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Biocide and antibiotic resistance of Enterococcus faecalis and Enterococcus faecium isolated from the swine meat chain

机译：从猪链分离的粪肠球菌和粪肠球菌的杀菌剂和抗生素抗性

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摘要

In this study nine strains of Enterococcus faecalis and 12 strains of Enterococcus faecium, isolated from different sample types in the swine meat chain and previously characterized for the presence of antibiotic resistance genes, were examined for phenotypic tolerance to seven biocides (chlorexidine, ben-zalkonium chloride, triclosan, sodium hypochlorite, 2-propanol, formaldehyde and hydrogen peroxide) and resistance to nine antibiotics (ampicillin, vancomycin, gentamicin, kanamycin, streptomycin, erythromycin, clindamycin, tetracycline and chloramphenicol). Moreover, the presence of efflux system encoding genes qacA/B, qacC, qacE, qacEΔ1, emeA, and stress response genes, sigV and gsp65, involved in the tolerance to biocides, was analysed. Most strains were not tolerant to the biocides, but showed minimum inhibitory concentrations (MICs) higher than the recommended cut-off values for all the antibiotics tested, except for vancomycin and chloramphenicol. Only weak correlations, if any, were found between biocide and antibiotic resistance data. One E. faecalis strain was tolerant to triclosan and one E. faecium strain, with higher tolerance to chlorexidine than the other strains tested, was found to carry a qacA/B gene. Our results indicated that phenotypic resistance to antibiotics is very frequent in enterococcal isolates from the swine meat chain, but phenotypic tolerance to biocides is not common. On the other hand, the gene qacA/B was found for the first time in the species E. faecium, an indication of the necessity to adopt measures suitable to control the spread of biocide resistance determinants among enterococci.
机译：在这项研究中，检查了从猪肉链中不同样品类型中分离出来的9株屎肠球菌和12株屎肠球菌的菌株，这些菌株先前已表征了抗生素抗性基因的存在，并检查了它们对7种杀生物剂（氯西定，本-扎库仑）的表型耐受性。氯，三氯生，次氯酸钠，2-丙醇，甲醛和过氧化氢）和对九种抗生素（氨苄青霉素，万古霉素，庆大霉素，卡那霉素，链霉素，红霉素，克林霉素，四环素和氯霉素）的耐药性。此外，分析了编码基因qacA / B，qacC，qacE，qacEΔ1，emeA的外排系统以及涉及对杀生物剂的耐受性的应激反应基因sigV和gsp65的存在。大多数菌株对杀生物剂都不耐受，但对所有测试的抗生素（万古霉素和氯霉素除外）的最低抑菌浓度（MIC）均高于建议的临界值。在杀生物剂和抗生素耐药性数据之间只有微弱的相关性（如果有）。发现一株粪肠球菌对三氯生具有耐受性，并且发现一株对氯己定具有更高耐受性的粪肠球菌菌株携带qacA / B基因。我们的研究结果表明，猪链球菌肠球菌中对抗生素的表型耐药性非常常见，但对杀生物剂的表型耐受性并不常见。另一方面，在粪肠球菌中首次发现了基因qacA / B，这表明有必要采取适当的措施来控制杀菌剂抗性决定簇在肠球菌之间的传播。

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  • 来源
    《Food microbiology》 |2016年第12期|160-164|共5页
  • 作者

    Lucia Rizzotti; Franca Rossi; Sandra Torriani;

  • 作者单位

    Dipartimento di Biotecnologie, Universita degli Studi di Verona, Strada Le Grazie 15, 37134, Verona, Italy;

    Dipartimento di Biotecnologie, Universita degli Studi di Verona, Strada Le Grazie 15, 37134, Verona, Italy;

    Dipartimento di Biotecnologie, Universita degli Studi di Verona, Strada Le Grazie 15, 37134, Verona, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Enterococci; Biocide tolerance; qac genes; Stress response genes;

    机译：肠球菌;杀菌剂耐受性;qac基因应激反应基因;

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