CD33 and Sepsis: Expression of G-MDSCs (CD11b+CD33+HLADR−veCD14−ve) was found to be significantly increased in sepsis patients (p = 0.005) compared to w/o sepsis patients, while M-MDSCs (CD11b+CD33+HLADR−veCD14+ve) showed no significant difference between the groups (Figures 1A, B).