Universal Primer Design for the Detection of Diverged CTX-M Extended-Spectrum β-Lactamases (ESBL) That Give Penicillin and Cephalosporin Resistance During Superbug Infections

2020 ◽  
pp. 45-60
Author(s):  
Asit Kumar Chakraborty ◽  
Kousik Poria ◽  
Sourav Kumar Nandi
Keyword(s):  
Primer Design ◽  
Universal Primer ◽  
Extended Spectrum ◽  
Cephalosporin Resistance

scholarly journals Molecular Characterization of a New Class 3 Integron in Klebsiella pneumoniae

2003 ◽  
Vol 47 (9) ◽  
pp. 2838-2843 ◽  
Author(s):  
Mário Correia ◽  
Filipa Boavida ◽  
Filipa Grosso ◽  
M. J. Salgado ◽  
L. M. Lito ◽  
...  
Keyword(s):  
Klebsiella Pneumoniae ◽  
Gene Cassette ◽  
Promoter Regions ◽  
Fusion Event ◽  
Integrase Gene ◽  
Gene Cassettes ◽  
New Class ◽  
Extended Spectrum ◽  
Class 1 ◽  
Cephalosporin Resistance

ABSTRACT Klebsiella pneumoniae FFUL 22K was isolated in April 1999 from the urine of an intensive care unit patient in Portugal. The strain showed an extended-spectrum cephalosporin resistance profile. A typical synergistic effect between cefotaxime or cefepime and clavulanic acid was observed. An Escherichia coli transformant displayed a similar resistance phenotype and harbored a ca. 9.4-kb plasmid (p22K9). Cloning experiments revealed that the extended-spectrum β-lactamase was encoded by bla GES-1, previously described in class 1 integrons from K. pneumoniae ORI-1 and Pseudomonas aeruginosa Pa695. Further sequence analysis demonstrated that the bla GES-1 gene cassette was located on a new class 3 integron. The integron was 2,863 bp long and consisted of an intI3 integrase gene, an attI3 recombination site, two promoter regions, and two gene cassettes. The IntI3 integrase was 98.8% identical to that of Serratia marcescens AK9373. The bla GES-1 gene cassette was inserted at the attI3 site. The second gene cassette was the result of a fusion event between bla OXA-10-type and aac(6′)-Ib gene cassettes and conferred resistance to kanamycin. This is the second class 3 integron reported and the first time that the bla GES-1 gene cassette has been found on an integron belonging to this class, highlighting the considerable heterogeneity of their genetic environment and the spread of gene cassettes among different classes of integrons.

scholarly journals Typhoid Fever due to Extended Spectrum β-Lactamase-Producing Salmonella enterica Serovar Typhi: A Case Report and Literature Review

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Abdul Azeez Ahamed Riyaaz ◽  
Vindya Perera ◽  
Sabaratnam Sivakumaran ◽  
Nelun de Silva
Keyword(s):  
Case Report ◽  
Sri Lanka ◽  
Typhoid Fever ◽  
Salmonella Enterica ◽  
Salmonella Enterica Serovar Typhi ◽  
Extended Spectrum ◽  
Cephalosporin Resistance ◽  
Resistant Strains ◽  
Derivatives Of

Emergence of cephalosporin-resistant strains of Salmonella enterica serovar Typhi is a cause of concern in the management of enteric fever. Cephalosporin resistance in Salmonella species is mainly due to the production of extended-spectrum β-lactamases (ESBLs). The majority of ESBLs in Salmonella enterica serovar Typhi are derivatives of the TEM, SHV, and CTX-M β-lactamase families. Of these, CTX-M appears to be predominant. This paper discusses the detection and molecular characterization of an ESBL-producing Salmonella enterica serovar Typhi strain isolated from a patient who was admitted to a private hospital in Sri Lanka. The three main types of β-lactamases such as TEM, SHV, and CTX-M were identified in this isolate. This case report from Sri Lanka contributes to the knowledge of the increasingly reported cases of typhoid fever due to Salmonella enterica serovar Typhi resistant to β-lactamase by ESBL production.

scholarly journals UniPrime: a workflow-based platform for improved universal primer design

