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Antibiotics for escherichia coli

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https://www.readbyqxmd.com/read/28812723/the-unconstrained-evolution-of-fast-and-efficient-antibiotic-resistant-bacterial-genomes
#1
Carlos Reding-Roman, Mark Hewlett, Sarah Duxbury, Fabio Gori, Ivana Gudelj, Robert Beardmore
Evolutionary trajectories are constrained by trade-offs when mutations that benefit one life history trait incur fitness costs in other traits. As resistance to tetracycline antibiotics by increased efflux can be associated with an increase in length of the Escherichia coli chromosome of 10% or more, we sought costs of resistance associated with doxycycline. However, it was difficult to identify any because the growth rate (r), carrying capacity (K) and drug efflux rate of E. coli increased during evolutionary experiments where the species was exposed to doxycycline...
January 30, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812563/multicopy-plasmids-potentiate-the-evolution-of-antibiotic-resistance-in-bacteria
#2
Alvaro San Millan, Jose Antonio Escudero, Danna R Gifford, Didier Mazel, R Craig MacLean
Plasmids are thought to play a key role in bacterial evolution by acting as vehicles for horizontal gene transfer, but the role of plasmids as catalysts of gene evolution remains unexplored. We challenged populations of Escherichia coli carrying the blaTEM-1 β-lactamase gene on either the chromosome or a multicopy plasmid (19 copies per cell) with increasing concentrations of ceftazidime. The plasmid accelerated resistance evolution by increasing the rate of appearance of novel TEM-1 mutations, thereby conferring resistance to ceftazidime, and then by amplifying the effect of TEM-1 mutations due to the increased gene dosage...
November 7, 2016: Nature ecology & evolution
https://www.readbyqxmd.com/read/28811343/comparative-genomics-of-escherichia-coli-isolated-from-skin-and-soft-tissue-and-other-extraintestinal-infections
#3
Amit Ranjan, Sabiha Shaik, Nishant Nandanwar, Arif Hussain, Sumeet K Tiwari, Torsten Semmler, Savita Jadhav, Lothar H Wieler, Munirul Alam, Rita R Colwell, Niyaz Ahmed
Escherichia coli, an intestinal Gram-negative bacterium, has been shown to be associated with a variety of diseases in addition to intestinal infections, such as urinary tract infections (UTIs), meningitis in neonates, septicemia, skin and soft tissue infections (SSTIs), and colisepticemia. Thus, for nonintestinal infections, it is categorized as extraintestinal pathogenic E. coli (ExPEC). It is also an opportunistic pathogen, causing cross infections, notably as an agent of zoonotic diseases. However, comparative genomic data providing functional and genetic coordinates for ExPEC strains associated with these different types of infections have not proven conclusive...
August 15, 2017: MBio
https://www.readbyqxmd.com/read/28810864/molecular-determination-of-antimicrobial-resistance-in-escherichia-coli-isolated-from-raw-meat-in-addis-ababa-and-bishoftu-ethiopia
#4
Yohannes Equar Messele, Reta Duguma Abdi, Shimels Tikuye Yalew, Desiye Tesfaye Tegegne, Bezina Arega Emeru, Gebremeskel Mamu Werid
BACKGROUND: Consumption of meat contaminated by E. coli causes a serious illness and even death to affected individuals. Recently the emerging of antibiotic resistant foodborne E. coli poses serious public health risks worldwide. However, little is known about the antibiotic resistance profile of E. coli in Ethiopia. This study aimed to determine the prevalence and Antimicrobial resistance (AMR) status of E. coli isolated from different type of meat. METHODS: Overall 292 samples were collected from December 2015 to April 2016 from slaughterhouses to determine the prevalence and AMR of E...
August 15, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28810737/identification-of-the-colicin-v-bacteriocin-gene-cluster-by-functional-screening-of-a-human-microbiome-metagenomic-library
#5
Louis Cohen, Sun Han, Yun-Han Huang, Sean F Brady
The forces that shape human microbial ecology are complex. It is likely, that human microbiota, similarly to other microbiomes, use antibiotics as one way to establish an ecological niche. In this study, we use functional metagenomics to identify human microbial gene clusters that encode for antibiotic functions. Screening of a metagenomic library prepared from a healthy patient stool sample led to the identification of a family of clones with inserts that are 99% identical to a region of a virulence plasmid found in avian pathogenic Escherichia coli...
