PECAM1 and Shock: Both the absolute numbers of naïve T cells (CD4+CD45RA+; 82/μL (sepsis) versus 316/μL (control); * p < 0.05) and RTEs (CD31+CD4+CD45RA+; 29/μL (sepsis) versus 220/μL (control); p < 0.05) were significantly lower in patients with septic shock (Figure 4C).