Morphological study of bacterial pneumonia of ...

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Title Morphological study of bacterial pneumonia of feedlot cattle: determination of age of lesions
Author(s) Pierre Y. Daoust
Journal The Canadian Veterinary Journal. La Revue Veterinaire Canadienne
Date 1989
Volume 30
Issue 2
Start page 155
End page 160
Abstract Lungs from 48 feedlot cattle that had died from bacterial pneumonia were examined grossly and microscopically. Criteria based on microscopic lesions were adopted to age these pneumonias. In 38 cases, pneumonic lesions were of relatively uniform age throughout the affected tissue. In eight other cases, the presence of older lesions confined to one or two lobes suggested a previous episode of pneumonia. The aging criteria adopted were in agreement with the duration of the observed clinical signs in 26 cases. In 13 other cases, the pneumonia was estimated to be of longer duration than suggested by the history, whereas in the remaining nine cases, it was estimated to be more recent. Areas of tan discoloration of the parenchyma surrounded by white or yellow borders were considered the best areas to examine microscopically since they offered the best chances of revealing necrosis and fibrosis, the main lesions used to age the pneumonia.

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