检验医学 ›› 2020, Vol. 35 ›› Issue (7): 716-720.DOI: 10.3969/j.issn.1673-8640.2020.07.020

• 技术研究与评价·论著 • 上一篇    下一篇

质谱技术直接鉴定报阳血培养细菌可行性分析

王军杰1, 马冰2, 李轶2, 闫文娟2, 王山梅2, 马琼2, 张江峰2, 许俊红2, 袁有华2()   

  1. 1.周口市鹿邑真源医院检验科,河南 周口 477200
    2.河南省人民医院检验科,河南 郑州 450003
  • 收稿日期:2018-11-04 出版日期:2020-07-30 发布日期:2020-08-04
  • 作者简介:null

    作者简介:王军杰,男,1993年生,学士,技师,主要从事临床微生物检验工作。

  • 基金资助:
    河南省科技攻关项目(182102310576);河南省科技攻关项目(182102310097);河南省医学科技攻关项目(201702198)

Identification of bacteria directly by MALDI-TOF MS

WANG Junjie1, MA Bing2, LI Yi2, YAN Wenjuan2, WANG Shanmei2, MA Qiong2, ZHANG Jiangfeng2, XU Junhong2, YUAN Youhua2()   

  1. 1. Department of Clinical Laboratory,Luyi Zhenyuan Hospital,Zhoukou 477200,Henan,China
    2. Department of Clinical Laboratory,Henan Provincial People's Hospital,Zhengzhou 450003,Henan,China
  • Received:2018-11-04 Online:2020-07-30 Published:2020-08-04

摘要:

目的 探讨质谱技术直接鉴定报阳血培养中细菌种类的可行性。方法 收集非重复报阳血培养瓶443个,采用质谱技术直接鉴定其中的细菌。同时采用全自动细菌鉴定仪鉴定转种后纯培养菌落。以全自动细菌鉴定仪的鉴定结果为金标准,比较质谱技术直接鉴定细菌种类的准确性。结果 443个血培养瓶中,排除7瓶假阳性瓶,质谱技术鉴定细菌的准确性以革兰阴性菌最高(92.8%),其次是革兰阳性菌(81.9%),鉴定真菌、厌氧菌的准确性分别84.2%、66.7%,少见菌鉴定准确性较低(57.1%)。结论 质谱技术能够快速、准确地直接鉴定出报阳血培养中的常见细菌,可为临床合理使用抗菌药物提供依据。

关键词: 血培养, 细菌, 血流感染, 鉴定, 质谱技术

Abstract:

Objective To investigate the feasibility of identifying bacteria directly by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry(MALDI-TOF MS). Methods A total of 443 non-repeated positive blood cultures were collected and identified directly by MALDI-TOF MS. The positive blood cultures were sub-cultivated to single bacterium colony and identified by biochemical BD testing(biochemical identification). The accuracies of direct identification for positive blood cultures by MALDI-TOF MS and biochemical identification as the gold standard were compared. Results After excluding 7 false positive samples,among 443 positive blood cultures,the accuracies of direct identification by MALDI-TOF MS were 92.8% for Gram-negative bacteria,81.9% for Gram-positive bacteria,84.2% for fungi and 66.7% for anaerobic bacteria,and the accuracy for rare bacteria was low(57.1%). Conclusions The common bacteria in positive blood cultures could be identified directly by MALDI-TOF MS,which can provide a reference for the rational use of antibiotics.

Key words: Blood culturing, Bacterium, Bloodstream infection, Identification, Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry

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