Extended Data Fig. 6 |. Neutralization of historical H1N1 and H3N2 viruses.

Immunization scheme for ferret study is shown. Groups of Finch ferrets (N = 9) were used. Phylogenetic trees of HA sequences of human H1N1 (left) and H3N2 (right) viruses are shown (see Supplementary Table 4). Each symbol represents an individual animal and the horizontal bar indicates the geometric mean of the group. Statistical analysis was performed using nonparametric Kruskal–Wallis test with Dunn’s multiple comparisons. The ferret experiment was performed twice and representative data are shown.