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Flu vaccine

The flu vaccine is a vaccine to protect against the highly variable influenza virus.

The annually updated trivalent flu vaccine for the 2005-2006 season consists of hemagglutinin (HA) surface glycoprotein components from influenza H3N2, H1N1, and B influenza viruses.

Each year the influenza virus changes and different strains become dominant.

Due to the high mutability of the virus a particular vaccine formulation usually only works for about a year.

Note:   The above text is excerpted from the Wikipedia article "Flu vaccine", which has been released under the GNU Free Documentation License.
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September 2, 2015

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updated 12:56 pm ET