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Correlation between IgG and memory B-cells. Spearman’s correlation coefficient (rs) between the numbers of IgG-specific memory B-cells/105 CD19+ cells (x-axis) at 2 weeks post-booster and the specific IgG levels in IU/mL (on the y-axis) at 1 year post-booster (A,C) and at 2 years post-booster (B,D) for pertussis toxin; (A,B) and for pertactin; (C,D). p = p-value.
