CCL2 and infection: A heatmap of these findings shows that at 4 DPI and 6 DPI compared with Naïve K18 mice, both Flu and COV2 infections significantly induced a greater number of pro-inflammatory genes such as Saa3 and chemokines such as Cxcl11, Cxcl10, Ccl, Ccl2, Ccl7.