Diagnosis: Fibrinosuppurative necrotizing bronchopneumonia with fibrinous pleuritis etiology consistent with Mannheimia haemolytica.
Cause: Mannheimia haemolytica

A commercial cow-calf herd had an acute death in mature cows. Approximately eighteen head of various age cows with two deaths in the past couple weeks. Clinical signs included depression, droopy ears, nasal and oral discharge, diarrhea, and poor body condition. Two cows were euthanized. At necropsy, the pleura was diffusely thickened with fibrinous pleuritis. The cranioventral lung lobes were diffusely and markedly firm with fibrinosuppurative necrotizing bronchopneumonia. The histologic changes had multifocal areas of coagulative necrosis, rimmed by a dense basophilic band of oat-like cells. The submitted lung lobes had a heavy growth of Mannheimia haemolytica.

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Uploaded on: 2022-02-02