From: Quantifying serum antibody in bird fanciers' hypersensitivity pneumonitis
 | Pigeon fanciers | Control subjects | |
---|---|---|---|
 |  | Healthy | Pathologic |
Number | 50 | 21 | 17 |
Pigeon serum | 37.7 | 0.01 | 2.5 |
 | (4.9–133.0) | (0.01-0.01) | (0.01–8.9) |
Pigeon feathers | 128.0 | 0.01 | 3.8 |
 | (33.2–250.0) | (0.01–2.5) | (1.00–4.7) |
Pigeon droppings | 202.5 | 21.9 | 28.2 |
 | (59.8–250.0) | (14.1–26.2) | (19.1–42.8) |