Medicine and Health Sciences Commons^™

Trna Anticodon Cleavage By Target-Activated Crispr-Cas13a Effector, Ishita Jain, Matvey Kolesnik, Konstantin Kuznedelov, Leonid Minakhin, Natalia Morozova, Anna Shiriaeva, Alexandr Kirillov, Sofia Medvedeva, Alexei Livenskyi, Laura Kazieva, Kira S Makarova, Eugene V Koonin, Sergei Borukhov, Konstantin Severinov, Ekaterina Semenova

Rowan-Virtua School of Osteopathic Medicine Faculty Scholarship

Type VI CRISPR-Cas systems are among the few CRISPR varieties that target exclusively RNA. The CRISPR RNA–guided, sequence-specific binding of target RNAs, such as phage transcripts, activates the type VI effector, Cas13. Once activated, Cas13 causes collateral RNA cleavage, which induces bacterial cell dormancy, thus protecting the host population from the phage spread. We show here that the principal form of collateral RNA degradation elicited by Leptotrichia shahii Cas13a expressed in Escherichia coli cells is the cleavage of anticodons in a subset of transfer RNAs (tRNAs) with uridine-rich anticodons. This tRNA cleavage is accompanied by inhibition of protein synthesis, thus …

Sequence-Structure-Function Characterization Of The Emerging Tetracycline Destructase Family Of Antibiotic Resistance Enzymes, Kevin S Blake, Hirdesh Kumar, Anisha Loganathan, Emily E Williford, Luke Diorio-Toth, Yao-Peng Xue, Wai Kwan Tang, Tayte P Campbell, David D Chong, Steven Angtuaco, Timothy A Wencewicz, Niraj H Tolia, Gautam Dantas

2020-Current year OA Pubs

Tetracycline destructases (TDases) are flavin monooxygenases which can confer resistance to all generations of tetracycline antibiotics. The recent increase in the number and diversity of reported TDase sequences enables a deep investigation of the TDase sequence-structure-function landscape. Here, we evaluate the sequence determinants of TDase function through two complementary approaches: (1) constructing profile hidden Markov models to predict new TDases, and (2) using multiple sequence alignments to identify conserved positions important to protein function. Using the HMM-based approach we screened 50 high-scoring candidate sequences in Escherichia coli, leading to the discovery of 13 new TDases. The X-ray crystal structures of …

Androgen Exposure Impairs Neutrophil Maturation And Function Within The Infected Kidney, Teri N Hreha, Christina A Collins, Elisabeth B Cole, Rachel J Jin, David A Hunstad

2020-Current year OA Pubs

Urinary tract infections (UTIs) in men are uncommon yet carry an increased risk for severe pyelonephritis and other complications. In models of

Multiple Pathways For Glucose Phosphate Transport And Utilization Support Growth Of Cryptosporidium Parvum, Rui Xu, Wandy L Beatty, Valentin Greigert, William H Witola, L David Sibley

2020-Current year OA Pubs

Cryptosporidium parvum is an obligate intracellular parasite with a highly reduced mitochondrion that lacks the tricarboxylic acid cycle and the ability to generate ATP, making the parasite reliant on glycolysis. Genetic ablation experiments demonstrated that neither of the two putative glucose transporters CpGT1 and CpGT2 were essential for growth. Surprisingly, hexokinase was also dispensable for parasite growth while the downstream enzyme aldolase was required, suggesting the parasite has an alternative way of obtaining phosphorylated hexose. Complementation studies in E. coli support a role for direct transport of glucose-6-phosphate from the host cell by the parasite transporters CpGT1 and CpGT2, thus …

Microbial Co-Occurrences On Catheters From Long-Term Catheterized Patients, Taylor M Nye, Zongsen Zou, Chloe L P Obernuefemann, Jerome S Pinkner, Erin Lowry, Kent Kleinschmidt, Karla Bergeron, Aleksandra Klim, Karen W Dodson, Ana L Flores-Mireles, Jennifer N Walker, Daniel Garrett Wong, Alana Desai, Michael G Caparon, Scott J Hultgren

