通过使用MALDI-TOF MS识别Clostridioides difficile的PCR-ribotype 017系隔离物
Yumiko Matsuyama1, Mitsutoshi Senoh2, Hiroshi Miyamoto1
1Division of Microbiology, Department of Pathology and Microbiology, Faculty of Medicine, Saga University, Saga, Japan.
Anaerobe
|November 15, 2025
概括
使用MALDI-TOF MS的新快速方法可以识别像RT369这样的Clostridioides difficile菌株,它们是毒素A阴性,B阳性和CDT阴性. 这种技术为检测这些引起疫情的C. difficile菌株提供了100%的灵敏度和特异性.
科学领域:
- 微生物学 微生物学
- 传染性疾病 传染性疾病
- 诊断技术 诊断技术的使用
背景情况:
- Clostridioides difficile RT017系,其特征是毒素A负,B阳性和二进制毒素负 (A−B+CDT−),在亚洲普遍存在.
- 在日本,多药耐药的RT369菌株已经取代了RT017在这个血统中,导致了严重的疫情.
研究的目的:
- 开发和评估一种用于识别A−B+C的快速方法. 使用矩阵辅助激光吸附离子化飞行时间质谱法 (MALDI-TOF MS) 的困难菌株.
- 具体目标是检测在日本爆发的新兴RT369菌株.
主要方法:
- 分析了79种有毒的Clostridioides difficile分离物,包括37种A−B+CDT−菌株和42种具有其他毒素配置的分离物.
- 使用MALDI-TOF MS检测特定质量与电荷比率 (m/z) 峰值,表明A−B+CDT−毒素配置.
主要成果:
- 在所有37个A−B+CDT−分离物中,包括22个RT369菌株中,在m/z 3289和3245处始终检测到明显的峰值.
- 在42个非A-B+CDT-隔离物中没有观察到这样的峰值.
- 马尔迪-托夫MS方法证明了100%的灵敏度和特异性,用于识别A-B+CDT-C. difficile.
结论:
- MALDI-TOF MS提供了一种快速而准确的方法来识别RT017血统,包括与疫情相关的RT369菌株 (A−B+CDT−).
- 这种技术可以整合到常规的实验室识别过程中,以改善C. difficile监测.
- 培养介质的变化没有影响MALDI-TOF MS结果对C. difficile鉴定的可靠性.
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