Fig. 4

The histological morphologic changes of lungs in mice challenged with a lethal dose of Legionella pneumophila. a The lung sections from different groups were stained with hematoxylin and eosin (HE). Scale bar = 100 μm. b Lung injury score was shown. All data were expressed as mean ± SD (n = 6). ^***P < 0.001 versus the L.p-pcDNA3.1 group