SNAI1 and infection: We observed that the expression of E-cadherin, the epithelial marker, was lower in lungs of mice upon WSN infection than that upon Yamagata infection (Figure 1C), while the expression of mesenchymal markers, such as N-cadherin (Figure 1D), β-catenin (Figure 1E), vimentin (Figure 1F), snail (Figure 1G), cyclin D (Figure 1H), PPAR (Figure 1I), TCF-1 (Figure 1J), and TGF-β (Figure 1K), was significantly higher in lungs of mice upon WSN infection than that upon Yamagata infection.