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https://www.readbyqxmd.com/read/28542913/reduction-of-escherichia-coli-o157-h7-in-biofilms-using-bacteriophage-bpeco-19
#1
Mohammad Sadekuzzaman, Sungdae Yang, Md Furkanur Rahaman Mizan, Sang-Do Ha
Biofilm formation is a growing concern in the food industry. Escherichia coli O157:H7 is one of the most important foodborne pathogens that can persists in food and food-related environments and subsequently produce biofilms. The efficacy of bacteriophage BPECO 19 was evaluated against three E. coli O157:H7 strains in biofilms. Biofilms of the three E. coli O157:H7 strains were grown on abiotic (stainless steel, rubber, and minimum biofilm eradication concentration [MBEC(TM) ] device) and biotic (lettuce) surfaces at different temperatures...
May 19, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28542593/lack-of-the-pga-exopolysaccharide-in-salmonella-as-an-adaptive-trait-for-survival-in-the-host
#2
Maite Echeverz, Begoña García, Amaia Sabalza, Jaione Valle, Toni Gabaldón, Cristina Solano, Iñigo Lasa
Many bacteria build biofilm matrices using a conserved exopolysaccharide named PGA or PNAG (poly-β-1,6-N-acetyl-D-glucosamine). Interestingly, while E. coli and other members of the family Enterobacteriaceae encode the pgaABCD operon responsible for PGA synthesis, Salmonella lacks it. The evolutionary force driving this difference remains to be determined. Here, we report that Salmonella lost the pgaABCD operon after the divergence of Salmonella and Citrobacter clades, and previous to the diversification of the currently sequenced Salmonella strains...
May 24, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28542503/biofilm-microenvironment-induces-a-widespread-adaptive-amino-acid-fermentation-pathway-conferring-strong-fitness-advantage-in-escherichia-coli
#3
Sylvie Létoffé, Sabina Chalabaev, José Dugay, Franziska Stressmann, Bianca Audrain, Jean-Charles Portais, Fabien Letisse, Jean-Marc Ghigo
Bacterial metabolism has been studied primarily in liquid cultures, and exploration of other natural growth conditions may reveal new aspects of bacterial biology. Here, we investigate metabolic changes occurring when Escherichia coli grows as surface-attached biofilms, a common but still poorly characterized bacterial lifestyle. We show that E. coli adapts to hypoxic conditions prevailing within biofilms by reducing the amino acid threonine into 1-propanol, an important industrial commodity not known to be naturally produced by Enterobacteriaceae...
May 19, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28526271/an-in-vitro-urinary-catheterization-model-that-approximates-clinical-conditions-for-evaluation-of-innovations-to-prevent-catheter-associated-urinary-tract-infections
#4
R Y R Chua, K Lim, S S J Leong, P A Tambyah, B Ho
BACKGROUND: Catheter associated urinary tract infections (CAUTI) account for about 25% of nosocomial infections globally and often result in increased morbidity and healthcare costs. An added concern is the presence of microbial biofilms which are major reservoirs of bacteria, especially antibiotic resistant bacteria, in catheters. Since the practice of the closed drainage system, innovations to combat CAUTI have not produced significant improvements in clinical outcomes. The lack of a robust laboratory platform to test new CAUTI preventive strategies may impede development of novel technologies...
May 16, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/28505288/effect-of-different-antibiotics-on-biofilm-produced-by-uropathogenic-escherichia-coli-isolated-from-children-with-urinary-tract-infection
#5
María José González, Luciana Robino, Victoria Iribarnegaray, Pablo Zunino, Paola Scavone
Recurrent urinary tract infections (UTI) occur frequently in children and women. Intracellular bacterial communities (IBC) and biofilm formation by Escherichia coli are risk factors for recurrence. The aim of the present study was to evaluate the effect of different antibiotics on biofilms by E. coli strains isolated from children with UTI and to correlate virulence factors and IBC with biofilm formation. 116 E. coli strains were tested for biofilm formation using the crystal violet microplate technique. 58...
