世卫发布了2021年北半球流感疫苗建议毒株

世界卫生组织正式发布2021年北半球流感疫苗建议毒株，包括：

四价流感：

鸡胚株：
an A/Victoria/2570/2019 (H1N1)pdm09-like virus;
an A/Cambodia/e0826360/2020 (H3N2)-like virus;
a B/Washington/02/2019 (B/Victoria lineage)-like virus; and
a B/Phuket/3073/2013 (B/Yamagata lineage)-like virus.

细胞株或重组：
an A/Wisconsin/588/2019 (H1N1)pdm09-like virus;
an A/Cambodia/e0826360/2020 (H3N2)-like virus;
a B/Washington/02/2019 (B/Victoria lineage)-like virus; and
a B/Phuket/3073/2013 (B/Yamagata lineage)-like virus.

三价流感：

鸡胚株
an A/Victoria/2570/2019 (H1N1)pdm09-like virus;
an A/Cambodia/e0826360/2020 (H3N2)-like virus; and
a B/Washington/02/2019 (B/Victoria lineage)-like virus.

细胞株或重组：
an A/Wisconsin/588/2019 (H1N1)pdm09-like virus;
an A/Cambodia/e0826360/2020 (H3N2)-like virus; and
a B/Washington/02/2019 (B/Victoria lineage)-like virus.