患者男，42岁，农民。因“发热伴腹胀2周” 就诊。近1周体温持续39〜40°C，高热时脉搏 80次/分。有青霉素过敏史。查体：肝肋下 2cm可触及，脾不大。血常规：WBC3 . 1 x 109/L，N 0 . 49，嗜酸性粒细胞0。入院后第2天出现鲜血便，伴头昏、心悸、冷汗,当时测血压85/50mmHg。如就诊前已使用抗生素治疗，则确诊适合 选择哪种细菌学检査

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