[Prevalence of extended-spectrum beta-lactamases in nosocomial Escherichia coli and Klebsiella spp. strains isolated from blood cultures].

Abstract

The aim of this study was to determine the prevalence of extended-spectrum beta-lactamases (ESBLs) in nosocomial bacteremia isolates of Escherichia coli, Klebsiella pneumoniae and Klebsiella oxytoca at Hacettepe University Adult Hospital in Ankara, Turkey. A total of 344 blood culture isolates of E. coli (n=244), K. pneumoniae (n=86) and K. oxytoca (n=34) were included in the study from January 2003 to November 2005. Only one isolate from one patient was tested in the study. The isolates with ceftazidime and/or cefotaxime MIC values > or =1 microg/ml were tested by ceftazidime-ceftazidime/clavulanic acid and cefotaxime-cefotaxime/clavulanic acid Etest (AB Biodisk Solna, Sweden) strips and evaluated as ESBL positive if the ratio was > or =8. Of the isolates, 33% (74/224) of E. coli, 31.4% (27/86) of K. pneumoniae and 47% (16/34) of K. oxytoca were detected as ESBL producers by any kind of two strips. However, 5.4% (4/74) of E. coli, 3.7% (1/27) of K. pneumoniae and 43.1% (7/16) of K. oxytoca ESBL-producing isolates could be detected only by cefotaxime-cefotaxime/clavulanic acid strips. It is important to use cefotaxime-cefotaxime/clavulanic acid as well as ceftazidime-ceftazidime/clavulanic acid ratio for detection of ESBL types that preferentially hydrolyze cefotaxime. Since prevalence of ESBL production is high in nosocomial E. coli and Klebsiella spp. isolates in our hospital, surveillance of antibiotic susceptibility patterns is important for the empirical treatment of bacteremic patients.

• Authors: Pinar Zarakolu, Gökhan Metan, Gülşen Hasçelik, Murat Akova
• Journal: Mikrobiyoloji bulteni (Mikrobiyol Bul) Vol. 41 Issue 4 Pg. 579-84 (Oct 2007) ISSN: 0374-9096 [Print] Turkey
• Vernacular Title: Hastane enfeksiyonu etkeni olarak kan kültürlerinden izole edilen Escherichia coli ve Klebsiella spp. suşlarinda genişlemiş spektrumlu beta-laktamaz prevalansi.
• PMID: 18173077 (Publication Type: Journal Article)

Chemical References

• Anti-Bacterial Agents
• Drug Combinations
• Enzyme Inhibitors
• Clavulanic Acid
• Ceftazidime
• beta-Lactamases
• Cefotaxime

Topics

• Anti-Bacterial Agents (metabolism, pharmacology)
• Bacteremia (epidemiology, microbiology)
• Cefotaxime (metabolism, pharmacology)
• Ceftazidime (metabolism, pharmacology)
• Clavulanic Acid (metabolism, pharmacology)
• Cross Infection (epidemiology, microbiology)
• Drug Combinations
• Enzyme Inhibitors (metabolism, pharmacology)
• Escherichia coli (drug effects, enzymology, isolation & purification)
• Escherichia coli Infections (epidemiology, microbiology)
• Humans
• Klebsiella (drug effects, enzymology, isolation & purification)
• Klebsiella Infections (epidemiology, microbiology)
• Klebsiella oxytoca (drug effects, enzymology, isolation & purification)
• Klebsiella pneumoniae (drug effects, enzymology, isolation & purification)
• Microbial Sensitivity Tests
• Prevalence
• Turkey (epidemiology)
• beta-Lactamases (metabolism)