Characterization of enterohemorrhagic Escherichia coli O111 and O157 strains isolated from outbreak patients in Japan.

Characterization of enterohemorrhagic Escherichia coli O111 and O157 strains isolated from outbreak patients in Japan.
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从日本疫情患者中分离出的肠出血性大肠杆菌 O111 和 O157 菌株的特征。

DOI:
10.1128/jcm.00420-14
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发表时间:
2014
期刊:
J Clin Microbiol.
影响因子:
--
通讯作者:
Sata T.
Sata T.
中科院分区:
--
文献类型:
--
作者:
Watahiki M;Isobe J;Kimata K;Shima T;Kanatani J;Shimizu M;Nagata A;Kawakami K;Yamada M;Izumiya H;Iyoda S;Morita-Ishihara T;Mitobe J;Terajima J;Ohnishi M;Sata T.

文献摘要

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2011年4月和5月,日本爆发了严重的食物中毒事件,由一家烧烤店分店的生牛肉菜肴中的肠出血性大肠杆菌(EHEC)菌株O111:H8和O157:H7引起。此次疫情涉及 181 名感染者,其中溶血尿毒症综合征 (HUS) 病例 34 例(19%)。 34 名 HUS 患者中,21 人出现急性脑病(AE),5 人死亡。患者粪便标本中发现大肠杆菌 O111 和 O157 菌株。我们还在餐厅的肉块库存中检测到了 EHEC O111stx2 和 stx 阴性大肠杆菌 O111 菌株。脉冲场凝胶电泳(PFGE)和多位点可变数量串联重复分析(MLVA)表明stx阴性大肠杆菌O111分离株与EHEC O111stx2分离株密切相关。尽管 EHEC O157 菌株具有不同的 stx 基因谱(stx1、stx2 和 stx1stx2),但 PFGE 和 MLVA 分析表明这些分离株源自单个克隆。在体外生长过程中,经常观察到 EHEC O111stx2 分离株中 Stx2 转化前噬菌体的缺失,这表明在感染过程中可能发生了从 EHEC O111stx2 菌株向 anstx 阴性菌株的转化。
In April and May 2011, there was a serious food-poisoning outbreak in Japan caused by enterohemorrhagic Escherichia coli (EHEC) strains O111:H8 and O157:H7 from raw beef dishes at branches of a barbecue restaurant. This outbreak involved 181 infected patients, including 34 hemolytic-uremic syndrome (HUS) cases (19%). Among the 34 HUS patients, 21 developed acute encephalopathy (AE) and 5 died. Patient stool specimens yielded E. coli O111 and O157 strains. We also detected both EHEC O111stx2andstx-negative E. coli O111 strains in a stock of meat block from the restaurant. Pulsed-field gel electrophoresis (PFGE) and multilocus variable-number tandem-repeat analysis (MLVA) showed that thestx-negative E. coli O111 isolates were closely related to EHEC O111stx2isolates. Although the EHEC O157 strains had diversestxgene profiles (stx1,stx2, andstx1stx2), the PFGE and MLVA analyses indicated that these isolates originated from a single clone. Deletion of the Stx2-converting prophage from the EHEC O111stx2isolates was frequently observed duringin vitrogrowth, suggesting that strain conversion from an EHEC O111stx2to anstx-negative strain may have occurred during infection.