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Viral Recombination00:57

Viral Recombination

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Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
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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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Lessons learnt on infectious bronchitis virus lineage GI-23.

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|August 27, 2024
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Summary

Infectious bronchitis virus (IBV) remains a challenge for poultry due to rapid evolution. New homologous vaccines are needed to control highly virulent IBV Variant 2-like strains, which cause significant kidney damage.

Keywords:
Infectious bronchitisInfectious bronchitis virusLineage GI-23Variant 2Variant 2-like strainsimmunoprophylaxis

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Area of Science:

  • Veterinary Virology
  • Avian Infectious Diseases
  • Coronaviruses

Background:

  • Infectious bronchitis virus (IBV) is a significant global poultry health concern, despite extensive immunoprophylaxis efforts.
  • Rapid viral evolution, high mutation rates, and reliance on specific antibody responses complicate IBV control.
  • IBV strains are classified into genotypes based on S1 gene sequences, with numerous lineages rapidly emerging.

Purpose of the Study:

  • To review the latest knowledge on avian coronavirus biology, focusing on IBV.
  • To provide an overview of IBV Variant 2-like strains, their emergence, characteristics, and control strategies.
  • To highlight the challenges in controlling IBV due to its genetic diversity and antigenic variation.

Main Methods:

  • Literature review of scientific publications on Infectious Bronchitis Virus.
  • Analysis of IBV classification based on S1 gene sequencing.
  • Examination of the evolution, dissemination, and pathogenicity of IBV Variant 2-like strains.
  • Review of current immunoprophylaxis and vaccine strategies against IBV.

Main Results:

  • IBV Variant 2-like strains exhibit high virulence and significant nephrotropism and nephropathogenicity.
  • Existing vaccine strains offer limited protection against emergent IBV Variant 2-like strains.
  • The molecular mechanisms underlying the pathogenicity of IBV Variant 2-like strains require further elucidation.

Conclusions:

  • The rapid evolution and antigenic diversity of IBV necessitate continuous monitoring and adaptation of control strategies.
  • Development and implementation of homologous vaccines against IBV Variant 2-like strains are crucial for mitigating economic losses in the poultry industry.
  • Further research into the molecular pathogenesis of IBV Variant 2-like strains is needed to improve disease management.