Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/25468
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Detection of the florfenicol resistance gene floR in Chryseobacterium isolates from rainbow trout. Exception to the general rule?
Authors: Verner-Jeffreys, David W
Brazier, Thomas
Perez, Ramon Y
Ryder, David
Card, Roderick M
Welch, Timothy J
Hoare, Rowena
Ngo, Thao P H
McLaren, Nikki
Ellis, Richard
Bartie, Kerry
Feist, Stephen W
Rowe, William M P
Adams, Alexandra
Thompson, Kim D
Contact Email: rowena.hoare1@stir.ac.uk
Keywords: Flavobacteriaceae
Chryseobacterium
fish pathogen
antimicrobial resistance
virulence
horizontal gene transfer
Issue Date: Apr-2017
Citation: Verner-Jeffreys DW, Brazier T, Perez RY, Ryder D, Card RM, Welch TJ, Hoare R, Ngo TPH, McLaren N, Ellis R, Bartie K, Feist SW, Rowe WMP, Adams A & Thompson KD (2017) Detection of the florfenicol resistance gene floR in Chryseobacterium isolates from rainbow trout. Exception to the general rule?, FEMS Microbiology Ecology, 93 (4), Art. No.: fix015.
Abstract: Bacteria from the family Flavobacteriaceae often show low susceptibility to antibiotics. With the exception of two Chryseobacterium spp. isolates that were positive for the florfenicol resistance gene floR, no clinical resistance genes were identified by microarray in 36 Flavobacteriaceae isolates from salmonid fish that could grow in ≥ 4 mg/L florfenicol. Whole genome sequence analysis of the floR positive isolates revealed the presence of a region that contained the antimicrobial resistance genes floR, a tet(X) tetracycline resistance gene, a streptothricin resistance gene and a chloramphenicol acetyltransferase gene. In silico analysis of 377 published genomes for Flavobacteriaceae isolates from a range of sources confirmed that well-characterised resistance gene cassettes were not widely distributed in bacteria from this group. Efflux pump-mediated decreased susceptibility to a range of antimicrobials was confirmed in both floR positive isolates using an efflux pump inhibitor (phenylalanine-arginine β-naphthylamide) assay. The floR isolates possessed putative virulence factors, including production of siderophores and haemolysins, and were mildly pathogenic in rainbow trout. Results support the suggestion that, despite the detection of floR, susceptibility to antimicrobials in Flavobacteriaceae is mostly mediated via intrinsic mechanisms rather than the horizontally acquired resistance genes more normally associated with Gram-negative bacterial pathogens such as Enterobacteriaceae.
DOI Link: http://dx.doi.org/10.1093/femsec/fix015
Rights: Use in this Repository permitted under the Open Government Licence: http://www.nationalarchives.gov.uk/doc/open-government-licence/open-government-licence.htm

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