Preparation of qualitative reference strains for antibiotic susceptibility determination of foodborne pathogens
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(1.College of Food Science and Engineering, Northwest A&F University, Shaanxi Yangling 712100, China;2.Yangling Quality and Technical Inspection Institute, Shaanxi Yangling 712100, China;3.Chinese Academy of Inspection and Quarantine, Beijing 100025, China;4.Hebei Food Inspection and Research Institute, Hebei Food Safety Key Laboratory, Hebei Shijiazhuang 050000, China;5.National Institutes for Food and Drug Control, Beijing 100500, China)

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    Abstract:

    Objective Based on the fact that the quality control bacteria used for bacterial drug sensitivity determination are commonly sensitive to antibiotics, while most foodborne pathogens isolated in China are relatively tolerant to these antibiotics, the concentration range of antibiotics used for antimicrobial sensitivity test is very wide, which resulting in antibiotic wastes and inaccurate test result. Methods In this study, five standard samples with clear minimum inhibitory concentration (MIC) were successfully developed for sensitivity test of common antibiotics(streptomycin, gentamicin, chloramphenicol, cefoxitin and ampicillin). Agar dilution and microbroth dilution method were respectively used to determine the susceptibility of isolates to the antibiotics, the reference strains were developed via vacuum freeze-drying. Results The reference strains with clear MICs assignment of streptomycin, gentamicin, chloramphenicol, cefoxitin and ampicillin were developed respectively. The antibiotic susceptibility of the reference strains was genetically stable, and the uniform and storage stability of them were good. When stored at 37 ℃ for 13 d, 4 ℃ for 90 d and -80 ℃ for 360 d, respectively, the viable bacteria number basically remained above 105 CFU/vial. All confirmed antibiotic resistance phenotypes could be detected, and the MICs value of the certain antibiotics did not show apparent fluctuation or drift. Conclusion The development of reference strains that in line with the characteristics of drug resistance of foodborne pathogens in China with clear MICs assignment to certain antibiotics would help to enrich the types of reference strains in China, and further strengthen the monitoring of drug-resistant bacteria to ensure food safety and public health.

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QIN Mingqian, YANG Jing, ZHAO Hongyang, LU Xingan, ZHOU Wei, CUI Shenghui, YANG Baowei. Preparation of qualitative reference strains for antibiotic susceptibility determination of foodborne pathogens[J].中国食品卫生杂志,2021,33(6):666-672.

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History
  • Received:October 29,2021
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  • Online: January 04,2022
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