Components of the 2020-2021 Northern Hemisphere seasonal influenza vaccines • A/Guangdong-Maonan/SWL1536/2019 (H1N1)pdm09–like virus (new for 2020-2021) • B/Washington/02/2019 (B/Victoria lineage)–like virus (new for 2020-2021) • A/Hong Kong/2671/2019 (H3N2)–like virus (new for 2020-2021)