Clinicopathologic and radiographic features and etiologic agents in cats with histologically confirmed infectious pneumonia: 39 cases (1991-2000).
OBJECTIVE
To determine clinicopathologic and radiographic features and etiologic agents in cats that died as a result of infectious pneumonia.


METHODS
Retrospective study.


METHODS
39 cats.


METHODS
Medical records of cats in which infectious pneumonia was confirmed by histologic examination of necropsy specimens were reviewed. Signalment, clinical signs, and results of a CBC, viral serologic tests, and thoracic radiography were evaluated. Infectious agents were classified as bacterial, viral, fungal, protozoal, or parasitic. Histologic features (severity, duration, anatomic location, and distribution) were analyzed.


RESULTS
Clinical signs referable to the respiratory tract were not detected in 14 of 39 (36%) cats, and results of a CBC (4/18 cats) and radiography (3/13) were unremarkable. Sixteen of 39 (41%) cats lacked clinical signs of systemic illness. Etiologic agents identified included bacteria (n = 21), viruses (11), fungi (6), protozoa (2), and parasites (1). Cats with clinical signs related to the respiratory tract (19/24 [79%] cats) were more likely to have severe histologic changes than cats without signs related to the respiratory system (6/14). Twenty-nine of 38 (76%) cats had histologic evidence of systemic disease, whereas the remaining cats had lesions limited to the respiratory tract.


CONCLUSIONS
Infectious pneumonia is uncommon in cats. Cats with infectious pneumonia may lack clinical signs and have unremarkable results for a CBC and thoracic radiography, yet frequently have systemic infections. Therefore, clinicians should maintain an index of suspicion for pneumonia and evaluate the respiratory tract when infection is detected in other organ systems.
Macdonald
Ellen S
ES
Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California, Davis, CA 95616-8734, USA.
Norris
Carol R
CR
Berghaus
Roy B
RB
Griffey
Stephen M
SM
D000818:Animals; D002371:Cat Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D002415:Cats; D005260:Female; D008168:Lung / Q000000981:diagnostic imaging / Q000473:pathology; D008297:Male; D011014:Pneumonia / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology / Q000662:veterinary*; D013902:Radiography, Thoracic / Q000662:veterinary; D012189:Retrospective Studies