北京市集贸市场生鲜猪肉肠球菌种水平鉴定及耐药特征
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(1.国家食品安全风险评估中心 卫生部食品安全风险评估重点实验室,北京 100021;2.北京农学院食品科学与工程学院,北京 102206;3.中国疾病预防控制中心传染病 预防控制所,北京 102206)

作者简介:

彭子欣 女 副研究员 研究方向为食品微生物学 E-mail:pengzixin@cfsa.net.cn通信作者:┣┣(中)通信作者┫┫李凤琴 女 研究员 研究方向为食品微生物学 E-mail:lifengqin@cfsa.net.cn

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基金项目:

国家自然科学基金(31601574);中国博士后基金(2016M590072);北京青年拔尖人才(2014000021223ZK46);北京市科技新星交叉学科合作项目(Z161100004916029)


The species-level identification and antimicrobial susceptibility analysis of Enterococcus spp. of raw pork collected from a free trade market in Beijing
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Affiliation:

(1.Key Laboratory of Food Safety Risk Assessment of Ministry of Health, China National Center for Food Safety Risk Assessment, Beijing 100021, China;2.Food Science and Engineering College, Beijing University of Agriculture, Beijing 102206, China;3.National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease and Prevention, Beijing 102206, China)

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    摘要:

    评价和比较不同肠球菌种水平鉴定方法的准确性,了解北京市集贸市场生鲜猪肉肠球菌的种水平分布及耐药特征。方法 利用基质辅助激光解吸电离飞行时间质谱(MALDI-TOF-MS)和VITEK 2 COMPACT两种方法对北京市集贸市场生鲜猪肉肠球菌开展种水平鉴定,两种方法鉴定结果不一致的菌株使用API 20 Strep、16S rRNA和23S rRNA序列分析再次鉴定。比较不同种肠球菌对10种临床常用抗生素的药物敏感性。结果 在5种肠球菌种水平鉴定方法中,16S rRNA序列分析和最终结果的符合率最高,为100.0%;VITEK 2 COMPACT符合率最低,仅为4.0%(1/25)。在86株肠球菌中,粪肠球菌占82.6%(71/86),其次为希拉肠球菌占14.0%(12/86)。粪肠球菌对环丙沙星(CIP)的耐药率高于希拉肠球菌,差异有统计学意义(χ2=10.751,P<0.01);对四环素(TET)、高浓度链霉素(HLSR)和高浓度庆大霉素(HLGR)的耐药率均高于希拉肠球菌,但差异无统计学意义(TET:χ2=3.865,P>0.05;HLSR:χ2=1.608,P>0.05;HLGR:χ2=0.553,P>0.05),但对红霉素(ERY)和氯霉素(CHL)的耐药率明显低于希拉肠球菌,差异有统计学意义(ERY:χ2=20.244,P<0.01;CHL:χ2=14.139,P<0.01)。结论 16S rRNA和MALDI-TOF-MS序列分析技术在肠球菌种水平快速鉴定上有较高准确性,不同种属肠球菌呈现不同耐药特征,本研究为有效监测食源性耐药肠球菌的传播和流行提供了科学数据。

    Abstract:

    This study was to compare and assess the accuracy of species-level identification methods for Enterococcus spp., and to understand the species distribution and antimicrobial susceptibility characteristics of Enterococcus spp. collected of raw pork from a free trade market in Beijing. Methods By using matrix-assisted laser desorption/ionization time of flight mass spectrometry(MALDI-TOF-MS)and 16S rRNA gene analysis, the species of Enterococcus spp. were identified, and the inconsistent results were further identified by API 20 Strep, 16S rRNA and 23S rRNA gene analysis. Moreover, the susceptibility of isolated Enterococcus spp. to 10 antibiotics was analyzed at species level. Results Among the five identification methods, 16S rRNA gene analysis showed 100.0% consistence with the final species identification results, but the VITEK 2 COMPACT showed the lowest consistence of only 4.0%(1/25). The most prevalent species in Enterococcus spp. was Enterococcus faecalis, accounting for 82.6% (71/86) followed by Enterococcus hirae 14.0% (12/86). Enterococcus faecalis strains showed higher antimicrobial susceptibility than Enterococcus hirae to ciprofloxacin, tetracycline, high-level streptomycin and high-level gentamicin (ciprofloxacin: χ2=10.751, P<0.01; tetracycline:χ2=3.865, P>0.05; high-level streptomycin:χ2=1.608, P>0.05; high-level gentamicin:χ2=0.553, P>0.05), but showed apparently lower antimicrobial susceptibility on erythromycin and chloramphenicol than Enterococcus hirae (erythromycin:χ2=20.244, P<0.01; chloramphenicol:χ2=14.139, P<0.01). Conclusion The 16S rRNA gene analysis and MALDI-TOF-MS have higher accuracy at species level identification for Enterococcus spp.. Different species of Enterococcus spp. showed various antimicrobial susceptibility characteristics. This study was important for the effective monitoring of drug-resistant enterococci spread and prevalence.

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彭子欣,张思雨,闫韶飞,王帅,王伟,张建中,李凤琴.北京市集贸市场生鲜猪肉肠球菌种水平鉴定及耐药特征[J].中国食品卫生杂志,2017,29(3):283-288.

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  • 收稿日期:2017-03-06
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  • 在线发布日期: 2017-07-12
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