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Viral Recombination00:57

Viral Recombination

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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Acute pancreatitis is the sudden inflammation of the pancreas caused by the early activation of digestive enzymes, leading to the autodigestion of pancreatic tissue. This results in local inflammation and, in severe cases, systemic complications.EtiologyUnderstanding the underlying causes is crucial, as identifying the etiology guides treatment and anticipates complications. Acute pancreatitis can be triggered by various factors, typically grouped into the following clinical categories.Biliary...
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Acute Pancreatitis II: Pathophysiology

The pathophysiology of acute pancreatitis centers on injury to pancreatic acinar cells, which initiates a cascade of harmful intracellular events.This injury leads to premature activation of trypsinogen to trypsin in the pancreas. Trypsin then activates other digestive enzymes, such as chymotrypsin, elastase, and phospholipase A2, which begin breaking down pancreatic tissue. The resulting autodigestion causes local inflammation, tissue swelling, hemorrhage, and fat necrosis.Injured acinar cells...

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Porcine astrovirus: a review.

Parveen Kumar1, Ritu Panghal2, Sanjeevna K Minhas3

  • 1Department of Veterinary Microbiology, Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar, Haryana, India. vetsparveen@gmail.com.

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Porcine astrovirus (PAstV) is a diverse virus found in pigs, causing uncertain gastrointestinal issues and recently linked to respiratory and nervous disorders. This review summarizes current knowledge and identifies research gaps for PAstV.

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Area of Science:

  • Virology
  • Veterinary Medicine
  • Molecular Biology

Background:

  • Porcine astrovirus (PAstV), a non-enveloped RNA virus in the Astroviridae family, exhibits significant genetic diversity with five known genotypes.
  • PAstV is traditionally associated with swine gastroenteritis, but its etiological role in diarrhea is unclear due to similar prevalence in healthy and sick pigs.
  • Emerging evidence links PAstV to respiratory and nervous system disorders in swine, expanding its known pathogenic potential.

Purpose of the Study:

  • To provide a comprehensive review of the current literature on Porcine astrovirus (PAstV).
  • To synthesize information regarding PAstV's genome, replication, epidemiology, pathogenesis, and clinical significance.
  • To identify knowledge gaps and guide future research directions for PAstV.

Main Methods:

  • Systematic review of published scientific literature on Porcine astrovirus.
  • Analysis of data concerning PAstV genome structure, viral life cycle, and genetic diversity.
  • Compilation of epidemiological, pathological, and clinical findings related to PAstV infections.

Main Results:

  • PAstV possesses a positive-sense, single-stranded RNA genome (6.4-7.3 kb) and considerable genetic variability.
  • The virus is detected in both diarrheic and healthy pigs, complicating its role as a primary enteropathogen.
  • PAstV has been increasingly associated with non-gastrointestinal conditions, including respiratory and neurological diseases in swine.

Conclusions:

  • This review consolidates existing knowledge on PAstV, covering its biology, disease associations, and detection methods.
  • Significant gaps remain in understanding PAstV's precise pathogenic mechanisms, epidemiological impact, and potential for cross-species transmission.
  • Further research is crucial to fully elucidate the role of PAstV in swine health and disease.