(A) Mice were infected with a 4LD50 inoculum of IAV. At day five post-infection, vascular permeability was measured by Evans blue extravasation. (B, C) On day 0 and day 3 of infection, mice were administered CXCL1 blocking antibody or isotype control antibody i.p. (C, E) Indicated cell populations were enumerated by flow cytometry. Data were pooled from two independent experiments, n=8-11 per group. Error bars represent SEM. **p<0.01, student's t-test.