Journal
DIAGNOSTIC MICROBIOLOGY AND INFECTIOUS DISEASE
Volume 71, Issue 3, Pages 181-191Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.diagmicrobio.2011.06.017
Keywords
Melting curve analysis; beta-Lactamase; Detection; Escherichia coli
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Funding
- Czech Ministry of Health [IGA MZ CR 9950-3]
- Ministry of Education, Youth and Sports [MSM6198959223]
- Operational Programme Research and Development for Innovations [CZ.1.05/2.1.00/01.0030, LF_2011_002]
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A total of 78 bacterial strains with known beta-lactamases were used to optimize a rapid detection system consisting of multiplex polymerase chain reaction and melting curve analysis to amplify and identify blaTEM, blaSHV, and blaCTX-M genes in a single reaction. Additionally, to evaluate the applicability of this method, 32 clinical isolates of Escherichia coli displaying an extended-spectrum beta-lactamase phenotype from patients hospitalized at intensive care units were tested. Results were analyzed by the Rotor-Gene operating software and Rotor-Gene ScreenClust HRM Software. The individual melting curves differed by a temperature shift or curve shape, according to the presence of beta-lactamase genes. With the use of this method and direct sequencing, blaCTX-M-15-like was identified as the most prevalent beta-lactamase gene. In conclusion, this novel detection system seems to be a suitable tool for rapid detection of present beta-lactarnase genes and their characterization. (C) 2011 Elsevier Inc. All rights reserved.
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