Prevalence of fluoroquinolone-resistant Escherichia coli O25:H4-ST131 (CTX-M-15-nonproducing) strains isolated in Japan

Chemotherapy
Shin-ichi YokotaNobuhiro Fujii

Abstract

Fluoroquinolone-resistant and extended-spectrum β-lactamase (ESBL)-carrying multidrug-resistant Escherichia coli have become severely problematic. In particular, a lineage of multilocus sequence-type ST131 which belongs to O25:H4 and carries ESBL CTX-M-15 has spread worldwide. Fluoroquinolone-resistant E. coli strains were isolated from various clinical specimens in a commercial clinical laboratory in 2008 and 2009 in Hokkaido Prefecture, Japan. Among 478 clinical isolates, 112 strains (23.4%) showed levofloxacin (LVX) resistance. About 80% of the fluoroquinolone-resistant strains (88 strains) showed common features, namely O25:H4-ST131, phylogenetic group B and the same mutation pattern in quinolone resistance-determining regions. Pulsed field gel electrophoresis patterns suggested numerous lineages of O25:H4-ST131. The fluoroquinolone-resistant strains, including strains of O25:H4-ST131 and other types, more frequently shared CTX-type ESBL genes than did fluoroquinolone-susceptible strains. The ESBL genes fell into the CTX-M-9 and CTX-M-2 groups. CTX-M-15 (CTX-M-1 group) was not found among any of the strains isolated in this study. Sitafloxacin showed markedly potent activity against E. coli isolates compared with LVX, cipro...Continue Reading

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Citations

Nov 6, 2012·Journal of Bacteriology·Sandip PaulEvgeni V Sokurenko
Apr 9, 2014·Journal of Infection and Chemotherapy : Official Journal of the Japan Society of Chemotherapy·Torahiko OkuboYutaka Tamura
Mar 8, 2013·Infection Control and Hospital Epidemiology : the Official Journal of the Society of Hospital Epidemiologists of America·Ritu BanerjeeJames R Johnson
May 24, 2016·Microbial Drug Resistance : MDR : Mechanisms, Epidemiology, and Disease·Enas Mamdouh Hefzy, Noha Anwar Hassuna
Feb 16, 2017·BioMed Research International·Yasuo OhkoshiShin-Ichi Yokota
Jul 2, 2014·Clinical Microbiology Reviews·Marie-Hélène Nicolas-ChanoineJean-Yves Madec
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Nov 22, 2016·Emerging Infectious Diseases·Toyotaka SatoShin-Ichi Yokota
Aug 1, 2019·Journal of Infection and Chemotherapy : Official Journal of the Japan Society of Chemotherapy·Masachika SaekiSatoshi Takahashi
Nov 19, 2021·Nihon saikingaku zasshi. Japanese journal of bacteriology·Toyotaka Sato

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