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antibiotic selection

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https://www.readbyqxmd.com/read/29145711/timing-of-antibiotics-in-the-management-of-community-acquired-sepsis-can-a-randomised-controlled-trial-of-prehospital-therapy-provide-answers
#1
Andrew A Udy, Karen Smith, Stephen Bernard
Significant tension surrounds the application of antibiotics in suspected infection. Guidelines stress the importance of early empirical broad-spectrum therapy, with select observational data suggesting inferior outcomes when this is delayed. In contrast, microbiological resistance is an ever increasing global problem, with many advocating for a more restricted, culture-driven approach to antibiotic prescription. Controlled trial data are urgently needed, although many clinicians would find withholding of antibiotic therapy unethical...
November 16, 2017: Emergency Medicine Australasia: EMA
https://www.readbyqxmd.com/read/29145237/the-impact-of-the-government-health-funding-on-prescribing-behaviors-in-community-health-institutions-in-china
#2
Gang Sun, Zuxun Lu, Yong Gan, Xiaoxin Dong, Yongbin Li, Yunxia Wang, Liqing Li
Government health funding (GHF) is a cosmopolitan problem. It is especially conspicuous in China, where drug sales become a main source of medical institutions' incomes due to limited GHF. This is well known as China's "drug maintain medical institutions (DMMIs)" system which results directly in very high use of antibiotics, injections, and corticosteroids. However, few statistical data existed in China on the association between the GHF and the prevalence of inappropriate drug prescribing, despite widespread acknowledgment of its existence...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29143818/visualization-of-chemical-modifications-in-the-human-80s-ribosome-structure
#3
S Kundhavai Natchiar, Alexander G Myasnikov, Hanna Kratzat, Isabelle Hazemann, Bruno P Klaholz
Chemical modifications of human ribosomal RNA (rRNA) are introduced during biogenesis and have been implicated in the dysregulation of protein synthesis, as is found in cancer and other diseases. However, their role in this phenomenon is unknown. Here we visualize more than 130 individual rRNA modifications in the three-dimensional structure of the human ribosome, explaining their structural and functional roles. In addition to a small number of universally conserved sites, we identify many eukaryote- or human-specific modifications and unique sites that form an extended shell in comparison to bacterial ribosomes, and which stabilize the RNA...
November 15, 2017: Nature
https://www.readbyqxmd.com/read/29141346/-etiologic-characteristics-of-shigella-sonnei-strains-isolated-from-some-areas-of-guangdong-province-and-guangxi-zhuang-autonomous-region-of-china-2014-2016
#4
B S Li, L J Chen, B X Ke, J M Lin, L Q Xu, H L Tan, D M He, Y H Liang, C W Ke, Y H Zhang
Objective: To investigated the etiologic characteristics of Shigella (S.) sonnei strains causing outbreaks and sporadic cases in some areas of Guangdong province and Guangxi Zhuang Autonomous Region during 2014-2016. Methods: Fourteen S. sonnei strains isolated from outbreaks and 6 S. sonnei strains from sporadic cases from Guangdong and Liuzhou of Guangxi Zhuang Autonomous Region were tested for antimicrobial resistance and analyzed by pulsed-field gel electrophoresis (PFGE). Six typical strains were selected for whole genome sequencing typing and compared with 51 strains isolated both at home and abroad from NCBI genome database...
November 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/29141147/a-water-soluble-galactose-decorated-cationic-photodynamic-therapy-agent-based-on-bodipy-to-selectively-eliminate-biofilm
#5
Xiaomei Dai, Xuelei Chen, Yu Zhao, Yunjian Yu, Xiaosong Wei, Xinge Zhang, Chaoxing Li
A multitude of serious chronic infections involved in bacterial biofilms that are difficult to eradicate. Here, a water-soluble galactose functionalized cationic 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY)-based photodynamic therapy agent was synthesized for selectively eliminating the bacterial biofilm. These conjugates can capture bacteria to form aggregations through electrostatic interaction and then generate a large number of reactive oxygen species (ROS) under visible light irradiation to kill the bacteria without the emergence of bacterial resistance...
