scholarly journals Carbapenem resistance mechanisms among blood isolates of Klebsiella pneumoniae and Escherichia coli

2016 ◽  
Vol 10 (2) ◽  
pp. 45-53 ◽  
Author(s):  
P Rahamathulla Mohamudha ◽  
N Harish Belgode ◽  
Mataseje Laura ◽  
R Mulvey Michael
Keyword(s):  
Escherichia Coli ◽  
Klebsiella Pneumoniae ◽  
Carbapenem Resistance ◽  
Resistance Mechanisms

scholarly journals In Vitro Synergism of Azithromycin Combination with Antibiotics against OXA-48-Producing Klebsiella pneumoniae Clinical Isolates

Antibiotics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1551
Author(s):  
Uthaibhorn Singkham-in ◽  
Netchanok Muhummudaree ◽  
Tanittha Chatsuwan
Keyword(s):  
Escherichia Coli ◽  
Klebsiella Pneumoniae ◽  
Outer Membrane Proteins ◽  
Carbapenem Resistance ◽  
Resistance Mechanisms ◽  
In Vitro Activity ◽  
Bacterial Regrowth ◽  
Antibiotic Development ◽  
Carbapenem Resistant

Carbapenem-resistant Klebsiella pneumoniae has globally emerged as an urgent threat leading to the limitation for treatment. K. pneumoniae carrying blaOXA-48, which plays a broad magnitude of carbapenem susceptibility, is widely concerned. This study aimed to characterize related carbapenem resistance mechanisms and forage for new antibiotic combinations to combat blaOXA-48-carrying K. pneumoniae. Among nine isolates, there were two major clones and a singleton identified by ERIC-PCR. Most isolates were resistant to ertapenem (MIC range: 2–>256 mg/L), but two isolates were susceptible to imipenem and meropenem (MIC range: 0.5–1 mg/L). All blaOXA-48-carrying plasmids conferred carbapenem resistance in Escherichia coli transformants. Two ertapenem-susceptible isolates carried both outer membrane proteins (OMPs), OmpK35 and OmpK36. Lack of at least an OMP was present in imipenem-resistant isolates. We evaluated the in vitro activity of an overlooked antibiotic, azithromycin, in combination with other antibiotics. Remarkably, azithromycin exhibited synergism with colistin and fosfomycin by 88.89% and 77.78%, respectively. Bacterial regrowth occurred after exposure to colistin or azithromycin alone. Interestingly, most isolates were killed, reaching synergism by this combination. In conclusion, the combination of azithromycin and colistin may be an alternative strategy in dealing with blaOXA-48-carrying K. pneumoniae infection during a recent shortage of newly effective antibiotic development.

scholarly journals Carbapenem resistance in Escherichia coli and Klebsiella pneumoniae among Indian and international patients in North India

2019 ◽  
Vol 66 (3) ◽  
pp. 367-376
Author(s):  
Namita Jaggi ◽  
Nirupama Chatterjee ◽  
Vyoma Singh ◽  
Santosh Kumar Giri ◽  
Priyambada Dwivedi ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Klebsiella Pneumoniae ◽  
Carbapenem Resistance ◽  
North India

scholarly journals Evaluation of the Bactericidal Activity of Plazomicin and Comparators against Multidrug-Resistant Enterobacteriaceae

2018 ◽  
Vol 62 (8) ◽  
Author(s):  
M. Thwaites ◽  
D. Hall ◽  
D. Shinabarger ◽  
A. W. Serio ◽  
K. M. Krause ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Klebsiella Pneumoniae ◽  
Bactericidal Activity ◽  
Minimum Bactericidal Concentration ◽  
Multidrug Resistant ◽  
Resistance Mechanisms ◽  
Next Generation ◽  
Content Type ◽  
Time Kill

ABSTRACT The next-generation aminoglycoside plazomicin, in development for infections due to multidrug-resistant (MDR) Enterobacteriaceae, was evaluated alongside comparators for bactericidal activity in minimum bactericidal concentration (MBC) and time-kill (TK) assays against MDR Enterobacteriaceae isolates with characterized aminoglycoside and β-lactam resistance mechanisms. Overall, plazomicin and colistin were the most potent, with plazomicin demonstrating an MBC50/90 of 0.5/4 μg/ml and sustained 3-log10 kill against MDR Escherichia coli, Klebsiella pneumoniae, and Enterobacter spp.

KPC-2 carbapenemase and DHA-1 AmpC determinants carried on the same plasmid in Enterobacter aerogenes

2014 ◽  
Vol 63 (3) ◽  
pp. 367-370 ◽  
Author(s):  
Shougang Kuai ◽  
Haifeng Shao ◽  
Lihua Huang ◽  
Hao Pei ◽  
Zhonghua Lu ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Klebsiella Pneumoniae ◽  
Clinical Isolate ◽  
Southern Blotting ◽  
Antimicrobial Agents ◽  
Resistance Mechanism ◽  
Enterobacter Aerogenes ◽  
Carbapenem Resistance ◽  
Jiangsu Province ◽  
Republic Of China

This study was conducted to analyse the presence of a plasmid-mediated carbapenem resistance mechanism in a clinical Enterobacter aerogenes isolate from a patient from Jiangsu province, People’s Republic of China. PCR and sequencing confirmed that the isolate harboured Klebsiella pneumoniae carbapenemase (KPC)-2, DHA-1 and TEM-1 β-lactamase genes. Both the KPC-2 and DHA-1 genes were transferred to Escherichia coli C600 by transconjugation, and Southern blotting confirmed that these two genes were located on the same plasmid, which was of approximately 56 kb in size. The Enterobacter aerogenes isolate was resistant to carbapenems and other tested antimicrobial agents. The Escherichia coli transconjugant showed reduced susceptibility but not resistance to carbapenems and other β-lactams, indicating the presence of another, possibly permeability-related, resistance mechanism in the clinical isolate.

