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患者,女性,寒战高热,伴有腹泻,大便性状开始为稀水样便,后为脓血便,大便常规:白细胞15/HP,红细胞10/HP,脓液(+)。若明确诊断,需做下列哪项检查()
A . 血常规
B . 尿常规
C . 血培养
D . 粪便培养
E . 腹部立位平片
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