CD33 and Sepsis: Flow cytometric analysis revealed that septic patients (n = 211) 4 days following sepsis had a median percentage (relative population) of 22.4% CD33+CD11b+HLA-DRlow/−CD14+ M-MDSCs and 7.9% CD33+CD11b+HLA-DRlow/−CD14− G-MDSCs (Table 1).