Carriage of Extended Spectrum Beta-Lactamase and Carbapenemase Genes in Food Animals and Their Human Handlers: A One Health Perspective in a Low-Resource Setting in Africa.

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We investigated fecal colonization with third-generation cephalosporin-resistant (3GC-r) Enterobacterales and carbapenem-resistant Enterobacterales among food animals and their handlers in Ghana. A total of 252 fecal samples were collected from 211 animals and 41 human handlers across 20 farms between May and August 2023. Enterobacterales were isolated using standard methods and identified using Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry fingerprints and 16SrRNA sequencing. Antibiotic susceptibility testing was done using standard methods. Extended spectrum beta-lactamase (ESBL) and carbapenemase genes were identified by PCR and sequencing. A total of 264 Enterobacterales were isolated, comprising 44 from human handlers and 220 from food animals. Among human isolates, 31 (70.5%) were 3GC-r, with 9 (20.5%) expressing the ESBL phenotype and 2 (4.5%) producing carbapenemases. The most common ESBL genes detected were blaCTX-M-15 (n = 5/9) and blaCTX-M-14 (n = 2/9), while carbapenemase-producing isolates harbored blaNDM-1 (n = 1/2) or blaIMP-1 (n = 1/2). In food animals, 94 (42.7%) of Enterobacterales isolates were 3GC-r, with 11 (5.0%) carrying ESBL genes, predominantly blaCTX-M-15 (n = 5/11). One E. coli isolate exhibited carbapenemase production (blaNDM-1) with an ESBL gene (blaCTX-M-1). Meropenem was the most effective antibiotic agent against the study isolates (≤5% resistance). Concordance of isolate/resistance gene combinations was observed at three farms where at least one human handler and at least one farm animal carried the same 3GC-r Escherichia coli with the same resistance genes, including blaCTX-M-15, blaTEM-10, and blaNDM-1. The findings indicate a potential for zoonotic transmission of resistance genes between food animals and their human handlers.

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  • Abstract
  • 10.1093/ofid/ofae631.1520
P-1343. Extended Spectrum Beta Lactamases (ESBL) and New Delhi Metallo Protein (NDM) genes co-occurrence in Phenotypic ESBL Enterobacteriaceae (ESBL-E) isolates causing community-acquired pyelonephritis
  • Jan 29, 2025
  • Open Forum Infectious Diseases
  • Deepak Kumar + 8 more

BackgroundMultidrug resistance Enterobacteriaceae causing community-acquired pyelonephritis is an emerging threat; most isolates are EBSL, as per Indian data. After the results of the MERINO trial, most guidelines favors Carbapenem for treating community-acquired pyelonephritis. Overuse of carbapenem may lead to Carbapenem resistance Enterobacteriaceae (CRE) in the community. We analyzed the ESBL and CRE genes in the clinically significant urinary isolates with phenotypic ESBL -E from patients with community-acquired pyelonephritis.Table 1Demographic characteristics of patients with community-acquired acute pyelonephritis caused by phenotypic ESBL -E.MethodsPatients with a diagnosis of community-acquired acute pyelonephritis with age ≥ 18 years and urine culture showing the growth of Enterobacteriaceae with phenotypic ESBL-E are included in the study. If urine culture grew more than one organism in Enterobacteriaceae, other GNBs were excluded. The phenotypic ESBL detection was based on resistance to a third-generation cephalosporin (Cefotaxime, Cefpodoxime, Ceftazidime) and a monobactam (Aztreonam). These positive isolates were further processed using the combination disk method. A ≥5mm increase in zone diameter for either antimicrobial agent tested in combination with clavulanate vs the zone diameter of the agent when tested alone was considered ESBL (Clinical and Laboratory Standards Institute (CLSI) Performance standards for antimicrobial susceptibility tests). Simultaneously, multiplexed Real-time PCR (TRUPCR® UTI AST Panel Kit, Europe) was done to detect ESBL genes (CTX-M, TEM, SHV) and CRE genes (OXA-48, KPC, NDM, VIM, IMP) in these isolates.Table 2:Detection of NDM genes with ESBL genes in patients with community-acquired acute pyelonephritis caused by phenotypic ESBL -E.ResultsA total of 38 isolates with phenotypic ESBL in patients diagnosed with community-acquired pyelonephritis were processed for RT-PCR, and 30 were detected with ESBL and CRE genes. The demographic and clinical characteristics are shown in Table 1. The most common ESBL gene was CTX-M 29 (.96.7%) followed by TEM 25 (83.3%). Multiple ESBL genes were detected in 24(80%) isolates. Among CRE genes, the NDM genes were detected in 15 (50%) isolates with other ESBL genes (Table 2).ConclusionThe presence of CRE genes in phenotypic ESBL -E in community-acquired acute pyelonephritis could be due to the injudicious use of carbapenem. This may imply that CRE will be spread in the community in the future, making it difficult to manage this infection.DisclosuresAll Authors: No reported disclosures

