食源性致病菌药敏性检测用参考菌株的研制
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(1.西北农林科技大学 食品科学与工程学院,陕西 杨凌 712100;2.杨凌质量技术检测检 验所,陕西 杨凌 712100;3.中国检验检疫科学研究院,北京 100025;4.河北省食品检 验研究院,河北 石家庄 050000;5.中国食品药品检定研究院,北京 100500)

作者简介:

秦明倩 女 硕士生 研究方向为食品安全与食源性致病菌防控 E-mail: 18733022526@163.com 杨保伟 男 教 授 研究方向为食品安全与食源性致病菌防控 E-mail: ybwsheng@nwafu.edu.cn 崔生辉 男 研究员 研究方向为微生物检测技术 E-mail: cuishenghui@aliyun.com

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“十三五”国家重点研发计划重点专项(2017YFC1601400)


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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    摘要:

    目的 鉴于当前食源性致病菌药敏性测定用质控菌对常用抗生素较敏感,而我国分离的大部分菌株对常用抗生素较耐受,药敏性测定时需选择的抗生素浓度范围非常大,导致抗生素浪费,测试结果不准确。方法 本研究研制了5种抗生素最小抑菌浓度(Minimum Inhibitory Concentration, MIC)赋值明确、可用于食源性致病菌(乌普萨拉沙门氏菌、苏卜拉沙门氏菌、汤普森沙门氏菌、印第安纳沙门氏菌、肠炎沙门氏菌)对常见抗生素(链霉素、庆大霉素、氯霉素、头孢西丁、氨苄西林等)药敏性检测用的菌株标准样品。采用琼脂稀释法和微量肉汤稀释法测定菌株的药敏性,使用真空冷冻干燥方法制备参考菌株标准样品。结果 分别研制得到链霉素、庆大霉素、氯霉素、头孢西丁、氨苄西林MICs赋值明确的参考菌株,菌株药敏性遗传稳定、均匀性和贮存稳定性良好。分别在37 ℃、4 ℃和-80 ℃条件下贮存13、90、360 d后,活菌量基本维持在105 CFU/瓶以上,确定的耐药表型均可检出,抗生素MICs值未出现较大波动或漂移。结论 符合我国食源性致病菌耐药特性、抗生素MICs赋值明确菌株标准样品的研制,将有助于丰富我国参考菌株种类,可以进一步加强耐药菌监测,确保食品安全。

    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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秦明倩,杨静,赵红阳,卢行安,周巍,崔生辉,杨保伟.食源性致病菌药敏性检测用参考菌株的研制[J].中国食品卫生杂志,2021,33(6):666-672.

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  • 收稿日期:2021-10-29
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  • 在线发布日期: 2022-01-04
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