need for harmonization of typing resources.
  • Improving laboratory capacity and standardization is necessary for reliable HEV molecular epidemiology.