患者，男，29岁。发热10天，食欲减退，乏力，腹泻，腹胀。起病后曾先后自服氨苄西林及喹诺酮类等药，发热仍不退。体检:腹部胀气，脾肋下1cm。血WBC2.6x109/L。高度怀疑伤寒，为进一步确诊，应检査

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