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https://www.readbyqxmd.com/read/29029160/characterization-of-the-actinobacillus-pleuropneumoniae-sxt-related-integrative-and-conjugative-element-iceapl2-and-analysis-of-the-encoded-flor-protein-hydrophobic-residues-in-transmembrane-domains-contribute-dynamically-to-florfenicol-and-chloramphenicol
#1
Yinghui Li, Yanwen Li, Roberto Fernandez Crespo, Leon G Leanse, Paul R Langford, Janine T Bossé
Objectives: To characterize ICEApl2, an SXT-related integrative and conjugative element (ICE) found in a clinical isolate of the porcine pathogen Actinobacillus pleuropneumoniae, and analyse the functional nature of the encoded FloR. Methods: ICEApl2 was identified in the genome of A. pleuropneumoniae MIDG3553. Functional analysis was done using conjugal transfer experiments. MIDG3553 was tested for susceptibility to the antimicrobials for which resistance genes are present in ICEApl2...
October 6, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29029078/prebiotic-potential-of-pectin-and-pectic-oligosaccharides-to-promote-anti-inflammatory-commensal-bacteria-in-the-human-colon
#2
Wing Sun Faith Chung, Marjolein Meijerink, Birgitte Zeuner, Jesper Holck, Petra Louis, Anne Meyer, Jerry M Wells, Harry J Flint, Sylvia H Duncan
Dietary plant cell wall carbohydrates are important in modulating the composition and metabolism of the complex gut microbiota, which can impact on health. Pectin is a major component of plant cell walls. Based on studies in model systems and available bacterial isolates and genomes, the capacity to utilize pectins for growth is widespread among colonic Bacteroidetes but relatively uncommon among Firmicutes. One Firmicutes species promoted by pectin is Eubacterium eligens. E. eligens DSM3376 utilizes apple pectin and encodes a broad repertoire of pectinolytic enzymes, including a highly abundant pectate lyase of around 200 kDa that is expressed constitutively...
October 3, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/29029072/detection-of-optra-in-the-african-continent-tunisia-within-a-mosaic-enterococcus-faecalis-plasmid-from-urban-wastewaters
#3
Ana R Freitas, Houyem Elghaieb, Ricardo León-Sampedro, Mohamed Salah Abbassi, Carla Novais, Teresa M Coque, Abdennaceur Hassen, Luisa Peixe
Objectives: Oxazolidinone resistance is a serious limitation in the treatment of MDR Enterococcus infections. Plasmid-mediated oxazolidinone resistance has been strongly linked to animals where the use of phenicols might co-select resistance to both antibiotic families. Our goal was to assess the diversity of genes conferring phenicol/oxazolidinone resistance among diverse enterococci and to characterize the optrA genetic environment. Methods: Chloramphenicol-resistant isolates (>16 mg/L, n = 245) from different sources (hospitals/healthy humans/wastewaters/animals) in Portugal, Angola and Tunisia (1996-2016) were selected...
September 26, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29028899/phandango-an-interactive-viewer-for-bacterial-population-genomics
#4
James Hadfield, Nicholas J Croucher, Richard J Goater, Khalil Abudahab, David M Aanensen, Simon R Harris
Summary: Fully exploiting the wealth of data in current bacterial population genomics datasets requires synthesising and integrating different types of analysis across millions of base pairs in hundreds or thousands of isolates. Current approaches often use static representations of phylogenetic, epidemiological, statistical and evolutionary analysis results that are difficult to relate to one another. Phandango is an interactive application running in a web browser allowing fast exploration of large-scale population genomics datasets combining the output from multiple genomic analysis methods in an intuitive and interactive manner...
September 25, 2017: Bioinformatics
https://www.readbyqxmd.com/read/29028174/could-frequent-carbapenem-use-be-a-risk-factor-for-colistin-resistance
#5
Aycan Gundogdu, Aysegul Ulu-Kilic, Huseyin Kilic, Esra Ozhan, Dilek Altun, Ozlem Cakir, Emine Alp
AIMS: The antibiotic colistin, which had been previously abandoned, is being brought back as a last line of defense against bacterial infection. However, colistin resistance was reported shortly after its reintroduction. This study evaluated the risk factors for colonization/infections due to colistin-resistant Acinetobacter baumannii (ColR-Ab) and Klebsiella pneumoniae (ColR-Kp) strains and characterized the molecular epidemiology of these two strains. RESULTS: Age, previous hospitalization duration, and previous use of carbapenem and colistin were risk factors for ColR-Kp, whereas previous use of carbapenem and colistin was a risk factor for ColR-Ab...
