Table 3. Score for alveolar inflammation.

Score	Description
0	No lung tissue inflammation
1	Mild pulmonary inflammation, inflammatory cell infiltration is limited to local or near the pleura, the area is less than 20% of the whole lung
2	Moderated pulmonary tissue inflammation, the affected area of the lung accounted for 20% to 50%
3	Severe pulmonary tissue inflammation, involved area was greater than 50%