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Antibiotics resistence

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https://www.readbyqxmd.com/read/28654543/extended-versus-narrow-spectrum-antibiotics-in-the-management-of-uncomplicated-appendicitis-in-children-a-propensity-matched-comparative-effectiveness-study
#1
Danielle B Cameron, Patrice Melvin, Dionne A Graham, Charity C Glass, Stephanie K Serres, Matthew P Kronman, Jacqueline M Saito, Shawn J Rangel
OBJECTIVE: The aim of this study was to compare the effectiveness of extended versus narrow spectrum antibiotics in preventing surgical site infections (SSIs) and hospital revisits in children with uncomplicated appendicitis. SUMMARY OF BACKGROUND DATA: There is a paucity of high-quality evidence in the pediatric literature comparing the effectiveness of extended versus narrow-spectrum antibiotics in the prevention of SSIs associated with uncomplicated appendicitis...
June 26, 2017: Annals of Surgery
https://www.readbyqxmd.com/read/28654368/evaluation-of-carbapenem-resistance-mechanisms-and-its-association-with-pseudomonas-aeruginosa-infections-in-the-northwest-of-iran
#2
Mohammad Taghi Akhi, Younes Khalili, Reza Ghotaslou, Saber Yousefi, Hossein Samadi Kafil, Behrooz Naghili, Vajihe Sheikhalizadeh
The aims of this study were to determine carbapenem resistance mechanisms, molecular epidemiological relationship, clinical impact, and patient outcome of carbapenem-resistant Pseudomonas aeruginosa (CRPA) infections. A total of 42 nonduplicated CRPA were recovered from Urmia, Iran. Antimicrobial susceptibility tests were carried out using phenotypic methods. The carbapenem resistance mechanisms such as carbapenemase genes, efflux pump hyperexpression, AmpC overproduction, and OprD gene downregulation were determined by phenotypic and molecular methods...
June 27, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28654325/a-bright-future-for-antibiotics
#3
Donna Matzov, Anat Bashan, Ada Yonath
Multidrug resistance is a global threat as the clinically available potent antibiotic drugs are becoming exceedingly scarce. For example, increasing drug resistance among gram-positive bacteria is responsible for approximately one-third of nosocomial infections. As ribosomes are a major target for these drugs, they may serve as suitable objects for novel development of next-generation antibiotics. Three-dimensional structures of ribosomal particles from Staphylococcus aureus obtained by X-ray crystallography have shed light on fine details of drug binding sites and have revealed unique structural motifs specific for this pathogenic strain, which may be used for the design of novel degradable pathogen-specific, and hence, environmentally friendly drugs...
June 20, 2017: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/28654257/lipophosphonoxins-ii-design-synthesis-and-properties-of-novel-broad-spectrum-antibacterial-agents
#4
Gabriela Seydlová, Radek Pohl, Eva Zborníková, Marcel Ehn, Ondrej Simak, Natalya Panova, Milan Kolar, Katerina Bogdanova, Renata Vecerova, Radovan Fiser, Hana Šanderová, Dragana Vítovská, Petra Sudzinová, Jiří Pospíšil, Oldrich Benada, Tomáš Křížek, David Sedlak, Petr Bartunek, Libor Krasny, Dominik Rejman
The increase in the number of bacterial strains resistant to known antibiotics is alarming. In this study we report the synthesis of novel compounds termed Lipophosphonoxins II (LPPO II). We show that LPPO II display excellent activities against Gram positive and -negative bacteria, including pathogens and multiresistant strains. We describe their mechanism of action - plasmatic membrane pore-forming activity selective for bacteria. Importantly, LPPO II neither damage nor cross the eukaryotic plasmatic membrane at their bactericidal concentrations...