October 13, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/29027582/bioleaching-of-gold-and-silver-from-waste-printed-circuit-boards-by-pseudomonas-balearica-sae1-isolated-from-an-e-waste-recycling-facility
#6
Anil Kumar, Harvinder Singh Saini, Sudhir Kumar
Indigenous bacterial strain Pseudomonas balearica SAE1, tolerant to e-waste toxicity was isolated from an e-waste recycling facility Exigo Recycling Pvt. Ltd., India. Toxicity tolerance of bacterial strain was analyzed using crushed (particle size ≤150 µm) waste computer printed circuit boards (PCBs)/liter (L) of culture medium. The EC50 value for SAE1 was 325.7 g/L of the e-waste pulp density. Two-step bioleaching was then applied to achieve the dissolution of gold (Au) and silver (Ag) from the e-waste...
October 13, 2017: Current Microbiology
https://www.readbyqxmd.com/read/29027519/transmission-in-the-origins-of-bacterial-diversity-from-ecotypes-to-phyla
#7
Frederick M Cohan
Any two lineages, no matter how distant they are now, began their divergence as one population splitting into two lineages that could coexist indefinitely. The rate of origin of higher-level taxa is therefore the product of the rate of speciation times the probability that two new species coexist long enough to reach a particular level of divergence. Here I have explored these two parameters of disparification in bacteria. Owing to low recombination rates, sexual isolation is not a necessary milestone of bacterial speciation...
October 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/29027495/monitoring-and-managing-antibiotic-resistance-in-refugee-children
#8
Helena C Maltezou, Dana Elhadad, Daniel Glikman
The past decade the Middle East and Southeastern Europe have witnessed an enormous movement of refugees due to the Syrian war and conflicts in Asia and Africa. Although carriage of and infections with multi-drug resistant (MDR) pathogens in refugees have been reported, pediatric data are scarce. Areas covered: MDR bacterial carriage and infections, and MDR-tuberculosis (TB) in refugee children from 2010. Expert commentary: High MDR carriage rates in refugee children are attributed to high pre-civil war MDR rates, war-damaged infrastructure and healthcare systems, and poor hygiene conditions...
October 13, 2017: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/29027311/natural-compound-licochalcone-b-induced-extrinsic-and-intrinsic-apoptosis-in-human-skin-melanoma-a375-and-squamous-cell-carcinoma-a431-cells
#9
Tae-Ho Kang, Goo Yoon, In-A Kang, Ha-Na Oh, Jung-Il Chae, Jung-Hyun Shim
Licochalcone B (Lico B), which is normally isolated from the roots of Glycyrrhiza inflata (Chinese Licorice), generally classified into organic compounds including retrochalcones. Potential pharmacological properties of Lico B include anti-inflammatory, anti-bacterial, anti-oxidant, and anti-cancer activities. However, its biological effects on melanoma and squamous cell carcinoma (SCC) are unknown. Based on these known facts, this study investigated the role of Lico B in apoptosis, through the extrinsic and intrinsic pathways and additional regulation of specificity protein 1 in human skin cancer cell lines...
October 13, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/29027059/bacterial-and-archaeal-communities-inhabiting-mussels-sediment-and-water-in-indonesian-anchialine-lakes
#10
D F R Cleary, A R M Polónia
Anchialine lakes are a globally rare and unique ecosystem consisting of saline lakes surrounded by land and isolated from the surrounding marine environment. These lakes host a unique flora and fauna including numerous endemic species. Relatively few studies have, however, studied the prokaryote communities present in these lakes and compared them with the surrounding 'open water' marine environment. In the present study, we used a 16S rRNA gene barcoded pyrosequencing approach to examine prokaryote (Bacteria and Archaea) composition in three distinct biotopes (sediment, water and the mussel Brachidontes sp...
