- Poster presentation
- Open Access
Trends in extended spectrum beta-lactamase (ESBL) producing Enterobacteriaceae and ESBL genes in a Dutch teaching hospital, measured in 5 yearly point prevalence surveys (2010-2014)
© Willemsen et al; licensee BioMed Central Ltd. 2015
Published: 16 June 2015
For the execution of a good infection control policy we depend on information about the local endemic level of resistant microorganisms and resistance genes.
This paper describes the trends in prevalence of ESBL producing Enterobacteriaceae (ESBL-E) and ESBL genes, measured in five consecutive yearly Point Prevalence Surveys (PPS), in a Dutch teaching hospital.
On the day of the survey all patient present in the hospital and day-care clinic (including patients on dialyses), were screened for rectal ESBL-E carriage. Rectal swabs (Eswab, Copan, Italy) were taken and cultured using an enrichment broth, containing cefotaxime (0.25 mg/L) and vancomycin (8 mg/L) (TSB-VC) and a selective agar plate (EbSA, Alpha-Omega, Netherlands). Both phenotypical and genotypical methods were used to detect the production of ESBL and presence of ESBL-genes. Isolates containing an identical ESBL gene, from patients that were admitted on the same ward, were selected for Amplified Fragment Length Polymorphism typing to identify clonal relatedness.
Out of 2,695 patients who were screened and evaluable, 135 (5.0%) were positive for ESBL-E. E. coli was most frequently found (112/145), followed by K. pneumoniae (9/145), and E.cloacae (7/145). The ESBL-E prevalence was stable over the years. In all PPSs CTX-M ESBLs were the most prevalent ESBL type. Over the years, a decrease in CTX-M-1-1 like ESBL genes was observed, starting with a proportion of 44% in 2010, 34% in 2011, 22% in 2012, 24% in 2013 to 25% in 2014 (p=0.026). Overall 5.2% of all ESBL-E were acquired by nosocomial transmission based on epidemiological linkage and molecular typing of the strains.
During this 5-year period the prevalence of rectal ESBL-E carriage was stable and only a minority was caused by nosocomial transmission. A relative decrease of CTX-M-1-1 like ESBL genes was observed. As this is the most prevalent ESBL gene in poultry, this decrease might be related to the strong (>60%) decrease in the use of antibiotics in poultry in our country in the same period.
Disclosure of interest
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.