June 27, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28654117/synthesis-and-biological-evaluation-of-novel-acyclic-and-cyclic-glyoxamide-based-derivatives-as-bacterial-quorum-sensing-and-biofilm-inhibitors
#5
Shashidhar Nizalapur, Onder Kimyon, Eugene Yee, Mohan M Bhadbhade, Mike Manefield, Mark Willcox, David StC Black, Naresh Kumar
Bacteria regulate the expression of various virulence factors and processes such as biofilm formation through a chemically-mediated communication mechanism called quorum sensing. Bacterial biofilms contribute to antimicrobial resistance as they can protect bacteria embedded in their matrix from the effects of antibiotics. Thus, developing novel quorum sensing inhibitors, which can inhibit biofilm formation, is a viable strategy to combat antimicrobial resistance. We report herein the synthesis of novel acyclic and cyclic glyoxamide derivatives via ring-opening reactions of N-acylisatins...
June 27, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28653930/identification-and-growth-optimization-of-a-marine-bacillus-dk1-sa11-having-potential-of-producing-broad-spectrum-antimicrobial-compounds
#6
Muhammad Naseem Khan, Hong Lin, Meng Li, Jingxue Wang, Zulfiqar Ali Mirani, Seema Ismat Khan, Muhammad Aslam Buzdar, Imran Ali, Khalid Jamil
Control of harmful bacteria in food, aquaculture, pharmaceuticals, agriculture, hospitals and recreation water pools are of great global concern. Marine bacteria are an enormous source of bio-controlling agents. The aim of this study was to identify and optimize the growth conditions including effect of different biotic and abiotic factors on antimicrobial activity of strain DK1-SA11 isolated from Qingdao Bay of China Yellow Sea. Microscopic characterization, API® 20E and 50 CHB kit base carbohydrates utilization, 16S rDNA and DNA gyrB gene sequencing studies identified the bacterium as Bacillus subtilis subsp...
May 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28653923/kitchen-phytochemicals-from-allium-cepa-their-role-in-multidrug-resistance
#7
Gunpreet Kaur, Vikas Gupta, Ajay Francis Christopher, Renu Bansal, Parveen Bansal
Bacterial resistance to antibiotics is increasingly becoming a concern to public health. Current antibiotics have failed to bring desirable results to many bacterial infections due to multi-resistant strains. So, concerted efforts are being made to curve this with the help of dietary phytohemicals. A number of dietary phytochemical are being put to trials for antimicrobial activity; however it is worthwhile to search such a part of diet that is very frequently used by major population. Keeping this view in mind an effort has been made to evaluate the antimicrobial activity of most common vegetable component Allium cepa...
May 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28653916/biological-activities-of-allium-sativum-and-zingiber-officinale-extracts-on-clinically-important-bacterial-pathogens-their-phytochemical-and-ft-ir-spectroscopic-analysis
#8
Uzma Azeem Awan, Shaukat Ali, Amna Mir Shahnawaz, Irsa Shafique, Atiya Zafar, Muhammad Abdul Rauf Khan, Tahseen Ghous, Azhar Saleem, Saiqa Andleeb
The spread of bacterial infectious diseases is a major public threat. Herbs and spices have offered an excellent, important and useful source of antimicrobial agents against many pathological infections. In the current study, the antimicrobial potency of fresh, naturally and commercial dried Allium sativum and Zingiber officinale extracts had been investigated against seven local clinical bacterial isolates such as Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumonia, Staphylococcus aureus, Streptococcus pyogenes, Staphylococcus epidermidis, and Serratia marcesnces by the agar disc diffusion method...
May 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28653438/antibiotic-prescribing-habits-among-norwegian-dentists-a-survey-over-25%C3%A2-years-1990-2015
#9
Hans R Preus, Karen W Fredriksen, Andrea E Vogsland, Leiv Sandvik, Jostein I Grytten
Bacterial antibiotic resistance is a steadily growing global problem, which today is compared with issues such as global warming, ozone depletion, and extinction of species. Consequently, calls come from global, Pan-European, and national authorities to gain insight into, limit, and stringently qualify the use of antibiotics in human and veterinary medicine, as well as in food production. Dentists are not considered to be frequent prescribers of antibiotics. However, few studies have identified how much, and in which situations, dentists prescribe such drugs...