Journal Articles

Catheter-associated urinary tract infections (CAUTIs), a common cause of healthcare-associated infections, are caused by a diverse array of pathogens that are increasingly becoming antibiotic resistant. We analyze the microbial occurrences in catheter and urine samples from 55 human long-term catheterized patients collected over one year. Although most of these patients were prescribed antibiotics over several collection periods, their catheter samples remain colonized by one or more bacterial species. Examination of a total of 366 catheter and urine samples identify 13 positive and 13 negative genus co-occurrences over 12 collection periods, representing associations that occur more or less frequently than expected …

Microbial Co-Occurrences On Catheters From Long-Term Catheterized Patients, Taylor M Nye, Zongsen Zou, Chloe L P Obernuefemann, Jerome S Pinkner, Erin Lowry, Kent Kleinschmidt, Karla Bergeron, Aleksandra Klim, Karen W Dodson, Ana L Flores-Mireles, Jennifer N Walker, Daniel Garrett Wong, Alana Desai, Michael G Caparon, Scott J Hultgren

2020-Current year OA Pubs

Catheter-associated urinary tract infections (CAUTIs), a common cause of healthcare-associated infections, are caused by a diverse array of pathogens that are increasingly becoming antibiotic resistant. We analyze the microbial occurrences in catheter and urine samples from 55 human long-term catheterized patients collected over one year. Although most of these patients were prescribed antibiotics over several collection periods, their catheter samples remain colonized by one or more bacterial species. Examination of a total of 366 catheter and urine samples identify 13 positive and 13 negative genus co-occurrences over 12 collection periods, representing associations that occur more or less frequently than expected …

Harnessing Antagonistic Pleiotropy: Tolc-Dependent Coliphages Can Drive Reduced Antibiotic Resistance In E. Coli, Cooper Mckenna

CMC Senior Theses

The rise of multidrug-resistant (MDR) bacterial pathogens has been a growing concern in healthcare around the world, and bacteriophage (phage) therapy is a promising method to combat MDR infections. One defense mechanism of E. coli against antibiotics is the TolC-AcrAB efflux pump. At the same time, some phages use TolC as a surface receptor to infect the cell. This puts TolC at a crossroads in which it is beneficial to the bacteria to protect against antibiotics but harmful by allowing phage infection, creating the potential for evolutionary trade-offs. Previous research has identified only three TolC-dependent phages and shown phage-resistant E. …

Fall On Eliquis With Almost Incidental E. Coli Bacteremia: A Case Of Anchoring Bias In Hospital Medicine, Benjamin H. Bridges, Sara O'Neal, Kaleb Freeman

South Atlantic Division GME Research Day 2024

No abstract provided.

A Thermodynamic Analysis Of Clc Transporter Dimerization In Lipid Bilayers, Rahul Chadda, Taeho Lee, Robyn Mahoney-Kruszka, Elizabeth G Kelley, Nathan Bernhardt, Priyanka Sandal, Janice L Robertson

2020-Current year OA Pubs

The CLC-ec1 chloride/proton antiporter is a membrane-embedded homodimer with subunits that can dissociate and associate, but the thermodynamic driving forces favor the assembled dimer at biological densities. Yet, the physical reasons for this stability are confounding as dimerization occurs via the burial of hydrophobic interfaces away from the lipid solvent. For binding of nonpolar surfaces in aqueous solution, the driving force is often attributed to the hydrophobic effect, but this should not apply in the membrane since there is very little water. To investigate this further, we quantified the thermodynamic changes associated with CLC dimerization in membranes by carrying out …

Picobirnaviruses Encode Proteins That Are Functional Bacterial Lysins, Tianyu Gan, David Wang

