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Long-term survival of the Shiga toxin-producing Escherichia coli O104:H4 outbreak strain on fenugreek seeds

机译：产生志贺毒素的大肠杆菌O104：H4暴发菌株在胡芦巴种子上的长期存活

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摘要

A major outbreak of Shiga toxin-producing Escherichia coli (STEC) O104:H4 occurred in Germany in 2011. The epidemiological investigation revealed that a contaminated batch of fenugreek seeds (Trigonella foenum-graecum) was the most probable source of the pathogen. It was suggested that the most probable point of contamination was prior to leaving the importer, meaning that the seed contamination with STEC O104:H4 should have happened more than one year before the seeds were used for sprout production. Here, we investigated the capacity of STEC O104:H4 and closely related pathogenic as well as non-pathogenic Escherichia coli strains for long-term survival on dry fenugreek seeds. We did not observe a superior survival capacity of STEC O104:H4 on dry seeds. For none of the strains tested cultivatable cells were found without enrichment on contaminated seeds after more than 24 weeks of storage. Our findings suggest that contamination previous to the distribution from the importer may be less likely than previously assumed. We show that seeds contaminated with E. coli in extremely high numbers can be completely sterilized by a short treatment with bleach. This simple and cheap procedure does not affect the germination capacity of the seeds and could significantly improve safety in sprout production.
机译：2011年，德国发生了一次大规模的产志贺毒素的大肠杆菌O104：H4爆发。流行病学调查显示，受污染的胡芦巴种子（胡芦巴）是该病原体最可能的来源。有人提出，最可能的污染点是在离开进口商之前，这意味着用STEC O104：H4进行的种子污染应该在种子用于发芽生产之前已经发生了一年多。在这里，我们调查了STEC O104：H4和密切相关的致病性及非致病性大肠杆菌菌株在胡芦巴干种子上的长期生存能力。我们没有观察到STEC O104：H4在干燥种子上的优越生存能力。对于所有测试菌株，在储存超过24周后，没有发现可培养细胞未富集在受污染的种子上。我们的研究结果表明，进口商分配之前的污染可能比以前设想的要少。我们表明，用短时间的漂白剂处理就可以完全消毒绝大部分被大肠杆菌污染的种子。这种简单而廉价的程序不会影响种子的发芽能力，并且可以显着提高芽苗生产的安全性。

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  • 来源
    《Food microbiology》 |2016年第10期|190-195|共6页
  • 作者

    Michael Knoedler; Michael Berger; Ulrich Dobrindt;

  • 作者单位

    Institute of Hygiene, University Muenster, Muenster, Germany;

    Institute of Hygiene, University Muenster, Muenster, Germany;

    Institute of Hygiene, University of Muenster, Mendelstrasse 7, 48149 Muenster, Germany;

  • 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
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