检验医学 ›› 2019, Vol. 34 ›› Issue (5): 447-450.DOI: 10.3969/j.issn.1673-8640.2019.05.014

• • 上一篇    下一篇

基质辅助激光解析电离飞行时间质谱直接检测尿路感染病原菌性能评价

沈振华1, 陈蓉2   

  1. 1. 上海市浦东新区公利医院检验科,上海 200135
    2. 上海市临床检验中心,上海 200126
  • 收稿日期:2019-01-28 出版日期:2019-05-30 发布日期:2019-05-28
  • 作者简介:null
    作者简介:沈振华,男,1979年生,学士,主管技师,主要从事临床微生物检测工作。
  • 基金资助:
    浦东新区卫生系统重点学科群建设资助项目(PWZxq2017-15);河南省科技厅横向联合项目(181200211900)

Performance evaluation for the direct detection of pathogenic bacteria causing urinary tract infection by

MALDI-TOF MS SHEN Zhenhua1, CHEN Rong2   

  1. 1. Department of Clinical Laboratory,Shanghai Pudong Gongli Hospital,Shanghai 200135,China
    2. Shanghai Center for Clinical Laboratory,Shanghai 200126,China
  • Received:2019-01-28 Online:2019-05-30 Published:2019-05-28

摘要:

目的 探讨基质辅助激光解析电离飞行时间质谱(MALDI-TOF MS)直接检测尿路感染病原菌的性能。方法 收集1 000例门诊及住院患者中段尿样本,接种于固体培养基,采用MALDI-TOF MS仪和全自动微生物鉴定系统对单个菌落进行鉴定;对中段尿样本进行前处理后直接采用MALDI-TOF MS仪进行分析。结果 1 000例中段尿样本中,培养法检出215例菌落计数≥105 CFU/mL的细菌,阳性检出率为21.5%;其中162例分离到单一细菌,53例分离到混合细菌。2种仪器对215株细菌鉴定结果的符合率达100%。 革兰阴性杆菌占76.3%,革兰阳性菌占23.7%。MALDI-TOF MS仪直接检测检出185例菌落计数≥105 CFU/mL的细菌,阳性检出率为18.5%;其中145例分离到单一细菌,40例分离到混合细菌。直接检测法无假阳性,但阳性检出率较培养法低,阳性漏检率达到14.0%(30/215)。结论 采用MADLI-TOF MS仪直接检测感染性中段尿样本,具有鉴定诊断时间短、成本低和适用性好的优点。

关键词: 基质辅助激光解析电离飞行时间质谱, 尿路感染, 病原菌

Abstract:

Objective To investigate the role of matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS) in the detection of pathogenic bacteria causing urinary tract infection. Methods A total of 1 000 midstream urine samples were collected and inoculated on solid media. Single colonies were identified by MALDI-TOF MS and Vitek 2 Compact. Midstream urine samples were directly detected by MALDI-TOF MS after pretreatment. Results Among the 1 000 midstream urine samples,215 cases with colony count ≥105 CFU/mL were detected by culture method,and the positive detection rate was 21.5%. Among them,there were 162 cases isolated with single bacterium and 53 cases with mixed bacteria. The consistency rate for the identification of 215 cases by MALDI-TOF MS and Vitek 2 Compact was 100 %. Gram-negative bacteria accounted for 76.3%. Gram-positive bacteria accounted for 23.7%. Totally,185 cases with colony count ≥105 CFU/mL were detected by MALDI-TOF MS directly,and the positive detection rate was 18.5%. Among them,145 cases of single bacterium were isolated,and 40 cases of mixed bacteria were found. The direct detection method had no false positive case. The positive detection rate was lower than that of culture method,and the positive leakage rate reached 14.0 %(30/215). Conclusions MALDI-TOF MS for the direct detection of pathogenic bacteria from infectious midstream urine samples has the advantages of short identification and diagnosis time, low cost and good applicability.

Key words: Matrix-assisted laser desorption/ionization time of flight mass spectrometry, Urinary tract infection, Pathogenic bacterium

中图分类号: