In addition to the assessment of the general lymphocyte subpopulations in the early phase of COVID-19, central memory T cells (Tm<sub>centr</sub> cells: CD45RO+CCR7+) and effector memory T cells (Tm<sub>eff</sub> cells: CD45RO+CCR7-) were assessed by multi-color flow cytometry, in comparison to a control group.<h4>Results</h4>During the study period, 148 study participants were recruited. This evidence concerns the gene CCR7 and COVID-19.