Each year scientists collect samples and work to identify which samples are most likely to cause illness in the upcoming season.
The vaccine for 2011-2012 contain the following three viruses:
A/California/7/2009 (H1N1)-like virus;
A/Perth/16/2009 (H3N2)-like virus; and
a B/Brisbane/60/2008-like virus.
These three viruses have been deemed the most likely to cause illness in the northern and southern hemispheres.
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