确定Pneumocystis jirovecii感染殖民利用基于PCR的诊断在艾滋病毒阴性个体
Anna Louise Watson1,2, John Woodford3, Sumudu Britton1
1Infectious Diseases, Royal Brisbane & Women's Hospital, Metro North Health, Herston, QLD 4006, Australia.
Diagnostics (Basel, Switzerland)
|January 11, 2024
概括
定量PCR (qPCR) 无法可靠地区分Pneumocystis jirovecii肺炎与殖民. 临床因素对于解释免疫受损患者的结果至关重要,特别是当qPCR值处于不确定的范围内时.
科学领域:
- 医学诊断 医学诊断 医学诊断
- 传染性疾病 传染性疾病
- 分子生物学分子生物学
背景情况:
- 肺囊炎 (PCP) 肺炎越来越多地被诊断为免疫功能低下,HIV阴性个体使用敏感的PCR.
- 准确区分PCP感染和殖民是适当的患者管理至关重要的.
研究的目的:
- 评估内部定量PCR (qPCR) 测定Pneumocystis jirovecii的性能.
- 为了优化对免疫功能低下,艾滋病毒阴性患者的qPCR结果的解释.
主要方法:
- 来自诱导的或BAL液体的82个阳性P. jirovecii qPCR的回顾性审计 (2012-2023年).
- 排除艾滋病毒患者;根据临床黄金标准对病例进行分类 (殖民化,高概率PCP,不确定的PCP).
- 对qPCR值的分析和与临床放射学数据和患者人口统计数据的相关性.
主要成果:
- 在临床类别 (感染与殖民) 中观察到qPCR值的显著差异.
- 截止值为2.5 × 10^5副本/毫升,产生了50%的灵敏度和83.33%的特异性.
- 尤登指数截止值为6.5 × 10^4副本/毫升,使灵敏度提高到75%,但使特异性降低到66.67%.
- 诸如70岁以上的年龄,发烧,缺氧和碎玻璃变化等因素与感染有关.
结论:
- 单个qPCR切线不足以可靠地区分P. jirovecii感染与殖民.
- 低和高的qPCR切断值都是有用的,但一个重要的"可能感染"组需要临床和放射学解释.
- 为了实现普遍化,需要对特定免疫受损群体的测试进行标准化和前性验证.
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