2020-Current year OA Pubs

Picobirnaviruses (PBVs) are double-stranded RNA viruses frequently detected in human and animal enteric viromes. Associations of PBVs with enteric graft-versus-host disease and type I diabetes during pregnancy have been established. Since their discovery in 1988, PBVs have been generally assumed to be animal-infecting viruses despite the lack of culture system, animal model, or detection in animal cells or tissues. Recent studies have proposed that bacteria or fungi could be the hosts of PBVs based on genomic analysis. Here, we functionally demonstrate that multiple PBVs of different genome organizations encode bacterial lysins that lyse

International Epidemiology Of Carbapenemase-Producing Escherichia Coli, Angelique E Boutzoukas, Lauren Komarow, Liang Chen, Blake Hanson, Souha S Kanj, Zhengyin Liu, Soraya Salcedo Mendoza, Karen Ordoñez, Minggui Wang, David L Paterson, Scott Evans, Lizhao Ge, Abhigya Giri, Carol Hill, Keri Baum, Robert A Bonomo, Barry Kreiswirth, Robin Patel, Cesar A Arias, Henry F Chambers, Vance G Fowler, David Van Duin

Journal Articles

BACKGROUND: Carbapenemase-producing (CP) Escherichia coli (CP-Ec) are a global public health threat. We aimed to describe the clinical and molecular epidemiology and outcomes of patients from several countries with CP-Ec isolates obtained from a prospective cohort.

METHODS: Patients with CP-Ec were enrolled from 26 hospitals in 6 countries. Clinical data were collected, and isolates underwent whole-genome sequencing. Clinical and molecular features and outcomes associated with isolates with or without metallo-β-lactamases (MBLs) were compared. The primary outcome was desirability of outcome ranking (DOOR) at 30 days after the index culture.

RESULTS: Of the 114 CP-Ec isolates in Consortium on resistance against …

Indwelling Catheter Vs Intermittent Catheterization: Is There A Difference In Uti Susceptibility?, Vera Neumeier, Fabian P Stangl, Joëlle Borer, Collene E Anderson, Veronika Birkhäuser, Oksana Chemych, Oliver Gross, Miriam Koschorke, Jonas Marschall, Shawna Mccallin, Ulrich Mehnert, Helen Sadri, Lara Stächele, Thomas M Kessler, Lorenz Leitner

2020-Current year OA Pubs

BACKGROUND: Patients with neurogenic lower urinary tract dysfunction (NLUTD) often rely on some type of catheterization for bladder emptying. Intermittent catheterization (IC) is considered the gold standard and is preferred over continuous catheterization, since it is considered to cause fewer urinary tract infections (UTIs) than indwelling catheterization. The main objective of our study was to describe UTI prevalence (at visit) and incidence (within the last 12 months) and urine culture characteristics between patients using an indwelling catheter versus (vs) those performing IC.

METHODS: In this cross-sectional study, we prospectively evaluated from 02/2020 to 01/2021 patients with NLUTD undergoing urine cultures …

Engineered Reporter Phages For Detection Of Escherichia Coli, Enterococcus, And Klebsiella In Urine, Susanne Meile, Jonas Marschall, Et Al.

2020-Current year OA Pubs

The rapid detection and species-level differentiation of bacterial pathogens facilitates antibiotic stewardship and improves disease management. Here, we develop a rapid bacteriophage-based diagnostic assay to detect the most prevalent pathogens causing urinary tract infections: Escherichia coli, Enterococcus spp., and Klebsiella spp. For each uropathogen, two virulent phages were genetically engineered to express a nanoluciferase reporter gene upon host infection. Using 206 patient urine samples, reporter phage-induced bioluminescence was quantified to identify bacteriuria and the assay was benchmarked against conventional urinalysis. Overall, E. coli, Enterococcus spp., and Klebsiella spp. were each detected with high sensitivity (68%, 78%, 87%), specificity (99%, 99%, …

