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(a) T-cell reactivity against coronavirus disease 2019 (COVID-19) spike protein after SARS-CoV-2 BNT162b2 mRNA vaccine at 7–15 weeks after the second vaccine dose (Tcell1), 3 weeks (Tcell2), and 3 months after the third dose (Tcell3) in the 40 patients who remained during the entire study. (b) The individual change in T-cell reactivity against COVID-19 spike protein after SARS-CoV-2 BNT162b2 mRNA vaccine in 40 patients who remained during the entire study (‘spaghetti chart’).
