Molecular Epidemiology of Beta-Lactamases in Ceftazidime-Resistant Pseudomonas aeruginosa Isolates

2015 ◽  
Vol 49 (2) ◽  
pp. 156-165 ◽  
Author(s):  
Halil ER ◽  
Mustafa ALTINDİŞ ◽  
Gülşah AŞIK ◽  
Cengiz DEMİR
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Molecular Epidemiology ◽  
Beta Lactamases

scholarly journals 132 Molecular epidemiology and dynamics of chronic Pseudomonas aeruginosa populations in Cystic Fibrosis lungs

2006 ◽  
Vol 5 ◽  
pp. S30
Author(s):  
L. Jelsbak ◽  
A. Frost ◽  
H.K. Johansen ◽  
L. Thomsen ◽  
L. Yang ◽  
...  
Keyword(s):  
Cystic Fibrosis ◽  
Pseudomonas Aeruginosa ◽  
Molecular Epidemiology

scholarly journals Molecular Epidemiology of a Pseudomonas aeruginosa Hospital Outbreak Driven by a Contaminated Disinfectant-Soap Dispenser

PLoS ONE ◽  
2011 ◽  
Vol 6 (2) ◽  
pp. e17064 ◽  
Author(s):  
Simone Lanini ◽  
Silvia D'Arezzo ◽  
Vincenzo Puro ◽  
Lorena Martini ◽  
Francesco Imperi ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Molecular Epidemiology ◽  
Hospital Outbreak

Molecular epidemiology and mechanisms of carbapenem resistance in Pseudomonas aeruginosa isolates from Chinese hospitals

2010 ◽  
Vol 35 (5) ◽  
pp. 486-491 ◽  
Author(s):  
Jie Wang ◽  
Jian-ying Zhou ◽  
Ting-ting Qu ◽  
Ping Shen ◽  
Ze-qing Wei ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Molecular Epidemiology ◽  
Carbapenem Resistance

scholarly journals Metallo-Beta-Lactamases in Nosocomial Pseudomonas aeruginosa Isolates

2014 ◽  
Author(s):  
Görkem YAMAN ◽  
Aytekin ÇIKMAN ◽  
Mehmet PARLAK ◽  
Hüseyin GÜDÜCÜOĞLU ◽  
Mustafa BERKTAŞ
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Beta Lactamases

scholarly journals Investigation of Metallo-Beta-Lactamases in Carbapenem Resistant Pseudomonas aeruginosa Strains by Phenotypic and Genotypic Methods

2020 ◽  
Vol 25 (3) ◽  
pp. 301-307
Author(s):  
M. Duygu Aksoy ◽  
H. Murat Tuğrul
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Ethylenediaminetetraacetic Acid ◽  
Carbapenem Resistance ◽  
Beta Lactamase ◽  
Bacterial Strains ◽  
Beta Lactamases ◽  
Carbapenem Resistant ◽  
Synergy Test ◽  
Phenotypic Tests ◽  
Positive Controls

Introduction: Carbapenem resistant Pseudomonas aeruginosa strains cause serious problems in treatment. A large number of identified metallo-beta-lactamase (MBL) enzymes produced by P. aeruginosa are one of the most important mechanisms in resistance to carbapenems. MBL genes are located on the chromosome or plasmid, and they can easily spread between different bacterial strains. The activities of these enzymes are zinc-dependent, and they are inhibited by ethylenediaminetetraacetic acid (EDTA). Therefore, this advantage is used in MBL identification tests. In this study, it was aimed to determine MBL among P. aeruginosa strains. Materials and Methods: MBL existence was investigated in 35 P. aeruginosa strains accepted to be mildly susceptible/resistant to any of the carbapenem group of antibiotics through phenotypic and genotypic methods. Phenotypic tests were performed as double disk synergy test (DDST), combined disk diffusion tests (CDDT) by using 0.1 M and 0.5 M EDTA, MBL E-test, and modified Hodge test (MHT). blaIMP, blaVIM, blaGIM, blaSIM, blaSPM genes and blaNDM gene were investigated by multiplex polimerase chain reaction (PCR) and PCR, respectively. Escherichia coli ATCC 25922 and P. aeruginosa ATCC 27853 standard bacteria were used in tests. VIM-1, VIM-2, IMP-13, SPM-1, NDM-1 type MBL-producing P. aeruginosa strains were used as positive controls. Results: Among the carbapenems resistant P. aeruginosa isolates, positivity of MBL was found as 54.2% by MBL E-test, 42.8% by DDST, 94.2% and 37.1% by CDDT method using 0.5 M and 0.1 M EDTA, respectively. Modified Hodge test and genotypic method did not detect MBL. Conclusion: In order to correctly evaluate the results of the phenotypic method, the investigation of resistance genes by molecular methods is also required. The most common metallo-beta-lactamase enzymes responsible for resistance to carbapenem in Pseudomonas were not observed. It was thought that different mechanisms might be responsible for the identified carbapenem resistance.

First Detection of OXA-10 Extended-Spectrum Beta-Lactamases and the Occurrence of mexR and nfxB in Clinical Isolates of Pseudomonas aeruginosa from Nigeria

Chemotherapy ◽  
2015 ◽  
Vol 61 (2) ◽  
pp. 87-92 ◽  
Author(s):  
Bamidele T. Odumosu ◽  
Bola A. Adeniyi ◽  
Ram Chandra
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Efflux Pump ◽  
Clinical Isolates ◽  
Beta Lactamases ◽  
First Report ◽  
Extended Spectrum ◽  
Pcr Rflp ◽  
Extended Spectrum Beta Lactamases ◽  
Regulator Genes

Background: The characterization of β-lactamase production in Pseudomonasaeruginosa is rarely reported in Nigeria. The objective of this study was to investigate the occurrence and characterize the different β-lactamases as well as mechanisms of fluoroquinolones resistance among P. aeruginosa isolated from various clinical sources from Nigeria. Materials and Method: Isolates were investigated using PCR, RFLP and sequencing for the detection of various β-lactamases and efflux pump regulator genes. Result: The prevalence of OXA-10, AmpC, CTX-M and SHV in P. aeruginosa was 80, 70, 5 and 5%, respectively. The coexistence of blaOXA-10 with blaAmpC, blaSHV and blaCTX-M was reported in 40, 5 and 5% of isolates, respectively. The efflux pump regulator genes mexR and nfxB were both amplified in 45% of the OXA-10-positive isolates. Conclusion: This is the first report of the characterization of OXA-10 extended-spectrum β-lactamases and occurrence of mexR and nfxB efflux regulator genes in clinical isolates of P. aeruginosa in Nigeria.

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