Influenza A virus subtype H7N9 is a subtype of the influenza A virus, which causes influenza, predominantly in birds. It is enzootic in many bird populations. The virus can spread rapidly through poul
The N in H7N9 stands for "Neuraminidase", the protein depicted in this ribbon diagram.
Live poultry market in Xining, China, 2008.
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Influenza A virus subtype H5N1 is a subtype of the influenza A virus that causes the disease avian influenza. It is enzootic in many bird populations, and also panzootic. A/H5N1 virus can also infect
Influenza A virus subtype H7N9
…and each outbreak has been limited to a few people. All subtypes of avian Influenza A have potential to cross the species barrier into humans, with H5N1 and H7N9 considered the biggest threats. Prior to 2013, A/H7N9 had previously been isolated only in birds, with outbreaks reported in the Netherlands…
Colorized transmission electron micrograph of Avian influenza A H5N1 viruses