CXCL1 and infection: (E–H) Disease traits measured in a validation cohort (B6 vs CC042, CC032, CC037, and CC027) at 4 weeks after post low-dose aerosol infection (E) lung CFU (log10); (F) Weight (percent change relative to uninfected); (G) CXCL1 abundance in lung (log10 pg/mL homogenate); (H) IFNγ (log10 pg/mL homogenate).