http://www.cdc.gov/flu/about/season/vaccine-selection.htm
On February 23, 2012 the WHO recommended that the Northern Hemisphere's 2012-2013 seasonal influenza vaccine be made from the following three vaccine viruses:
•an A/California/7/2009 (H1N1)pdm09-like virus;
•an A/Victoria/361/2011 (H3N2)-like virus;
•a B/Wisconsin/1/2010-like virus (from the B/Yamagata lineage of viruses).
While the H1N1 virus used to make the 2012-2013 flu vaccine is the same virus that was included in the 2011-2012 vaccine, the recommended influenza H3N2 and B vaccine viruses are different from those in the 2011-2012 influenza vaccine for the Northern Hemisphere.
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