FCGR2A and escherichia coli infection: Upon GB pretreatment, pathways related to phagosome, pathogenic E. coli infection and protein in endoplasmic reticulum were enriched, while GBHC-4 pretreatment enriched pathway associated with arginine and protein metabolism, aminoacyl-tRNA biosynthesis, Fc γ R-mediated phagocytosis and endocytosis.