  • Research Article
  • 10.9734/mrji/2020/v30i630232
First Detection of the Plasmid-Mediated Quinolone Resistance Determinants qnrB, qnrS and aac(6’)-Ib-cr in Extended Spectrum Beta-Lactamases-producing Klebsiella pneumonia in Bouaké, Côte d’Ivoire
  • Jul 22, 2020
  • Microbiology Research Journal International
  • Augustin E Anoh + 9 more

Aims: The aims of the present study were to investigate the presence of Plasmid-Mediated Quinolone Resistance (PMQR) determinants and the association of these determinants with Extended Spectrum Beta-Lactamases (ESBLs) genes in ESBL-producing Klebsiella pneumoniae isolates from Teaching Hospital of Bouaké, Côte d’Ivoire.
 Study Design: It is a retrospective study.
 Place of Study: Bacteriology-Virology Laboratory of Teaching Hospital, Bouaké, Côte d'Ivoire.
 Methodology: From January 2015 to December 2016, 96 ESBL-producing Klebsiella pneumoniae isolates were collected from several specimens. Antimicrobial susceptibility of isolates was tested using the standard disk-diffusion method on Mueller-Hinton and interpretation according to recommendations of the 2017 EUCAST. These isolates analyzed for the detection of ESBL (blaCTX-M, blaTEM and blaSHV) and PMQR genes (aac(6’)-Ib-cr, qnrB and qnrS) using simplex PCR.
 Results: Of the 96 ESBL-producing strains, 85 (88.55%) harbored at least one of the ESBL genes tested. Out of the 85 strains encoding ESBL genes, 96.47% carried blaCTX-M and 92.94% blaSHV and blaTEM genes. Eighty nine (89.6%) of the 96 ESBL producing-isolates were resistant to ciprofloxacin and 84.4% to norfloxacin. Among the 96 strains, 80 (83.33%) were found harboring at least one PMQR gene consisting of 78 (81.3%) aac(6’)-Ib-cr, 61 (63.5%) qnrB and 15 (15.6%) qnrS. Among the PMQR-positive strains, 68.4% coharbored qnrB+acc(6’)-Ib-cr genes, 10.5% qnrB+qnrS+acc(6’)-Ib-cr and 6.6% qnrS+acc(6’)-Ib-cr. The qnrB gene was always linked to aac(6’)-Ib-cr gene. Aac(6’)-Ib-cr gene showed the highest association with three ESBL genes (87.6%), followed by qnrB gene (70.6%), then qnrS (17.7%).
 Conclusion: The PMQR genes were highly prevalent in ESBL-producing Klebsiella pneumoniae, primarily the aac(6’)-Ib-cr gene. The high associated was observed between ESBL and PMQR genes, notably with the aac(6’)-Ib-cr gene.

  • Research Article
  • 10.47430/ujmr.2491.015
Evaluation of Co-production of Colistin Resistance and ESBL Genes among Gram-negative Clinical Isolates from Usmanu Danfodiyo University Teaching Hospital Sokoto, Nigeria
  • Jun 30, 2024
  • UMYU Journal of Microbiology Research (UJMR)
  • Tanko Nuhu + 2 more

