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首页> 外文期刊>Food microbiology >Control of Listeria monocytogenes contamination in an Iberian pork processing plant and selection of benzalkonium chloride-resistant strains
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Control of Listeria monocytogenes contamination in an Iberian pork processing plant and selection of benzalkonium chloride-resistant strains

机译：控制伊比利亚猪肉加工厂中的单核细胞增生性李斯特菌污染和选择耐苯扎氯铵的菌株

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摘要

The aims of this study were to characterize the different strains of Listeria monocytogenes collected at an Iberian pork processing plant and to investigate whether their specific characteristics were associated with prolonged survival in the plant. Using pulsed-field gel electrophoresis (PFGE), 29 PFGE types were previously identified during a three-year period. Eight of these PFGE types persisted in the plant during that period. In the present study, a subset of 29 PFGE type strains, which represented the 29 different PFGE types, was further characterized by assessing the potential virulence, and using motility, surface attachment, and antimicrobial susceptibility tests. After changing the disinfection procedures in the plant, the isolation rate of L. monocytogenes decreased, and only four of the 29 PFGE types, including three of the eight persistent PFGE types, were found the following year. These four "surviving" PFGE types included three from PCR serogroup IIa that were characterized by their low virulence mutations and low-level resistance to benzalkonium chloride (BAC). Furthermore, these PFGE types comprised the only BAC-resistant isolates found in the study, and they appear to have been selected due to the control of Listeria contamination. The resistance to increased sublethal concentrations of disinfectants may lead to prolonged survival of L. monocytogenes in food plants.
机译：这项研究的目的是表征在伊比利亚猪肉加工厂收集的李斯特菌李斯特菌的不同菌株，并调查其特定特征是否与植物的长期存活有关。使用脉冲场凝胶电泳（PFGE），以前在三年期间已识别出29种PFGE类型。在此期间，其中有八种PFGE类型存在于工厂中。在本研究中，代表29种不同PFGE类型的29种PFGE型菌株的一个子集通过评估潜在毒力并使用运动性，表面附着性和抗菌药敏试验进一步表征。在改变了工厂的消毒程序后，单核细胞增生李斯特氏菌的分离率下降了，第二年发现29种PFGE类型中只有4种，包括8种持久性PFGE类型中的3种。这四种“存活”的PFGE类型包括来自PCR血清群IIa的三种，其特征在于它们的低毒力突变和对苯扎氯铵（BAC）的低水平抗性。此外，这些PFGE类型仅是研究中发现的BAC抗性分离株，并且由于控制李斯特菌污染而似乎已被选择。对消毒剂亚致死浓度升高的抵抗力可能导致食用植物中单核细胞增生李斯特菌的存活时间延长。

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