Figure 1: pH1N1 Ab maturation occurs within 7 days after TIV.

(a) The amount (Max RU) and the avidity (Kd) of serum polyclonal Abs specific for pH1N1 HA1 at day 0, 7, and 28 post-TIV were determined by surface plasmon resonance. Paired t-test. ***p-value < 0.001, n = 26. (b) The correlation between Max RU and Kd of serum polyclonal Abs against pH1N1 HA1, and HI and VN titers. Results of day 0 and day 28 post-TIV. Spearman R and p-value are indicated. n = 52. (c) The correlation between the fold increase of Max RU/the fold decrease of Kd at day 28 and the increase of HI and VN titers at day 28. Spearman R and p-value are indicated. n = 26.