August 15, 2017: ACS Infectious Diseases
https://www.readbyqxmd.com/read/28810248/antibiotic-susceptibility-and-molecular-characterization-of-escherichia-coli-o157-isolates-from-urinary-tract-infections
#6
Zonglan Xie, Ziqiang Dong, Ping Zhu, Lusheng Zhang, Xiaobo Chen, Chuanjiang Dong
BACKGROUND: Escherichia coli O157 is an important food-borne pathogen that can cause diarrhoea, hemorrhagic colitis, and hemolytic uraemic syndrome. Enterobacterial repetitive intergenic consensus sequence PCR (ERIC-PCR) and multilocus sequence typing (MLST) are good methods for molecular typing and the extensive use of antibiotics is a contributing factor to the increasing incidence of antimicrobial-resistant for these strains. OBJECTIVES: The aim of this study was to determine the prevalence, antimicrobial resistance, and genetic diversity of E...
August 16, 2017: Urologia Internationalis
https://www.readbyqxmd.com/read/28810229/photodegradation-of-sulfathiazole-under-simulated-sunlight-kinetics-photo-induced-structural-rearrangement-and-antimicrobial-activities-of-photoproducts
#7
Xi-Zhi Niu, Julie Glady-Croué, Jean-Philippe Croué
Photolysis is a core natural process impacting the fate of some sulfonamide antibiotics in sunlit waters. In this study, sunlight-induced phototransformation of sulfathiazole was investigated. A photolytic quantum yield of 0.079 was obtained in buffered water (pH = 8.0). Different natural organic matter isolates inhibited the photolysis of sulfathiazole by light screening effect. A kinetic model was developed to predict the photodegradation rate of sulfathiazole using the light screening correction factor of the water matrix in the wavelength range of 300-350 nm...
August 9, 2017: Water Research
https://www.readbyqxmd.com/read/28808348/rapid-phenotypic-stress-based-microfluidic-antibiotic-susceptibility-testing-of-gram-negative-clinical-isolates
#8
Maxim Kalashnikov, Marc Mueller, Christine McBeth, Jean C Lee, Jennifer Campbell, Andre Sharon, Alexis F Sauer-Budge
Bacteremia is a life-threatening condition for which antibiotics must be prescribed within hours of clinical diagnosis. Since the current gold standard for bacteremia diagnosis is based on conventional methods developed in the mid-1800s-growth on agar or in broth-identification and susceptibility profiling for both Gram-positive and Gram-negative bacterial species requires at least 48-72 h. Recent advancements in accelerated phenotypic antibiotic susceptibility testing have centered on the microscopic growth analysis of small bacterial populations...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28808005/conformational-dynamics-of-1-deoxy-d-xylulose-5-phosphate-synthase-on-ligand-binding-revealed-by-h-d-exchange-ms
#9
Jieyu Zhou, Luying Yang, Alicia DeColli, Caren Freel Meyers, Natalia S Nemeria, Frank Jordan
The enzyme 1-deoxy-d-xylulose 5-phosphate synthase (DXPS) is a key enzyme in the methylerythritol 4-phosphate pathway and is a target for the development of antibiotics, herbicides, and antimalarial drugs. DXPS catalyzes the formation of 1-deoxy-d-xylulose 5-phosphate (DXP), a branch point metabolite in isoprenoid biosynthesis, and is also used in the biosynthesis of thiamin (vitamin B1) and pyridoxal (vitamin B6). Previously, we found that DXPS is unique among the superfamily of thiamin diphosphate (ThDP)-dependent enzymes in stabilizing the predecarboxylation intermediate, C2-alpha-lactyl-thiamin diphosphate (LThDP), which has subsequent decarboxylation that is triggered by d-glyceraldehyde 3-phosphate (GAP)...
August 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28807840/the-heterologous-expression-strategies-of-antimicrobial-peptides-in-microbial-systems
#10
REVIEW
Ting Deng, Haoran Ge, Huahua He, Yao Liu, Chao Zhai, Liang Feng, Li Yi
Antimicrobial peptides (AMPs) consist of molecules acting on the defense systems of numerous organisms toward tumor and multiple pathogens, such as bacteria, fungi, viruses, and parasites. Compared to traditional antibiotics, AMPs are more stable and have lower propensity for developing resistance through functioning in the innate immune system, thus having important applications in the fields of medicine, food and so on. However, despite of their high economic values, the low yield and the cumbersome extraction process in AMPs production are problems that limit their industrial application and scientific research...
