The macroscopic lesions include severe fibrinous exudates, large amounts of turbid fluid within the pleural, pericardial, and peritoneal cavities, local lung hemorrhages and congestion of brain.

• 病理组织学表现为，肺脏、心脏、脾脏等脏器含有大量的中性粒细胞的纤维蛋白性多发性浆膜炎、脑膜炎及支气管肺炎。