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Kinetics of anti-S IgG titre between the second and third dose of BNT162b2 in the systematic cohort in (A) non-responders, (B) low reponders and (C) high responders. Each patient is represented by two squares with a connecting line. The red dashed line represents the cut-off value for test positivity. Comparisons were made using the Wilcoxon matched pairs ranked test. Logarithmic scale.
