7-29. 大腸桿菌性腸炎的危害因素，包括病毒性呼吸道感染、惡劣的氣候溫度和禽舍衛生情況不良等。每天的損失率約為0.2~1%，剖檢可發現氣囊炎、肝包膜和心包膜炎。圖為蛋雞的腹膜炎。 Risk factors for colibacillosis are viral infections of the airways, poor house climate and inadequate hygiene. Losses are between 0.2 and 1% per day. Autopsy reveals inflamed air sacs, liver capsule and heart sac. Picture: peritonitis in a layer.