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PHIL Image 11823
 
ID#:11823
Description:This illustration provides a 3D graphical representation of a generic influenza virion’s ultrastructure, and is not specific to a seasonal, avian or 2009 H1N1 virus. See PHIL 11822 for a view of this virus in which a portion of the virion’s protein coat, or “capsid”, has been cut away, revealing its inner nucleic acid core proteins, as well as a key identifying the organism’s protein constituents.

There are three types of influenza viruses: A, B and C. Human influenza A and B viruses cause seasonal epidemics of disease almost every winter in the United States. The emergence of a new and very different influenza virus to infect people can cause an influenza pandemic. Influenza type C infections cause a mild respiratory illness and are not thought to cause epidemics.

Influenza A viruses are divided into subtypes based on two proteins on the surface of the virus: the hemagglutinin (H), and the neuraminidase (N). There are 16 different hemagglutinin subtypes and 9 different neuraminidase subtypes. Influenza A viruses can be further broken down into different strains. Current subtypes of influenza A viruses found in people are influenza A (H1N1) and influenza A (H3N2) viruses. In the spring of 2009, a new influenza A (H1N1) virus emerged to cause illness in people. This virus was very different from regular human influenza A (H1N1) viruses and the new virus has caused an influenza pandemic.

Influenza B viruses are not divided into subtypes, however, influenza B viruses also can be further broken down into different strains.

High Resolution:Right click here and select "Save Target As..." for hi-resolution image (3.96 MB)
Content Providers(s):CDC/ Douglas Jordan
Creation Date:2009
Photo Credit:Illustrator: Dan Higgins
Links:
  • CDC - 2009 H1N1 Flu
  • CDC - Seasonal Incluenza (Flu)
  • CDC - Flu Virus Imagery
    Categories:
    CDC Organization

    MeSH
    tree picture Organisms
    tree picture tree picture Viruses
    tree picturetree picture tree picture RNA Viruses
    tree picturetree picturetree picture tree picture Orthomyxoviridae
    tree picturetree picturetree picturetree picture tree picture Influenzavirus A
    tree picturetree picturetree picturetree picturetree picture tree picture Influenza A virus
    tree picturetree picture tree picture Vertebrate Viruses
    tree picturetree picturetree picture tree picture RNA Viruses
    tree picturetree picturetree picturetree picture tree picture Orthomyxoviridae
    tree picturetree picturetree picturetree picturetree picture tree picture Influenzavirus A
    tree picturetree picturetree picturetree picturetree picturetree picture tree picture Influenza A virus
    Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.
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