scholarly journals Emergence of Serratia marcescens, Klebsiella pneumoniae, and Escherichia coli Isolates Possessing the Plasmid-Mediated Carbapenem-Hydrolyzing β-Lactamase KPC-2 in Intensive Care Units of a Chinese Hospital

2008 ◽  
Vol 52 (6) ◽  
pp. 2014-2018 ◽  
Author(s):  
Jia Chang Cai ◽  
Hong Wei Zhou ◽  
Rong Zhang ◽  
Gong-Xiang Chen
Keyword(s):  
Escherichia Coli ◽  
Intensive Care ◽  
Klebsiella Pneumoniae ◽  
Serratia Marcescens ◽  
Intensive Care Units ◽  
Gel Electrophoresis ◽  
Outer Membrane Proteins ◽  
Carbapenem Resistance ◽  
E Coli ◽  
Insertional Inactivation

ABSTRACT Twenty-one Serratia marcescens, ten Klebsiella pneumoniae, and one Escherichia coli isolate with carbapenem resistance or reduced carbapenem susceptibility were recovered from intensive care units (ICUs) in our hospital. Enterobacterial repetitive intergenic consensus-PCR and pulsed-field gel electrophoresis demonstrated that all the S. marcescens isolates belonged to a clonal strain and the 10 K. pneumoniae isolates were indistinguishable or closely related to each other. The MICs of imipenem, meropenem, and ertapenem for all isolates were 2 to 8 μg/ml, except for K. pneumoniae K10 (MICs of 128, 256, and >256 μg/ml). Isoelectric focusing, PCRs, and DNA sequencing indicated that all S. marcescens isolates produced KPC-2 and a β-lactamase with a pI of 6.5. All K. pneumoniae isolates produced TEM-1, KPC-2, CTX-M-14, and a β-lactamase with a pI of 7.3. The E. coli E1 isolate produced KPC-2, CTX-M-15, and a β-lactamase with a pI of 7.3. Conjugation studies with E. coli (EC600) resulted in the transfer of reduced carbapenem susceptibility compared to that of the original isolates, and only the bla KPC-2 gene was detected in E. coli transconjugants. Plasmid restriction analysis showed identical restriction patterns among all E. coli transconjugants. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and ompK35/36 gene sequence analysis of outer membrane proteins revealed that K. pneumoniae K10 failed to express OmpK36, because of insertional inactivation by an insertion sequence ISEcp1. All these results indicate that KPC-2-producing S. marcescens, K. pneumoniae, and E. coli isolates emerged in ICUs in our hospital. KPC-2 combined with porin deficiency results in high-level carbapenem resistance in K. pneumoniae. The same bla KPC-2-encoding plasmid was spread among the three different genera.

scholarly journals Ten years of population-level genomic Escherichia coli and Klebsiella pneumoniae serotype surveillance informs vaccine development for invasive infections

2020 ◽  
Author(s):  
Samuel Lipworth ◽  
Karina-Doris Vihta ◽  
Kevin K Chau ◽  
James Kavanagh ◽  
Timothy Davies ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Klebsiella Pneumoniae ◽  
Vaccine Development ◽  
Carbapenem Resistance ◽  
Bloodstream Infections ◽  
Population Level ◽  
Small Subset ◽  
Invasive Infections ◽  
Common Serotypes ◽  
O Antigens

The incidence of bloodstream infections (BSIs) caused by Enterobacteriaceae (e.g. Escherichia coli, Klebsiella pneumoniae) continues to increase globally and the threat of untreatable disease is substantial1. Prophylactic vaccines represent an alternative approach to combating antimicrobial resistance (AMR) by reducing antibiotic usage and preventing infections caused by AMR-associated strains. To investigate their potential utility, we performed in silico serotyping on 4035 E. coli/K. pneumoniae BSI from population-level surveillance in Oxfordshire (2008-2018) in addition to 3678 isolates from previous studies. Most infections, including those associated with AMR, were caused by isolates with a small subset of O-antigens, with no evidence that the proportion of BSIs caused by these changed significantly over time. O-antigen targeted vaccines might therefore be useful in reducing the significant morbidity and mortality2 associated with BSIs. Vaccines may also have a role in preventing the spread of carbapenem resistance genes into common serotypes associated with community-onset disease.

scholarly journals Detection of carbapenem-resistant Escherichia coli and Klebsiella pneumoniae producing NDM-1 in Lebanon

2012 ◽  
Vol 6 (05) ◽  
pp. 457-461 ◽  
Author(s):  
Rima I El-Herte ◽  
George F Araj ◽  
Ghassan M Matar ◽  
Maysa Baroud ◽  
Zeina A Kanafani ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Klebsiella Pneumoniae ◽  
Carbapenem Resistance ◽  
New Delhi ◽  
Beta Lactamase ◽  
The Novel ◽  
First Report ◽  
Carbapenem Resistant ◽  
Lactamase Gene ◽  
Carbapenem Resistant Enterobacteriaceae

Carbapenem resistance has been encountered globally with poor outcome of infected patients. NDM-1 (New Delhi metallo-beta-lactamase) gene containing organisms have emerged and are now spreading in all continents. This is the first report of Iraqi patients referred to Lebanon from whom carbapenem resistant Enterobacteriaceae were recovered. The genes involved in carbapenem resistance were bla-OXA-48   and the novel NDM-1. This report highlights the alarming introduction of such resistance among Enterobacteriaecae to this country.

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