鹦鹉喙羽症

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鹦鹉喙羽症（，簡稱PBFD），是一种由DNA病毒引起的鹦鹉传染疾病。病毒藉由病鸟的排泄物和羽屑进行传染，患病的鹦鹉会出现脱羽、羽毛变形及鸟喙变形等症状，并可能因沒有羽毛保溫以致鸚鵡失溫而死。由於目前尚無針對患有慢性鸚鵡喙羽症的鳥類的商業上可行的具體治療方法，因此這症可能是鸚鵡的絕症。

參考資料
延伸閱讀
Pass, D. A. and R. A. Perry. (1984). [http://www.ncbi.nlm.nih.gov/pubmed/6743145 The pathology of psittacine beak and feather disease.] Aust Vet J* 61, 69–74.
Pass, D. A. and R. A. Perry. (1985). Psittacine beak and feather disease: An update. Aust Vet Practit* 15, 55–60.
*Raidal, S. R., et al. (2005). [http://www.environment.gov.au/system/files/resources/1c3cb2d5-a226-4747-82cb-dc8f744283f3/files/p-c-disease-vaccine.pdf Development of Recombinant Proteins as a Candidate Vaccine for Psittacine Beak and Feather Disease.] Final Report for the Australian Government Department of the Environment and Heritage. Murdoch University, Perth, Western Australia.