CXCL1 and infection: There was significantly more GM-CSF, CCL2, CXCL2, IL-6, CXCL1, CXCL10 and CCL3 in the lungs of adult infected mice compared to infected neonatal mice (Fig. 2D); CCL5 protein levels were elevated after infection in both ages, but there was no difference between ages of mice.