November 15, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29138886/clinical-predictors-of-stenotrophomonas-maltophilia-bacteremia-in-adult-patients-with-hematologic-malignancy
#6
Si-Ho Kim, Sun Young Cho, Cheol-In Kang, Hyeri Seok, Kyungmin Huh, Young Eun Ha, Doo Ryeon Chung, Nam Yong Lee, Kyong Ran Peck, Jae-Hoon Song
Stenotrophomonas maltophilia (SM) has emerged as an important nosocomial pathogen with high morbidity and mortality. Because of its unique antimicrobial susceptibility pattern, appropriate antimicrobial therapy for SM bacteremia is still challenging, especially in immunocompromised patients. The present study was performed to assess clinical predictors of SM bacteremia in adult patients with hematologic malignancy. From 2006 through 2016, a case-control study was performed at a tertiary-care hospital. Case patients were defined as SM bacteremia in patients with hematologic malignancy...
November 14, 2017: Annals of Hematology
https://www.readbyqxmd.com/read/29138562/dual-uv-irradiation-based-metal-oxide-nanoparticles-for-enhanced-antimicrobial-activity-in-escherichia-coli-and-m13-bacteriophage
#7
Su-Eon Jin, Woochul Hwang, Hyo Jung Lee, Hyo-Eon Jin
Metal oxide (MO) nanoparticles have been studied as nano-antibiotics due to their antimicrobial activities even in antibiotic-resistant microorganisms. We hypothesized that a hybrid system of dual UV irradiation and MO nanoparticles would have enhanced antimicrobial activities compared with UV or MO nanoparticles alone. In this study, nanoparticles of ZnO, ZnTiO3, MgO, and CuO were selected as model nanoparticles. A dual UV collimated beam device of UV-A and UV-C was developed depending upon the lamp divided by coating...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29137595/study-of-bacterial-infections-among-patients-receiving-kidney-transplant-in-mashhad-iran
#8
Davood Mansury, Azad Khaledi, Kiarash Ghazvini, Mahin Ghorban Sabbagh, Hosna Zare, Mohammad Hossein Rokni-Hosseini, Hossein Vazini
OBJECTIVES: Over the past 2 decades, significant advances have been made in the management of infections after transplant; however, transplant recipients are still at high risk of infectious complications. This study aimed to evaluate the prevalence of bacterial infections and antimicrobial resistance patterns in kidney transplant recipients. MATERIALS AND METHODS: This cross-sectional study included 356 patients who received kidney transplants, regardless of the underlying disease, from 2013 to 2015 at the Montaserieh Transplant Hospital (Mashhad, Iran)...
November 15, 2017: Experimental and Clinical Transplantation
https://www.readbyqxmd.com/read/29137129/design-and-evaluation-of-novel-polymyxin-fluorescent-probes
#9
Bo Yun, Kade D Roberts, Philip E Thompson, Roger L Nation, Tony Velkov, Jian Li
Polymyxins (polymyxin B and colistin) are cyclic lipopeptide antibiotics that serve as a last-line defence against Gram-negative "superbugs". In the present study, two novel fluorescent polymyxin probes were designed through regio-selective modifications of the polymyxin B core structure at the N-terminus and the hydrophobic motif at positions 6 and 7. The resulting probes, FADDI-285 and FADDI-286 demonstrated comparable antibacterial activity (MICs 2-8 mg/L) to polymyxin B and colistin (MICs 0.5-8 mg/L) against a panel of gram-negative clinical isolates of Acinetobacter baumannii, Klebsiella pneumoniae and Pseudomonas aeruginosa...
November 11, 2017: Sensors
https://www.readbyqxmd.com/read/29136646/the-effect-of-interventions-aiming-to-optimise-the-prescription-of-antibiotics-in-dental-care-a-systematic-review
#10
Christin Löffler, Femke Böhmer
BACKGROUND: Abundant evidence in dentistry suggests that antibiotics are prescribed despite the existence of guidelines aiming to reduce the development of antibiotic resistance. This review investigated (1) which type of interventions aiming to optimise prescription of antibiotics exist in dentistry, (2) the effect of these interventions and (3) the specific strengths and limitations of the studies reporting on these interventions. METHOD: Literature search was based on Medline, Embase, Global Health, Cochrane CENTRAL, ClinicalTrials...