Study’s Excerpt/Novelty This study presents a comprehensive evaluation of colistin-resistant and extended-spectrum beta-lactamase (ESBL) gene co-production among Gram-negative clinical isolates from Usmanu Danfodiyo University Teaching Hospital in Sokoto. Notably, 13.9% of the isolates exhibited phenotypic co-production of colistin resistance and ESBL, with a significant presence of blaCTX-M and CTX-M 8 genes among ESBL producers, although no colistin resistance genes (mcr-1 and mcr-2) were detected via PCR. These findings highlight the necessity for integrated molecular and phenotypic investigations to fully elucidate resistance mechanisms in Gram-negative bacteria and underscore the need for further research to uncover alternative pathways contributing to observed resistance phenotypes. Full Abstract The emergence of antimicrobial resistance (AMR) is a major threat to global health. Its effects include high mortality and morbidity rates, treatment failure, and increased treatment costs. This study aimed to evaluate the co-production of colistin-resistant and extended-spectrum beta-lactamase (ESBL) genes among Gram-negative clinical isolates from Usmanu Danfodiyo University Teaching Hospital in Sokoto. Gram-negative bacteria were isolated from clinical specimens, including urine, feces, and wound aspirates. The Double-Disk Synergy Test and the Colistin Agar Test, respectively, were used to phenotypically validate the existence of colistin resistance and ESBL. Polymerase chain reaction (PCR) was used for molecular characterization. Primers were used to target genes linked to colistin resistance (mcr-1 and mcr-2) and ESBL genes (blaCTX-M, CTX-M 1, CTX-M 2, and CTX-M 8). The findings indicated that 13.9% of the isolates displayed co-production of Colistin and ESBL, and of these isolates, 60% had blaCTX-M genes, and 20% had CTX-M 8 linked to ESBL production. However, the presence of colistin resistance genes was not detected by PCR. Therefore, molecular analysis did not confirm the existence of the colistin resistance genes (mcr-1 and mcr-2) in these isolates. Consequently, the findings showed no molecular co-production of the ESBL and colistin resistance genes. This work emphasizes how crucial it is to look into molecular and phenotypic traits to completely comprehend how colistin resistance and ESBL genes coexist in Gram-negative isolates. More research is required to investigate other mechanisms behind the resistance phenotypes identified.

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  • Cite Count Icon 9
  • 10.1007/s10096-013-1855-3
Differences in the antibiotic susceptibility of human Escherichia coli with poultry-associated and non-poultry-associated extended-spectrum beta-lactamases
  • Mar 22, 2013
  • European Journal of Clinical Microbiology & Infectious Diseases
  • T N Platteel + 8 more

The concurrent presence of bla CTX-M-1 and bla TEM-52 genes on similar plasmids of Escherichia coli isolated from poultry, chicken meat and humans supports the occurrence of food-borne transmission of extended-spectrum beta-lactamase (ESBL) genes. ESBL-producing E. coli (ESBL-E. coli) are most frequently detected in hospitalised patients and are known to spread in healthcare settings. We hypothesised that poultry-associated (PA) ESBL genes are predominant in the community, where acquisition is fuelled by food contamination, whereas non-PA ESBL genes are predominant in hospitals, with acquisition fuelled by cross-transmission. Then, differences in antimicrobial selective pressure in hospitals and poultry would create differences in co-resistance between PA and non-PA ESBL-E. coli. We, therefore, determined the prevalence and co-resistance of PA and non-PA ESBL-E. coli in community-acquired and nosocomial urinary tract infections in humans and bla CTX-M-1 and bla TEM-52 isolates from poultry. A total of 134 human ESBL-E. coli urine isolates were included in this study. Isolates containing bla CTX-M-1 or bla TEM-52 were considered to be PA, with the remainder being non-PA. Also, 72 poultry ESBL-E. coli were included. Minimum inhibitory concentration (MIC) values were determined by broth microdilution. The prevalence of PA ESBL genes in isolates obtained in general practice and hospitals was 28% versus 30% (n.s.). Human PA ESBL-E. coli were more frequently susceptible to ciprofloxacin (51% vs. 25%; p = 0.0056), gentamicin (86% vs. 63%; p = .0.0082), tobramycin (91% vs. 34%; p = 0.0001) and amikacin (98% vs. 67%; p = 0.0001) compared to human non-PA ESBL-E. coli. PA ESBL-E. coli are not more prevalent in community acquired than nosocomial urine samples, but are more often susceptible to ciprofloxacin and aminoglycosides than non-PA ESBL-E. coli. This does not support the existence of different reservoirs of ESBL genes.

