August 2017

P-B11 (NP)


Signalment (JPC #2015661):  Ovine fetus

HISTORY:  One of two crossbred ovine fetuses that were aborted approximately 3-4 weeks prior to the expected date of parturition

HISTOPATHOLOGIC DESCRIPTION:  Lung:  There are multifocal, randomly distributed foci of necrosuppurative inflammation that affect approximately 25% of the section; these are composed of a central necrotic area of eosinophilic cellular and karyorrhectic debris and large colonies of 1 x 2 um bacilli surrounded by high numbers of viable and degenerate neutrophils, fewer macrophages and lymphocytes.  Multifocally, bacterial colonies are present within capillaries.  Diffusely, the remaining alveolar spaces, septa, vasculature, and bronchioles contain scattered inflammatory cells, eosinophilic, fibrillar material (fibrin), few erythrocytes (hemorrhage), necrotic cellular debris, and rarely globular yellow material (meconium).  There are widely dilated lymphatics and amorphic, homogenous, eosinophilic material (edema) that expands the perivascular space.  Diffusely, there is atelectasis and congestion.

MORPHOLOGIC DIAGNOSIS:  Lung:  Pneumonia, necrosuppurative, subacute, severe, with meconium and numerous large bacterial colonies, crossbred sheep, ovine

ETIOLOGIC DIAGNOSIS:  Pulmonary yersiniosis

CAUSE:  Yersinia pseudotuberculosis









Bacteria that appear histologically as large colonies:



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