WHO recommended composition of influenza virus vaccines for use in the Northern hemisphere 2023-2024

Strain	The 2023 Southern hemisphere¹	The 2023-2024 Northern hemisphere.²
A/H1N1	an A/Sydney/5/2021 (H1N1)pdm09-like virus	an A/Victoria/4897/2022 (H1N1)pdm09-like virus
A/H3N2	an A/Darwin/9/2021 (H3N2)-like virus	an A/Darwin/9/2021 (H3N2)-like virus
B/Victoria	a B/Austria/1359417/2021 (B/Victoria lineage)-like virus	a B/Austria/1359417/2021 (B/Victoria lineage)-like virus
B/Yamagata	a B/Phuket/3073/2013 (B/Yamagata lineage)-like virus	a B/Phuket/3073/2013 (B/Yamagata lineage)-like virus

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Estimated Health and Economic Impact of Using High-Dose Influenza Vaccine on Respiratory and Circulatory Plus Respiratory Hospitalizations of Older Adults in Australia

MAT-TH-2300676-v1.0(06/23)