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Related Concept Videos

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...
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...
Leaky Scanning02:28

Leaky Scanning

During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
Chickenpox01:20

Chickenpox

Chickenpox is an acute, highly contagious disease caused by the varicella-zoster virus (VZV), a double-stranded DNA virus belonging to the Herpesviridae family. Its transmission occurs primarily through the inhalation of respiratory droplets or direct contact with vesicular fluid from skin lesions. The incubation period typically ranges from 10 to 21 days, during which the virus replicates and disseminates through sequential phases within the host. Although generally self-limiting in children,...
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...

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Related Experiment Video

Updated: Jul 15, 2026

Rapid Diagnosis of Avian Influenza Virus in Wild Birds: Use of a Portable rRT-PCR and Freeze-dried Reagents in the Field
08:46

Rapid Diagnosis of Avian Influenza Virus in Wild Birds: Use of a Portable rRT-PCR and Freeze-dried Reagents in the Field

Published on: August 2, 2011

Pandemic (avian) influenza.

Sumanth Rajagopal1, John Treanor

  • 1Department of Medicine, Infectious Diseases Division, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642, USA. sumanth_rajagopal@urmc.rochester.edu

Seminars in Respiratory and Critical Care Medicine
|April 27, 2007
PubMed
Summary

Avian influenza viruses, particularly H5N1, pose a significant pandemic threat. This review covers avian flu epidemiology, human transmission, clinical aspects, diagnostics, treatment, and global prevention strategies.

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Nasal Wipes for Influenza A Virus Detection and Isolation from Swine
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Nasal Wipes for Influenza A Virus Detection and Isolation from Swine

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Nasal Wipes for Influenza A Virus Detection and Isolation from Swine
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Nasal Wipes for Influenza A Virus Detection and Isolation from Swine

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Area of Science:

  • Virology
  • Epidemiology
  • Public Health

Background:

  • Influenza pandemics have a long history, with recent examples including Spanish (H1N1), Asian (H2N2), and Hong Kong (H3N2) flus.
  • Avian influenza viruses, especially H5N1 strains from poultry, are now recognized as a major source of novel pandemic influenza strains.
  • While human infections with avian strains are rare, outbreaks of severe H5N1 influenza since 2003 highlight the potential for widespread human disease.

Purpose of the Study:

  • To review the epidemiology and genetics of avian influenza viruses.
  • To discuss the potential for avian influenza transmission to humans.
  • To outline clinical features, diagnostics, treatment, and global prevention strategies for avian influenza.

Main Methods:

  • Literature review of avian influenza epidemiology, genetics, and human infections.
  • Analysis of historical pandemic data and recent H5N1 outbreaks.
  • Synthesis of information on diagnostic testing, antiviral treatments, and public health interventions.

Main Results:

  • Avian influenza viruses, particularly H5N1, are endemic in poultry and wild birds globally, posing a continuous pandemic risk.
  • Human infections with H5N1 can be severe, underscoring the need for vigilance and preparedness.
  • Global efforts including surveillance, culling, public education, vaccination, and antiviral use are crucial for prevention.

Conclusions:

  • Avian influenza viruses represent a significant and ongoing threat for future global pandemics.
  • A multi-faceted approach involving surveillance, rapid response, and medical countermeasures is essential to mitigate the impact of avian influenza.
  • Continued research and international cooperation are vital for pandemic preparedness and response.