We analyzed transcripts of genes frequently used as M1 (MCP-1, SOCS3, iNOS, IL-12, IL-1β, IL-12β, and NOX2) or M2 (MRC1, TGM2, MSR1, MMP12, CD200R, and CCL17) macrophage polarization markers in three time points of infection (2, 24, and 48 hpi) and in two different infections (S. Typhimurium and Y. enterocolitica) of THP-1 macrophages pre-treated with PGE2 or vehicle control (Figure 8). The gene discussed is CD200R1; the disease is infection.