Fig. 3

Ratio of antibody titers targeting defined regions of the S1 subunit. The y-axis in each panel represents the percentage of total S1-targeting antibodies that bind to the indicated region(s). P-values were calculated using the Wilcoxon–Mann–Whitney test with R (***p < 0.001). (A) The ratio of antibody titers targeted at A + B of the S1 subunit. (B) The ratio of antibody titers targeted at A of the S1 subunit. (C) The ratio of antibody titers targeted at B of the S1 subunit.