女孩，2岁。高热伴咽痛4天，伴流涎、厌食。查体：体温39. 8℃，咽部充血，软腭和悬雍垂处可见数个2mm大小灰白色疱疹及溃 疡。肺呼吸音粗糙，无啰音。血常规：白细胞8.1x109/L，L 58%, N 42%。该患儿最可能感染的病原体是

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