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  • Cite Count Icon 4
  • 10.1016/j.jhin.2011.08.005
Distribution of extended-spectrum beta-lactamase genes using a commercial DNA micro-array system
  • Sep 29, 2011
  • Journal of Hospital Infection
  • R.H.T Nijhuis + 6 more

Distribution of extended-spectrum beta-lactamase genes using a commercial DNA micro-array system

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  • Cite Count Icon 20
  • 10.21037/apm.2019.09.11
Tigecycline in combination with other antibiotics against clinical isolates of carbapenem-resistant Klebsiella pneumoniae in vitro.
  • Nov 1, 2019
  • Annals of Palliative Medicine
  • Jisheng Zhang + 8 more

To investigate the activity of 5 antibiotic monotherapies, including colistin (COL), meropenem (MEM), amikacin (AMK), levofloxacin (LEV), and tigecycline (TGC), when combined with 4 other antibiotics against clinical isolates of carbapenem-resistant Klebsiella pneumoniae (CRKP) in vitro. The minimum inhibitory concentrations (MICs) of 5 antibiotics against 40 CRKP isolates were determined by micro-broth dilution method. There were synergistic effects between TGC combinations in the 10 CRKP isolates detected with checkerboard microdilution method. Time-kill assay was used to assess the monotherapies and the TGC combinations against 4 distinct sequence typing (STs) CRKP isolates. Polymerase chain reaction (PCR) tests were used to detect the carbapenemase genes, extended-spectrum beta lactamase (ESBL) genes, colistin resistance gene, and quinolone resistance genes, while multilocus sequence typing (MLST) was performed for 10 CRKP isolates. The MICs of TGC, COL, MEM, AMK, and LEV were 0.5-2, 2-32, 4-256, 1-16,384, and 0.5-64 µg/mL, respectively. The combinations exerted a significant synergism or additive effect via the checkerboard technique for most tested CRKP isolates, but a portion of the CRKP isolates had an indifferent effect except for the TGC-AMK combination. In addition, time-kill assays revealed that TGC enhanced the bactericidal activity of the 4 other antibiotics. Among 10 CRKP isolates, blaKPC-2 (90%), blaSHV (100%), and blaacc(6')-Ib (100%) were the most common carbapenemase genes, ESBL genes, and quinolone resistance genes, respectively. ST76 (70%) was the most predominant clone, followed by ST11 (10%), ST375 (10%), and ST530 (10%). In contrast to the currently recommended TGC therapy, our in vitro data suggest that TGC combinations may be a valid therapeutic option against CRKP, even in the presence of 1 antibiotic resistant isolate in TGC combination therapy. TGC-AMK combination is a cost-effective option for treating CRKP in the eastern region of Heilongjiang Province. In addition, TGC combinations might circumvent the overuse of carbapenems during the era of multi-drug resistance in Klebsiella pneumoniae (KP).

  • Research Article
  • 10.1016/j.bjid.2025.104554
Coexistence of PMQR and ESBL genes among clinical Escherichia coli isolates from community-acquired UTI in Mexicali, on the US-Mexico border
  • May 23, 2025
  • The Brazilian Journal of Infectious Diseases
  • Dolores A Marquez-Salazar + 9 more

Coexistence of PMQR and ESBL genes among clinical Escherichia coli isolates from community-acquired UTI in Mexicali, on the US-Mexico border

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  • Cite Count Icon 1
  • 10.2174/18742858-v16-e2201070
Molecular Study of Klebsiella Oxytoca Associated with Urinary Tract Infection in Children
  • Feb 3, 2022
  • The Open Microbiology Journal
  • Raghdaa Shrief + 3 more

