| Environmental source | Major causative antigen |
| Bird fancier's lung (parakeets, budgerigars, pigeons) | Droppings, feathers, serum proteins |
| Poultry worker's lung (feather plucker's disease) | Serum proteins (chicken products) |
| Turkey handling disease | Serum proteins (turkey products) |
| Canary fancier's lung | Serum proteins |
| Duck fever | Feathers, serum proteins |