Safety And Efficacy Of Ceftolozane/Tazobactam Plus Metronidazole Versus Meropenem From A Phase 2, Randomized Clinical Trial In Pediatric Participants With Complicated Intra-Abdominal Infection, Carl-Christian A. Jackson, Jason Newland, Nataliia Dementieva, Julia Lonchar, Feng-Hsiu Su, Jennifer A. Huntington, Mekki Bensaci, Myra W. Popejoy, Matthew G. Johnson, Carisa De Anda, Elizabeth G. Rhee, Christopher J. Bruno

2020-Current year OA Pubs

BACKGROUND: Ceftolozane/tazobactam, a cephalosporin-β-lactamase inhibitor combination, is approved for the treatment of complicated urinary tract infections and complicated intra-abdominal infections (cIAI). The safety and efficacy of ceftolozane/tazobactam in pediatric participants with cIAI were assessed.

METHODS: This phase 2 study (NCT03217136) randomized participants to either ceftolozane/tazobactam+metronidazole or meropenem for treatment of cIAI in pediatric participants (<18 years). The primary objective was to assess the safety and tolerability of intravenous ceftolozane/tazobactam+metronidazole. Clinical cure at end of treatment (EOT) and test of cure (TOC) visits were secondary end points.

RESULTS: The modified intent-to-treat (MITT) population included 91 participants (ceftolozane/tazobactam+metronidazole, n = 70; meropenem, n = 21). Complicated appendicitis was the most common diagnosis (93.4%); Escherichia coli was the most common pathogen (65.9%). Adverse events (AEs) occurred in 80.0% and 61.9% of participants receiving ceftolozane/tazobactam+metronidazole …

Evolutionary And Functional History Of The Escherichia Coli K1 Capsule., Sergio Arredondo-Alonso, George Blundell-Hunter, Zuyi Fu, Rebecca A. Gladstone, Alfred Fillol-Salom, Jessica Loraine, Elaine Cloutman-Green, Pål J. Johnsen, Ørjan Samuelsen, Anna K. Pöntinen, François Cléon, Susana Chavez-Bueno, Miguel A. De La Cruz, Miguel A. Ares, Manivanh Vongsouvath, Agnieszka Chmielarczyk, Carolyne Horner, Nigel Klein, Alan Mcnally, Joice N. Reis, José R. Penadés, Nicholas R. Thomson, Jukka Corander, Peter W. Taylor, Alex J. Mccarthy

Manuscripts, Articles, Book Chapters and Other Papers

Escherichia coli is a leading cause of invasive bacterial infections in humans. Capsule polysaccharide has an important role in bacterial pathogenesis, and the K1 capsule has been firmly established as one of the most potent capsule types in E. coli through its association with severe infections. However, little is known about its distribution, evolution and functions across the E. coli phylogeny, which is fundamental to elucidating its role in the expansion of successful lineages. Using systematic surveys of invasive E. coli isolates, we show that the K1-cps locus is present in a quarter of bloodstream infection isolates and has emerged …

Evaluation Of The Ng-Test Carba 5 Lateral Flow Assay With An Imp-2-Producing Morganella Morganii And Other Morganellaceae, Nicole J. Tarlton, Meghan A. Wallace, Robert F. Potter, Kailun Zhang, Gautam Dantas, Erik R. Dubberke, Carey-Ann D. Burnham, Melanie L. Yarbrough

2020-Current year OA Pubs

An isolate of Morganella morganii (MMOR1) that tested susceptible to 3

Urinary Tract Infections Trigger Synucleinopathy Via The Innate Immune Response, Wouter Peelaerts, Scott J Hultgren, Tom J Hannan, Et Al.

