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Causes of backyard bird mortality (n = 2,687) in 8 states during 2015–2017.
| No. of birds | |
|---|---|
| Bacterial | 1,135 |
| Neoplastic/lymphoproliferative | 1,131 |
| Parasitic | 755 |
| Generalized noninfectious | 444 |
| Nutritional/management/environmental | 261 |
| Viral | 195 |
| Undetermined | 123 |
| Fungal | 114 |
| Traumatic | 96 |
| Toxic | 41 |
| Developmental | 40 |
Concurrent disease was diagnosed in 69.1% of birds autopsied; thus, total numbers within the diagnosis categories exceeds number of birds autopsied per year.