Background:There are scarce reports about the association ofKlebsiella oxytoca(K. oxytoca) with urinary tract infection (UTI) in children. We aimed to evaluate the prevalence offimA, mrkA, matBandpilQadhesins genes and extended-spectrum beta-lactamase (ESBL) genesblaCTX-M, blaTEMandblaSHVby polymerase chain reaction (PCR) and to study biofilm formation and antibiotics resistance inK. oxytocafrom children with UTI.Methods:This study was a retrospective cross-sectional study that included 120 children with UTI due toK. oxytoca. The bacteria were subjected to molecular detection offimA, mrkA, matBandpilQadhesins genes and ESBL genesblaCTX-M, blaTEMandblaSHVby PCR. Biofilm capacity was determined by the microtiter plate method.Results:The isolatedK. oxytocahad positive ESBL activity in 45.8% of isolates. About 40% of isolates were biofilm producers. The frequency of adhesion genes amongK. oxytocawas 91.7%, 83.3%, 48.3% and 37.5% formatB, pilQ, fimAandmrkAgenes, respectively. For ESBL genes, the frequency was 38.3%, 36.7% and 33.3% forblaCTX-M, blaSHVandblaTEMgenes, respectively. The commonest genes among ESBL isolates wereblaCTX-M(83.6%),blaSHV(80%) thenblaTEMgene (72.7%). A significant association (p=0.048) was detected between ESBL activity and biofilm formation byK. oxytoca.Conclusion:Present study highlights the emergence ofK. oxytocaas a pathogen associated with UTI in children. There was a high prevalence of adhesin genes and ESBL genes among these isolates. The capacity ofK. oxytocato form biofilm was associated with ESBL production.

  • Research Article
  • Cite Count Icon 5
  • 10.1089/mdr.2019.0311
Rapid Detection of Genes Encoding Extended-Spectrum Beta-Lactamase and Carbapenemase in Clinical Escherichia coli Isolates with eazyplex SuperBug CRE System.
  • Jan 9, 2020
  • Microbial drug resistance (Larchmont, N.Y.)
  • Patrycja Zalas-Więcek + 2 more

Objectives: This study evaluated the diagnostic performance of the eazyplex® SuperBug CRE (eSBCRE) system, based on a loop-mediated isothermal amplification (LAMP), for the detection of the most common extended-spectrum beta-lactamases (ESBL) and carbapenemase genes in 140 clinical isolates of Escherichia coli. Materials and Methods: ESBL (blaCTX-M-1group and blaCTX-M-9group) and carbapenemase (blaKPC, blaVIM, blaNDM, blaOXA-48, and blaOXA-181) genes were detected using the eSBCRE test and compared with the results obtained by PCR, real-time PCR, and phenotypic methods. Results: Concordant results of 100% between PCR/real-time PCR and eSBCRE assays were observed. Two of 140 E. coli isolates were positive for both ESBL and carbapenemase genes according to eSBCRE, PCR, and real-time PCR assays, whereas they were negative in double-disk synergy test. Of 16 E. coli isolates suspected of producing carbapenemase, 9 were positive for 48-oxacillinases (OXA-48) by 30 μg temocillin test, whereas the blaOXA-48 was found only in 1 E. coli isolate by all molecular methods. Maximum threshold time values (minutes:seconds) in the eSBCRE test were 6:00, 11:15, 11:00, and 9:00 for the blaCTX-M-1group, blaCTX-M-9group, blaVIM, and blaOXA-48 genes, respectively. Conclusions: The eSBCRE test based on LAMP method is a reliable, easy-to-use, and timesaving molecular system, which can be successfully used in the routine diagnostic for the rapid detection of the most common ESBL and carbapenemase genes among clinical E. coli isolates.

  • Research Article
  • Cite Count Icon 32
  • 10.1186/s12941-020-00390-y
A high prevalence of multi-drug resistant Gram-negative bacilli in a Nepali tertiary care hospital and associated widespread distribution of Extended-Spectrum Beta-Lactamase (ESBL) and carbapenemase-encoding genes
  • Oct 21, 2020
  • Annals of Clinical Microbiology and Antimicrobials
  • Sulochana Manandhar + 9 more

