CXCR3 and COVID-19: A report suggested that MAIT cells also expressed CXCR3 (Saha et al., 2013), several studies have shown an increase in expression of early activation marker CD69 on MAIT cells and a decrease in expression of the homing marker CXCR3 in mild and severe cases of COVID-19 (Parrot et al., 2020; Flament et al., 2021; Deschler et al., 2021).