患儿男,2岁,因发热、皮疹十余天,关节疼痛5天入院。体检:体温39.4℃,心率180次/分,热病容,精神尚可,前额、腹部及四肢可见散在风团状皮疹,颈部及腹股沟可触及数枚黄豆大小淋巴结,活动、无压痛,心肺听诊正常,肝肋下1.5cm,剑下3cm,质软,脾未及。各关节无红肿。化验:血色素115g/L,白细胞总数23×10~9/L,中性0.73,淋巴 Children male, 2 years old, due to fever, rash more than ten days, joint pain 5 days admitted. Physical examination: body temperature 39.4 ℃, heart rate 180 beats / min, febrile disease, the spirit is acceptable, the forehead, abdomen and limbs visible scattered gusty rash, neck and groin can reach several soybean size lymph nodes, activity, no tenderness, cardiopulmonary auscultation Normal, liver ribs 1.5cm, 3cm under the sword, soft, spleen and time. No swelling of joints. Assay: hemoglobin 115g / L, the total number of leukocytes 23 × 10 ~ 9 / L, neutral 0.73, lymph