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Parrots themselves are susceptible to a range of viral and bacterial diseases, including:
- **Pacheco’s Disease (Herpesvirus)**: Highly contagious among parrots but not transmissible to humans[2][3].
- **Beak and Feather Disease (Circovirus)**: Affects the immune system and feathers, not transmissible to humans[4].
- **Polyomavirus and Papillomavirus**: Affect parrots’ internal organs and feathers, generally not a human risk[3][4].