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Lower monofunctional and polyfunctional T cell responses against SARS-CoV-2 in chronic kidney disease patients who had COVID-19 after vaccination. Percentage of CD4+ IL-2+ -, CD4+ IFN-γ+IL-2+ -, CD8+ IFN-γ+IL-2+ -, and CD8+ IFN-γ+IL-2+TNF-α+-producing T cells after a booster dose in patients who had mild (n = 8) and severe COVID-19 (n = 4) or who remained uninfected (n = 51) in the follow-up period.
