1887

Abstract

Antimicrobial resistance associated with animal hosts is easily transmitted to humans either by direct contact with resistant organisms or by transferring resistance genes into human pathogens.

There are limited studies on antimicrobial resistance genes and genetic elements of multidrug-resistant (MDR) in veterinary hospitals in Taiwan.

The aim of this study was to investigate antimicrobial resistance genes in multidrug-resistant from animals.

Between January 2014 and August 2015, 95 multidrug-resistant isolates were obtained from pigs (=66), avians (=18), and other animals (=11) in a veterinary hospital in Taiwan. Susceptibility testing to 24 antimicrobial agents of 14 antimicrobial classes was performed. Antimicrobial resistance genes, integrons, and insertion sequences were analysed by polymerase chain reaction and nucleotide sequencing. Pulsed-field gel electrophoresis (PFGE), and multi-locus sequence typing were used to explore the clonal relatedness of the study isolates.

Different antimicrobial resistance genes found in these isolates were associated with resistance to β-lactams, tetracycline, phenicols, sulfonamides, and aminoglycosides. Fifty-five of 95 isolates (55/95, 57.9 %) were not susceptible to extended-spectrum cephalosporins, and (11/55, 20.0 %) and (40/55, 72.7 %) were the most common extended-spectrum β-lactamase (ESBL) and AmpC genes, respectively. Both and were present on conjugative plasmids that contained the insertion sequence IS upstream of the genes. Plasmid-mediated FOX-3 β-lactamase-producing was first identified in Taiwan. Forty isolates (40/95, 42 %) with class 1 integrons showed seven resistance phenotypes. Genotyping of 95 isolates revealed 91 different I pulsotypes and 52 different sequence types. PFGE analysis revealed no clonal outbreaks in our study isolates.

This study showed a high diversity of antimicrobial resistance genes and genotypes among MDR isolated from diseased livestock in Taiwan. To our knowledge, this is the first report of plasmid-mediated ESBL in FOX-3 β-lactamase-producing isolates in Taiwan. MDR isolates from animal origins may contaminate the environment, resulting in public health concerns, indicating that MDR isolates from animals need to be continuously investigated.

Funding
This study was supported by the:
  • Tungs' Taichung MetroHarbor Hospital (Award TTMHH-106R0004)
    • Principle Award Recipient: Chih-MingChen
  • Clinical Trial Center, China Medical University Hospital (Award DMR-108-140)
    • Principle Award Recipient: Lii-TzuWu
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2021-11-15
2021-12-04
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