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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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Thoughts on African Swine Fever Vaccines.

Daniel L Rock1

  • 1Department of Pathobiology, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL 61802, USA.

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Summary

African swine fever (ASF) is a deadly viral disease threatening the global swine industry. Developing effective vaccines and control methods is crucial to prevent devastating economic losses and protect animal health.

Keywords:
ASFAfrica swine feverprotective immunityvaccinevirulence and host range genes

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Area of Science:

  • Veterinary Virology
  • Animal Epidemiology
  • Disease Control

Background:

  • African swine fever (ASF) is a highly contagious viral hemorrhagic disease in domestic pigs, with near 100% mortality.
  • Recent ASF outbreaks in the Caucasus, Russia, Europe, China, and Southeast Asia demonstrate its global significance and spread.
  • The endemic nature of ASF strain Georgia-07 and its derivatives poses an existential threat to the worldwide swine industry.

Purpose of the Study:

  • To highlight the urgent need for effective disease control methods against African swine fever.
  • To emphasize the economic impact of ASF outbreaks, with potential U.S. losses estimated at $15 billion USD.
  • To underscore the necessity for immediate development of robust strategies, including vaccines, for ASF response and recovery.

Main Methods:

  • This study is a review and analysis of the current ASF epidemic and its implications.
  • Economic impact assessment based on hypothetical outbreak scenarios in the U.S.
  • Evaluation of disease transmission dynamics and virus environmental stability.

Main Results:

  • ASF strain Georgia-07 and its variants are now endemic across Europe and Asia.
  • The disease spreads rapidly among pigs and persists in the environment, complicating control efforts.
  • An ASF outbreak in the U.S. could cause severe economic damage, estimated at $15 billion USD over two years.

Conclusions:

  • Effective and robust methods, particularly vaccines, are immediately required for ASF control and recovery.
  • The global swine industry faces an ongoing and significant threat from ASF and emerging ASFV strains.
  • Proactive development of countermeasures is essential to mitigate the impact of this devastating animal disease.