| Clinical signs | Score |
|---|---|
| Normal | 0 |
| Nose, head, or ear scratching (for less than 3 min); sneezing, coughing; skin reddening | 1 |
| Nose, head, or ear scratching (for greater than 3 min); skin reddening; excess salivation | 2 |
| Skin rash, vomiting, diarrhea, mania, gait disturbance, unsteadiness of gait | 3 |
| Pawing the ground, rolling, impaired mentation, somnolence, hypodynamia, wheezing | 4 |
| Urinary and fecal incontinence, hematemesis, hematochezia, breathlessness | 5 |
| Death | 6 |