JCM 5046 PDF

JCM 5046 PDF

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To date, inactivation of mgrB has been the main mechanism of polymyxin resistance observed in K. Address correspondence to Willames M. In addition, bla BKC-1 was harbored by a small unstable plasmid that could be easily lost in the absence of selective pressure.

Multilocus sequence typing of Klebsiella pneumoniae nosocomial isolates. Antimicrobial susceptibility profiles of BKCproducing K. In this study, a low frequency of isolates carrying bla BKC-1 was observed and was mainly attributed to the persistence jc, a K.

Only 2 BKCproducing K. The principal objective of this study was to evaluate the frequency of bla BKC-1 by testing a collection of Klebsiella isolates.

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Comparison of phenotypic tests for detecting BKCproducing Enterobacteriaceae isolates. BKC-1 is a new class A serine carbapenemase that was recently identified in Klebsiella pneumoniae clinical isolates. These carbapenem resistance genes are frequently harbored on mobile genetic elements that are highly transmissible, contributing to the increasing frequency of carbapenem-resistant Enterobacteriaceae 1.

Performance standards for antimicrobial susceptibility testing; 25th informational supplement. Since BKC-1 is a weak carbapenemase and other mechanisms could be associated with carbapenemase production, we selected Klebsiella strains independent of the resistance phenotype.

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Please review our privacy policy. The bla BKC-1 gene was inserted into a kb plasmid that was identical to the previously reported plasmid, p In the past decade, carbapenemase-encoding genes such as bla KPC-likebla OXAand bla NDM-like have emerged as the main mechanisms of carbapenem resistance in Enterobacteriaceae. National Center for Biotechnology InformationU. S, sensitive; R, resistant. The two BKCproducing isolates belonged to clonal complex and possessed identical pulsed-field gel electrophoresis patterns.

However, Southern blot analysis revealed that the bla BKC-1 jcmm was located on the same kb plasmid in both 5064. To evaluate the stability of p harbored by the Kpn isolate, we performed serial passages of the Kpn isolate on Mueller-Hinton agar plates without the addition of antibiotic. More studies with greater numbers of isolates from all Brazilian states are necessary to assess the real prevalence of isolates carrying bla BKC J Antimicrob Chemother To determine whether this plasmid was identical to p, the first plasmid identified as carrying bla BKC-1we performed jmc sequencing of the plasmid recovered from KpnJ.

Open in a separate window. Only 2 of Klebsiella isolates 0. Carbapenemase-producing Klebsiella pneumoniae, a key pathogen set for global nosocomial dominance.

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Initially, we performed transformation by electroporation into Escherichia coli Top We verified that, in the absence of selective pressure, the plasmid harboring the bla BKC-1 gene, p, was unstable.

These data might suggest that, although genetically related, the isolates were probably subjected to distinct selective pressures, which could have resulted in different OMP modifications.

Transformant cells were selected on LB agar plates supplemented with 0.

The other authors have no conflicts 5064 declare. BKC-1 Brazilian Klebsiella carbapenemase is a class A serine carbapenemase that was recently identified in Klebsiella pneumoniae isolates from Brazil that belonged to sequence type ST clonal complex [CC] 2.

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Abstract BKC-1 is a new class A serine carbapenemase that was recently identified in Klebsiella pneumoniae clinical isolates.

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Nicolettia Silvia R. This article has been cited by other articles in PMC. Clinical and Laboratory Standards Institute. Sampaiob, c and Ana C. The Kpn and KpnJ strains showed different plasmid profiles. Among the Klebsiella strains, Antimicrob Agents Chemother Published online Jul J Clin Microbiol Methods for dilution antimicrobial susceptibility tests for bacteria that grow aerobically; approved standard— 10th ed CLSI document MA Support Center Support Center.

The Klebsiella strains were isolated from different clinical specimens obtained between and Fig. In conclusion, prudent 5406 of antimicrobials and strict adherence to infection control measures seem to be the only effective tools for preventing the acquisition and spread of new carbapenemase-encoding genes.

Antimicrobial susceptibility testing was performed by the broth microdilution method, according to CLSI guidelines 45. It is important to note that such new studies must search for bla BKC-1 using molecular techniques, since phenotypic tests may not accurately detect BKCproducing isolates 8. Prepublished online May Journal List Antimicrob Agents Chemother v. The mgrB gene as a key target for acquired resistance to colistin in Klebsiella pneumoniae. A Map of Brazil, showing the geographic distribution of Klebsiella isolates that were investigated for the bla BKC-1 gene.