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Martinsa Adriana G. 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.

Multilocus sequence typing of Klebsiella pneumoniae nosocomial isolates.

Author information Article notes Copyright and License information Disclaimer. The two BKCproducing isolates belonged to clonal complex and possessed identical pulsed-field gel electrophoresis patterns.

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. During the experiments, it was observed that bla BKC-1 was easily lost in the absence of selective pressure. Comparison of phenotypic tests for detecting BKCproducing Enterobacteriaceae isolates. Methods for dilution antimicrobial susceptibility tests for bacteria that grow aerobically; approved standard— 10th ed CLSI document MA S, sensitive; R, resistant.

Initially, we performed transformation by electroporation into Escherichia coli Top Performance standards for antimicrobial susceptibility testing; 25th informational supplement.


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

Transformant cells were selected on LB agar plates supplemented with 0. In addition, bla BKC-1 was harbored by a small unstable plasmid that could be easily lost in the absence of selective pressure. The other authors have no conflicts to declare. Only 2 of Klebsiella isolates 0. Santosb Jorge L.

J Antimicrob Chemother Frequency of BKCproducing Klebsiella species isolates. However, Southern blot analysis revealed that the bla BKC-1 gene was jcmm on the same kb plasmid in both isolates. The mgrB gene as a key target for acquired resistance to colistin in Klebsiella pneumoniae. Antimicrob Agents Chemother Antimicrobial susceptibility testing was performed by the broth microdilution method, according to CLSI guidelines 45.

To evaluate the stability of p harbored by the Kpn isolate, we performed serial passages of the Kpn isolate on Jccm agar plates without the addition of antibiotic.

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This article has been cited by other articles in PMC. A total of Klebsiella strains collected from previous surveillance studies were randomly selected for this study, in order to represent distinct Brazilian geographic regions.

In this study, a low frequency of isolates carrying bla BKC-1 was observed and was mainly attributed to the persistence of a K. Address correspondence to Willames M. These data might suggest that, although genetically related, the isolates were probably subjected to distinct selective jmc, which could have resulted in different OMP modifications.


J Clin Microbiol We verified that, in the absence of selective pressure, the plasmid harboring the bla BKC-1 gene, p, was unstable. The Klebsiella strains were isolated from different clinical specimens obtained between and Fig.

Antimicrobial susceptibility profiles of BKCproducing K. More studies with greater numbers of isolates from all Brazilian states are necessary to assess the real prevalence of isolates carrying bla BKC To determine whether this plasmid was identical to p, the 50046 plasmid identified as carrying bla BKC-1jck performed whole-plasmid sequencing of the plasmid recovered from KpnJ.

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. Clinical and Laboratory Standards Institute. Open in a separate window. Only 2 BKCproducing K.

JCM5045N, JCM5046, JCM5046N

The bla BKC-1 gene was inserted into a kb plasmid that was identical to the previously reported plasmid, p In conclusion, prudent use 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. Kpn showed susceptibility to tigecycline MIC, 0.

Prepublished online May