WHO recommended that quadrivalent vaccines for use in the 2023 - 2024 season contain the following strains of the flu virus, as they predict that these strains will be the most prevalent across the northern hemisphere this flu season5:
Egg Based Vaccines |
Cell culture or recombinant-based vaccines |
an A/Victoria/2570/2019 (H1N1)pdm09-like virus |
an A/Wisconsin/67/2022 (H1N1)pdm09-like virus |
an A/Darwin/9/2021 (H3N2)-like virus |
an A/Darwin/6/2021 (H3N2)-like virus |
a B/Austria/1359417/2021 (B/Victorial lineage)-like virus |
a B/Austria/1359417/2021 (B/Victorial lineage)-like virus |
a B/Phuket/3073/2013(B/Yamagata lineage)-like virus |
a B/Phuket/3073/2013(B/Yamagata lineage)-like virus |
Strains for trivalent vaccines have also been recommended by WHO but not listed as not licenced within the UK.
5. World Health Organisation