Abstract
A 7‐month‐old Quarter horse colt developed acute diarrhea, laminitis, bilateral uveitis, and severe respiratory distress after intramuscular injection with a bacterial vaccine. Thoracic radiographs revealed diffuse unstructured, nodular interstitial, and peribronchial opacities throughout the lung. Despite intensive supportive therapy, the colt became progressively hypoxemic and died. At postmortem examination, severe multifocal to coalescing hemorrhagic, necrotizing fibrinous pneumonia was found. Histologic study revealed numerous branched septate fungal hyphae diffusely distributed throughout the lung parenchyma. Fungal culture of lung tissue grew Aspergillus fumigatus. This report presents the radiographic, clinical, and pathologic features of acute mycotic pneumonia in horses.
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