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J Antimicrob Chemother. 2009 Oct;64(4):718-22. doi: 10.1093/jac/dkp272. Epub 2009 Aug 4.

Detection of aac(6')-Ib-cr in KPC-producing Klebsiella pneumoniae isolates from Tel Aviv, Israel.

Author information

1
Division of Epidemiology, Tel Aviv Medical Center, Tel Aviv, Israel. innach@tasmc.health.gov.il

Abstract

OBJECTIVES:

We aimed to evaluate the occurrence and characteristics of plasmid-mediated quinolone resistance (PMQR) genes in KPC-producing (KPC-P) Klebsiella pneumoniae (Kpn) isolates in Tel Aviv Medical Center, Israel.

METHODS:

Forty-seven KPC-P Kpn isolates were studied. Antibiotic susceptibilities were determined by Vitek 2, Etest or agar dilution. Beta-lactamases and PMQR determinants were detected by PCR. For plasmid characterization, transformation, transconjugation, restriction mapping and Southern blot analysis were performed.

RESULTS:

Six out of 47 (13%) KPC-P isolates carried aac(6')-Ib-cr. Acquisition of aac(6')-Ib-cr-encoding plasmids increased the MIC of ciprofloxacin by 2-fold. In five of six KPC-P isolates, aac(6')-Ib-cr and bla(KPC-2) were encoded on the same plasmid.

CONCLUSIONS:

The most prevalent PMQR gene in the studied KPC-P K. pneumoniae isolates is aac(6')-Ib-cr. The co-existence of PMQR genes with KPC on the same plasmid poses a serious epidemiological, clinical and public-health threat.

PMID:
19656782
DOI:
10.1093/jac/dkp272
[Indexed for MEDLINE]

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