案例：患者，男性，30岁。因重症肺炎行机械通气2周，体温正常5天，最近又发热3天，体温38.5〜39℃。查体：双下肺可闻及散在湿啰音，气道分泌物为黄色黏痰，右颈内静脉置管部位皮肤红肿、硬结，无脓液渗出。对明确诊断最有价值的检查是

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