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Related Concept Videos

Viruses with RNA Genomes01:29

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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...
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Viral Mutations00:36

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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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Related Experiment Video

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A Cell Culture Model for Producing High Titer Hepatitis E Virus Stocks
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Hepatitis E virus: has anything changed?

Alexandra N Willauer1, Kenneth E Sherman2

  • 1Department of Internal Medicine.

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|March 28, 2023
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This summary is machine-generated.

Hepatitis E virus (HEV) infection is a global concern, often underdiagnosed. Recent findings reveal new HEV genotypes and transmission routes, highlighting the need for better diagnosis and prevention strategies, including vaccines.

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Area of Science:

  • Hepatitis E virus (HEV) research
  • Infectious disease epidemiology
  • Vaccinology

Background:

  • HEV is a significant global health issue, causing both acute and chronic hepatitis, yet it remains underdiagnosed.
  • The World Health Organization (WHO) estimates 20 million annual HEV infections, with epidemiology, diagnosis, and prevention still poorly understood in many areas.
  • Understanding HEV is crucial for public health, impacting millions globally.

Approach:

  • Reviewing recent advancements in HEV epidemiology, diagnosis, and prevention.
  • Analyzing the clinical implications of different HEV genotypes (HEV-A, HEV-C) and transmission routes.
  • Evaluating the role of vaccination campaigns and targeted response strategies.

Key Points:

  • HEV-A genotypes 1 and 2 are transmitted fecal-orally, causing acute hepatitis. A vaccine campaign was initiated in 2022.
  • HEV-A genotypes 3 and 4 are zoonotic, leading to chronic infections in immunocompromised individuals. Pregnant and immunocompromised populations are at high risk.
  • Zoonotic transmission of Orthohepevirus C (HEV-C) from rodents to humans is a newly identified concern, expanding the known HEV spectrum.

Conclusions:

  • Accurate clinical recognition and diagnosis of HEV are vital for effective management and understanding disease burden.
  • Epidemiological insights are crucial for tailoring clinical presentations and response strategies.
  • Targeted interventions, including potential vaccine campaigns, are necessary for HEV prevention and control.