June 27, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/28652785/prevalence-and-antibiotic-resistance-of-coagulase-negative-staphylococci-isolated-from-poultry-farms-in-three-regions-of-ghana
#10
Vivian Etsiapa Boamah, Christian Agyare, Hayford Odoi, Francis Adu, Stephen Yao Gbedema, Anders Dalsgaard
The use of antibiotics in animal production has been associated with the development and spread of antibiotic-resistant organisms including commensals. Coagulase-negative Staphylococcus (CoNS) species, which were until recently considered non-pathogenic, have been associated with opportunistic infections and high resistance to several antibiotics. This study sought to determine the prevalence, identity, and phenotypic resistance of coagulase-negative Staphylococcus spp. isolated from some selected poultry farms and farm workers in the Ashanti, Brong Ahafo, and Greater Accra regions of Ghana...
2017: Infection and Drug Resistance
https://www.readbyqxmd.com/read/28652709/efficacy-of-antibiotic-treatment-of-implant-associated-staphylococcus-aureus-infections-with-moxifloxacin-flucloxacillin-rifampin-and-combination-therapy-an-animal-study
#11
Felix Greimel, Christine Scheuerer, Andre Gessner, Michaela Simon, Thomas Kalteis, Joachim Grifka, Achim Benditz, Hans-Robert Springorum, Jens Schaumburger
The efficacy of antibiotic monotherapy and combination therapy in the treatment of implant-associated infection by Staphylococcus aureus was evaluated in an animal study. The femoral medullary cavity of 66 male Wistar rats was contaminated with S. aureus (ATCC 29213) and a metal device was implanted, of which 61 could be evaluated. Six treatment groups were studied: flucloxacillin, flucloxacillin in combination with rifampin, moxifloxacin, moxifloxacin in combination with rifampin, rifampin, and a control group with aqua...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28652609/a-novel-stress-response-mechanism-triggered-by-indole-involved-in-quorum-quenching-enzyme-moml-and-iron-sulfur-cluster-in-muricauda-olearia-th120
#12
Yan Wang, Hui Li, Xinxin Cui, Xiao-Hua Zhang
Indole, as a signal molecule, is involved in multiple physiological behavior including biofilm formation, antibiotic resistance and virulence. In this study, we demonstrated that indole was involved in iron deficient and H2O2 stress response in Muricauda olearia Th120. Transcriptome analysis showed that totally 206 genes were regulated by exogenous indole. Besides, momL-suf gene cluster, consisting of quorum quenching enzyme coding gene momL and iron-sulfur biosynthetic genes suf, were involved in indole-induced stress response pathway...
June 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28652437/increased-resistance-of-skin-flora-to-antimicrobial-prophylaxis-in-patients-undergoing-hip-revision-arthroplasty
#13
Heinrich M L Mühlhofer, Lukas Deiss, Philipp Mayer-Kuckuk, Florian Pohlig, Norbert Harrasser, Ulrich Lenze, Hans Gollwitzer, Christian Suren, Peter Prodinger, Rüdiger VON Eisenhart-Rothe, Johannes Schauwecker
BACKGROUND/AIM: Prosthetic joint infection (PJI) remains a major complication after total joint replacement and is the primary indication for revision arthroplasty. Specifically, coagulase-negative Staphylococci (CNS) can cause low-grade infections. Despite the use of cephalosporin-based antimicrobial prophylaxis (AMP) and antiseptic treatment at the surgical site, evidence suggests that a significant number of cases of dermal CNS results in low-grade PJI. Thus, this study examined the bacterial colonization and resistance patterns at the surgical site...