October 12, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/29026795/the-prevalence-of-plasmid-mediated-quinolone-resistance-genes-in-escherichia-coli-isolated-from-hospital-wastewater-sources-in-tehran-iran
#11
Reza Ranjbar, Omid Farahani
BACKGROUND: Considering the importance of hospital wastewaters as potential reservoirs for the dissemination of bacterial pathogens such as Escherichia coli and antibiotic resistance genes in the environment, the need for such information becomes imperative. METHODS: E. coli strains were isolated from hospital wastewater sources in Tehran, Iran, over a 24-month sampling period (Jun 2014- Jun 2016) and identified using standard bacteriological methods. Quinolone resistance among the strains was determined using Kirby-Bauer method and the frequency of plasmid-mediated quinolone resistance genes (qnrA, qnrB, qnrS) was investigated by PCR...
September 2017: Iranian Journal of Public Health
https://www.readbyqxmd.com/read/29026656/phylogenomics-and-comparative-genomics-of-lactobacillus-salivarius-a-mammalian-gut-commensal
#12
Hugh M B Harris, Maxence J B Bourin, Marcus J Claesson, Paul W O'Toole
The genus Lactobacillus is a diverse group with a combined species count of over 200. They are the largest group within the lactic acid bacteria and one of the most important bacterial groups involved in food microbiology and human nutrition because of their fermentative and probiotic properties. Lactobacillus salivarius, a species commonly isolated from the gastrointestinal tract of humans and animals, has been described as having potential probiotic properties and results of previous studies have revealed considerable functional diversity existing on both the chromosomes and plasmids...
August 2017: Microbial Genomics
https://www.readbyqxmd.com/read/29026655/sharing-of-carbapenemase-encoding-plasmids-between-enterobacteriaceae-in-uk-sewage-uncovered-by-minion-sequencing
#13
Catherine Ludden, Sandra Reuter, Kim Judge, Theodore Gouliouris, Beth Blane, Francesc Coll, Plamena Naydenova, Martin Hunt, Alan Tracey, Katie L Hopkins, Nicholas M Brown, Neil Woodford, Julian Parkhill, Sharon J Peacock
Dissemination of carbapenem resistance among pathogenic Gram-negative bacteria is a looming medical emergency. Efficient spread of resistance within and between bacterial species is facilitated by mobile genetic elements. We hypothesized that wastewater contributes to the dissemination of carbapenemase-producing Enterobacteriaceae (CPE), and studied this through a cross-sectional observational study of wastewater in the East of England. We isolated clinically relevant species of CPE in untreated and treated wastewater, confirming that waste treatment does not prevent release of CPE into the environment...
July 2017: Microbial Genomics
https://www.readbyqxmd.com/read/29026654/population-genetic-structuring-of-methicillin-resistant-staphylococcus-aureus-clone-emrsa-15-within-uk-reflects-patient-referral-patterns
#14
Tjibbe Donker, Sandra Reuter, James Scriberras, Rosy Reynolds, Nicholas M Brown, M Estée Török, Richard James, East Of England Microbiology Research Network, David M Aanensen, Stephen D Bentley, Matthew T G Holden, Julian Parkhill, Brian G Spratt, Sharon J Peacock, Edward J Feil, Hajo Grundmann
Antibiotic resistance forms a serious threat to the health of hospitalised patients, rendering otherwise treatable bacterial infections potentially life-threatening. A thorough understanding of the mechanisms by which resistance spreads between patients in different hospitals is required in order to design effective control strategies. We measured the differences between bacterial populations of 52 hospitals in the United Kingdom and Ireland, using whole-genome sequences from 1085 MRSA clonal complex 22 isolates collected between 1998 and 2012...
July 2017: Microbial Genomics
https://www.readbyqxmd.com/read/29026619/16s-rrna-deep-sequencing-identifies-actinotignum-schaalii-as-the-major-component-of-a-polymicrobial-intra-abdominal-infection-and-implicates-a-urinary-source
#15
Andrew Bryan, Lindsey M Kirkpatrick, John J Manaloor, Stephen J Salipante
Introduction. It can be difficult to catalogue the individual organisms comprising polymicrobial patient infections, both because conventional clinical microbiological culture does not facilitate the isolation and enumeration of all members of a complex microbial community, and because fastidious organisms may be mixed with organisms that grow rapidly in vitro. Empiric antimicrobial treatment is frequently employed based on the anatomical site and the suspected source of the infection, especially when an appropriately collected surgical specimen is not obtained...