BackgroundMulti-drug resistance (MDR) and extensive-drug resistance (XDR) associated with extended-spectrum beta-lactamases (ESBLs) and carbapenemases in Gram-negative bacteria are global public health concerns. Data on circulating antimicrobial resistance (AMR) genes in Gram-negative bacteria and their correlation with MDR and ESBL phenotypes from Nepal is scarce.MethodsA retrospective study was performed investigating the distribution of ESBL and carbapenemase genes and their potential association with ESBL and MDR phenotypes in E. coli, Klebsiella spp., Enterobacter spp. and Acinetobacter spp. isolated in a major tertiary hospital in Kathmandu, Nepal, between 2012 and 2018.ResultsDuring this period, the hospital isolated 719 E. coli, 532 Klebsiella spp., 520 Enterobacter spp. and 382 Acinetobacter spp.; 1955/2153 (90.1%) of isolates were MDR and half (1080/2153) were ESBL producers. Upon PCR amplification, blaTEM (1281/1771; 72%), blaCTXM-1 (930/1771; 53%) and blaCTXM-8 (419/1771; 24%) were the most prevalent ESBL genes in the enteric bacilli. BlaOXA and blaOXA-51 were the most common blaOXA family genes in the enteric bacilli (918/1771; 25%) and Acinetobacter spp. (218/382; 57%) respectively. Sixteen percent (342/2153) of all isolates and 20% (357/1771) of enteric bacilli harboured blaNDM-1 and blaKPC carbapenemase genes respectively. Of enteric bacilli, Enterobacter spp. was the most frequently positive for blaKPC gene (201/337; 60%). The presence of each blaCTX-M and blaOXA were significantly associated with non-susceptibility to third generation cephalosporins (OR 14.7, p < 0.001 and OR 2.3, p < 0.05, respectively).The presence of each blaTEM, blaCTXM and blaOXA family genes were significantly associated with ESBL positivity (OR 2.96, p < 0.001; OR 14.2, p < 0.001 and OR 1.3, p < 0.05 respectively) and being MDR (OR 1.96, p < 0.001; OR 5.9, p < 0.001 and OR 2.3, p < 0.001 respectively).ConclusionsThis study documents an alarming level of AMR with high prevalence of MDR ESBL- and carbapenemase-positive ESKAPE microorganisms in our clinical setting. These data suggest a scenario where the clinical management of infected patients is increasingly difficult and requires the use of last-resort antimicrobials, which in turn is likely to intensify the magnitude of global AMR crisis.

  • Research Article
  • 10.1099/mgen.0.001458
Molecular characterization and prevalence of plasmids co-harbouring mcr and ESBL genes
  • Jul 29, 2025
  • Microbial Genomics
  • K.M.G Houkes + 5 more

Multidrug-resistant Enterobacterales isolates carrying extended-spectrum beta-lactamases (ESBLs) and mobile colistin resistance (mcr) genes pose a significant healthcare threat as they can lead to difficult-to-treat infections. This study investigates the prevalence of isolates co-harbouring ESBL and mcr genes and characterizes the plasmids co-harbouring those genes. ESBL-producing Enterobacterales (ESBL-E) isolates identified during point prevalence surveys (PPS) in a Dutch hospital were screened for mcr genes. Plasmids co-harbouring mcr and ESBL genes were identified using long- and short-read sequencing data, while detecting resistance and replicon genes using AMRFinderPlus and PlasmidFinder. The plasmid database PLSDB was searched for plasmids containing the same mcr and ESBL gene(s), and SNP and DCJ-Indel distance analyses were conducted to examine plasmid diversity. The most recent common ancestor (MRCA) was inferred through timed phylogeny analyses in BEAST, and putative composite transposons containing the mcr or ESBL genes were identified. Among 188 screened ESBL-E, 11 harboured mcr genes: 9 with mcr-9 and 2 with mcr-9 and mcr-4.3. All plasmids containing mcr and ESBL genes were IncHI plasmids harbouring mcr-9, blaCTX-M-9 and/or blaSHV-12. The plasmid database search resulted in 128 similar plasmids. SNP analysis showed ≤10 SNPs among the PPS study plasmids and up to 924 SNPs among all plasmids. Structural relatedness and phylogenetic analyses revealed clustering of the PPS study plasmids but no additional taxonomical or geographical clustering. The MRCA of the PPS study plasmids likely emerged between 1986 and 2008. Finally, composite transposon analysis indicated that matching complete insertion sequences rarely flanked mcr-9 genes, whereas blaCTX-M-9 and blaSHV-12 frequently were. The prevalence of mcr genes among ESBL-E in this study is 5.9%, with mcr-9 being the most prevalent. Limited plasmid diversity suggests a single introduction event followed by regional and global dissemination across related bacterial species. Persistent ESBL gene mobility suggests a more recent introduction of these genes compared to the mcr-9 genes.

