患者，男，19岁。患病1周，牙龈乳头坏死，前牙唇侧明显，坏死形成溃疡处凹陷，表面灰白色假膜，触之出血明显，口腔有腐性口臭。体温37.80C，颊下淋巴结肿痛，既往未出现全身明显异常现象。对本病有辅助诊断意义的检查是

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