Figure 2

Histological observations of the four groups of lung tissues (HE staining).

The Con group was normal lung tissue. The structure of the pulmonary alveoli was clear and the alveolar wall was thin. The Pac group showed severe inflammation, the alveolar structures were disordered and there were edema and broadening in the lung interstitium and hemorrhage in both the alveolar cavity and the interstitium. The Pac + Pare group showed significantly reduced symptoms compared with the Pac group, with only slight edema. The Pare group was more similar to the Con group.