According to the report, this virus was never known, which had claimed countless lives, _____ it was

accidentally found by a doctor.  [ ]

A. unless

B. since

C. so that

D. until

女孩，1岁6个月，发热2天入院。体检T39．5℃，神萎，面色欠佳，心肺无异常发现，尿液分析示白细胞满视野，诊断为尿路感染及败血症。

为明确诊断需做的常规实验室检查是（）

A.尿培养

B.血培养

C.外周血白细胞

D.C反应蛋白

E.鲎试验