Case 2 180817-2 (outside)
Conference Coordinator: Dr Molly Liepnieks.
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Adult, female American crow (Corvus brachyrhynchos)
Found down and euthanized
The keel is prominent with loss of pectoral musculature (poor body condition). The left air sacs (from caudal to cranial) are thickened with yellow, dry material covering the surfaces. The right foot has two 0.5-1 cm diameter exophytic, rough masses.
Lung: Multifocally, throughout the parenchyma are large granulomas filled with cellular debris and clusters of bacteria, surrounded by a band of epithelioid macrophages with fewer multinucleate giant cells. These granulomas occasionally have thin peripheral bands of fibrosis and multifocal clusters of lymphocytes, plasma cells, and macrophages.
Air sac: The air sacs are multifocally thickened and overlain by fibrin and clusters of bacteria admixed with moderate numbers of heterophils and macrophages.N/A
Lung: Multifocal, chronic granulomatous pneumonia with intralesional bacteria.
Air sacs: Multifocal to coalescing heterophilic and histiocytic airsacculitis with intralesional bacteria
The top differential for a bacterial pneumonia and airsacculitis is Pasteurella multocida, although culture of the air sac produced mixed growth. Other differentials include E. coli, Klebsiella pneumoniae, Yersinia spp., Streptococcus spp., and Pseudomonas spp.
Jubb, K. V. F., Peter C. Kennedy, and Nigel Palmer. Pathology of Domestic Animals. St. Louis, MO: Elsevier, 2016. Print.
Strugnell, B. W. et al. (2011). Investigations into an outbreak of corvid respiratory disease associated with Pasteurella multocida. Avian Pathology, 40(3), 329-336. doi:10.1080/03079457.2011.571659