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Volume 20, Number 5—May 2014


Extended-Spectrum β-Lactamases in Escherichia coli and Klebsiella pneumoniae in Gulls, Alaska, USA

Jonas Bonnedahl, Jorge Hernandez, Johan Stedt, Jonas Waldenström, Björn Olsen, and Mirva DrobniComments to Author 
Author affiliations: Linnaeus University, Kalmar, Sweden (J. Bonnedahl, J. Hernandez, J. Stedt, J. Waldenström); Kalmar County Hospital, Kalmar (J Bonnedahl, J. Hernandez); Uppsala University, Uppsala, Sweden (J. Hernandez, B. Olsen, M. Drobni)

Main Article


Characterization of Escherichia coli and Klebsiella pneumoniae ESBL-producing isolates, Barrow, Alaska, USA*

Isolates, no.† bla genotype
MLST profile
E. coli
12 14 1 ST38 (ST2253)‡
11 14 ST131 (ST10)§
5 19 ST2967¶
3 27 ST405
1 15 ST131
1 1 ST2967¶
K. pneumoniae
4 15 12 1 ND
5 12 1 ND
2 12 ND
2 102 19 ND
8 102 ND
1 19 ND
4 15 1 1 ND
1 2 ND

*ESBL, extended-spectrum β-lactamase; MLST, multilocus sequence type; ST, sequence type; ND, no data.
E. coli comprised 33 isolates from 32 samples. K. pneumoniae comprised 35 isolates from 35 samples. and 12 samples were both E. coli and K. pneumoniae ESBL-harboring isolates but did not display horizontal transfer resulting from deviating resistance genotypes.
‡One of the isolates harbored a novel MLST allele, giving the novel ST2253 (deposited in the E. coli MLST database at the ERI, University College, Cork, Ireland, UK (
§One of the isolates had ST10; the remaining 10 had ST131.
¶Isolates harbored a novel MLST allele, rendering the novel ST2967 (deposited in the MLST database). The single isolate with only blaTEM-1 may contain undetected ESBL genes because of the non-ESBL phenotype of TEM-1.

Main Article