2019-20 H1N1 clade A5a.1 viruses have better in vitro replication compared with the co-circulating A5a.2 clade https://www.biorxiv.org/content/10.1101/2023.02.26.530085v1?med=mas
2019-20 H1N1 clade A5a.1 viruses have better in vitro replication compared with the co-circulating A5a.2 clade https://www.biorxiv.org/content/10.1101/2023.02.26.530085v1?med=mas