2020-Current year OA Pubs

Symptoms in the urogenital organs are common in multiple system atrophy (MSA), also in the years preceding the MSA diagnosis. It is unknown how MSA is triggered and these observations in prodromal MSA led us to hypothesize that synucleinopathy could be triggered by infection of the genitourinary tract causing ɑ-synuclein (ɑSyn) to aggregate in peripheral nerves innervating these organs. As a first proof that peripheral infections could act as a trigger in MSA, this study focused on lower urinary tract infections (UTIs), given the relevance and high frequency of UTIs in prodromal MSA, although other types of infection might also …

Case Of Shiga-Toxin Producing E. Coli Dysentery In Adult Patient In The Absence Of Diarrhea, Diana Roy

North Texas GME Research Forum 2023

This is a unique case of a 38 year old Caucasian female with no significant medical history who presented to the hospital with complaint of 3 days of abdominal pain, nausea/vomiting, dark red formed stool, and fever (TMax 102F), as well as dizziness, body aches and throat pain. She reported eating meatloaf with her daughter two days before symptom onset, and daughter was reported to be ill as well. Upon initial exam, patient was found to have temp 100F, was hypotensive and tachycardic with lactate of 4.2. FOBT was positive. Significant lab values include creatinine 3.39 (baseline normal), hemoglobin of …

The F-Pilus Biomechanical Adaptability Accelerates Conjugative Dissemination Of Antimicrobial Resistance And Biofilm Formation, Jonasz B Patkowski, Tobias Dahlberg, Himani Amin, Dharmender K Gahlot, Sukhithasri Vijayrajratnam, Joseph P Vogel, Matthew S Francis, Joseph L Baker, Magnus Andersson, Tiago R D Costa

2020-Current year OA Pubs

Conjugation is used by bacteria to propagate antimicrobial resistance (AMR) in the environment. Central to this process are widespread conjugative F-pili that establish the connection between donor and recipient cells, thereby facilitating the spread of IncF plasmids among enteropathogenic bacteria. Here, we show that the F-pilus is highly flexible but robust at the same time, properties that increase its resistance to thermochemical and mechanical stresses. By a combination of biophysical and molecular dynamics methods, we establish that the presence of phosphatidylglycerol molecules in the F-pilus contributes to the structural stability of the polymer. Moreover, this structural stability is important for …

Rapid Profiling Of Dna Replication Dynamics Using Mass Spectrometry-Based Analysis Of Nascent Dna, Mohamed E Ashour, Andrea K Byrum, Alice Meroni, Jun Xia, Saurabh Singh, Roberto Galletto, Susan M Rosenberg, Alessandro Vindigni, Nima Mosammaparast

2020-Current year OA Pubs

The primary method for probing DNA replication dynamics is DNA fiber analysis, which utilizes thymidine analog incorporation into nascent DNA, followed by immunofluorescent microscopy of DNA fibers. Besides being time-consuming and prone to experimenter bias, it is not suitable for studying DNA replication dynamics in mitochondria or bacteria, nor is it adaptable for higher-throughput analysis. Here, we present mass spectrometry-based analysis of nascent DNA (MS-BAND) as a rapid, unbiased, quantitative alternative to DNA fiber analysis. In this method, incorporation of thymidine analogs is quantified from DNA using triple quadrupole tandem mass spectrometry. MS-BAND accurately detects DNA replication alterations in both …

Renovating A Double Fence With Or Without Notifying The Next Door And Across The Street Neighbors: Why The Biogenic Cytoplasmic Membrane Of Gram-Negative Bacteria Display Asymmetry?, Mikhail Bogdanov

Journal Articles

The complex two-membrane organization of the envelope of Gram-negative bacteria imposes an unique biosynthetic and topological constraints that can affect translocation of lipids and proteins synthesized on the cytoplasm facing leaflet of the cytoplasmic (inner) membrane (IM), across the IM and between the IM and outer membrane (OM). Balanced growth of two membranes and continuous loss of phospholipids in the periplasmic leaflet of the IM as metabolic precursors for envelope components and for translocation to the OM requires a constant supply of phospholipids in the IM cytosolic leaflet. At present we have no explanation as to why the biogenic E. …

