By the microscope, we can see granular degeneration, fatty degeneration and putrescence in liver, fatty degeneration in kidney, uric acid salt sediment in small pipe of kidney, thymus, bursa of Fabricius spleen are not developed well; 镜检肝脏普遍发生颗粒变性、脂肪变性及灶状坏死病变,肾小管上皮细胞变性坏死,肾小管内大量尿酸盐沉积,胸腺、传染性法氏囊、脾脏等免疫器官发育不良;