Community carriage of ESBL-producing Escherichia coli is associated with strains of low pathogenicity: a Swedish nationwide study.
J Antimicrob Chemother
; 72(2): 582-588, 2017 02.
Article
in En
| MEDLINE
| ID: mdl-27798205
ABSTRACT
OBJECTIVES:
Community carriage of ESBL-producing Escherichia coli (EPE) is common worldwide and there is a need to understand the connection between carriage and infection. We compared the molecular characteristics of EPE among Swedish community carriers with those of EPE causing invasive infections.METHODS:
We collected 2134 faecal samples from randomly selected Swedish inhabitants and examined them for the presence of EPE. All participating volunteers answered a questionnaire about putative risk factors for EPE carriage. Suspected EPE isolates (nâ=â418) from patients with bloodstream infection (BSI) were collected from Swedish laboratories. Isolates were genotypically and phenotypically characterized.RESULTS:
Our results show that the EPE population found in carriers generally had lower pathogenicity compared with the isolates from BSIs, since carriers had a lower proportion of E. coli belonging to phylogroup B2, ST131 and ST131 subclone H30-Rx. Isolates from carriers also had lower levels of multiresistance. The Swedish carriage rate of EPE was 4.7% (101/2134) among healthy volunteers. Risk factors associated with carriage were travel to countries in Asia (ORâ=â3.6, 95% CIâ=â1.4-9.2) and Africa (ORâ=â3.6, 95% CIâ=â1.7-7.7) and a diet without pork (ORâ=â0.5, 95% CIâ=â0.3-0.8 for pork eaters).CONCLUSIONS:
E. coli host factors previously associated with higher pathogenicity were all more common in BSIs compared with carriers. This indicates that the risk of invasive infection with EPE may be relatively modest in many community carriers and that EPE carriage of high-risk strains should be the focus of attention for prevention.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Beta-Lactamases
/
Carrier State
/
Bacteremia
/
Drug Resistance, Multiple, Bacterial
/
Escherichia coli
/
Escherichia coli Infections
Type of study:
Diagnostic_studies
/
Observational_studies
/
Prevalence_studies
/
Risk_factors_studies
Limits:
Adolescent
/
Adult
/
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Country/Region as subject:
Europa
Language:
En
Journal:
J Antimicrob Chemother
Year:
2017
Document type:
Article
Affiliation country: