CD4 and Sepsis: And during the lymphocyte subgroup type analysis, the percentage of suppressor T-lymphocyte (CD8+ T-lymphocyte) (22.47 ± 10.40 vs 16.69 ± 8.45) and natural killer (NK) cell (12.38 ± 6.74 vs 7.44 ± 4.28) in KD with severe sepsis group were significantly higher than those in KD with non-severe group, while the CD4+/CD8+ T-lymphocyte ratio (1.49 ± 0.77 vs 2.51 ± 1.78) were significantly lower in severe group than in non-severe group (all P< 0.05, respectively) (Table 4; Figure 1).