TITLE

Extended-spectrum beta-lactamases in ceftazidime-resistant Escherichia coli and Klebsiella pneumoniae isolates in Turkish hospitals

AUTHOR(S)
Hoşoğlu, S.; Gündeş, S.; Kolayh, F.; Karadenizli, A.; Demirdağ, K.; Günaydın, M.; Altındis, M.; Çaylan, R.; Ucmak, H.; Hoşoğlu, S; Gündes, S; Kolayli, F; Demirdağ, K; Günaydin, M; Altindis, M; Caylan, R
PUB. DATE
October 2007
SOURCE
Indian Journal of Medical Microbiology;Oct2007, Vol. 25 Issue 4, p346
SOURCE TYPE
Academic Journal
DOC. TYPE
journal article
ABSTRACT
Purpose: To study the prevalence of TEM-, SHV- and GES-type beta -lactamases among Escherichia coli and Klebsiella pneumoniae strains having ceftazidime MICs higher than 2 mg/L.Methods: A total of 63 E. coli and 41 K. pneumoniae isolated from five different university hospitals were studied for the existence of TEM-, SHV- and GES-type beta -lactamases. Susceptibility tests were carried out according to the criteria of National Committee for Clinical Laboratory Standards. MICs were obtained by agar dilution method. Existence of extended-spectrum beta -lactamases (ESBLs) were assessed by double-disc synergy test (DDST). Existence of the above-mentioned beta -lactamase genes were studied both by PCR with specific oligonucleotide primers and isoelectric focusing methods.Results: None of the isolates were carbapenem-resistant. DDSTs were positive in 50 (79.3%) and 33 (80.5%) of E. coli and K. pneumoniae , respectively. TEM gene was detected in 41 (65.1%) and 19 (46.3%), whereas SHV gene in 18 (28.6%) and 20 (48.8%) of E. coli and K. pneumoniae strains, respectively. GES genes were not detected.Conclusions: TEM and SHV genes are highly prevalent among ESBL-producing E. coli and K. pneumoniae , whereas GES-type ESBLs are absent and found not to be responsible of ceftazidime resistance in Turkish hospitals.
ACCESSION #
28056834

 

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