实时聚合酶链反应 (PCR) 在下呼吸道样本中检测Pneumocystis jirovecii
Federica Anna Maria Giardina1, Marina Ramus2, Francesca Campanini2
1Department of Clinical, Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy.
Microbiology spectrum
|November 6, 2025
概括
定量实时PCR (qPCR) 可以通过区分感染和殖民来准确诊断Pneumocystis jirovecii肺炎 (PjP). 经过验证的截止值可以提高诊断性能,支持PjP的临床评估.
科学领域:
- 医学诊断 医学诊断 医学诊断
- 菌类学 菌类学是指菌类学.
- 传染性疾病 传染性疾病
背景情况:
- 微观检查 (ME) 是诊断Pneumocystis jirovecii肺炎 (PjP) 的黄金标准.
- 定量实时PCR (qPCR) 显示PjP患者的DNA拷贝数量高于被殖民个体,但缺乏标准化.
- 区分PjP感染与殖民需要一种标准化的分子方法,具有定义的切断值.
研究的目的:
- 为了比较Pneumocystis ELITe MGB Kit qPCR测定与ME用于PjP诊断.
- 评估qPCR的特异性,敏感性和能力,以区分PjP感染与殖民.
- 通过使用qPCR.确定PjP诊断的切断值.
主要方法:
- 通过直接ME和qPCR分析了163个支气管支气管洗 (BAL) 或唾液样本.
- 使用Pneumocystis ELITe MGB套件进行qPCR分析.
- 执行接收器操作特征 (ROC) 曲线分析以确定最佳切断值.
主要成果:
- 在63个ME阳性样本中,ME和qPCR之间的结果一致.
- 在100个ME阴性样本中,21%的样本通过qPCR检测出阳性,表明潜在的殖民或早期感染.
- 150个DNA副本/10^5个细胞的切断值实现了100%的灵敏度和99%的PjP诊断特异性.
结论:
- qPCR,特别是具有正常化DNA负载的qPCR,为PjP诊断提供了一种标准化和高度敏感的方法.
- 确定的切断值有助于区分PjP感染与殖民.
- 除了临床评估,qPCR可以成为准确的PjP诊断和治疗的宝贵工具.
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