2008 ◽  
Vol 36 (10) ◽  
pp. e56-e56 ◽  
Author(s):  
Michaël Bekaert ◽  
Emma C. Teeling
Keyword(s):  
Primer Design ◽  
Universal Primer

scholarly journals Effect of ceftiofur cessation and substitution with lincomycin-spectinomycin on extended-spectrum-beta-lactamase/AmpC genes and multidrug resistance in E. coli from a Canadian broiler production pyramid

2019 ◽  
Author(s):  
L. Verrette ◽  
J. M. Fairbrother ◽  
M. Boulianne
Keyword(s):  
Multidrug Resistance ◽  
Multidrug Resistant ◽  
Poultry Production ◽  
Extended Spectrum Beta Lactamase ◽  
E Coli ◽  
Extended Spectrum ◽  
High Prevalence ◽  
Cephalosporin Resistance ◽  
One Year ◽  
The Impact

AbstractCeftiofur, a cephalosporin antimicrobial, was used systematically in Canadian hatcheries for many years to prevent early mortality in chicks leading to a high prevalence of cephalosporin resistance in Escherichia coli in chickens. Preventive use of ceftiofur in hatcheries ceased in 2014. We examined the effect of ceftiofur cessation and replacement with lincomycin-spectinomycin at the hatchery on the proportion of E. coli positive for extended-spectrum β-lactamase (ESBL) and AmpC β-lactamase related genes, and on the multidrug resistance profiles of ESBL/AmpC positive E. coli in broilers and their associated breeders, at one year post-cessation. For indicator E. coli from non-enriched media, a significant decrease post-cessation in the proportion of samples harboring E. coli isolates positive for blaCMY-2 and/or blaCTX-M was observed. In contrast, following enrichment in medium containing ceftriaxone (1mg/L) to facilitate recovery of ESBL/AmpC β-lactamase producing E. coli colonies, both pre- and post-cessation, 99% of the samples harbored E. coli positive for blaCMY-2 or blaCTX-M. Flocks receiving lincomycin-spectinomycin after cessation of ceftiofur showed a significantly greater non-susceptibility to aminoglycoside, folate inhibitor, phenicol, tetracycline and possible extensively drug resistant E. coli compared to those receiving ceftiofur or no antimicrobial at hatchery. This study clearly demonstrates an initial decrease in ESBL/AmpC positive E. coli following the cessation of ceftiofur in hatchery but an increase in multidrug resistant E. coli following replacement with lincomycin-spectinomycin.ImportanceAntimicrobial resistance is a global problem. The antimicrobial ceftiofur has been used worldwide for disease prevention in poultry production resulting in a greatly increased resistance to this antimicrobial important in poultry and human medicine. Our study examines the impact of ceftiofur cessation and its replacement with the antimicrobial combination lincomycin-spectinomycin, a common practice in the industry. Our study demonstrated a decrease in ceftiofur resistance after the cessation of its use, although the resistance genes remain ubiquitous in all phases of poultry production, showing that poultry remains a reservoir for ceftiofur resistance and requiring continued vigilance. We also observed a decrease in multidrug resistance after cessation of ceftiofur although the contrary finding following use of lincomycin-spectinomycin indicates that the use of these antimicrobials should be questioned. Reduced resistance to ceftiofur in poultry may translate to better treatment efficacy, decreased morbidity, mortality, duration and cost of hospitalization in humans.

scholarly journals Epidemiology and antimicrobial resistance characteristics of the ST131-H30 subclone among extraintestinal Escherichia coli collected from US children

2017 ◽  
Author(s):  
Arianna Miles-Jay ◽  
Scott J. Weissman ◽  
Amanda L. Adler ◽  
Veronika Tchesnokova ◽  
Evgeni V. Sokurenko ◽  
...  
Keyword(s):  
Regression Models ◽  
Medical Condition ◽  
E Coli ◽  
Extended Spectrum ◽  
Binomial Regression ◽  
Demographic Correlates ◽  
Cephalosporin Resistance ◽  
Us Children ◽  
Underlying Medical Condition ◽  
Control Study