May 2017: JMM Case Reports
https://www.readbyqxmd.com/read/29026472/clinical-features-and-antimicrobial-resistance-of-bacterial-agents-of-ventilator-associated-tracheobronchitis-in-hamedan-iran
#16
Seyyed Hamid Hashemi, Naeimeh Hashemi, Farzaneh Esna-Ashari, Abbas Taher, Arash Dehghan
OBJECTIVES: Ventilator-associated tracheobronchitis (VAT) is a common cause of mortality and morbidity in patients admitted to intensive care units (ICUs). This study was conducted to evaluate the clinical course, etiology, and antimicrobial resistance of bacterial agents of VAT in ICUs in Hamedan, Iran. METHODS: During a 12-month period, all patients with VAT in a medical and a surgical ICU were included. The criteria for the diagnosis of VAT were fever, mucus production, a positive culture of tracheal secretions, and the absence of lung infiltration...
September 2017: Oman Medical Journal
https://www.readbyqxmd.com/read/29025934/draft-genome-sequence-of-salmonella-enterica-serovar-senftenberg-070885-and-its-linalool-adapted-mutant
#17
Amit Hollander, Emmanuel Kalily, Dina Shachar, Sima Yaron, Yael Danin-Poleg
Here we report the genome sequences of both Salmonella Senftenberg 070885, a clinical isolate from the 2007 outbreak linked to basil, and its mutant linalool-adapted S Senftenberg (LASS). These draft genomes of S Senftenberg may enable the identification of bacterial genes responsible for resistance to basil oil.
October 12, 2017: Genome Announcements
https://www.readbyqxmd.com/read/29025364/pharmacokinetic-pharmacodynamic-parameters-for-treatment-optimization-of-infection-due-to-antibiotic-resistant-bacteria-a-summary-for-practical-purposes-in-children-and-adults
#18
Giulia Gustinetti, Giuliana Cangemi, Roberto Bandettini, Elio Castagnola
In the last years, there has been a tremendous increase in the incidence of bacterial infections due to resistant strains, especially multi-drug resistant Gram-negative bacilli. In Europe, a north to south and a west to east gradient was noticed, with more than one third of the K. pneumonia isolates being resistant to carbapenems in few countries. New antibiotics are lacking and, as a consequence, pharmacokinetic/pharmacodynamic parameters, normalized to pathogen minimal inhibitory concentration, are used with increased frequency to treat infections due to difficult-to-treat pathogens...
October 13, 2017: Journal of Chemotherapy
https://www.readbyqxmd.com/read/29024922/isolation-and-whole-genome-analysis-of-endospore-forming-bacteria-from-heroin
#19
Jörn Kalinowski, Björn Ahrens, Arwa Al-Dilaimi, Anika Winkler, Daniel Wibberg, Uwe Schleenbecker, Christian Rückert, Roman Wölfel, Gregor Grass
Infections caused by endospore-forming bacteria have been associated with severe illness and death among persons who inject drugs. Analysis of the bacteria residing in heroin has thus been biased towards species that affect human health. Similarly, exploration of the bacterial diversity of seized street market heroin correlated with the skin microflora of recreational heroin users insofar as different Staphylococus spp. or typical environmental endospore formers including Bacillus cereus and other Bacilli outside the B...
October 4, 2017: Forensic Science International. Genetics
https://www.readbyqxmd.com/read/29024820/coating-of-silicone-with-mannoside-pamam-dendrimers-to-enhance-formation-of-non-pathogenic-escherichia-coli-biofilms-against-colonization-of-uropathogens
#20
Zhiling Zhu, Fei Yu, Haoqing Chen, Jun Wang, Analette I Lopez, Quan Chen, Siheng Li, Yuyu Long, Rabih O Darouiche, Richard A Hull, Lijuan Zhang, Chengzhi Cai
Bacterial interference using non-pathogenic Escherichia coli 83972 is a novel strategy for preventing catheter-associated urinary tract infection (CAUTI). Crucial to the success of this strategy is to establish a high coverage and stable biofilm of the non-pathogenic bacteria on the catheter surface. However, this non-pathogenic strain is sluggish to form biofilms on silicone as the most widely used material for urinary catheters. We have addressed this issue by modifying the silicone catheter surfaces with mannosides that promote the biofilm formation, but the stability of the non-pathogenic biofilms challenged by uropathogens over long-term remains a concern...
October 9, 2017: Acta Biomaterialia
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