28岁，男性。近半年来反复上腹中部、剑突下隐痛。体型偏瘦，无黑便，疑似幽门螺杆菌感染；行胃镜观察，发现幽门周围有3个约0.2～0.3cm浅表炎性灶，取一小块炎性区域的胃黏膜组织进行下列哪种快速诊断

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