Table 2.
Definition of histopathologic scoring system used in a study of the microbiological and histopathological findings in cases of fatal bovine respiratory disease of feedlot cattle in western Canada
| Pathologic process | Definition |
|---|---|
| Suppurative bronchopneumonia | Suppurative bronchopneumonia/neutrophil infiltrations |
| Chronic suppurative pneumonia | Chronic suppurative pneumonia/abscesses |
| Bronchiectasis | Bronchiectasis/eosinophilic necrotic exudate |
| Fibrinonecrotizing pneumonia | Fibrinonecrotizing pneumonia/alveolar necrosis & fibrin; oat cells |
| Fibrinous pleuritis | Fibrinous pleuritis or interlobular inflammation/fibrin; edema; thrombotic lymphangitis |
| Hemorrhage | Hemorrhage/alveolar, perivascular, or septal |
| Bronchiolar necrosis | Bronchiolar necrosis/necrosis with or without syncytial cells |
| Bronchiolitis obliterans | Bronchiolitis obliterans |
| Acute/subacute interstitial pneumonia | Acute or subacute interstitial pneumonia/hypercellularity of alveolar septa; congestion; edema/hyaline membranes |
| Proliferative interstitial pneumonia | Proliferative interstitial pneumonia/type 2 pneumocytes; fibrosis |
| Other lesions | Bronchi-associated lymphoid tissue hyperplasia; vasculitis/granulomatous pneumonia; fungi; parasites |
1. The scoring system for each pathologic process was 0 — none, 1 — focal or multifocal lesion, 2 — single locally extensive lesion, 3 — widespread, extensive, or multiple locally extensive lesions, or 4 — diffuse lesion (throughout section)
2. All histopathologic examinations were performed by a single pathologist