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.
复制标题
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:
影响因子:
--
通讯作者:
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.
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.