Table 1.
Classification of case data from 154 horses living within a 30-km radius of either Guelph or Kitchener, Ontario (2007–2017).
| Case classification based on history and BALF cytologic interpretation | Total no. of cases | Mean (range) NCC (×109/L) | Mean, median (range) Neuts (%) | Mean, median (range) Eos (%) | Mean, median (range) Mast (%) | Mean, median (range) Hemosid (%) |
|---|---|---|---|---|---|---|
| 1. Insufficient sample for diagnosis | 7 | – | – | – | – | – |
| 2. No cytologic abnormalities | 7 | 0.41 (0.20–0.70) |
1.5, 0.97 (0–4) |
– | 1, 1 (0–1) |
– |
| 3. Hemosiderophages No granulocytic inflammation | 15 | 0.51 (0.38–1.6) |
3, 3 (2–5) |
0, 0 (0–1) |
1, 1 (0–2) |
9, 6 (2–36) |
| 4. Pneumonia, lung abscess, fever | 21 | 0.84 (0.28–5.9) |
54, 55 (21–94) |
1.3, 5.5 (0–14) |
0.8, 4 (0–6) |
Rarely noted |
| 5. Recurrent airway obstruction | 26 | 0.70 (0.28–1.2) |
38, 35 (14–70) |
0.1, 0 (0–2) |
1.3, 0 (0–9) |
– |
| 6. Increased proportion of lower airway granulocytes | 78 | 0.65 (0.23–1.6) |
5, 3 (0–15) |
2, 0 (0–31) |
4, 3.8 (0–10) |
7, 1.4 (0–47) |
Classification based on history and cytologic interpretation of bronchoalveolar lavage fluid. BALF, Bronchoalveolar lavage fluid; Eos, eosinophils; Hemosid, hemosiderophages; Mast, mast cells; Neuts, neutrophils; No., number; NCC, nucleated cell count.