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Spike-specific T cell response in seronegative KT recipients. The frequency of spike-specific IFN-γ-secreting T cells was compared after the second and the third dose of vaccine in KT recipients who have failed to seroconvert after the third dose. Data are shown as median and interquartile range. ***p<0•001, [Wilcoxon matched-pairs, two-tailed rank test].