May 12, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28494209/antibiotic-resistance-virulence-factors-and-biofilm-formation-ability-in-escherichia-coli-strains-isolated-from-chicken-meat-and-wildlife-in-the-czech-republic
#6
Silvie Pavlickova, Anja Klancnik, Magda Dolezalova, Sonja Smole Mozina, Ivan Holko
Attachment of pathogenic bacteria to food contact surfaces and the subsequent biofilm formation represent a serious threat for the food industry, since these bacteria are more resistant to antimicrobials or possess more virulence factors. The main aim of this study was to investigate the correlation between antibiotic resistance against 13 antibiotics, distribution of 10 virulence factors and biofilm formation in 105 Escherichia coli strains according to their origin. The high prevalence of antibiotic resistance that we have found in wildlife isolates could be acquired by horizontal transfer of resistance genes from human or domestic or farm animals...
May 11, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/28458663/h-ns-mutation-mediated-crispr-cas-activation-inhibits-phage-release-and-toxin-production-of-escherichia-coli-stx2-phage-lysogen
#7
Qiang Fu, Shiyu Li, Zhaofei Wang, Wenya Shan, Jingjiao Ma, Yuqiang Cheng, Hengan Wang, Yaxian Yan, Jianhe Sun
Shiga toxin-converting bacteriophages (Stx phages) carry the stx gene and convert nonpathogenic bacterial strains into Shiga toxin-producing bacteria. There is limited understanding of the effect that an Escherichia coli (E. coli) clustered regularly interspaced short palindromic repeats (CRISPR)-Cas adaptive immune system has on Stx phage lysogen. We investigated heat-stable nucleoid-structuring (H-NS) mutation-mediated CRISPR-Cas activation and its effect on E. coli Stx2 phage lysogen. The Δhns mutant (MG1655Δhns) of the E...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28439262/turn-up-the-heat-food-and-clinical-escherichia-coli-isolates-feature-two-transferrable-loci-of-heat-resistance
#8
Erik J Boll, Roger Marti, Henrik Hasman, Søren Overballe-Petersen, Marc Stegger, Kim Ng, Susanne Knøchel, Karen A Krogfelt, Joerg Hummerjohann, Carsten Struve
Heat treatment is a widely used process to reduce bacterial loads in the food industry or to decontaminate surfaces, e.g., in hospital settings. However, there are situations where lower temperatures must be employed, for instance in case of food production such as raw milk cheese or for decontamination of medical devices such as thermo-labile flexible endoscopes. A recently identified locus of heat resistance (LHR) has been shown to be present in and confer heat resistance to a variety of Enterobacteriaceae, including Escherichia coli isolates from food production settings and clinical ESBL-producing E...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28416858/study-on-e-coli-and-salmonella-biofilms-from-fresh-fruits-and-vegetables
#9
Balagopal Amrutha, Kothandapani Sundar, Prathapkumar Halady Shetty
Foodborne outbreaks associated with fresh fruits and vegetables are on the rise worldwide. Biofilm formation is one of the important traits of pathogens making them strongly attached to substrates as well as express virulence phenotypes. Present study investigates the biofilm forming ability of E. coli and Salmonella sp. isolated from fresh fruits and vegetables. A total of 53 strains, including 35 E. coli and 18 Salmonella sp. isolated from different fruit and vegetable samples were taken into account for the study...
April 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28412552/copper-containing-mesoporous-bioactive-glass-nanoparticles-as-multifunctional-agent-for-bone-regeneration
#10
Alessandra Bari, Nora Bloise, Sonia Fiorilli, Giorgia Novajra, Maria Vallet-Regí, Giovanna Bruni, Almudena Torres-Pardo, José M González-Calbet, Livia Visai, Chiara Vitale-Brovarone
The application of mesoporous bioactive glasses (MBGs) containing controllable amount of different ions, with the aim to impart antibacterial activity, as well as stimulation of osteogenesis and angiogenesis, is attracting an increasing interest. In this contribution, in order to endow nano-sized MBG with additional biological functions, the framework of a binary SiO2-CaO mesoporous glass was modified with different concentrations of copper ions (2 and 5%mol.), through a one-pot ultrasound-assisted sol-gel procedure...
