患儿女,9个月,彝族。因发热伴四肢紫癜1d入院。患儿于1d前开始发热,38℃。在当地医院肌注青霉素、柴胡及地塞米松后体温下降,约2h后患儿双下肢出现皮肤瘀点、瘀斑,很快融合成片,呈紫红色,分布在臀部以下及双上肢,半天前面部亦出现类似瘀斑,两侧对称。同时,患儿烦躁、哭闹,尿少, Children with children, 9 months, Yi. Due to fever with limbs purpura 1d admission. Children in 1d before starting fever, 38 ℃. In the local hospital after intramuscular penicillin, Bupleurum and dexamethasone body temperature decreased, about 2h after the lower limbs of children with skin petechia, ecchymosis, quickly fused into tablets, was purple, located in the buttocks and below the upper extremities, Similar facial petechiae also appear half a day ago, symmetrical on both sides. At the same time, children irritability, crying, oliguria,