CXCL5 and influenza: Considering that WT (CXCL5-/- BM) mice still expressed CXCL5 in the infected lungs after infection, the data demonstrate that influenza infection induces both CXCL5 production by lung tissue cells and CXCL5 release by blood-activated platelets, and the amount of CXCL5 protein released in the blood is greater than that produced by lung tissue cells in influenza virus-infected lungs.