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What strains does the seasonal flu vaccine protect against?

Each flu season, all vaccines are prepared to the latest WHO specifications;

It is recommended that the vaccines for use in the 2019-2020 influenza season (northern hemisphere winter) contain the following:

  • A/Brisbane/02/2018 (H1N1)pdm09-like virus;
  • A/Kansas/14/2017 (H3N2)-like virus; *
  • B/Colorado/06/2017-like virus (B/Victoria/2/87 lineage);
  • B/Phuket/3073/2013-like virus (B/Yamagata/16/88 lineage).

    It is recommended that the influenza B virus component of trivalent vaccines for use in the 2019-2020 northern hemisphere influenza season be a B/Colorado/06/2017-like virus of the B/Victoria/2/87-lineage.
    * The A(H3N2) component was recommended on 21 March 2019.

You can find the full WHO flu vaccination strain specifications here

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