By day 7, expression of Ccl3, Cxcl9, Cd86, Il-6, Cd80, and Cxcl11 remained elevated in young adult lung in response to H1N1, while expression of Ccl5, Ccl4, and Cd40 remained elevated in response to either strain of influenza (Figure 4A–D, Supplemental Table S1). This evidence concerns the gene CD40 and influenza.