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  • Cite Count Icon 3
  • 10.3855/jidc.18116
Characterization of extended-spectrum beta-lactamase and carbapenemase genes in bacteria from environment in Burkina Faso.
  • Dec 31, 2023
  • The Journal of Infection in Developing Countries
  • Merci Muhigwa + 10 more

This study aimed to characterize extended-spectrum beta-lactamase (ESBL) and carbapenemase genes in bacteria from the environment in Bobo-Dioulasso, Burkina Faso. This study was conducted from January 18 to December 31, 2019. Environmental samples were collected from the effluents of Souro Sanou University Hospital Center and the wastewater treatment plant at Bobo-Dioulasso. MacConkey agar media supplemented with 4 µg/mL cefotaxime was used for bacterial growth, and identification of bacteria was performed using API 20E system (BioMerieux SA, Lyon, France). Antibiotic susceptibility testing, synergy test, carbapenem inactivation method and molecular characterization were performed. A total of 180 bacterial isolates were identified from the different sites with a predominance of Klebsiella oxytoca and Klebsiella pneumoniae (27.5%). All 180 bacterial isolates were ESBL producers and 18 (10.0%) of them produced carbapenemases. Out of the 180 bacterial isolates, DNAs of 98.9% (178/180) bacterial isolates were extracted and tested through polymerase chain reaction (PCR) for characterization of resistant genes. The study showed that 89.8% (160/178) carried the bla-CTX-M genes including 54.4 (87/160) from hospital effluents and 45.6 (73/160) from the wastewater treatment plant. Regarding the carriage of carbapenemase genes, 7.9 (14/178) blaNDM-1 was found in all the sites including 71.4% (10/14) from hospital effluents and 28.6 (4/14) from the wastewater treatment plant. blaOXA-48-like was only found in bacteria from hospital effluents and represented 2.2% (4/178). This study highlights the need to build hospital effluent treatment plants to reduce the load of resistant bacteria before discharging the effluents into the urban wastewater system.

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  • Cite Count Icon 3
  • 10.5897/ajmr2019.9137
English
  • Jul 31, 2019
  • African Journal of Microbiology Research
  • Yangkam Yhiler Nchawa + 5 more

This study investigated the co-carriage of plasmid mediated quinolone resistance (PMQR) and extended spectrum beta-lactamase (ESBL) producing lactose non-fermenting (LNF) Enterobacteriaceae isolated from poultry birds. This was a descriptive cross-sectional study carried out between September, 2016 and March, 2017. The Kirby-Bauer disk diffusion method was used to determine the antimicrobial susceptibility patterns. ESBL screening disc kit was used to detect ESBL activities. Detection of ESBL and PMQR genes was carried out by means of polymerase chain reaction. In total, 207 LNF Enterobacteriaeae isolates were recovered from the cloacal swabs of poultry birds within the Calabar Metropolis. ESBL-producing isolates were 162 (78.3%) while fluroquinolone resistant isolates were 194 (93.7%). Among the ESBL-producing isolates, resistance to Ciprofloxacin, Norfloxacin, Levofloxacin, Ofloxacin and Nalidixic acid was 55 (34.2%), 26 (16.1%), 35 (21.7%), 50 (31.1%), and 162 (100%), respectively. About 65% of the quinolone resistant isolates were positive for at least one of the PMQR and ESBL genes in this study. Strict antimicrobial screening, surveillance of resistant isolates as well as the judicious practice of antimicrobial administration in the poultry setting with special emphasis on fluoroquinolones is advised given the high prevalence of co-existent ESBL and PMQR genes. Key words: LNF enterobacteriaeae, Extended spectrum beta-lactamases, quinolone resistance

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  • Research Article
  • Cite Count Icon 4
  • 10.1186/s12879-024-09362-5
Molecular characterization of carbapenemase and extended spectrum beta-lactamase producing Acinetobacter baumannii isolates causing surgical site infections in Ethiopia
  • Apr 30, 2024
  • BMC Infectious Diseases
  • Seble Worku + 10 more

