患儿,女,9个月,因发热微咳流涕一天,在某院门诊就医。查体:体温38℃,全身皮肤无皮疹及紫斑,鼻阻,咽部充血,诊断为“上感”给予麦迪霉素0.1,1日4次内服。服2次后患儿臀部及双下肢出现对称性大块紫斑伴高热,无腹痛及黑便。查体:T39℃,R30次/分,臀部及双下肢可见大片紫斑,其中双小腿紫斑融合成大血泡,中心发生出血性坏死。查血小板计数、出凝 Children, women, 9 months, due to fever cough runny nose one day, in a hospital for medical treatment. Physical examination: body temperature 38 ℃, no skin rashes and purpura, nasal resistance, pharyngeal hyperemia, the diagnosis of “on the flu” to give midecamycin 0.1 .1 4 times orally. After serving two times in children with hip and lower extremity symmetry purple block with fever, no abdominal pain and melena. Physical examination: T39 ℃, R30 beats / min, visible hips and lower extremities large purple, which double calf purple fusion into large blood cells, the center of hemorrhagic necrosis. Check the platelet count, a condensate