August 11, 2017: Protein Expression and Purification
https://www.readbyqxmd.com/read/28807755/antimicrobial-susceptibility-of-pathogens-in-acute-uncomplicated-cystitis-cases-in-the-urology-department-of-a-community-hospital-in-japan-comparison-with-treatment-outcome-and-hospital-wide-antibiogram
#11
Toshiki Etani, Taku Naiki, Sachiyo Yamaguchi, Saori Mori, Takashi Nagai, Keitaro Iida, Ryosuke Ando, Noriyasu Kawai, Keiichi Tozawa, Tohru Mogami, Takahiro Yasui
We hypothesized that cases of uncomplicated cystitis treated in a Urology Department would display higher antimicrobial susceptibility than those reported by the hospital antibiogram. This would suggest narrow spectrum antibiotics could still be an effective treatment for uncomplicated cystitis despite this era of antimicrobial resistance. The objective of this study was thus to evaluate the rates of antimicrobial susceptibility of isolates cultured from uncomplicated cystitis cases that presented to the Urology Department of a community hospital in Japan...
August 11, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/28807622/community-associated-clostridium-difficile-infection-in-emergency-department-patients-in-western-australia
#12
Deirdre A Collins, Linda A Selvey, Antonio Celenza, Thomas V Riley
Clostridium difficile infection (CDI) is primarily associated with hospitalised patients, however, community-associated CDI (CA-CDI) has increased in Australia. We aimed to investigate the epidemiology and outcomes of CA-CDI cases presenting to hospital emergency departments in Western Australia (WA). A retrospective case-control study of CA-CDI cases presenting at six emergency departments in WA from July 2013 to June 2014 was performed. Clinical signs, recent medication, hospitalisations and potential risk factors for CA-CDI were investigated for cases (n = 34) and unmatched controls (n = 62) who were infected with another gastrointestinal pathogen, including Campylobacter spp...
August 11, 2017: Anaerobe
https://www.readbyqxmd.com/read/28805537/high-prevalence-of-extended-spectrum-%C3%AE-lactamase-producing-enterobacteriaceae-in-wild-fish-from-the-mediterranean-sea-in-algeria
#13
Soumia Brahmi, Abdelaziz Touati, Catherine Dunyach-Remy, Albert Sotto, Alix Pantel, Jean-Philippe Lavigne
AIM: We investigated the prevalence of extended-spectrum β-lactamase (ESBL)-producing Enterobacteriaceae among wild fish from the coast of Bejaia (Algeria) in the Mediterranean Sea. RESULTS: From March 2012 to August 2013, gut and gill samples of wild fish were screened for the presence of ESBL-producing Enterobacteriaceae. Strains were characterized with regard to antibiotic resistance, β-lactamase content, plasmid-mediated quinolone resistance, aminoglycoside resistance genes, and clonality (repetitive sequence-based polymerase chain reaction profiles and multilocus sequence typing)...
August 14, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28803838/current-epidemiology-of-resistance-among-gram-negative-bacilli-in-pediatric-patients-in-turkey
#14
Kubra Aykac, Yasemin Ozsurekci, Sevgen Tanir Basaranoglu, Mustafa Senol Akin, Ali Bulent Cengiz, Asiye Bicakcigil, Banu Sancak, Ates Kara, Mehmet Ceyhan
BACKGROUND: The increasing incidence of infections caused by drug-resistant Gram-negative organisms has led to a reemergence in worldwide. This study attempted to investigate the changes in resistance of Gram-negative bacteria to different classes of antibiotics and treatment options in invasive infections. METHODS: We performed this study retrospectively between January 2012 and January 2017 in our tertiary care university hospital. A total of 302 patients with Gram-negative bacterial bacteremia and meningitis were defined...
August 10, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28803549/comparative-gut-microbiota-and-resistome-profiling-of-intensive-care-patients-receiving-selective-digestive-tract-decontamination-and-healthy-subjects
#15
Elena Buelow, Teresita D J Bello González, Susana Fuentes, Wouter A A de Steenhuijsen Piters, Leo Lahti, Jumamurat R Bayjanov, Eline A M Majoor, Johanna C Braat, Maaike S M van Mourik, Evelien A N Oostdijk, Rob J L Willems, Marc J M Bonten, Mark W J van Passel, Hauke Smidt, Willem van Schaik
BACKGROUND: The gut microbiota is a reservoir of opportunistic pathogens that can cause life-threatening infections in critically ill patients during their stay in an intensive care unit (ICU). To suppress gut colonization with opportunistic pathogens, a prophylactic antibiotic regimen, termed "selective decontamination of the digestive tract" (SDD), is used in some countries where it improves clinical outcome in ICU patients. Yet, the impact of ICU hospitalization and SDD on the gut microbiota remains largely unknown...
