幼儿，3岁。高热3天入院。伴咽痛，轻度腹 泻。查体：咽部充血，见白色点块状分泌物，周边无红晕，易剥离。双侧结膜充血，有滤泡。耳后淋巴结黄豆大小。血常规：白细胞7.6xl0VL, L72%, N26%。该患儿最可能感染的病原体是

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