From: Quantifying serum antibody in bird fanciers' hypersensitivity pneumonitis
 | Category of likelihood of HP | ||
---|---|---|---|
 | Probable | Possible | Unlikely |
Number | 22 | 10 | 18 |
Pigeon serum | 135.0 | 70.3 | 3.4 |
 | (49.6–161.0) | (23.0–94.9) | (0.01–11.1) |
Pigeon feathers | 250.0 | 174.0 | 12.4 |
 | (142.5–250.0) | (80.0–250.0) | (2.3–86.4) |
Pigeon droppings | 250.0 | 250.0 | 43.2 |
 | (250.0-250.0) | (121.5–250.0) | (26.2–101.8) |