Background details of pigeon fanciers in study
| Symptomatic patients | Asymptomatic fanciers | |
| Subjects (n) | 17 | 11 |
| Age (mean, y) | 43 | 33 |
| Sex | 14f/3m | 11m |
| Smoking history: | ||
| Current smoker | 0 | 5 |
| Ex-smoker | 2 | 0 |
| Non-smoker | 15 | 6 |
| Exposure to pigeons (mean): | ||
| Pigeons kept (n) | 24 | 87 |
| Contact/week (h) | 67 | 12 |
| Duration pigeons kept (months) | 147 | 216 |
| Serum immunoglobulins (mean): | ||
| IgG (mg/dl) | 1277 | 1102 |
| IgA (mg/dl) | 279 | 202 |
| IgM (mg/dl) | 130 | 138 |
| IgE (IU/ml) | 42 | 31 |