本文通过四例新生儿鼠伤寒尸解所见,发现胸腺呈明显急性退化,胸腺皮质、脾小体周围及淋巴结内淋巴滤泡周围的淋巴细胞明显减少,脑、肺、肾肝、肠等器官呈程度不一的出血坏死,提示婴幼儿所以发病率高、病情重,死亡率高与胸腺机能不足,特别是胸腺急性退化所致之免疫机能极度低下有关。 This article through the four neonatal murine pathological findings of the anaesthetize found that the thymus was significantly acute degeneration, thymus cortex, around the spleen and lymph nodes around the lymphoid follicles significantly reduced lymphocytes, brain, lung, kidney, intestine and other organs The degree of hemorrhagic necrosis, suggesting that infants and young children so high incidence, serious illness, high mortality and lack of function of the thymus, especially the acute degeneration of the thymus caused by the extremely low immune function.