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S-specific antibody responses after first (1D) and second dose (2D) of BTN162b2 mRNA vaccine against SARS-CoV-2 (limit of detection of 50 AU/mL). According to lack of T-cell response (green bars) or no response (blue bars) to the first dose. Each dot represents an individual after the first and second dose of vaccine. Boxes represent median and interquartile range. Lines between points indicate individual changes for the HCWs involved.
