We studied a collection of 105 clinical enterobacteria with unusual phenotypes of quinolone susceptibility to analyze the occurrence of plasmid-mediated quinolone resistance (PMQR) and oqx genes and their implications for quinolone susceptibility. The oqxA and oqxB genes were found in 31/34 (91%) Klebsiella pneumoniae and 1/3 Klebsiella oxytoca isolates. However, the oqxA- and oqxB-harboring is...

This work describes the characterization of plasmid-mediated quinolone-resistance (PMQR) genes from a multicenter study of ESBL-producing Enterobacteriaceae pediatric clinical isolates in Mexico. The PMQR gene-positive isolates were characterized with respect to ESBLs, and mutations in the GyrA and ParC proteins were determined. The phylogenetic relationship was established by PFGE and the tran...

30 We studied a collection of 105 clinical enterobacteria with unusual phenotypes of 31 quinolone susceptibility to analyze the occurrence of plasmid mediated quinolone resistance 32 (PMQR) and oqx genes and their implications on quinolone susceptibility. The oqxA and 33 oqxB genes were found in 31/34 (91%) Klebsiella pneumoniae and 1/3 Klebsiella oxytoca. 34 However, the oqxA/oqxB-harboring is...

This experiment was carried out to investigate the effects of different levels chromium picolinate (CrPic) and chromium nanoparticles (nano-Cr) on the performance and immune function of broilers under heat stress condition. A total of 320 Ross 308 broiler chicks (from 21 to 42 days) were assigned randomly into eight treatment groups (four replicates per treatment, and 10 chicks per replicate) a...

OBJECTIVES To investigate the presence of antibiotic resistance genes (ARGs), related to commonly used β-lactams and quinolones, in Escherichia coli present in hospital wastewater in central India. METHODS Cefotaxime- and ciprofloxacin-resistant E. coli isolates from hospital-associated wastewater samples were collected from two tertiary care hospitals in the Ujjain district of India during 2...

Ninety-three Malaysian extended-spectrum β-lactamase (ESBL)-producing Klebsiella pneumoniae isolates were investigated for ciprofloxacin resistance. Two mismatch amplification mutation (MAMA) assays were developed and used to facilitate rapid detection of gyrA and parC mutations. The isolates were also screened for plasmid-mediated quinolone resistance (PMQR) genes including aac(6')-Ib-cr, qepA...

Recently, several plasmid-mediated quinolone resistance (PMQR) genes conferring low levels of quinolone resistance have been discovered. To evaluate the temporal change in the prevalence of PMQR genes over a decade in a tertiary hospital in the Republic of Korea, we selected every fifth isolate of Escherichia coli and Klebsiella pneumoniae and every third isolate of Enterobacter cloacae between...

OBJECTIVES Finafloxacin is an investigational fluoroquinolone exhibiting broad-spectrum activity that is enhanced under slightly acidic conditions (pH 5.0-6.5). The impact of individual and combinations of chromosomal mutations (gyrA, parC and marR) and the plasmid-mediated fluoroquinolone resistance mechanisms QepA1, QnrA1, QnrB1, QnrS1 and AAC(6')-Ib-cr were investigated. METHODS The MICs o...

Preparation and Evaluation of Master seed prepared from Local variant infectious bronchitis virus (IBV) isolated from different poultry farms in Egypt and identified as IS/1494/06 nephropathogenic strain are very important point for vaccine production for controlling of infectious brobchitis(IB) disease in Egypt. Master seed of the virus (MSV) contained 10 EID50 per dose per bird free from bact...

Sir, Quinolone resistance in Enterobacteriaceae usually results from mutations in genes coding for chromosomally encoded type II topoisomerases, efflux pumps or porin-related proteins. Recently, transferable, plasmid-borne, quinolone resistance genes—qnrA, qnrB, qnrS, cr variant of aac(60)-Ib, qepA and oxqB—have been observed in clinical isolates, more frequently among strains producing plasmid...