The KEGG results showed that the differences in IDA macrophages were primarily related to oxidative phosphorylation, NF−κB signaling, and antigen processing and presentation, while differences in M1 macrophages were mainly related to Yersinia infection, phagosome, salmonella infection, shigellosis, endocytosis, legionellosis, and tuberculosis (Figure 7B). This evidence concerns the gene NFKB1 and legionellosis.