Antibiotic Susceptibility Profile, ESBL Production and blaCTX-M1, blaSHV and blaTEM Types Among Escherichia coli Blood Isolates
Background: Plasmid and chromosomal extended-spectrum beta-lactamases (ESBLs) have been increasingly spread everywhere and blaCTX-M1 is one predominant beta-lactamase. Objectives: This study was fulfilled to determine the production of ESBL and prevalence of blaCTX-M1, blaSHV, and blaTEM among...
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Alborz University of Medical Sciences
2017-03-01
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doaj-434cfaef9ea946c3ae50602549cef1512020-11-24T22:21:28ZengAlborz University of Medical SciencesInternational Journal of Enteric Pathogens2345-33622322-58662017-03-015191210.15171/ijep.2017.03ijep-20161017102242Antibiotic Susceptibility Profile, ESBL Production and blaCTX-M1, blaSHV and blaTEM Types Among Escherichia coli Blood IsolatesFarshad Nojoomi0Abdolmajid Ghasemian1Majid Eslami2Sepideh Khodaparast3Microbiology Department, Faculty of Medicine, AJA University of Medical Sciences, Tehran, IranMicrobiology Department, Faculty of Medicine, AJA University of Medical Sciences, Tehran, IranDepartment of Bacteriology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, IranDepartment of Bacteriology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, IranBackground: Plasmid and chromosomal extended-spectrum beta-lactamases (ESBLs) have been increasingly spread everywhere and blaCTX-M1 is one predominant beta-lactamase. Objectives: This study was fulfilled to determine the production of ESBL and prevalence of blaCTX-M1, blaSHV, and blaTEM among Escherichia coli blood isolates in Tehran. Patients and Methods: Twenty-three isolates were adopted to be studied during 2015-2016. The antibiotic susceptibility testing was performed using Kirby–Bauer method. The combined disk method was used for the detection of phenotypic ESBL production. The most effective antibiotics were piperacillin, amikacin, and ofloxacin. The minimum inhibitory concentration (MIC) of ceftazidime was determined using micro-broth dilution method. Polymerase chain reaction (PCR) was used for detecting the blaCTX-M1, blaSHV, and blaTEM genes. Results: In the broth dilution test, 19 (82%) isolates showed MIC ≥1, and 18 (78.3%) isolates were ceftazidime resistant. In the combined disk test, 19 (82%) isolates were ESBL producers. The results of the MIC and ceftazidime resistance were the same for ESBL selection. The results of MIC, in fact confirmed the disk diffusion in determining the phenotypic ESBL production. The frequency of blaCTX-M1, blaSHV, and blaTEM genes among blood ESBL producing isolates was 26% (n = 6), 8.6% (n = 2), and 0%, respectively. Isolates that showed higher MIC were positive for these genes. Conclusion: The prevalence of multidrug-resistant blood isolates and ESBL phenotype was high in military hospitals. A low number of blood strains amplified blaCTXM1 and blaSHV type beta–lactamases. There was a relationship between the MIC and the presence of beta-lactamase genes.http://enterpathog.abzums.ac.ir/PDF/ijep-5-9.pdfBlood specimensEscherichia coliESBL Beta-lactamaseMultidrug resistance |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Farshad Nojoomi Abdolmajid Ghasemian Majid Eslami Sepideh Khodaparast |
spellingShingle |
Farshad Nojoomi Abdolmajid Ghasemian Majid Eslami Sepideh Khodaparast Antibiotic Susceptibility Profile, ESBL Production and blaCTX-M1, blaSHV and blaTEM Types Among Escherichia coli Blood Isolates International Journal of Enteric Pathogens Blood specimens Escherichia coli ESBL Beta-lactamase Multidrug resistance |
author_facet |
Farshad Nojoomi Abdolmajid Ghasemian Majid Eslami Sepideh Khodaparast |
author_sort |
Farshad Nojoomi |
title |
Antibiotic Susceptibility Profile, ESBL Production and blaCTX-M1, blaSHV and blaTEM Types Among Escherichia coli Blood Isolates |
title_short |
Antibiotic Susceptibility Profile, ESBL Production and blaCTX-M1, blaSHV and blaTEM Types Among Escherichia coli Blood Isolates |
title_full |
Antibiotic Susceptibility Profile, ESBL Production and blaCTX-M1, blaSHV and blaTEM Types Among Escherichia coli Blood Isolates |
title_fullStr |
Antibiotic Susceptibility Profile, ESBL Production and blaCTX-M1, blaSHV and blaTEM Types Among Escherichia coli Blood Isolates |
title_full_unstemmed |
Antibiotic Susceptibility Profile, ESBL Production and blaCTX-M1, blaSHV and blaTEM Types Among Escherichia coli Blood Isolates |
title_sort |
antibiotic susceptibility profile, esbl production and blactx-m1, blashv and blatem types among escherichia coli blood isolates |
publisher |
Alborz University of Medical Sciences |
series |
International Journal of Enteric Pathogens |
issn |
2345-3362 2322-5866 |
publishDate |
2017-03-01 |
description |
Background: Plasmid and chromosomal extended-spectrum beta-lactamases (ESBLs) have been increasingly spread everywhere and blaCTX-M1 is one predominant beta-lactamase.
Objectives: This study was fulfilled to determine the production of ESBL and prevalence of blaCTX-M1, blaSHV, and blaTEM among Escherichia coli blood isolates in Tehran.
Patients and Methods: Twenty-three isolates were adopted to be studied during 2015-2016. The antibiotic susceptibility testing was performed using Kirby–Bauer method. The combined disk method was used for the detection of phenotypic ESBL production. The most effective antibiotics were piperacillin, amikacin, and ofloxacin. The minimum inhibitory concentration (MIC) of ceftazidime was determined using micro-broth dilution method. Polymerase chain reaction (PCR) was used for detecting the blaCTX-M1, blaSHV, and blaTEM genes.
Results: In the broth dilution test, 19 (82%) isolates showed MIC ≥1, and 18 (78.3%) isolates were ceftazidime resistant. In the combined disk test, 19 (82%) isolates were ESBL producers. The results of the MIC and ceftazidime resistance were the same for ESBL selection. The results of MIC, in fact confirmed the disk diffusion in determining the phenotypic ESBL production. The frequency of blaCTX-M1, blaSHV, and blaTEM genes among blood ESBL producing isolates was 26% (n = 6), 8.6% (n = 2), and 0%, respectively. Isolates that showed higher MIC were positive for these genes.
Conclusion: The prevalence of multidrug-resistant blood isolates and ESBL phenotype was high in military hospitals. A low number of blood strains amplified blaCTXM1 and blaSHV type beta–lactamases. There was a relationship between the MIC and the presence of beta-lactamase genes. |
topic |
Blood specimens Escherichia coli ESBL Beta-lactamase Multidrug resistance |
url |
http://enterpathog.abzums.ac.ir/PDF/ijep-5-9.pdf |
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