A study on 21 KTR showed that approximately 57% of them presented detectable SARS-CoV-2-specific cell-mediated immunity 6 months after infection (more often CD4+ T cell than CD8+ T cell response), as determined by flow cytometry and IFN-γ FluoroSpot (Mabtech) assay [25]. The gene discussed is CD4; the disease is infection.