Laboratory Medicine ›› 2015, Vol. 30 ›› Issue (2): 122-127.DOI: 10.3969/j.issn.1673-8640.2015.02.005

• Orignal Article • Previous Articles     Next Articles

Comparison on the identification abilities of MicroflexTM MALDI-TOF MS and Vitek 2 Compact automatic microbial analysis system for Enterobacteriaceae

LIU Ying, YU Jing, CHENG Feng, LIU Jingxian, LI Yuanrui, HUANGFU Yuchan, SHEN Lisong   

  1. Department of Clinical Laboratory,Xinhua Hospital,Shanghai Jiaotong University School of Medicine,Shanghai 200092,China
  • Received:2014-10-20 Online:2015-02-28 Published:2015-02-12

Abstract: Objective

To compare the identification abilities of MicroflexTM matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS) and Vitek 2 Compact automatic microbial analysis system (Vitek 2 Compact) for Enterobacteriaceae.

Methods

A total of 545 isolates of Enterobacteriaceae from a variety of clinical and quality control isolates were identified by MicroflexTM MALDI-TOF MS and Vitek 2 Compact. The isolates were confirmed by 16S rDNA gene sequencing, and Salmonella was identified by serum agglutination test, if the identification results of the 2 systems didn't match.

Results

The coincidence rates of 545 isolates of Enterobacteriaceae identified by MicroflexTM MALDI-TOF MS were 97.1% to the species level and 2.9% to the genus level,respectively. The coincidence rates of 545 isolates of Enterobacteriaceae identified by Vitek 2 Compact were 83.3%,13.9% and 2.2% to the species, group and genus levels, respectively. The false rate was 0.2%, and the un-identification rate was 0.4%.

Conclusions

The identification coincidence rate of Enterobacteriaceae by MicroflexTM MALDI-TOF MS is higher than that of Vitek 2 Compact. Using MicroflexTM MALDI-TOF MS to identify Enterobacteriaceae is fast,simple to operate and low-cost,and it can be used in routine rapid identification of Enterobacteriaceae in clinical microbiology laboratories.

Key words: Matrix-assisted laser desorption/ionization-time of flight mass spectrometry, Enterobacteriaceae, Identification

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