Histopathological changes were hyperemia and edema of meninges, necrosis and inflamation of mucous menbrane of esophagus, crop and duodenum, and degeneration and necrosis of the parenchymal cells of heart, liver and kidney. 主要病理学变化为脑膜充血、水肿,食道、嗉囊及十二指肠粘膜坏死和炎症,心、肝、肾等脏器实质细胞变性及坏死。