September 22, 2019  |  

Identification and characterization of conjugative plasmids that encode ciprofloxacin resistance in Salmonella.

Authors: Chen, Kaichao and Dong, Ning and Zhao, Shaohua and Liu, Lizhang and Li, Ruichao and Xie, Miaomiao and Lin, Dachuan and Chan, Edward Wai-Chi and Meng, Jianghong and McDermott, Patrick F and Chen, Sheng

This study aimed to characterize novel conjugative plasmids that encode transferrable ciprofloxacin resistance in Salmonella In this study, 157 non-duplicated Salmonella isolates were recovered from food products, 55 out of which were found to be resistant to ciprofloxacin. Interestingly, 37 out of the 55 (67%) CipRSalmonella isolates did not harbor any mutations in the Quinolone resistance determine regions (QRDR). Interestingly, six Salmonella isolates were shown to carry two novel types of conjugative plasmids that could transfer ciprofloxacin resistance phenotype to E. coli J53 (AziR). The first type belonged to the ~110kb IncFIB type conjugative plasmid carrying qnrB-bearing and aac(6')-Ib-cr-bearing mobile elements. Transfer of the plasmid between E. coli or Salmonella could confer CIP MIC to 1 to 2µg/ml. The second type of conjugative plasmid belonged to ~240kb IncH1/IncF plasmids carrying a single PMQR gene, qnrS Importantly, this type of conjugative ciprofloxacin resistance plasmids could be detected in clinical isolates of Salmonella Dissemination of these conjugative plasmids that confer ciprofloxaicn resistance poses serious public health impact and Salmonella infection control. Copyright © 2018 American Society for Microbiology.

Journal: Antimicrobial agents and chemotherapy
DOI: 10.1128/AAC.00575-18
Year: 2018

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