CXCL9 and infection: Furthermore, while the kinetics of CXCL9 production were similar between WT and IL-10−/− mice on days 4 and 5 post infection, CXCL9 levels produced by IL-10−/− leukocytes were greater 7 days post infection as compared to levels measured in WT leukocyte conditioned media (Fig. 3F).