Frequently Asked Flu Questions 2017-2018 Influenza Season
https://www.cdc.gov/flu/about/season/flu-season-2017-2018.htm
Follow that link and scroll down to “What viruses will the 2017-2018 flu vaccines protect against?”
The following is a quote.
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There are many different flu viruses and they are constantly changing. The composition of U.S. flu vaccines is reviewed annually and updated as needed to match circulating flu viruses. Flu vaccines protect against the three or four viruses (depending on vaccine) that research suggests will be most common. For 2017-2018, three-component vaccines are recommended to contain:
an A/Michigan/45/2015 (H1N1)pdm09-like virus (updated)
an A/Hong Kong/4801/2014 (H3N2)-like virus
a B/Brisbane/60/2008-like (B/Victoria lineage) virus
Quadrivalent (four-component) vaccines, which protect against a second lineage of B viruses, are recommended to be produced using the same viruses recommended for the trivalent vaccines, as well as a B/Phuket/3073/2013-like (B/Yamagata lineage) virus.
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Thank You!
that’s what I was looking for and didn’t see.