title: A novel DNA virus associated with feather inclusions in psittacine beak and feather disease.
abstract: The nature of feather inclusions was characterized in 32 psittacine birds (30 cockatoos, one peach-faced lovebird (Agapornis roseicollis), and one red-lored Amazon parrot (Amazona autumnalis autumnalis] with naturally-acquired psittacine beak and feather disease. Intranuclear inclusions within feather epithelial cells and intracytoplasmic inclusions within macrophages in the feather epithelium and pulp cavity contained psittacine beak and feather disease viral antigen when stained by the avidin-biotin complex immunoperoxidase technique. Ultrastructurally, inclusions were observed primarily within macrophages and to a lesser extent within epithelial cell nuclei. Macrophage inclusions appeared as paracrystalline arrays of viral particles. Intranuclear inclusions were less well defined, although scattered viral particles were present. Intracytoplasmic and intranuclear particles in ultrastructural preparations were identified by colloidal gold labeling as psittacine beak and feather disease virus. Feather epithelium was more frequently and severely involved in the disease process than was adjacent follicular epithelium. Plucked feathers with an intact epidermal collar and feather epithelium were preferred to follicular biopsies for histopathologic examination.
authors.affiliation: Department of Veterinary Pathology, College of Veterinary Medicine, University of Georgia, Athens.
authors.forename: K S
authors.initials: KS
authors.lastname: Latimer
authors.forename: P M
authors.initials: PM
authors.lastname: Rakich
authors.forename: W L
authors.initials: WL
authors.lastname: Steffens
authors.forename: I M
authors.initials: IM
authors.lastname: Kircher
authors.forename: B W
authors.initials: BW
authors.lastname: Ritchie
authors.forename: F D
authors.initials: FD
authors.lastname: Niagro
authors.forename: P D
authors.initials: PD
authors.lastname: Lukert
mesh_terms: D000818:Animals; D001502:Beak / Q000473:pathology; D001706:Biopsy; D001715:Bird Diseases / Q000382:microbiology*; D004267:DNA Viruses / Q000302:isolation & purification*; D004848:Epithelium / Q000382:microbiology / Q000473:pathology / Q000648:ultrastructure; D005241:Feathers / Q000382:microbiology* / Q000473:pathology / Q000648:ultrastructure; D007124:Immunoenzyme Techniques; D007150:Immunohistochemistry; D007181:Inclusion Bodies, Viral / Q000648:ultrastructure; D008264:Macrophages / Q000382:microbiology / Q000648:ultrastructure; D008854:Microscopy, Electron; D016253:Microscopy, Immunoelectron; D009336:Necrosis; D010311:Parrots; D011563:Psittaciformes; D012867:Skin / Q000382:microbiology / Q000473:pathology; D014771:Virion / Q000648:ultrastructure