Table 2 Histopathological scoring system used to assess inflammatory change in lung.
Histopathology grade | Perivascular and peribronchiola eosinophilia | Oedema | Epithelial damage |
|---|---|---|---|
0 | Normal | Normal | Normal |
1 | Lowgrade cell influx, no tissue pathology | Low grade diffuse oedema | Low grade cell loss |
2 | Low to moderate cell influx, low grade tissue damage | Moderate alveolar and bronchiolar oedema | Low grade cell loss |
3 | Moderate cell influx, low grade tissue damage | Regional and focal oedema | Moderate cell loss |
4 | Moderate to high cell influx, marked tissue damage | Pronounced oedema | Moderate cell loss |
5 | High cell influx, significant tissue pathology | Pneumonic type oedema | Epithelial metaplasia, mucus cell hyperplasia |
