1　病历简介男 ,2 4岁。因发热 2 2天 ,血便 1天入院。患者于 2 2天前无诱因发热。全身乏力 ;体温 37～ 39.8℃ ;其他无异常。于入院前 1天 ,体温升至 39.8℃ ,伴血便 5～ 6次 / d,共约 15 0 0g;伴头晕、眼花 ,在当地医院检查肝、脾大 ,白细胞减少 ,经抗感染、输血后症状未缓解 1 medical records male, 24 years old. 2 days due to fever, bloody stools admitted to hospital for 1 day. The patient had no incentive to fever for 2 2 days. Malaise; body temperature 37 ~ 39.8 ℃; other no abnormalities. One day before admission, body temperature rose to 39.8 ℃, accompanied by bloody stool 5-6 times / d, a total of about 15 0g; with dizziness, vertigo, check the local hospital liver, splenomegaly, leukopenia, anti-infective, transfusion The symptoms did not ease