Fever, respiratory distress, and sudden death in a 10-week-old Thoroughbred colt.

**Prompt recognition and aggressive treatment of respiratory infections in young foals are crucial to prevent fatal outcomes.**

A 10-week-old Thoroughbred colt presented with fever, respiratory distress, and sudden death. Post-mortem examination revealed severe pulmonary congestion and edema, along with multifocal areas of necrosis in the lungs. Histopathological analysis identified numerous intralesional gram-negative bacteria, consistent with a diagnosis of acute bacterial pneumonia. The colt's clinical signs and pathological findings suggest a severe bacterial infection leading to rapid deterioration and death. This case underscores the importance of prompt recognition and aggressive treatment of respiratory infections in young foals to prevent fatal outcomes.

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