NaHS and GYY4137 were directly added to the culture medium at optimal and non-toxic concentrations (see Methods) at the time of M.F infection.As expected, M.F. infection induced an increase in MCP-1 production, which was most remarkable after 48 hours of infection in U937 cells (p = 0.01) [Figure 3A] and after 72 hours of infection in macrophages (p = 0.04) [Figure 3B].Both NaHS and GYY4137 reduced MCP-1 production [Figure 3]. Here, CCL2 is linked to infection.