患儿男，11岁，来自农村，因发热、全身酸痛、乏力5天于9月入院。査体：T39.50C，P124次/分，R40次/分，眼结合膜充血，腋下及腹股沟扪及数个约lcmxlcm大小的淋巴结,有轻压痛，肝肋下3.0cm,质软。腓肠肌轻压痛，肾区叩击痛，外周血WBC12.5xlO9/L,中性0.84,尿常规：尿蛋白（+)，WBC2-3个/HP，RBC3-5个/HP。病原治疗的首选药物是

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