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antigenic shift

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Forum Name: Pets & Animals
Forum Description: (What about my pet?)
URL: http://www.avianflutalk.com/forum_posts.asp?TID=5006
Printed Date: March 28 2024 at 5:32am


Topic: antigenic shift
Posted By: Siameselade
Subject: antigenic shift
Date Posted: March 29 2006 at 9:34am
http://www3.niaid.nih.gov/news/focuson/flu/illustrations/antigenic/antigenicshift.htm">http://www3.niaid.nih.gov/news/focuson/flu/illustrations/antigenic/antigenics

Focus on the Flu


Antigenic Drift vs. Antigenic Shift



Antigenic Shift

The genetic change that enables a flu strain to jump from one animal species to another, including humans, is called antigenic shift.  Antigenic shift can happen in three ways:

Antigenic Shift 1

  • A duck or other aquatic bird passes a bird strain of influenza A to an intermediate host such as a chicken or pig.
  • A person passes a human strain of influenza A to the same chicken or pig.
  • When the viruses infect the same **ll, the genes from the bird strain mix with genes from the human strain to yield a new strain.
  • The new strain can spread from the intermediate host to humans.

Antigenic Shift 2

  • Without undergoing genetic change, a bird strain of influenza A can jump directly from a duck or other aquatic bird to humans.

Antigenic Shift 3

  • Without undergoing genetic change, a bird strain of influenza A can jump directly from a duck or other aquatic bird to an intermediate animal host and then to humans.

The new strain may further evolve to spread from person to person. If so, a flu pandemic could arise.

http://www3.niaid.nih.gov/NR/rdonlyres/64D60C8B-99D2-4C21-99CC-07D979B00CBA/0/AntigenicShift_HiRes.jpg - Download the high resolution version http://www3.niaid.nih.gov/news/focuson/flu/illustrations/antigenic/antigenicshift.htm - of the Antigenic Shift illustration.

http://www3.niaid.nih.gov/news/focuson/flu/illustrations/antigenic/antigenicdrift.htm - Veiw Antigenic Drift http://www3.niaid.nih.gov/news/focuson/flu/illustrations/antigenic/antigenicshift.htm - hift.htm

 Original post by guest


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Siam



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