"Psittacine beak and feather disease (PBFD) is a viral disease that can affect all psittacine birds (Parrots, Cockatoos and Lorikeets) and possibly, Doves. The virus attacks the cells of the immune system and those which produce feather and beak. Affected birds gradually lose their feathers and develop beak abnormalities. Because the virus attacks the immune system, affected birds succumb to infection by other diseases. The disease occurs in captive and wild birds and probably originated from Australia, for it is now found in psittacine birds in Europe and America."作者: tsw 時間: 2012-1-19 21:09