In our model, some chemokines reported to be part of the "1st and 2nd waves" of chemokine expression by DC cells, specifically Xcl1, Cxcl9, Cxcl16, Ccl1, Ccl2, Ccl3, Ccl4, Ccl5, Ccl7 and Ccl8 are expressed at increased levels in lung i.n. samples at 3 weeks post-infection. Here, XCL1 is linked to infection.