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Resistance to Fluoroquinolone by a Combination of Efflux and Target Site Mutations in Enteroaggregative Escherichia coli Isolated in Korea
Jun-Young Kim, Se-Mi Jeon, Hyungjun Kim, Nara Lim, Mi-Sun Park, Seong-Han Kim
Osong Public Health Res Perspect. 2012;3(4):239-244.   Published online December 31, 2012
Objectives

Enteroaggregative Escherichia coli (EAEC) was recently reported as a major diarrheagenic pathogen in infant and adult travelers, both in developing and developed countries. EAEC strains are known to be highly resistant to antibiotics including quinolones. Therefore in this study we have determined the various mechanisms of quinolone resistance in EAEC strains isolated in Korea.

Methods

For 26 EAEC strains highly resistant to...

Multiplex Real-Time Polymerase Chain Reaction-Based Method for the Rapid Detection of gyrA and parC Mutations in Quinolone-Resistant Escherichia coli and Shigella spp.
Junyoung Kim, Semi Jeon, Hyungjun Kim, Misun Park, Soobok Kim, Seonghan Kim
Osong Public Health Res Perspect. 2012;3(2):113-117.   Published online June 30, 2012

Two real-time polymerase chain reaction assays were developed to detect mutations in codons 83 and 87 in gyrA and in codons 80 and 91 in parC, the main sites that causes quinolone resistance in pathogenic Escherichia coli and Shigella spp. isolates. These assays can be employed as a useful method for controlling infections caused by quinolone-resistant E coli and Shigella...

A Contribution of MdfA to Resistance to Fluoroquinolones in Shigella flexneri
Jun-Young Kim, Se-Mi Jeon, Hyungjun Kim, Mi-Sun Park, Seong-Han Kim
Osong Public Health Res Perspect. 2011;2(3):216-217.   Published online December 31, 2011

In this study, we measured the drug resistance conferred by mdfA mutations in two Shigella flexneri strains. A mutant in mdfA genes was constructed by polymerase chain reaction–based, one-step inactivation of chromosomal genes. The antimicrobial susceptibility of parent and mutant strains to fluoroquinolones was determined by minimal inhibitory concentration (MICs). The △mdfA mutants were somewhat more susceptible to fluoroquinolones than...

Alterations of gyrA, gyrB, and parC and Activity of Efflux Pump in Fluoroquinolone-resistant Acinetobacter baumannii
Sunok Park, Kyeong Min Lee, Yong Sun Yoo, Jung Sik Yoo, Jae Il Yoo, Hwa Su Kim, Yeong Seon Lee, Gyung Tae Chung
Osong Public Health Res Perspect. 2011;2(3):164-170.   Published online December 31, 2011
Objectives

This study investigated the fluoroquinolone-resistant mechanism of 56 clinical cases of A baumannii infection from 23 non-tertiary hospitals, collected between 2004 and 2006.

Methods

Susceptibility testing was performed by broth microdilution and Epsilometer test. Analyses of quinolone resistance-determining region (QRDR) were done by sequencing. The activity of the efflux pump was measured using inhibitors.

Results

The sequences from selected 56 isolates were divided into...

Osong Public
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Print ISSN: 2210-9099
Online ISSN: 2233-6052

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