2017: PloS One
https://www.readbyqxmd.com/read/29136126/risk-of-subsequent-sepsis-within-90-days-of-a-previous-hospital-stay-by-type-of-antibiotic-exposure
#11
James Baggs, Johm A Jernigan, Alison Laufer Halpin, Lauren H Epstein, Kelly M Hatfield, L Clifford McDonald
Background: We examined the risk of sepsis within 90 days after discharge from a previous hospital stay by type of antibiotic received during the previous stay. Methods: We retrospectively identified a cohort of hospitalized patients from the Truven Health MarketScan Hospital Drug Database. We examined the association between the use of certain antibiotics, determined a priori, during the initial hospital stay and risk of post-discharge sepsis controlling for potential confounding factors in a multivariable logistic regression model...
November 9, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29136035/comparative-efficacy-and-safety-of-antibiotics-used-to-treat-acute-bacterial-skin-and-skin-structure-infections-results-of-a-network-meta-analysis
#12
Julian F Guest, Jaime Esteban, Anton G Manganelli, Andrea Novelli, Giuliano Rizzardini, Miquel Serra
OBJECTIVE: This NMA compared the efficacy and safety between IV antibiotics that are used in the current standard of care for managing adult patients (≥18 years of age) with ABSSSI. METHODS: Comparators were chosen on the basis that both direct and indirect comparisons between the interventions of interest could be performed. Outcomes of the analysis were selected on the basis that they are frequently measured and reported in trials involving ABSSSI patients, and only published randomised control trials of any size and duration and with any blinding status were eligible for inclusion in the analysis...
2017: PloS One
https://www.readbyqxmd.com/read/29135563/the-prevalence-and-sociodemographic-determinants-of-uninvestigated-dyspepsia-in-the-czech-republic-a-multicentre-prospective-study-accomplished-10-years-after-the-first-study-from-the-same-geographical-areas
#13
Stanislav Rejchrt, Ilona Koupil, Marcela Kopáčová, Miluška Škodová Fendrichová, Bohumil Seifert, Viktor Voříšek, Jana Špirková, Tomáš Douda, Ilja Tachecí, Jan Bureš
OBJECTIVE: The epidemiology of uninvestigated dyspepsia was studied in the Czech Republic for the first time in 2001. The aim of the current multicenter prospective study was to evaluate dyspepsia using the same methods in a representative sample of general unselected population from the same geographical areas 10 years later. PARTICIPANTS AND METHODS: A total of 38 147 individuals comprised the general population for a random two-step selection process. A total of 1836 participants (863 males and 973 females; aged 5-98 years) took part in the questionnaire-based study...
November 10, 2017: European Journal of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/29134768/determination-of-multiple-antibiotics-in-leafy-vegetables-using-quechers-uhplc-ms-ms
#14
Xiaolu Yu, Hang Liu, Chengjun Pu, Junhao Chen, Ying Sun, Lin Hu
A modified quick, easy, cheap, effective, rugged and safe method was established for simultaneous extraction and cleanup of multiple antibiotics in leafy vegetables, and ultra high performance liquid chromatography with tandem mass spectrometry was used for analysis. Antibiotics in leafy vegetables were extracted with citric acid/sodium citrate in mixed solvents consisting of acetonitrile/methanol (85:15 v/v) from 10 g of vegetables. Octadecylsilyl and graphitized carbon black were used as dispersant adsorbents...
