患儿男，7岁。2周前发热，T390C，咽痛，鼻塞，流涕，全身酸痛，治疗1周，痊愈。1天前晨起牙龈出血，不易止。体检：体温正常，无贫血貌，全身皮肤布满针尖大小出血点，无骨压痛，肝脾肋下未触及；Hb128g/L,WBC8.4x109/L,分类正常。血小板20x109/L。该患儿最可能的诊断是

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