August 14, 2017: Microbiome
https://www.readbyqxmd.com/read/28803460/-gastrostomy-tubes-indications-and-infectious-complications-in-a-tertiary-hospital
#16
M J Muñoz-Dávila, J M Xandri Ruipera, G Yagüe Guirao, C Salvador García, M Segovia Hernández
OBJECTIVE: Gastrostomy tube is the best option for long-term enteral nutrition. Among its limitations, infections represent the most frequent minor complication. Our aim is the knowledge of the number and type of gastrostomy tubes and its main indication in our hospital. In addition, prevalence of infectious complications was studied paying attention to the main etiologic agents and their antibiotic susceptibility. METHODS: Observational retrospective study from January 2010 to July 2015 through the electronic clinical history and the clinical microbiology laboratory software...
August 14, 2017: Revista Española de Quimioterapia: Publicación Oficial de la Sociedad Española de Quimioterapia
https://www.readbyqxmd.com/read/28803214/self-defensive-antibiotic-loaded-layer-by-layer-coatings-imaging-of-localized-bacterial-acidification-and-ph-triggering-of-antibiotic-release
#17
Victoria Albright, Iryna Zhuk, Yuhao Wang, Victor Selin, Betsy van de Belt-Gritter, Henk J Busscher, Henny C van der Mei, Svetlana Sukhishvili
Self-defensive antibiotic-loaded coatings have shown promise in inhibiting growth of pathogenic bacteria adhering to biomaterial implants and devices, but direct proof that their antibacterial release is triggered by bacterially-induced acidification of the immediate environment under buffered conditions remained elusive. Here, we demonstrate that Staphylococcus aureus and Escherichia coli adhering to such coatings generate highly localized acidification, even in buffered conditions, to activate pH-triggered, self-defensive antibiotic release...
August 9, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28799833/plasmid-mediated-colistin-resistance-gene-mcr-1-in-an-escherichia-coli-st10-bloodstream-isolate-in-the-sultanate-of-oman
#18
Jalila Mohsin, Tibor Pál, Jorgen Eskild Petersen, Dania Darwish, Akela Ghazawi, Tanveer Ashraf, Agnes Sonnevend
AIMS: To identify plasmid-mediated colistin resistance in clinical Enterobacteriaceae isolates in Oman, where this resistance mechanism has not been encountered yet. MATERIALS/METHODS: Twenty-two colistin-resistant Enterobacteriaceae clinical isolates collected between July 2014 and June 2016 in a tertiary care hospital in Muscat were screened by PCR for the mcr-1 and mcr-2 genes. The strain identified as mcr-1 positive was genotyped and its antibiotic susceptibility was established...
August 11, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28799127/evaluation-of-the-antimicrobial-activity-of-a-blend-of-monoglycerides-against-escherichia-coli-and-enterococci-with-multiple-drug-resistance
#19
Immacolata Anacarso, Andrea Quartieri, Riccardo De Leo, Andrea Pulvirenti
Bacterial antibiotic resistance is a natural phenomenon, seriously affecting the treatment of infections. The biggest danger is that current antibiotics are not able to eradicate the resistant strains. In recent years, alternative antibacterial substances are being sought, which can help in these cases. Fatty acids and monoglycerides are known among the natural substances for their antimicrobial properties and, important detail, bacteria do not develop resistance to them. In this work, we studied the antimicrobial effects of a monoglyceride blend against some multi-resistant Enterococci and Escherichia coli strains...
August 10, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28797969/bioactive-mesoporous-silica-nanostructures-with-anti-microbial-and-anti-biofilm-properties
#20
Paul Cătălin Balaure, Bianca Boarca, Roxana Cristina Popescu, Diana Savu, Roxana Trusca, Bogdan Ștefan Vasile, Alexandru Mihai Grumezescu, Alina Maria Holban, Alexandra Bolocan, Ecaterina Andronescu
The increasing rate of antibiotic resistant bacteria associated with nosocomial infections in severely ill patients has urged the need for new antibacterial therapies. Nanostructured materials represent emerging innovative approaches to controlled delivery of different antimicrobial drugs. Delivery systems encapsulating natural compounds with antibacterial effects, such as essential oils have shown a great potential. Herein we report the development of SiO2 mesoporous nanosystems loaded with eucalyptus (EUC), orange (ORA), and cinnamon (CIN) essential oils...
August 7, 2017: International Journal of Pharmaceutics
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