Table 7.
Semi-quantitative histological scoring.
| Feature | Grade 0 | Grade 1 | Grade 2 | Grade 3 | Grade 4 |
|---|---|---|---|---|---|
| Cellular inflammation | The tissue appears normal, without any changes at all | Minimal | Mild | Moderate | Severe |
| Inflammatory cell differentiation in % | Lymphocytes, macrophages, neutrophils, eosinophils, mast cells | ||||
| Necrosis | The tissue appears normal, without any changes at all | Minimal | Mild | Moderate | Severe |
| Edema (intra-alveolar) | The tissue appears normal, without any edema | Minimal | Mild | Moderate | Severe |
| Emphysema | The tissue appears normal, without any changes at all | Minimal | Mild | Moderate | Severe |