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Clinical and Laboratory Standards Institute.
ucm The other authors have no conflicts to declare. J Clin Microbiol A Map of Brazil, showing the geographic distribution of Klebsiella isolates that were investigated for the bla BKC-1 gene. Performance standards for antimicrobial susceptibility testing; 25th informational supplement. Open in a separate window.
Comparison of phenotypic tests for detecting BKCproducing Enterobacteriaceae isolates. 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.
Santosb Jorge L.
Antimicrobial susceptibility testing was performed by the broth microdilution method, according to CLSI guidelines 45. The carbapenemase was encoded by bla BKC-1which was located on a small nonconjugative plasmid 2. 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.
BKC-1 is a new class A serine carbapenemase that was recently identified in Klebsiella pneumoniae clinical isolates.
However, Southern blot analysis revealed that the bla BKC-1 gene was located on the same kb plasmid in both isolates. Only 2 BKCproducing K. Martinsa Adriana G. Author information Article notes Copyright and License information Disclaimer. In addition, bla BKC-1 was harbored by a small unstable plasmid that could be easily lost in the absence of selective pressure.
Among the Klebsiella strains, We verified that, in the absence of selective pressure, the plasmid harboring the bla BKC-1 gene, p, was unstable. Support Center Support Center.
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.
Prepublished online May Antimicrobial susceptibility profiles of BKCproducing K.
A total of Klebsiella strains collected from previous surveillance studies were randomly selected for this study, in order to represent distinct Brazilian geographic regions. Plasmid extraction of K. More studies with greater numbers of isolates from all Brazilian states are necessary to assess the real prevalence of isolates carrying bla BKC Methods for dilution antimicrobial susceptibility tests for bacteria that grow 5064 approved standard— 10th ed CLSI document MA To determine whether this plasmid was identical to p, the first plasmid identified as carrying bla BKC-1we performed whole-plasmid sequencing of the plasmid recovered from KpnJ.
The principal objective of this study was to evaluate the frequency of bla BKC-1 by testing a collection of Klebsiella isolates. Sampaiob, c and Ana C. The Klebsiella strains were isolated from different clinical specimens obtained between and Fig. Address correspondence to Willames M.
Antimicrob Agents Chemother Frequency of BKCproducing Klebsiella species isolates. 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. 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.
Abstract BKC-1 is a new class A serine carbapenemase that was recently identified in Klebsiella pneumoniae clinical isolates.