PMP22 and bacterial infectious disease: Consisting with the enrichment of opportunistic pathogens Klebsiella pneumonia, Escherichia coli, and Megamonas funiformis in CIDP, eighteen genes involved in bacterial infection, nine genes involved in bacterial invasion, three genes involved in quorum sensing were enriched in CIDP (Table 2), 70 genes involved in virulence factors were also enriched in CIDP (Additional file 1: Table S4).