Granzyme K+CD8+T cells, which are low in GzmB and perforin, comprise the inflammatory CD8+T cells in inflamed tissues, such as synovium, synovial fluid, and several organs, such as gut, kidney, and bronchoalveolar lavage fluid (BALF) of COVID-19 patients (Figure 5) [305]. This evidence concerns the gene CD8A and COVID-19.