:: Volume 24, Issue 3 (Fall 2014) ::
MEDICAL SCIENCES 2014, 24(3): 148-152 Back to browse issues page
Identification of bla-CTX-M β-lactamase in Klebsiella pnumoniae clinical isolates by polymerase chain reaction
Najmeh Lashgari1 , Jalil Vand Yousefi2 , Seyed Davar Siadat 3, Fereshteh Shahcheraghi4 , Maryam Khosravi5 , Habib Vakili4 , Arfa Moshiri4 , Mehrangiz Zanganeh6 , Ahmad Reza Bahremand4
1- Ms.c of Microbiology, Islamic Azad University, Karaj Branch, Karaj, Iran
2- Islamic Azad University, Karaj Branch, Karaj, Iran
3- Department of Microbiology, Pasteur Institute of Iran, Tehran, Iran , d.siadat@gmail.com
4- Department of Microbiology, Pasteur Institute of Iran, Tehran, Iran
5- Department of Microbiology, Beasat Hospital, Tehran, Iran
6- Islamic Azad University, Tehran Medical Sciences Branch, Tehran, Iran
Abstract:   (8149 Views)
Background: The incidence of extended-spectrum β- lactamase- producing bacteria has been increased worldwide. The most common cause of resistance to extended-Spectrum cephalosporins in Klebsiella pneumoniae is the production of extended-spectrum beta lactamases (ESBLs). In the past decade, CTX-M enzymes have become the most prevalent ESBLs in Europe, Canada and Asia. The aim of this study was to find the prevalence of ESBL-producing K .pneumoniae and molecular detection of CTX-M group in these bacteria.
Materials and methods: In the descriptive study, 100 K. pneumoniae isolates were detected by standard biochemical tests between April 2012 and September 2012, in Besat and Imam Reza hospitals of Tehran, Iran. Susceptibility to antimicrobial agents was tested for 10 antibiotics by the disk agar diffusion (DAD) method. Also, ESBL production was screened by combined disk diffusionas recommended by the Clinical and Laboratory Standards Institute (CLSI). Then, Screened isolates were assayed by PCR for detection of CTX-M-1 group genes.
Results: Of 100 K. pneumonia isolates, 26 isolates produced ESBLs, and also 42 isolates were CTX-M-1 producer using PCR method.
Conclusion: According to the differences between the results of phenotypic and genotypic tests, it seems that molecular detection of drug-resistance genes is necessary. Further investigations are needed to determine the epidemiology of ESBL producing K. pneumoniae in Iran.
Keywords: Klebsiella pneumoniae, Extended spectrum beta lactamase, CTX-M
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Semi-pilot: Survey/Cross Sectional/Descriptive | Subject: Microbiology
Received: 2014/09/19 | Accepted: 2014/09/19 | Published: 2014/09/19

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Volume 24, Issue 3 (Fall 2014) Back to browse issues page