This
report describes a case of proventricular
rupture associated with Psittaciforme 1
Bornavirus in a 10-year old Major Mitchell
Cockatoo (Lophochroa leadbeateri)
who presented with a 2-day
history of weakness and
weight loss. On necropsy, a fibrinonecrotizing coelomitis and an enlarged
proventriculus with a 0.5 cm in diameter transmural perforation characterized the main findings.
Histology confirmed the locally extensive, transmural necrotizing proventriculitis with coelomitis. Additionally, lymphoplasmacytic ganglioneuritis in the
proventriculus,
heart,
small intestine, and
adrenal gland, as well as lymphoplasmacytic
encephalitis, hallmarks of proventricular
dilatation disease. Psittaciform 1
bornavirus RNA was confirmed in the
brain,
proventriculus and
ventriculus by RT-PCR. Avian
Bornavirus antigen was identified by
immunohistochemistry in the
brain and
heart.