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Shift of CTX-M genotypes has determined the increased prevalence of extended-spectrum beta-lactamase-producing Escherichia coli in south-western Sweden

Journal article
Authors Lisa Helldal
Nahid Karami
Kirsten Floren
Christina Welinder-Olsson
Edward R.B. Moore
Christina Åhrén
Published in Clinical Microbiology and Infection
Volume 19
Issue 2
Pages E87-E90
ISSN 1198-743X
Publication year 2013
Published at Institute of Biomedicine, Department of Infectious Medicine
Pages E87-E90
Language en
Keywords CTX-M; E. coli ; epidemiology; ESBL ; O25b-ST131
Subject categories Microbiology


The prevalence of Escherichia coli producing extended-spectrum β-lactamases (ESBLs) markedly increased during 2004-2008 in south-western Sweden, with a greater increase in urinary isolates in hospitals (0.2-2.5%) than in the community (0.2-1.6%). ESBLs of genotype CTX-M predominated, with a significant (p <0.02) shift from the CTX-M-9 to CTX-M-1 phylogroup occurring among urinary ESBL-producing E. coli isolated early (n = 41) as compared with late (n = 221) in the study period. The increase in ESBL-producing E. coli was polyclonal, and only partly attributable to an increase (0-24%) in the number of O25b-ST131 isolates carrying CTX-M-15. The increase was prominent in men and in elderly patients, and warrants continued surveillance.

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