April 12, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28410367/nitric-oxide-charged-catheters-as-a-potential-strategy-for-prevention-of-hospital-acquired-infections
#11
David Margel, Mark Mizrahi, Gili Regev-Shoshani, Mary Ko, Maya Moshe, Rachel Ozalvo, Liat Shavit-Grievink, Jack Baniel, Daniel Kedar, Ofer Yossepowitch, David Lifshitz, Andrei Nadu, David Greenberg, Yossef Av-Gay
BACKGROUND: Catheter-Associated Hospital-Acquired Infections (HAI's) are caused by biofilm-forming bacteria. Using a novel approach, we generated anti-infective barrier on catheters by charging them with Nitric Oxide (NO), a naturally-produced gas molecule. NO is slowly released from the catheter upon contact with physiological fluids, and prevents bacterial colonization and biofilm formation onto catheter surfaces. AIMS AND METHODS: The aim of the study was to assess the anti-infective properties of NO-charged catheters exposed to low concentration (up to 103 CFU/ml) of microbial cells in-vitro...
2017: PloS One
https://www.readbyqxmd.com/read/28389540/acid-evolution-deletes-amino-acid-decarboxylases-and-reregulates-catabolism-of-escherichia-coli-k-12
#12
Amanda He, Stephanie R Penix, Preston J Basting, Jessie M Griffith, Kaitlin E Creamer, Dominic Camperchioli, Michelle W Clark, Alexandra S Gonzales, Jorge Sebastian Chavez Erazo, Nadja S George, Arvind A Bhagwat, Joan L Slonczewski
Acid-adapted strains of Escherichia coli K-12 W3110 were obtained by serial culture in media buffered at pH 4.6 (Harden et al. 2015). Revised genomic analysis of these strains revealed insertion sequence (IS)-driven insertions and deletions that knocked out regulators CadC (acid induction of lysine decarboxylase), GadX (acid induction of glutamate decarboxylase), and FNR (anaerobic regulator). Each acid-evolved strain showed loss of one or more amino acid decarboxylase systems, which normally help neutralize external acid (pH 5 to 6) and increase survival in extreme acid (pH 2)...
April 7, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28367029/biofilm-colonization-in-chronic-treatment-refractory-infections-presenting-with-discharging-sinuses-a-study-in-a-tertiary-care-hospital-of-eastern-india
#13
Asmita De, Hirak Jyoti Raj, Jayeeta Haldar, Poulami Mukherjee, Prasanta Kumar Maiti
INTRODUCTION: Treatment refractory chronic recurrent infections mean those chronic infections which recur by same causal agents with similar drug responsiveness after apparent relief following full course of recommended antimicrobial management. MATERIALS AND METHODS: Fifty different samples were collected from patients with chronic surgical site infections, laparoscopic port site infections, anal fistula, mesh hernioplasty, chronic dacryocystitis, chronic osteomyelitis, and chronic burn wounds...
April 2017: Journal of Laboratory Physicians
https://www.readbyqxmd.com/read/28333234/horizontal-transfer-of-the-blandm-1-gene-to-pseudomonas-aeruginosa-and-acinetobacter-baumannii-in-biofilms
#14
Windy D Tanner, Robyn M Atkinson, Ramesh K Goel, Mark A Toleman, Lowell Scott Benson, Christina A Porucznik, James A VanDerslice
Horizontal gene transfer has contributed to the global spread of the blaNDM-1 gene. Multiple studies have demonstrated plasmid transfer of blaNDM-1 between Gram-negative bacteria, primarily Enterobacteriaceae species, but conjugational transfer of natural blaNDM-1 plasmids from Enterobacteriaceae into Pseudomonas aeruginosa and Acinetobacter baumannii has not previously been shown. As P. aeruginosa and A. baumannii are both typically strong biofilm-formers, transfer of natural blaNDM-1 plasmids could potentially occur more readily in this environment...
February 25, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28299769/the-effect-of-urinary-catheters-on-microbial-biofilms-and-catheter-associated-urinary-tract-infections
#15
Sahra Kirmusaoglu, Seyhun Yurdugül, Ahmet Metin, Suphi Vehid
PURPOSE: The aims of this study were to determine relationship between biofilm producer microorganisms attached to urinary catheters (UCs) and urinary catheter-associated urinary tract infections (CAUTIs), to determine the rate of CAUTI development and the relationship between CAUTI and catheterization period in catheterized patients. MATERIALS AND METHODS: Urinary catheters from 143 inpatients who were hospitalized in Abant Izzet Baysal University Hospital Urinary Service, and urine samples of these patients before and after catheterization of urinarycatheter were collected...
