Leukocytes can be attracted to inflammatory sites by chemokines which, together with integrin-mediated binding, facilitate the migration through the endothelium to the site of infection.44 A number of chemokines including CCL2, CCL3, CCL4, CCL5, CXCL9, and CXCL10, were detected in lung homogenates upon VV-OVA infection. This evidence concerns the gene CCL3 and infection.