使用免疫染色学测试直接从阳性血液培养物中快速和低成本检测碳烯酶的算法
Patricia Del Carmen García1,2,3, Pamela Rojas3,4, Ana María Guzmán1,5
1Department of Clinical Laboratories, School of Medicine, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile.
Antibiotics (Basel, Switzerland)
|January 28, 2026
概括
快速免疫染色学 (IC) 测试在血液培养物中准确检测到卡巴酶,为qPCR提供了低成本的替代方案. 然而,NDM和OXA-48的特异性问题需要进行确认测试.
科学领域:
- 临床微生物学 临床微生物学
- 传染性疾病 传染性疾病
- 诊断测试 诊断测试 诊断测试
背景情况:
- 从血液培养 (BCs) 中检测标准的碳烯酶是耗时的 (48-72小时).
- 自动化qPCR面板提供快速结果 (1小时),但对于许多设置来说价格过高.
- 需要低成本,快速的诊断方法,直接从阳性BC检测卡巴酶.
研究的目的:
- 为了评估一种新型,低成本的免疫染色学 (IC) 试验 (K.N.I.V.O.) 的性能. 用于从阳性血液培养物中直接检测碳烯酶.
- 为了将IC测试与准确性和速度的既定参考方法进行比较.
- 评估K.N.I.V.O.的可行性. 在资源有限的环境中作为代价昂贵的qPCR方法的替代品进行测试.
主要方法:
- 使用K.N.I.V.O.分析了91个临床和64个模拟的阳性血培养. 在样本准备 (SDS处理和洗) 后进行IC试验.
- 使用NG Carba-5 IC测试和GeneXpert Carba-R qPCR进行确认测试,解决了不一致的结果.
- 计算了性能指标,包括灵敏度,特异性和预测值.
主要成果:
- 这就是K.N.I.V.O.的K.N.I.V.O. 在血液培养物中检测卡巴酶产生细菌时,IC测试显示了100%的灵敏度.
- 然而,该测试的特异性为80.8%,其中13个假阳性结果主要是NDM和/或OXA-48碳烯酶.
- 阳性和阴性预测值分别为87.0%和100%,这表明在与确认测试解释时的高可靠性.
结论:
- 这就是K.N.I.V.O.的K.N.I.V.O. IC测试是第一个在阳性血液培养物上直接使用的测试,显示了对碳烯酶检测的出色灵敏度.
- 建议对NDM和OXA-48进行实用确认算法,包括第二次IC测试或qPCR,以解决特异性限制.
- 这种测试提供了一个有价值,具有成本效益的替代方案,用于在资源较低的医疗保健环境中早期检测碳烯酶,从而有可能改善患者管理.
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