The cause of the 2009 swine flu was an influenza A virus type designated
as H1N1. In 2011, a new swine flu virus was detected. The new strain
was named influenza A (H3N2)v. Only a few people (mainly children) were
first infected, but officials from the U.S. Centers for Disease Control
and Prevention (CDC) reported increased numbers of people infected in
the 2012-2013 flu season. Currently, there are not large numbers of
people infected with H3N2v. Unfortunately, another virus termed H3N2
(note no "v" in its name) has been detected and caused flu, but this
strain is different from H3N2v. In general, all of the influenza A
viruses have a structure similar to the H1N1 virus; each type has a
somewhat different H and/or N structure.
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