CDC / SCIENCE PHOTO LIBRARY CDC / SCIENCE PHOTO LIBRARY
Influenza virus structure. A portion of the virion's protein coat (capsid) has been cut away, revealing its core ribonucleic acid proteins (RNP, green). The surface proteins (blue, haemagglutinin [H]; and red, neuraminidase [N]), are shown, as well as ion channels (blue, round). These structures are identified in a key at right. Influenza A viruses are divided into subtypes based on the surface proteins. In the spring of 2009, a new influenza A (H1N1) virus caused an influenza pandemic. This artwork is not specific to a particular seasonal, avian or 2009 H1N1 virus.
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