One day after infection, the expression of Cxcl1, Cxcl2, Cxcl5, TNF-α, and IL-1β were 15 – 50-fold higher in lungs of Mki67WT mice exposed to hyperoxia when compared to Mki67WT mice exposed to room air (Fig. 6A–F). This evidence concerns the gene CXCL2 and infection.