title: Occurrence of extended-spectrum betalactamases (ESBL) in Dutch hospitals.
abstract: The prevalence of ESBL was determined among isolates of Escherichia coli (n = 571) and Klebsiella spp. (n = 196) collected during a 1-week study period in 8 university and 3 large regional laboratories all over the Netherlands. 18 isolates were positive for at least one of the screening tests used, i.e., VITEK-ESBL, E-test ESBL and MIC ratio of ceftazidime/ceftazidime-clavulanic acid, cefotaxime/cefotaxime-clavulanic acid. In 5 of these 18 putative ESBLs no betalactamase production was detectable. A TEM type was found in three E. coli and two Klebsiella spp. An SHV type was present in five Klebsiella spp. In one E. coli and one Klebsiella pneumoniae both enzymes were present. In one Klebsiella oxytoca neither of the two enzymes was present. Using PCR for both ESBL TEM and ESBL SHV, an SHV ESBL was found in one E. coli and four Klebsiella isolates. The mutations at position 238 and 240 were already described. In one E. coli isolate a TEM ESBL was found with three mutations, at position 21, 164 and 265. These mutations were already described in other ESBLs but not in this combination suggesting a new TEM ESBL. The overall prevalence of ESBL producing E. coli and Klebsiella spp. was less than 1% (6 out of 767).
authors.affiliation: University Hospital Maastricht, The Netherlands. EST@LMIB.AZM.NL
authors.forename: E E
authors.initials: EE
authors.lastname: Stobberingh
authors.forename: J
authors.initials: J
authors.lastname: Arends
authors.forename: J A
authors.initials: JA
authors.lastname: Hoogkamp-Korstanje
authors.forename: W H
authors.initials: WH
authors.lastname: Goessens
authors.forename: M R
authors.initials: MR
authors.lastname: Visser
authors.forename: A G
authors.initials: AG
authors.lastname: Buiting
authors.forename: Y J
authors.initials: YJ
authors.lastname: Debets-Ossenkopp
authors.forename: R J
authors.initials: RJ
authors.lastname: van Ketel
authors.forename: M L
authors.initials: ML
authors.lastname: van Ogtrop
authors.forename: L J
authors.initials: LJ
authors.lastname: Sabbe
authors.forename: G P
authors.initials: GP
authors.lastname: Voorn
authors.forename: H L
authors.initials: HL
authors.lastname: Winter
authors.forename: J H
authors.initials: JH
authors.lastname: van Zeijl
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001483:Base Sequence; D004926:Escherichia coli / Q000187:drug effects / Q000201:enzymology*; D004927:Escherichia coli Infections / Q000453:epidemiology / Q000382:microbiology; D005798:Genes, Bacterial / Q000235:genetics; D006801:Humans; D007525:Isoelectric Focusing; D007709:Klebsiella / Q000187:drug effects / Q000201:enzymology*; D007710:Klebsiella Infections / Q000453:epidemiology / Q000382:microbiology; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D009154:Mutation; D009426:Netherlands; D016133:Polymerase Chain Reaction; D001618:beta-Lactamases / Q000032:analysis / Q000235:genetics / Q000378:metabolism*
chemical_list: D000900:Anti-Bacterial Agents; D001618:beta-Lactamases