Comparison between MBL haplotypes and serum MBL levels revealed, reduced serum MBL levels were associated with no HYA allele and HYA heterozygous than HYA homozygous in both patients with GBS (P = 0.0014 and P < 0.05; Fig. 2g) and healthy controls haplotypes (P < 0.05 and P < 0.0001; Fig. 2h). This evidence concerns the gene MBL2 and Guillain-Barre syndrome.