BackgroundAcinetobacter baumannii is an opportunistic pathogen that can cause a variety of nosocomial infections in humans. This study aimed to molecularly characterize extended-spectrum beta-lactamase (ESBL) producing and carbapenem-resistant Acinetobacter species isolated from surgical site infections (SSI).MethodsA multicentre cross-sectional study was performed among SSI patients at four hospitals located in Northern, Southern, Southwest, and Central parts of Ethiopia. The isolates were identified by microbiological methods and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). Antibiotic susceptibility was determined using disk diffusion. The presence of phenotypic ESBL and carbapenemase production was detected by employing standard microbiological tests, including combined disk diffusion (CDT). ESBL and carbapenem resistance determinants genes were studied by polymerase chain reaction (PCR) and sequencing.ResultsA total of 8.7% Acinetobacter species were identified from 493 culture-positive isolates out of 752 SSI wounds. The species identified by MALDI-TOF MS were 88.4% A. baumannii, 4.7% Acinetobacter pittii, 4.7% Acinetobacter soli, and 2.3% Acinetobacter lactucae. Of all isolates 93% were positive for ESBL enzymes according to the CDT. Using whole genome sequencing 62.8% of the A. baumannii harbored one or more beta-lactamase genes, and 46.5% harbored one or more carbapenemase producing genes. The distribution of beta-lactamases among Acinetobacter species by hospitals was 53.8%, 64.3%, 75%, and 75% at JUSH, TASH, DTCSH, and HUCSH respectively. Among ESBL genes, blaCTX−M alleles were detected in 21.4% of isolates; of these 83.3% were blaCTX−M−15. The predominant carbapenemase gene of blaOXA type was detected in 24 carbapenem-resistant A. baumannii followed by blaNDM alleles carried in 12 A. baumannii with blaNDM−1 as the most common.ConclusionsThe frequency of Acinetobacter species that produce metallobetalactamases (MBLs) and ESBLs that were found in this study is extremely scary and calls for strict infection prevention and control procedures in health facilities helps to set effective antibiotics stewardship.

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  • Research Article
  • 10.30574/gscbps.2022.19.3.0249
Prevalence of ESBL genes in Klebsiella pneumoniae from individuals with community-acquired urinary tract infection in rural communities of Enugu State, Nigeria
  • Jun 30, 2022
  • GSC Biological and Pharmaceutical Sciences
  • Aneke Christian Chinedu + 3 more

Background: The emergence and spread of extended-spectrum beta-lactamase (ESBL) producing Enterobacteriaceae is now a major challenge in treating urinary tract infections. This study was conducted to determine the Prevalence of ESBL genes in Klebsiella pneumoniae and the influence of these genes on the antimicrobial susceptibility patterns of the isolates, obtained from community acquired urinary tract infection in Enugu state rural communities. Method: A total of 735 clean catch mid-stream urine samples were collected from February, 2021 to June, 2021. The urine samples were cultured and Klebsiella pneumoniae were identified morphologically, biochemically, and then typed down, using PCR, Gel electrophoresis, and Sanger Sequencing by Genewiz. Antibiotic susceptibility testing was done by modified Kirby-Bauer disc diffusion method and interpretation was done following Clinical and Laboratory Standard Institute (CLSI) guidelines. ESBL screening was done by the phenotypic method, using the standard disk diffusion method, whereas the phenotypic confirmation of ESBL producers was done by the double-disk synergy method, and interpreted according to CLSI guidelines. Multiplex PCR was used to detect the genes for SHV and CTX-M while conventional linear PCR was done for TEM and blas GES type ESBL genes. Results: A total of 77 isolates were identified as Klebsiella pneumoniae, and the prevalence of positive ESBL in them were 10(12.9%). Of the 77 isolates that were tested for antibiogram, 29 isolates were multidrug-resistance (MDR). Out of the MDR isolates, 10 were ESBL positive, whereas 19 were not. Of this 29 MDR isolates, 6 were extensively-drug resistant (XDR). Of the 6 XDR isolates, 3 do not possess ESBL enzymes, whereas 3 of them do. Age range of 31-40 contributed the highest prevalence of ESBL genes (60%), whereas age range of 10-20, 21-30, and 51-70 did not produce any ESBL gene. bla TEM gene was the most prevalent ESBL resistant genes with a prevalence of 10 (100%), followed by SHV 9(90%), whereas bla GES gene and bla CTX-M have the least prevalence of 4 (40%) each. Conclusion: Higher prevalence of MDR, XDR, and ESBL-producing Klebsiella pneumoniae were observed, thus the need for public health intervention for effective prevention and control of antimicrobial resistance, and proper treatment of UTIs.

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