EpCAM expression by ATII cells isolated from SP-CGFP mice decreased following influenza A virus infection. Effect of infection with influenza A/WSN/33 virus on: percentage expression of EpCAM in all ATII cells (A), EpCAM MCF in all ATII cells (B), and percentage expression of EpCAM in GFP+ and PODO+ cells within the ATII cell gate (C); n = 3 uninfected mice, 4 mice at 2 dpi, and 7 mice at 6 dpi. Samples gated as in Fig. 6A. *P < 0.05, §P < 0.005, and #P < 0.001 vs. uninfected mice for each group. ¶P < 0.001 vs. 2 dpi. Data are presented as means ± SE.