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Related Concept Videos

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.
Viral Mutations00:36

Viral Mutations

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 for adaptive...
Infectious Diseases and Their Occurrence01:28

Infectious Diseases and Their Occurrence

Infectious diseases appear in populations through various transmission patterns, influenced by pathogen characteristics, population immunity, environmental conditions, and social behavior. Understanding these patterns is essential for effective public health surveillance and intervention. These categories—sporadic, outbreak, epidemic, pandemic, and endemic—help frame the nature and scope of disease events.Sporadic diseases occur irregularly and infrequently, without a predictable temporal or...
Viruses with RNA Genomes01:29

Viruses with RNA Genomes

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...
Influenza01:27

Influenza

Influenza is an acute, highly communicable viral disease that affects the respiratory tract and is responsible for seasonal epidemics worldwide. Influenza A is the most prevalent type associated with widespread outbreaks and is subtyped based on two surface glycoproteins: hemagglutinin (H) and neuraminidase (N), as in H1N1. These glycoproteins are essential for viral infectivity, transmission, and immune recognition. Transmission occurs primarily through respiratory droplets and contaminated...
Subviral Agents01:29

Subviral Agents

Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...

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Updated: May 26, 2026

Nasal Wipes for Influenza A Virus Detection and Isolation from Swine
05:59

Nasal Wipes for Influenza A Virus Detection and Isolation from Swine

Published on: December 4, 2015

Emerging and re-emerging swine viruses.

X J Meng1

  • 1Department of Biomedical Sciences and Pathobiology, Center for Molecular Medicine and Infectious Diseases, College of Veterinary Medicine, Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA, USA. xjmeng@vt.edu

Transboundary and Emerging Diseases
|January 10, 2012
PubMed
Summary

Emerging swine viruses present varied impacts, from subclinical infections to zoonotic risks. This review examines their transmission, epidemiology, and pathogenic potential, highlighting knowledge gaps for both economically significant and less impactful viruses.

Keywords:
Bungowannah virusMenangle virusNipah virusTorque teno sus virusporcine bocavirusporcine circovirus type 2porcine endogenous retrovirusporcine lymphotropic herpesvirusesporcine reproductive and respiratory syndrome virusporcine sapovirusporcine torovirusesswine hepatitis E virus

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Last Updated: May 26, 2026

Nasal Wipes for Influenza A Virus Detection and Isolation from Swine
05:59

Nasal Wipes for Influenza A Virus Detection and Isolation from Swine

Published on: December 4, 2015

A Seamless Cloning Approach for Porcine Reproductive and Respiratory Syndrome Virus Expression Vector Construction
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A Seamless Cloning Approach for Porcine Reproductive and Respiratory Syndrome Virus Expression Vector Construction

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Production of High-Titer Infectious Influenza Pseudotyped Particles with Envelope Glycoproteins from Highly Pathogenic H5N1 and Avian H7N9 Viruses
08:10

Production of High-Titer Infectious Influenza Pseudotyped Particles with Envelope Glycoproteins from Highly Pathogenic H5N1 and Avian H7N9 Viruses

Published on: January 15, 2020

Area of Science:

  • Veterinary Virology
  • Emerging Infectious Diseases
  • Swine Health

Background:

  • The global swine population has seen the emergence of numerous viruses over the past two decades.
  • These viruses range from economically significant pathogens like PRRSV and PCV2 to mostly subclinical agents such as TTSuV, PBoV, and others.
  • Some emerging swine viruses also pose zoonotic or xenozoonotic risks to human health.

Purpose of the Study:

  • To focus on emerging and re-emerging swine viruses with limited or uncertain clinical and economic impact.
  • To discuss the transmission, epidemiology, and pathogenic potential of these viruses.
  • To briefly address economically important viruses (PRRSV, PCV2) to identify knowledge gaps.

Main Methods:

  • Review of scientific literature on emerging swine viruses.
  • Analysis of transmission routes, epidemiological patterns, and pathogenicity.
  • Comparative discussion of viruses with varying economic and public health implications.

Main Results:

  • Identification of multiple emerging swine viruses with diverse impacts on pig health.
  • Categorization of viruses based on clinical significance and zoonotic potential.
  • Highlighting of specific viruses posing zoonotic (HEV, SaV) and xenozoonotic (PERV, PLHV) risks.

Conclusions:

  • Emerging swine viruses represent a complex challenge with implications for animal and public health.
  • Understanding the epidemiology and pathogenicity of less-studied viruses is crucial.
  • Further research is needed to address knowledge gaps, particularly for economically significant swine viruses.