男孩，3岁，高热2周。査体；咽充血，颈部淋巴结肿大明显，最大达2cmx2.5cm，肝肋下3cm,脾肋下2cm,皮肤可见少量充血性丘疫。血常规：Hb78g/L，WBC19x109/L,PLT50x109/L。可能的诊断是

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