The recommended composition of quadrivalent influenza vaccine for Australia in 2021 introduces a new A (H3N2) like virus strain and new strain for the B Victoria lineage when compared to the composition of the trivalent and quadrivalent vaccines for Australia in 2020.

In 2021 there will be five Quadrivalent and two Trivalent Influenza Vaccines available in Australia.

The Egg-based quadrivalent influenza vaccine components for the Australian 2021 influenza season will contain the following: 1

  • An A/Victoria/2570/2019 (H1N1)pdm09-like virus;
  • An A/Hong Kong/2671/2019 (H3N2)-like virus;
  • A B/Washington/02/2019-like (B/Victoria lineage) virus
  • A B/Phuket/3073/2013-like (B/Yamagata lineage) virus

The Cell-based quadrivalent influenza vaccine components for the Australian 2021 influenza season will contain the following: 1

  • An A/Wisconsin/588/2019 (H1N1)pdm09-like virus;
  • An A/Hong Kong/45/2019 (H3N2)-like virus;
  • A B/Washington/02/2019-like (B/Victoria lineage) virus
  • A B/Phuket/3073/2013-like (B/Yamagata lineage) virus

The trivalent influenza vaccine components for the Australian 2021 influenza season will contain the following: 1

  • An A/Victoria/2570/2019 (H1N1)pdm09-like virus;
  • An A/Hong Kong/2671/2019 (H3N2)-like virus;
  • A B/Washington/02/2019-like (B/Victoria lineage) virus

Vaccination is your best defence as recommended by the World Health Organisation 2


1. Australian Government, Dept Health and Ageing, Therapeutic Goods Administration. AIVC recommendations for the composition of influenza vaccine for Australia in 2021. Found at: http://www.tga.gov.au/aivc-recommendation-composition-influenza-vaccine-australia-2021 (Accessed 13 Oct 2020).
2. World Health Organisation Influenza factsheet No. 211, April 2009. Accessed 9 October 2014.