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Clinical features of avian vacuolar myelinopathy in American coots

Journal of the American Veterinary Medical Association

By:
, , , , , , and
DOI: 10.2460/javma.2002.221.80

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Abstract

Objectivea??To characterize clinical features of avian vacuolar myelinopathy (AVM) in American coots. Designa??Case-control study. Animalsa??26 AVM-affected American coots and 12 unaffected coots. Proceduresa??Complete physical, neurologic, hematologic, and plasma biochemical evaluations were performed. Affected coots received supportive care. All coots died or were euthanatized, and AVM status was confirmed via histopathologic findings. Resultsa??3 severely affected coots were euthanatized immediately after examination. Seventeen affected coots were found dead within 7 days of admission, but 5 affected coots survived > 21 days and had signs of clinical recovery. Abnormal physical examination findings appeared to be related to general debilitation. Ataxia (88%), decreased withdrawal reflexes (88%), proprioceptive deficits (81%), decreased vent responses (69%), beak or tongue weakness (42%), and head tremors (31%), as well as absent pupillary light responses (46%), anisocoria (15%), apparent blindness (4%), nystagmus (4%), and strabismus (4%) were detected. Few gross abnormalities were detected at necropsy, but histologically, all AVM-affected coots had severe vacuolation of white matter of the brain. None of the control coots had vacuolation. Conclusions and Clinical Relevancea??Although there was considerable variability in form and severity of clinical neurologic abnormalities, clinical signs common in AVM-affected birds were identified. Clinical recovery of some AVM-affected coots can occur when supportive care is administered. Until the etiology is identified, caution should be exercised when rehabilitating and releasing coots thought to be affected by AVM.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Clinical features of avian vacuolar myelinopathy in American coots
Series title:
Journal of the American Veterinary Medical Association
DOI:
10.2460/javma.2002.221.80
Volume
221
Issue:
1
Year Published:
2002
Language:
English
Publisher:
American Veterinary Medical Association
Contributing office(s):
National Wildlife Health Center
Description:
p. 80-85
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of the American Veterinary Medical Association
First page:
80
Last page:
85