Safety Monitoring

Study on identification and phylogenetic relationship analysis methods of Staphylococcus cohnii contamination in injection*

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  • 1. Guangzhou Institute for Food Inspection, Guangzhou 511400, China;
    2. Sichuan Institute for Food and Drug Control, Chengdu 611731, China;
    3. Shanghai NOD Biotech Co., Ltd, Shanghai 201162, China;
    4. Hangzhou Digital-Micro Biotech Co., Ltd, Hangzhou 311231, China;
    5. Sichuan Center for Disease Control and Prevention, Chengdu 610041, China

Received date: 2021-03-26

  Online published: 2024-06-21

Abstract

Objective: To study on identification and phylogenetic relationship analysis methods of microbiological contamination and trace to the source of bacterial contamination A1, which was isolated from injection sterility test of a pharmaceutical company. To provide technical supports for pharmaceutical companies to improve the microbio-logical monitoring system and realize manufacturing process control of microorganism during production and inspection. Methods: A1 and 78 strains, collected in the course of this investigation, were biochemical identified by VITEK 2 Compact system. Strains belonging to the same genus as A1 were picked out to characterized identification and phylogenetic relationship analysis by several methods, such as Fourier transform infrared spectrometry (FTIR), matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS), 16S rRNA gene sequencing, ribosomal DNA typing (Ribotyping) and whole-genome sequence (WGS). The phylogenetic relationship analysis results verified by pulsed field gel electrophoresis (PFGE). Results: Except for the partial identification results of MALDI-TOF MS, the microbial identification results of several methods were identical. Phylogenetic relationship analysis results of these methods were microbial contamination A1 was traced back to the strain A2 (16S rRNA gene sequencing method traced back to subspecies this time), a strain on instrument surface in isolator used for sterility test. PFGE confirmed the analysis results. The phylogenetic relationships among species clusters might be different. Conclusion: In general, the standard procedure for phylogenetic relationships analysis of microbiological contamination includes following three steps: Firstly, biochemical identification method is adopted to identify the species of the contaminated bacteria. Secondly, microbes that are the same species as the pollution bacteria are selected from strains collected from the pollution investigation and the environmental bacterial library. And thirdly, analysis method such as 16S rRNA gene sequencing, ribotyping and WGS can be used for microbial identification and phylogenetic relationship analysis. When 16S rRNA gene sequencing is taken for phylogenetic relationship analysis, multiphase identification is suggested to use for accurate traceability, and only in this way , corrective and preventive measures can be implemented effectively.

Cite this article

SUN Xue-qi, XIAO Jian, QIN Li, CHEN Jie, CAI Hai-yi, LIU Cheng-zhi, YANG Xiao-rong, MAO Xin-wu . Study on identification and phylogenetic relationship analysis methods of Staphylococcus cohnii contamination in injection*[J]. Chinese Journal of Pharmaceutical Analysis, 2021 , 41(10) : 1764 -1774 . DOI: 10.16155/j.0254-1793.2021.10.14

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