The frequency of S‐specific CD8+ T cells after the SARS‐CoV‐2 vaccine booster dose was similar among ND, T1D, and T2D participants, and no significant differences were observed in the percentage of individuals in whom S‐specific CD8+ T cells were detected between the ND and T1D groups (Figure 5A). Here, CD8A is linked to type 2 diabetes mellitus.