Prevalence and antimicrobial resistance of Shigella flexneri serotype 2 variant in China.

Prevalence and antimicrobial resistance of Shigella flexneri serotype 2 variant in China.
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中国福氏志贺菌血清2型变种流行情况及耐药性

DOI:
10.3389/fmicb.2015.00435
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发表时间:
2015
影响因子:
5.2
通讯作者:
Song H
Song H
中科院分区:
生物学2区
文献类型:
--
作者:
Cui X;Wang J;Yang C;Liang B;Ma Q;Yi S;Li H;Liu H;Li P;Wu Z;Xie J;Jia L;Hao R;Wang L;Hua Y;Qiu S;Song H

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福氏志贺菌血清2型变异株(II:3,4,7,8)于2008年分离,2013年在中国首次报告。在本研究中,2003年至2013年中国的流行病学监测表明,该血清型于2003年首次出现在广西,随后于2004年在上海和新疆以及2008年在河南出现。1813年S.福氏志贺菌58株。鉴定了福氏血清型2变异株。血清2型变异是近年来出现的主要血清型,2a(32.6%)、X变异(25.2%)、1a(9.4%)、X(6.3%)、2b(5.4%)和1b(3.6%)。根据表型和基因型分析,血清2型变异起源于2a至2b。2009年至2013年的抗生素耐药率高于2003年至2008年。在22株头孢菌素耐药菌株中,检出blaTEM-1、blaOXA-1、blaCTX-3、blaCTX-14和blaCTX-79。在22株氟喹诺酮类耐药菌株中,所有菌株均存在parC的Ser 80 Ile突变。此外,21个分离株有三个gyrA点突变(Ser 83 Leu,His 211 Tyr,Asp 87 Asn或Gly),1个分离株有两个gyrA点突变(Ser 83 Leu和His 211 Tyr)。His 211 Tyr在氟喹诺酮类药物耐药菌株中的流行情况令人担忧,该突变在国内首次报道。此外,22株菌株携带aac(6′)-Ib-cr基因,2株菌株携带qnrS 1基因。鉴于流行频率的增加和多重耐药菌株的出现,将需要持续监测,以了解实际的疾病负担,并为志贺氏菌病提供指导。
Shigella flexneri serotype 2 variant (II:3,4,7,8) was isolated in 2008 and first reported in China in 2013. In the present study, epidemiological surveillance from 2003 to 2013 in China suggested that this serotype first appeared in Guangxi in 2003; it then emerged in Shanghai and Xinjiang in 2004 and in Henan in 2008. Of the 1813 S. flexneri isolates, 58 S. flexneri serotype 2 variant strains were identified. Serotype 2 variant has emerged as a prominent serotype in recent years, with 2a (32.6%), X variant (25.2%), 1a (9.4%), X (6.3%), 2b (5.4%), and 1b (3.6%). According to phenotypic and genotypic analysis, the serotype 2 variant originated from 2a to 2b. A higher antibiotic resistance rate was observed between 2009 and 2013 than that between 2003 and 2008. Among 22 cephalosporin-resistant isolates, blaTEM-1, blaOXA-1, blaCTX-3, blaCTX-14, and blaCTX-79 were detected. Among 22 fluoroquinolone-resistant isolates, a Ser80Ile mutation in parC was present in all of the isolates. Moreover, 21 isolates had three gyrA point mutations (Ser83Leu, His211Tyr, Asp87Asn, or Gly) and one isolate had two gyrA point mutations (Ser83Leu and His211Tyr). The prevalence of His211Tyr in the fluoroquinolone-resistant isolates is concerning, and the mutation was first reported in China. Besides, 22 isolates harbored the aac(6′)-Ib-cr gene, and two isolates harbored qnrS1. In view of the increased epidemic frequency and multidrug-resistant strain emergence, continuous surveillance will be needed to understand the actual disease burden and provide guidance for shigellosis.
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