Allosteric Effects Of E. Coli Ssb And Recr Proteins On Reco Protein Binding To Dna, Min Kyung Shinn, Sumit K Chaturvedi, Alexander G Kozlov, Timothy M Lohman

2020-Current year OA Pubs

Escherichia coli single stranded (ss) DNA binding protein (SSB) plays essential roles in DNA maintenance. It binds ssDNA with high affinity through its N-terminal DNA binding core and recruits at least 17 different SSB interacting proteins (SIPs) that are involved in DNA replication, recombination, and repair via its nine amino acid acidic tip (SSB-Ct). E. coli RecO, a SIP, is an essential recombination mediator protein in the RecF pathway of DNA repair that binds ssDNA and forms a complex with E. coli RecR protein. Here, we report ssDNA binding studies of RecO and the effects of a 15 amino acid …

Emphysematous Pyelonephritis Necessitating Bilateral Radical Nephrectomy: A Case Report And Literature Review., Christine E Wamsley, Arianna Morton, Christopher G Roth, Joseph K Izes, Li Li

Computational Medicine Center Faculty Papers

Emphysematous pyelonephritis (EPN) is a severe, acute necrotizing infection of the kidney with gas accumulation in the renal parenchyma, collecting ducts, and/or perirenal tissue. We report a case of EPN in a 66 year-old male with uncontrolled diabetes mellitus (DM), urinary tract infection and septic shock necessitating emergent bilateral radical nephrectomy. Morphologically, the kidney parenchyma revealed severe acute bacterial pyelonephritis with extensive abscesses, gas cysts, necrosis and foci of infarctions. The uninvolved background cortex parenchyma exhibited diabetic nephropathy (DN), Class IIB. Post-operatively, the patient remained dialysis-dependent with multiple re-admissions for recurrent multi-drug resistant

Role Of Ribosome Recycling Factor In Natural Termination And Translational Coupling As A Ribosome Releasing Factor, Yoshio Inokuchi, Fabio Quaglia, Akikazu Hirashima, Yoshihiro Yamamoto, Hideko Kaji, Akira Kaji

Department of Biochemistry and Molecular Biology Faculty Papers

The role of ribosome recycling factor (RRF) of E. coli was studied in vivo and in vitro. We used the translational coupling without the Shine-Dalgarno sequence of downstream ORF (d-ORF) as a model system of the RRF action in natural termination of protein synthesis. For the in vivo studies we used the translational coupling by the adjacent coat and lysis genes of RNA phage GA sharing the termination and initiation (UAAUG) and temperature sensitive RRF. The d-ORF translation was measured by the expression of the reporter lacZ gene connected to the 5'-terminal part of the lysis gene. The results showed …

E. Coli Catheter-Associated Urinary Tract Infections Are Associated With Distinctive Virulence And Biofilm Gene Determinants, Zongsen Zou, Robert F. Potter, William H. Mccoy, John A. Wildenthal, George L. Katumba, Peter J. Mucha, Gautam Dantas, Jeffrey P. Henderson

2020-Current year OA Pubs

Urinary catheterization facilitates urinary tract colonization by E. coli and increases infection risk. Here, we aimed to identify strain-specific characteristics associated with the transition from colonization to infection in catheterized patients. In a single-site study population, we compared E. coli isolates from patients with catheter-associated asymptomatic bacteriuria (CAASB) to those with catheter-associated urinary tract infection (CAUTI). CAUTI isolates were dominated by a phylotype B2 subclade containing the multidrug-resistant ST131 lineage relative to CAASB isolates, which were phylogenetically more diverse. A distinctive combination of virulence-associated genes was present in the CAUTI-associated B2 subclade. Catheter-associated biofilm formation was widespread among isolates and …

Discovery And Characterization Of A New Class Of O-Linking Oligosaccharyltransferases From The Moraxellaceae Family, Cory J Knoot, Paeton L Wantuch, Lloyd S Robinson, David A Rosen, Nichollas E Scott, Christian M Harding

