Besides, other T cells subsets which are involved in antiviral response include unconventional NKT cells (CD56+) and MAIT (mucosa-associated invariant T) cells. NKT cells act at the interface between innate and adaptive immune response and traffic to the site of infection under the influence of cytokines (Tsay and Zouali, 2018). MAIT cells reside in the mucosal lining, such as in the lungs where they serve an immunoregulatory function. Both these cell types play an essential role in the early clearance of the SARS-CoV-2, along with other T cell subsets (Grifoni et al., 2020). Strategies to enhance their function are proposed to enhance the virial clearance during COVID-19 (Cao, 2020). Role of these cells will be further discussed under the dysfunctional immune response in section “T and B Cell Response in Mild/Moderate and Recovered COVID-19 Patients.”