For the 2017-2018 influenza season, the CDC has recommended all Americans over six months of age to receive an injectable flu vaccination by the end of October, but expressed no preference on the brand of flu shot. Live attenuated influenza vaccine (LAIV) is not recommended.

For the 2017-2018 season, US trivalent influenza vaccines will contain:

  • An A/Michigan/45/2015 (H1N1)pdm09–like virus;
  • An A/Hong Kong/4801/2014 (H3N2)–like virus; and
  • A B/Brisbane/60/2008–like virus, which is from the Victoria lineage of B viruses.

Quadrivalent vaccines will include an additional vaccine virus strain, a B/Phuket/3073/2013–like virus from the Yamagata lineage. This composition reflects a change in the H1N1 component from the previous season.