March 16, 2017: Urology Journal
https://www.readbyqxmd.com/read/28197135/cloning-and-characterization-of-the-autoinducer-synthase-gene-from-lipid-degrading-bacterium-cedecea-neteri
#16
Kian-Hin Tan, Kah-Yan How, Jia-Yi Tan, Wai-Fong Yin, Kok-Gan Chan
The process of intercellular communication among bacteria, termed quorum sensing (QS), is mediated by small diffusible molecules known as the autoinducers. QS allows the population to react to the change of cell density in unison, in processes such as biofilm formation, plasmid conjugation, virulence, motility and root nodulation. In Gram-negative proteobacteria, N-acyl homoserine lactone (AHL) is the common "language" to coordinate gene expression. This signaling molecule is usually synthesized by LuxI-type proteins...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28169510/differences-in-internalization-and-growth-of-escherichia-coli-o157-h7-within-the-apoplast-of-edible-plants-spinach-and-lettuce-compared-with-the-model-species-nicotiana-benthamiana
#17
Kathryn M Wright, Louise Crozier, Jacqueline Marshall, Bernhard Merget, Ashleigh Holmes, Nicola J Holden
Internalization of food-borne bacteria into edible parts of fresh produce plants represents a serious health risk. Therefore, internalization of verocytotoxigenic E. coli O157:H7 isolate Sakai was assessed in two species associated with outbreaks, spinach (Spinacia oleracea) and lettuce (Lactuca sativa) and compared to the model species Nicotiana benthamiana. Internalization occurred in the leaves and roots of spinach and lettuce throughout a 10 day time-course. The plant species, tissue type and inoculum dose all impacted the outcome...
May 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28122589/escherichia-coli-o78-isolated-from-septicemic-lambs-shows-high-pathogenicity-in-a-zebrafish-model
#18
Cecilie K Kjelstrup, Amelia E Barber, J Paul Norton, Matthew A Mulvey, Trine M L'Abée-Lund
The pathogenicity of Escherichia coli O78 strain K46, originally isolated from an outbreak of septicemia in neonatal lambs, was investigated in zebrafish embryo and murine models of infection. Its biofilm potential, cellulose production, and the expression of type 1 pili and curli fimbriae were measured by in vitro assays. The strain was highly pathogenic in the zebrafish embryo model of infection, where it killed all embryos within 24 h post inoculation (hpi) at doses as low as 1000 colony forming units. Zebrafish embryos inoculated with similar doses of commensal E...
January 25, 2017: Veterinary Research
https://www.readbyqxmd.com/read/28081347/virulence-factors-biofilm-forming-ability-and-antimicrobial-resistance-of-urinary-escherichia-coli-strains-isolated-from-hospitalized-patients
#19
Barbara Kot, Jolanta Wicha, Agata Grużewska, Małgorzata Piechota, Katarzyna Wolska, Maria Obrębska
BACKGROUND/AIM: Escherichia coli is the most frequent cause of urinary tract infections. We investigated the possible associations between the origin of strains, antimicrobial resistance, the presence of urovirulence factors, and biofilm-forming ability. MATERIALS AND METHODS: Antibiotic susceptibility of E. coli strains was tested by disk diffusion method. Hemagglutination assays were performed for phenotypic characterization of the cell surface. Multiplex PCR was used for detection of virulence genes and for determination of phylogenetic relationships...
December 20, 2016: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/28073397/identification-of-new-members-of-the-escherichia-coli-k-12-mg1655-slya-regulon
#20
Thomas Curran, Fatima Abacha, Stephen Hibberd, Matthew Rolfe, Melissa Lacey, Jeffrey Green
SlyA is a member of the MarR family of bacterial transcriptional regulators. Previously, SlyA has been shown to directly regulate only two operons in Escherichia coli K-12 MG1655, fimB and hlyE (clyA). In both cases SlyA activates gene expression by antagonizing repression by the nucleoid associated protein H-NS. Here the transcript profiles of aerobic glucose-limited steady-state chemostat cultures of E. coli K-12 MG1655, slyA mutant and slyA over-expression strains are reported. The transcript profile of the slyA mutant was not significantly different to that of the parent; however, that of the slyA expression strain was significantly different from that of the vector control...
January 10, 2017: Microbiology
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