CD4 and COVID-19: The CD4+Tcm cells were higher in the CONVIDECIA group (35.97 ± 9.651) than in the Recombinant COVID-19 Vaccine (Sf9 Cells) group (27.24 ± 7.461) and also higher than the KCONVAC vaccine group (24.08 ± 6.642) (P<0.1) (Figure 3).