Figure 2. Compared with the control group, the splenic red medulla of the model group was congested with many erythrocytes, the white medulla was reduced in volume, and a large number of macrophages were visible in the germinal center, indicating splenic hyperfunction (shown by the yellow arrow in the left panel). There was thickening of the alveolar wall, increased inflammatory cell infiltration, destruction of alveolar structures, and fusion into large alveoli in the lungs (yellow arrows in the right panel).