I got the quadrivalent vaccine this year.

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What flu viruses does this season’s vaccine protect against?

Flu vaccines are designed to protect against the main flu viruses that research suggests will be the most common during the upcoming season. Three kinds of flu viruses commonly circulate among people today: influenza A (H1N1) viruses, influenza A (H3N2) viruses, and influenza B viruses.

All of the 2015-2016 influenza vaccine is made to protect against the following three viruses:

• an A/California/7/2009 (H1N1)pdm09-like virus
• an A/Switzerland/9715293/2013 (H3N2)-like virus
• a B/Phuket/3073/2013-like virus. (This is a B/Yamagata lineage virus)

Some of the 2015-2016 flu vaccine is quadrivalent vaccine and also protects against an additional B virus (B/Brisbane/60/2008-like virus). This is a B/Victoria lineage virus.

Vaccines that give protection against three viruses are called trivalent vaccines. Vaccines that give protection against four viruses are called quadrivalent vaccines.