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- W2137271359 abstract "Recently, serotype O75 was found to be prominent among the non-ST131 ciprofloxacin-resistant Escherichia coli, and they were all lactose non-fermenters. In this study, we investigated the prevalence and characteristics of lactose non-fermenters in urinary isolates of E. coli. A total of 167 E. coli isolates was collected. Antimicrobial susceptibility tests were determined by VITEK 2 (bioMerieux, France). The lactose non-fermenters underwent PCR-based O typing, multilocus sequence typing (MLST) analysis, phylogenetic grouping. For ciprofloxacin-resistant isolates, the resistance mechanisms were investigated. Thirty-three (19.7%) isolates were lactose non-fermenters and the ciprofloxacin resistance rate was significantly higher than in lactose fermenters (66.7% vs. 31.6%, P = 0.0002). According to the serotype, O75 was the most common (42.4%, 14/33) and was followed by O16 (5/33), O2 (4/33), O25b (3/33), O15 (1/33), O6 (1/33), O1 (1/33). All the O75 isolates were ciprofloxacin-resistant and belonged to ST1193. By MLST, they were resolved into 11 STs. ST1193 was the most common (14/33) and was followed by ST131 (8/33). Interestingly, 8 isolates of ST131 were divided into three O types [O16 (4 isolates), O25b (3), and non-typeable (1)]. The ciprofloxacin resistance rate was high in isolates of O75-ST1193 and O25b-ST131 but low in O16-ST131 and O2-ST95. All the ciprofloxacin-resistant isolates showed identical triple mutations in gyrA and parC but the serotype O25b isolates had an additional mutation in parC (E84V). Only one isolate harbored aac(6')-Ib-cr variant and no qnr gene was detected. Continuous monitoring of the prevalence and clonal composition of the lactose non-fermenters is needed." @default.
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- W2137271359 date "2014-11-01" @default.
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- W2137271359 title "Prevalence and characteristics of lactose non-fermenting Escherichia coli in urinary isolates" @default.
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- W2137271359 doi "https://doi.org/10.1016/j.jiac.2014.07.005" @default.
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