IL9 and Sepsis: As shown in Fig. 3a, the serum percentages of IL-9-producing CD4(+) T cells of the control group were significantly lower than that of the sepsis group (0.43%±0.03% vs. 1.58%±0.41%, P =0.021) or the sepsis+IL-9 group (0.43%±0.03% vs. 3.53%±0.90%, P < 0.001).