The presence of both SARS-CoV-2-specific polyfunctional memory T cells producing IFNγ, IL-2, and TNFα simultaneously and CCR7+CD45RA+CD95+ TSCM cells in convalescent patients 10 months post-infection regardless of the disease severity indicated that SARS-CoV-2-specific T cell memory could be long-lasting and effective in rapid viral clearance in the case of re-infection, as well as it could protect patients from developing severe COVID-19 [93]. This evidence concerns the gene CCR7 and infection.