1. Antimicrobial resistance profiles of vancomycin-resistant Enterococcus species isolated from laboratory mice
- Author
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Kazutaka Ohsawa, Ryuki Kadomatsu, Hitoki Yamanaka, Noriaki Kubo, Toshikazu Takagi, Takahira Takemoto, Naoto Yamamoto, and Makiko Ohsawa
- Subjects
040301 veterinary sciences ,Topoisomerase IV ,Antibiotic resistance ,Microbial Sensitivity Tests ,medicine.disease_cause ,DNA gyrase ,Microbiology ,0403 veterinary science ,Mice ,03 medical and health sciences ,Minimum inhibitory concentration ,Enterococcus gallinarum ,Animals, Laboratory ,Drug Resistance, Bacterial ,medicine ,Enterococcus casseliflavus ,Animals ,Vancomycin-resistant Enterococcus ,030304 developmental biology ,0303 health sciences ,laboratory mice ,General Veterinary ,biology ,Vancomycin Resistance ,Sequence Analysis, DNA ,04 agricultural and veterinary sciences ,biochemical phenomena, metabolism, and nutrition ,biology.organism_classification ,Anti-Bacterial Agents ,Enterococcus ,Genes, Bacterial ,biology.protein ,Original Article - Abstract
Isolates of 24 enterococci, 5 Enterococcus casseliflavus and 19 Enterococcus gallinarum, possessing vanC genes and showing low-level resistance to vancomycin were obtained from mice from commercial mouse breeding companies. Since some of these isolates showed resistance to other antibiotics, the purpose of this study was to clarify the resistant profiles of these isolates. One E. casseliflavus isolate showed resistance to erythromycin with a minimal inhibitory concentration (MIC) of 8 μg/mL and also showed apparent resistance to fluoroquinolones with an MIC of 32 μg/mL for ciprofloxacin. The MICs of 2 other fluoroquinolone-resistant E. casseliflavus and E. gallinarum isolates were 3 and 6 μg/mL, respectively. These 3 resistant isolates showed an absence of macrolide- and fluoroquinolone-resistant genes, including amino acid substitutions in the quinolone resistance determining regions of DNA gyrase and topoisomerase IV. Resistance to tetracycline was detected in 2 E.gallinarum isolates that were highly resistant, exhibiting MICs of 48 and 64 μg/mL and possessing tet(O) genes.The results indicate that antibiotic-resistant enterococci are being maintained in some laboratory mouse strains that have never been treated with an antibiotic., Journal of veterinary science, 20(2), e13; 2019
- Published
- 2019