November 14, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29133838/fungal-networks-serve-as-novel-ecological-routes-for-enrichment-and-dissemination-of-antibiotic-resistance-genes-as-exhibited-by-microcosm-experiments
#15
Rashid Nazir, Ju-Pei Shen, Jun-Tao Wang, Hang-Wei Hu, Ji-Zheng He
Antibiotic resistance genes (ARGs) in the environment and their subsequent acquisition by clinically important microorganisms are a serious concern. However, the spread of environmental ARGs remain largely unknown. We report, for the first time, the involvement of soil fungi in the distribution of bacteria with ARGs via soil microcosms. qPCR assay detected unique ARGs specifically found in the mycosphere of different fungi. Interestingly, the taxonomically and ecologically different fungi exerted different selection pressures on ARGs originating from the same source...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29133814/structural-remodeling-and-oligomerization-of-human-cathelicidin-on-membranes-suggest-fibril-like-structures-as-active-species
#16
Enea Sancho-Vaello, Patrice François, Eve-Julie Bonetti, Hauke Lilie, Sebastian Finger, Fernando Gil-Ortiz, David Gil-Carton, Kornelius Zeth
Antimicrobial peptides as part of the mammalian innate immune system target and remove major bacterial pathogens, often through irreversible damage of their cellular membranes. To explore the mechanism by which the important cathelicidin peptide LL-37 of the human innate immune system interacts with membranes, we performed biochemical, biophysical and structural studies. The crystal structure of LL-37 displays dimers of anti-parallel helices and the formation of amphipathic surfaces. Peptide-detergent interactions introduce remodeling of this structure after occupation of defined hydrophobic sites at the dimer interface...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29133802/a-conformational-switch-in-initiation-factor-2-controls-the-fidelity-of-translation-initiation-in-bacteria
#17
Kelvin Caban, Michael Pavlov, Måns Ehrenberg, Ruben L Gonzalez
Initiation factor (IF) 2 controls the fidelity of translation initiation by selectively increasing the rate of 50S ribosomal subunit joining to 30S initiation complexes (ICs) that carry an N-formyl-methionyl-tRNA (fMet-tRNA(fMet)). Previous studies suggest that rapid 50S subunit joining involves a GTP- and fMet-tRNA(fMet)-dependent "activation" of IF2, but a lack of data on the structure and conformational dynamics of 30S IC-bound IF2 has precluded a mechanistic understanding of this process. Here, using an IF2-tRNA single-molecule fluorescence resonance energy transfer signal, we directly observe the conformational switch that is associated with IF2 activation within 30S ICs that lack IF3...
November 14, 2017: Nature Communications
https://www.readbyqxmd.com/read/29133567/risk-factors-and-outcomes-associated-with-multidrug-resistant-acinetobacter-baumannii-upon-icu-admission
#18
Natalia Blanco, Anthony D Harris, Clare Rock, J Kristie Johnson, Lisa Pineles, Robert A Bonomo, Arjun Srinivasan, Melinda M Pettigrew, Kerri A Thom
Introduction: Multi-drug resistant (MDR) Acinetobacter baumannii, associated with broad-spectrum antibiotic use, is an important nosocomial pathogen associated with morbidity and mortality. This study aimed to investigate the prevalence of MDR A. baumannii perirectal colonization among adult patients at ICU admission over a 5-year period, and to identify risk factors and outcomes associated with colonization.Methods: A retrospective cohort analysis of patients admitted to the medical (MICU) and surgical intensive care units (SICU) at the University of Maryland Medical Center from May 2005 to September 2009 was performed using perirectal surveillance cultures on admission...
November 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29133557/a-novel-mechanism-of-inactivating-antibacterial-nitro-compounds-in-the-human-pathogen-staphylococcus-aureus-by-overexpression-of-a-nadh-dependent-flavin-nitroreductase
#19
Ebaa M El-Hossary, Konrad U Förstner, Patrice François, Damien Baud, Karin Streker, Jacques Schrenzel, Knut Ohlsen, Ulrike Holzgrabe
Recently, the nitro substituted bisquaternary bisnaphthalimides were reported to have substantial anti-infective activity against Gram-positive bacteria, including methicillin-resistant Staphylococcus aureus (MRSA). Here, we selected resistant S. aureus clones by cultivation in increasing concentrations of the most active compound MT02. Interestingly, MT02 resistant variants induced a diffusible red color of the broth. Chromatographic and spectroscopic investigations revealed a stepwise reduction of the bisquaternary bisnaphthalimides̀ nitro groups to amino groups...
November 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29133391/adaptive-benefits-from-small-mutation-supplies-in-an-antibiotic-resistance-enzyme
#20
Merijn L M Salverda, Jeroen Koomen, Bertha Koopmanschap, Mark P Zwart, J Arjan G M de Visser
Populations with large mutation supplies adapt via the "greedy" substitution of the fittest genotype available, leading to fast and repeatable short-term responses. At longer time scales, smaller mutation supplies may in theory lead to larger improvements when distant high-fitness genotypes more readily evolve from lower-fitness intermediates. Here we test for long-term adaptive benefits from small mutation supplies using in vitro evolution of an antibiotic-degrading enzyme in the presence of a novel antibiotic...
November 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
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