However, in both sexes, the clinical findings, alterations in T cells, the reduced number of cluster of differentiation 4+ (CD4+) and cluster of differentiation 8+ (CD8+) effector memory cells and the elevated expression of the PD1 protein in central memory cells were found to persist for at least 13 months in individuals with Long COVID who had mild COVID-19(22,37). The gene discussed is CD8A; the disease is COVID-19.