Figure 5

Antigenic cartographies to illustrate the key mutations driving the 4 antigenic drift events including (a) SI87-BE89, (b) BE89-BE92, (c) BE92-WU95, and (d) WU95-SY97.
Antigenic cartographies to illustrate the key mutations driving the 4 antigenic drift events including (a) SI87-BE89, (b) BE89-BE92, (c) BE92-WU95, and (d) WU95-SY97.