AbstractBackgroundE. coli ST131-H30 is a globally important pathogen implicated in rising rates of multidrug resistance among E. coli causing extraintestinal infections. Previous studies have focused on adults, leaving the epidemiology of H30 among children undefined.MethodsWe used clinical data and isolates from a case-control study of extended-spectrum cephalosporin-resistant E. coli conducted at four US children’s hospitals to estimate the burden and identify host correlates of infection with H30. H30 isolates were identified using two-locus genotyping; host correlates were examined using log-binomial regression models stratified by extended-spectrum cephalosporin resistance status.ResultsA total of 339 extended-spectrum cephalosporin-resistant and 1008 extended-spectrum cephalosporin-susceptible E. coli isolates were available for analyses. The estimated period prevalence of H30 was 5.3% among all extraintestinal E. coli isolates (95% confidence interval [CI] 4.6%-7.1%); H30 made up 43.3% (81/187) of ESBL-producing isolates in this study. Host correlates of infection with H30 differed by extended-spectrum cephalosporin resistance status: among resistant isolates, age ≤5 years was positively associated with H30 infection (relative risk [RR] 1.83, 95% CI 1.19-2.83); among susceptible isolates, age ≤5 years was negatively associated with H30 (RR 0.48, 95% CI 0.27-0.87), while presence of an underlying medical condition was positively associated (RR 4.49, 95% CI 2.43-8.31).ConclusionsST131-H30 is less common among extraintestinal E. coli collected from children compared to reported estimates among adults, possibly reflecting infrequent fluoroquinolone use in pediatrics; however, it is similarly dominant among ESBL-producing isolates. The H30 subclone appears to disproportionately affect young children relative to other extendedspectrum cephalosporin-resistant E. coli.SummaryST131-H30 was responsible for 5.3% of all extraintestinal E. coli infections and 43.3% of ESBL-producing extraintestinal E. coli infections among US children. The clinical and demographic correlates of infection with ST131-H30 differed between extended-spectrum cephalosporin-resistant and -sensitive isolates.

scholarly journals International High-Risk Clones Among Extended-Spectrum β-Lactamase–Producing Escherichia coli in Dhaka, Bangladesh

2021 ◽  
Vol 12 ◽  
Author(s):  
Razib Mazumder ◽  
Arif Hussain ◽  
Ahmed Abdullah ◽  
Md. Nazrul Islam ◽  
Md. Tuhin Sadique ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
High Risk ◽  
Sequence Data ◽  
Diarrhoeal Disease ◽  
Resistance Mechanisms ◽  
Genome Comparison ◽  
E Coli ◽  
Extended Spectrum ◽  
Genome Phylogeny ◽  
Cephalosporin Resistance

Background:Escherichia coli is a major extended-spectrum β-lactamase (ESBL)–producing organism responsible for the rapid spread of antimicrobial resistance (AMR) that has compromised our ability to treat infections. Baseline data on population structure, virulence, and resistance mechanisms in E. coli lineages from developing countries such as Bangladesh are lacking.Methods: Whole-genome sequencing was performed for 46 ESBL–E. coli isolates cultured from patient samples at the International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b)-Dhaka. Sequence data were analyzed to glean details of AMR, virulence, and phylogenetic and molecular markers of E. coli lineages.Results: Genome comparison revealed presence of all major high-risk clones including sequence type 131 (ST131) (46%), ST405 (13%), ST648 (7%), ST410 (4.3%), ST38 (2%), ST73 (2%), and ST1193 (2%). The predominant ESBL gene and plasmid combination were blaCTX–M–15 and FII-FIA-FIB detected in diverse E. coli phylogroups and STs. The blaNDM–5 (9%) gene was present in prominent E. coli STs. One (2%) mcr-1–positive ST1011 E. coli, coharboring blaCTXM–55 gene, was detected. The extraintestinal pathogenic E. coli genotype was associated with specific E. coli lineages. The single nucleotide polymorphism (SNP)-based genome phylogeny largely showed correlation with phylogroups, serogroups, and fimH types. Majority of these isolates were susceptible to amikacin (93%), imipenem (93%), and nitrofurantoin (83%).Conclusion: Our study reveals a high diversity of E. coli lineages among ESBL-producing E. coli from Dhaka. This study suggests ongoing circulation of ST131 and all major non-ST131 high-risk clones that are strongly associated with cephalosporin resistance and virulence genes. These findings warrant prospective monitoring of high-risk clones, which would otherwise worsen the AMR crises.

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