IL6 and infection: The differences in production of these cytokines and CCL2 in the different inbred mouse strains were most apparent in Lmo-InlA-mur-lux infected animals at 5 d.p.i. Compared to all other mouse strains, susceptible C3HeB/FeJ mice displayed the highest levels of CCL2, TNF-α, and IL-6 in the serum in response to Lmo-InlA-mur-lux infection (Figure 5E-H).