Avian polyomavirus infection is a viral disease that primarily affects birds, particularly parrots and other pet birds. The virus can cause a range of symptoms, including feather abnormalities, lethargy, and in severe cases, sudden death. Young birds are especially vulnerable, as their immune systems are not fully developed. Transmission of the virus occurs through direct contact with infected birds or contaminated environments. Infected birds can shed the virus even if they do not show symptoms, making it crucial for bird owners to maintain good hygiene and monitor their pets for any signs of illness.