2020-Current year OA Pubs

Bacterial protein glycosylation is commonly mediated by oligosaccharyltransferases (OTases) that transfer oligosaccharides en bloc from preassembled lipid-linked precursors to acceptor proteins. Natively, O-linking OTases usually transfer a single repeat unit of the O-antigen or capsular polysaccharide to the side chains of serine or threonine on acceptor proteins. Three major families of bacterial O-linking OTases have been described: PglL, PglS, and TfpO. TfpO is limited to transferring short oligosaccharides both in its native context and when heterologously expressed in glycoengineered Escherichia coli. On the other hand, PglL and PglS can transfer long-chain polysaccharides when expressed in glycoengineered E. coli. Herein, we …

Antibacterial And Antifungal Activity Of Methanolic Extracts Of Salix Alba L. Against Various Disease Causing Pathogens, Bilal Javed, F. Farooq, M. Ibrahim, H.A.B. Abbas, H. Jawwad, S.S. Zehra, H.M. Ahmad, A. Sarwar, K. Malik, K. Nawaz

Articles

The present study was aimed to manifest the antibacterial and antifungal activity of methanolic extracts of Salix alba L. against seven Gram-positive and Gram-negative bacterial pathogens e.g. Streptococcus pyogenes, Staphylococcus aureus (1), S. aureus (2), Shigella sonnei, Escherichia coli (1), E. coli (2) and Neisseria gonorrhoeae and three fungal isolates from the air such as Aspergillus terreus, A. ornatus, and Rhizopus stolonifer. Two different serotypes of S. aureus and E. coli were used. The agar well-diffusion method results showed the dose-dependent response of plant extracts against bacterial and fungal strains while some organisms were found resistant e.g. E. coli (1), …

Occurrence Of High-Risk Clonal Lineages St58, St69, St224, And St410 Among Extended-Spectrum-Lactamase-Producing Escherichia Coli Isolated From Healthy Free-Range Chickens (Gallus Gallus Domesticus) In A Rural Region In Tunisia, Saloua Benlabidi, Anis Raddaoui, Sana Lengliz, Sarah Cheriet, Paul Hynds, Wafa Achour, Taoufik Ghrairi, Mohamed Salah Abbassi Salah Abbassi

Articles

Antimicrobial-resistant Escherichia coli isolates have emerged in various ecologic compartments and evolved to spread globally. We sought to (1.) investigate the occurrence of ESBL-producing E. coli (ESBL-Ec) in feces from free-range chickens in a rural region and (2.) characterize the genetic background of antimicrobial resistance and the genetic relatedness of collected isolates. Ninety-five feces swabs from free-range chickens associated with two households (House 1/House 2) in a rural region in northern Tunisia were collected. Samples were screened to recover ESBL-Ec, and collected isolates were characterized for phenotype/genotype of antimicrobial resistance, integrons, and molecular typing (pulsed-field gel electrophoresis (PFGE) and multilocus …

Assessing Antimicrobial And Metal Resistance Genes In Escherichia Coli From Domestic Groundwater Supplies In Rural Ireland, Luisa Andrade

Articles

Natural ecosystems can become significant reservoirs and/or pathways for antimicrobial resistance (AMR) dissemination, with the potential to affect nearby microbiological, animal, and ultimately human communities. This is further accentuated in environments that provide direct human exposure, such as drinking water. To date, however, few studies have investigated AMR dissemination potential and the presence of co-selective stressors (e. g., metals/metalloids) in groundwater environments of human health significance. Accordingly, the present study analysed samples from rural (drinking) groundwater supplies (i.e., private wells) in the Republic of Ireland, where land use is dominated by livestock grazing activities. In total, 48 Escherichia coli isolates …

Interactions Of Pathogenic Escherichia Coli With Ceacams, Alaullah Sheikh, James M Fleckenstein

2020-Current year OA Pubs

The pathogenic