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Levels of serum S1/S2 antibodies (AU/ml) in recipients of the BNT162b2 vaccine, by age, tested 7–35 days or 6 months after administration of the second dose, (A) as measured in our cohort and (B) as predicted by a generalized Poisson model. (A) Horizontal lines mark the upper (800 AU/ml) and lower (15 AU/ml) limits of detection. Trends are illustrated by loess curves, with 95% confidence intervals
