Comparison of serum MBL levels in various haplotypes in the three groups. The serum MBL level in the severe sepsis group was lower than the control group or the septic shock group (P < 0.05) for subjects with the HPA/LPA haplotype (a). The serum MBL level in the control group was lower than the severe sepsis group (P < 0.05) for subjects with the HPA/LPB haplotype (b) and higher than the severe sepsis group for subjects with the LPA/LQA haplotypes (c). Haplotype estimation was performed using Arlequin software. The median mannose-binding lectin (MBL) levels are indicated by horizontal bars. * P < 0.05 between the two groups.