TABLE 1.

Histology activity score for scoring lung sections.

Score	Organ Degeneration; pulmonary Features
0	None
1	Mild Inflammatory Exudate; areas of patchy Edema with some sisordered structure
3	Moderate Alveolar thickening (25–50% Visualized Lung)
4	Severe Alveolar Congestion (>50% visualized lung); Cellular debris filling air space; complete Loss of Alveolar Structure
—	Inflammation
0	No inflammation
1	Mild inflammatory exudate
3	Moderate inflammatory exudate
4	Severe inflammatory exudate
—	Fibrosis/lesions
0	No fibrosis
1	Minimal architectural distortion; Alveoli partly enlarged but no fibrotic masses
3	Fibrosis with architectural distortion but preserved lung structure
4	Lung structure severely damaged; Alveolar septa nonexistent with complete obliteration with fibrotic masses
Total score 12	—