PECAM1 and infection: DGEs analysis showed that compared with HC group, the expression of genes related to phagocytosis, such as CLEC7A, NCF2, CD14, PECAM1, FGR, CORO1C, PYCARD, MYD88, ITGB1, CALR, FCGR1A and SYK, was increased in the monocytes from the KPN_ACU group (Figure 4A), indicating that the monocytes phagocytosis function of the patient is activated after infection with K. pneumoniae.