Multifocal Pulmonary Abscesses due to Trueperella Pyogenes in Sheep

Harry Hariharan,Muhammad I Bhaiyat,Alfred Chikweto,Keshaw P Tiwari

doi:10.5171/2016.366083

Harry Hariharan, Muhammad I Bhaiyat + Show 2 more

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https://doi.org/10.5171/2016.366083

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Abstract

Multifocal Pulmonary Abscesses due to Trueperella Pyogenes in Sheep

Highlights

Pneumonia is often diagnosed in adult sheep because the animal presents with an increased respiratory rate and breathing effort despite the fact that many infections affecting other organ systems can present with such signs including mastitis, metritis, clostridial diseases, and painful conditions such as lameness
We report an uncommon case of multiple pulmonary abscesses due to Trueperella pyogenes in a sheep in Grenada, a tropical island nation
The bronchiolar epithelium is necrotic and the lumen contains neutrophils and macrophages admixed with cellular debris and bacterial colonies; alveoli spaces contain lightly pink edematous fluid admixed with lymphocytes and macrophages; chronic bronchopneumonia. (H&E stain, X200)

Summary

Introduction

Pneumonia is often diagnosed in adult sheep because the animal presents with an increased respiratory rate and breathing effort despite the fact that many infections affecting other organ systems can present with such signs including mastitis, metritis, clostridial diseases, and painful conditions such as lameness. Pneumonia with pulmonary abscesses due to Pasteurella multocida, and Staphylococcus aureus, followed by Trueperella pyogenes,. Trueperella pyogenes is best known as an abscess-forming bacterium (Cebra and Cebra, 2002). This organism is one of the most common opportunistic pathogens in domestic ruminants. We report an uncommon case of multiple pulmonary abscesses due to Trueperella pyogenes in a sheep in Grenada, a tropical island nation. There was chronic suppurative bronchopneumonia with infiltration by lymphocytes and macrophages, accompanied by cellular debris and bacterial colonies within the lumen of bronchioles and alveoli (Figure 1). The granulomas (Figure 2) in the tracheobronchial lymph node were surrounded by a zone of necrosis and inflammation characterized by degenerate cells, cellular debris, dystrophic calcification and infiltration by lymphocytes, plasma cells, macrophages, multi-nucleated giant cells, and epithelioid cells. The bronchiolar epithelium is necrotic and the lumen contains neutrophils and macrophages admixed with cellular debris and bacterial colonies; alveoli spaces contain lightly pink edematous fluid admixed with lymphocytes and macrophages; chronic bronchopneumonia. (H&E stain, X200)

Bacteriological methods and Results

Discussion