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Variations in anti-Spike Antibody Levels and Incidence of Breakthrough Infections Following Pfizer-BioNTech COVID-19 (BNT162b2) Vaccination. Median antibody level changes over time, presented as optical density (OD) levels (A) and concentrations (B), using red for increases and green for decreases, alongside the percentage and number of breakthrough cases at each time point (C).
