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Survival in the env...
Survival in the environment is a possible key factor for the expansion of Escherichia coli strains producing extended-spectrum beta-lactamases
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- Starlander, Gustaf (författare)
- Uppsala universitet,Klinisk bakteriologi
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- Yin, Hong (författare)
- Uppsala universitet,Klinisk bakteriologi
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- Edquist, Petra (författare)
- Uppsala universitet,Klinisk bakteriologi
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- Melhus, Åsa (författare)
- Uppsala universitet,Klinisk bakteriologi
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(creator_code:org_t)
- 2013-06-12
- 2014
- Engelska.
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Ingår i: Acta Pathologica, Microbiologica et Immunologica Scandinavica (APMIS). - : Wiley. - 0903-4641 .- 1600-0463. ; 122:1, s. 59-67
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Acquired resistance to cephalosporins in Enterobacteriaceae is a global problem. After an outbreak at Uppsala University Hospital of extended-spectrum -lactamase (ESBL)-positive Klebsiella pneumoniae producing CTX-M-15, there was a shift from AmpC to ESBL production among Escherichia coli isolates. To explore the basis for this epidemiological shift, 46 E. coli isolates (ESBLs, n=23; AmpC, n=23) were characterized with regard to genetic relatedness, -lactamase, replicon and integron types, antibiotic resistance profiles, and genes encoding virulence factors. In addition, the survival in the environment and on hospital-associated materials was analysed. CTX-M-15 was the most frequent ESBL (78%). Only three (13%) of the AmpC enzymes were harboured on plasmids (CMY-2, DHA-1). Independent of plasmid-mediated beta-lactamase, IncF plasmids predominated and only class I integrons were detected. The ESBL producers carried more virulence genes (p=0.04), exhibited a broader resistance phenotype (p=0.01) and survived significantly longer (p=0.03) on different materials than the AmpC-producing isolates. In conclusion, ESBL-producing isolates had properties which are likely to augment their competitiveness. Apart from antibiotic resistance and virulence factors, extended survival in the environment could be a selective trait for successful ESBL-producing E. coli strains.
Nyckelord
- E-coli
- AmpC
- ESBL
- environment
- virulence genes
- plasmids
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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