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2012-05-30Zeitschriftenartikel DOI: 10.1186/2047-2994-1-21
Vancomycin-resistant vanB-type Enterococcus faecium isolates expressing varying levels of vancomycin resistance and being highly prevalent among neonatal patients in a single ICU
dc.contributor.authorWerner, Guido
dc.contributor.authorKlare, Ingo
dc.contributor.authorFleige, Carola
dc.contributor.authorGeringer, Uta
dc.contributor.authorWitte, Wolfgang
dc.contributor.authorJust, Heinz-Michael
dc.contributor.authorZiegler, Renate
dc.date.accessioned2018-05-07T16:12:48Z
dc.date.available2018-05-07T16:12:48Z
dc.date.created2013-01-09
dc.date.issued2012-05-30none
dc.identifier.otherhttp://edoc.rki.de/oa/articles/reslazZctnl4/PDF/21bWsFMo9mDBo.pdf
dc.identifier.urihttp://edoc.rki.de/176904/1400
dc.description.abstractBackground: Vancomycin-resistant isolates of E. faecalis and E. faecium are of special concern and patients at risk of acquiring a VRE colonization/infection include also intensively-cared neonates. We describe here an ongoing high prevalence of VanB type E. faecium in a neonatal ICU hardly to identify by routine diagnostics. Methods: During a 10 months’ key period 71 E. faecium isolates including 67 vanB-type isolates from 61 patients were collected non-selectively. Vancomycin resistance was determined by different MIC methods (broth microdilution, Vitek® 2) including two Etest® protocols (McFarland 0.5/2.0. on Mueller-Hinton/Brain Heart Infusion agars). Performance of three chromogenic VRE agars to identify the vanB type outbreak VRE was evaluated (BrillianceTM VRE agar, chromIDTM VRE agar, CHROMagarTM VRE). Isolates were genotyped by SmaI- and CeuI-macrorestriction analysis in PFGE, plasmid profiling, vanB Southern hybridisations as well as MLST typing. Results: Majority of vanB isolates (n = 56, 79%) belonged to a single ST192 outbreak strain type showing an identical PFGE pattern and analyzed representative isolates revealed a chromosomal localization of a vanB2-Tn5382 cluster type. Vancomycin MICs in cation-adjusted MH broth revealed a susceptible value of ≤4 mg/L for 31 (55%) of the 56 outbreak VRE isolates. Etest® vancomycin on MH and BHI agars revealed only two vanB VRE isolates with a susceptible result; in general Etest® MIC results were about 1 to 2 doubling dilutions higher than MICs assessed in broth and values after the 48 h readout were 0.5 to 1 doubling dilutions higher for vanB VRE. Of all vanB type VRE only three, three and two isolates did not grow on BrillianceTM VRE agar, chromIDTM VRE agar and CHROMagarTM VRE, respectively. Permanent cross contamination via the patients’ surrounding appeared as a possible risk factor for permanent VRE colonization/infection. Conclusions: Low level expression of vanB resistance may complicate a proper routine diagnostics of vanB VRE and mask an ongoing high VRE prevalence. A high inoculum and growth on rich solid media showed the highest sensitivity in identifying vanB type resistance.eng
dc.language.isoeng
dc.publisherRobert Koch-Institut, Infektionskrankheiten / Erreger
dc.subject.ddc610 Medizin
dc.titleVancomycin-resistant vanB-type Enterococcus faecium isolates expressing varying levels of vancomycin resistance and being highly prevalent among neonatal patients in a single ICU
dc.typeperiodicalPart
dc.identifier.urnurn:nbn:de:0257-10029155
dc.identifier.doi10.1186/2047-2994-1-21
dc.identifier.doihttp://dx.doi.org/10.25646/1325
local.edoc.container-titleAntimicrobial Resistance and Infection Control
local.edoc.fp-subtypeArtikel
local.edoc.type-nameZeitschriftenartikel
local.edoc.container-typeperiodical
local.edoc.container-type-nameZeitschrift
local.edoc.container-urlhttp://www.aricjournal.com/content/1/1/21
local.edoc.container-publisher-nameBioMedCentral
local.edoc.container-volume1
local.edoc.container-issue21
local.edoc.container-year2012

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