July 2017: In Vivo
https://www.readbyqxmd.com/read/28652348/rapid-phenotypic-antimicrobial-susceptibility-testing-using-nanoliter-arrays
#14
Jonathan Avesar, Dekel Rosenfeld, Marianna Truman-Rosentsvit, Tom Ben-Arye, Yuval Geffen, Moran Bercovici, Shulamit Levenberg
Antibiotic resistance is a major global health concern that requires action across all sectors of society. In particular, to allow conservative and effective use of antibiotics clinical settings require better diagnostic tools that provide rapid determination of antimicrobial susceptibility. We present a method for rapid and scalable antimicrobial susceptibility testing using stationary nanoliter droplet arrays that is capable of delivering results in approximately half the time of conventional methods, allowing its results to be used the same working day...
June 26, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28652240/the-non-antibiotic-macrolide-em703-improves-survival-in-a-model-of-quinolone-treated-pseudomonas-aeruginosa-airway-infection
#15
Gopinath Kasetty, Ravi K V Bhongir, Praveen Papareddy, Heiko Herwald, Arne Egesten
Macrolide antibiotics are used as anti-inflammatory agents, e.g. for prevention of exacerbations in COPD and cystic fibrosis. Several studies have shown improved outcomes after addition of macrolides to beta-lactam antibiotics when treating severe community-acquired pneumonia. However, a beneficial effect of macrolides when treating Gram-negative bacterial airway infections, e.g. those caused by Pseudomonas aeruginosa, remains to be shown. Macrolide antibiotics have significant side effects, in particular motility-stimulating activity of the gastrointestinal tract and promotion of bacterial resistance...
June 26, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28652237/the-candidate-antimalarial-drug-mmv665909-causes-oxygen-dependent-mrna-mistranslation-and-synergises-with-quinoline-derived-antimalarials
#16
Cindy Vallières, Simon V Avery
To cope with growing resistance to current antimalarials, new drugs with novel modes of action are urgently needed. Molecules targeting protein synthesis appear to be promising candidates. We identified a compound (MMV665909) from the MMV Malaria Box of candidate antimalarials that could produce synergistic growth inhibition with the aminoglycoside antibiotic paromomycin, suggesting a possible action of the compound in mRNA mistranslation. This mechanism of action was substantiated with the yeast cell model using available reporters of mistranslation and other genetic tools...
June 26, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28652236/synthetic-cyclic-peptomers-as-type-iii-secretion-system-inhibitors
#17
Hanh Lam, Joshua Schwochert, Yongtong Lao, Tannia Lau, Cameron Lloyd, Justin Luu, Olivia Kooner, Jessica Morgan, Scott Lokey, Victoria Auerbuch
Antibiotic resistant bacteria are an emerging threat to global public health. New classes of antibiotics and tools for antimicrobial discovery are urgently needed. The type III secretion system (T3SS), which is required by dozens of Gram-negative bacteria for virulence but largely absent from non-pathogenic bacteria, is a promising virulence blocker target. The ability of mammalian cells to recognize the presence of a functional T3SS and trigger NFκB activation provides a rapid and sensitive method to identify chemical inhibitors of T3SS activity...
June 26, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28652197/emergence-of-drug-resistant-bacteria-at-the-hajj-a-systematic-review
#18
REVIEW
Thongpan Leangapichart, Jean-Marc Rolain, Ziad A Memish, Jaffar A Al-Tawfiq, Philippe Gautret
BACKGROUND: Hajj is the annual mass gathering of Muslims, and is a reservoir and potential source of bacterial transmission. The emergence of bacterial transmission, including multi-drug resistance (MDR) bacteria, during Hajj has not been systematically assessed. METHODS: Articles in Pubmed, Scopus, and Google scholar were identified using controlled words relating to antibiotic resistance (AR) at the Hajj from January 2002 to January 2017. Eligible studies were identified by two researchers...
June 23, 2017: Travel Medicine and Infectious Disease
https://www.readbyqxmd.com/read/28652114/antibiotic-innovation-for-future-public-health-needs
#19
REVIEW
Ursula Theuretzbacher
BACKGROUND: The public health threat of antibiotic resistance has gained attention at the highest political levels globally, and recommendations on how to respond are being considered for implementation. Among the recommended responses being explored for their feasibility is the introduction of economic incentives to promote research and development (R&D) of new antibiotics. There is broad agreement that public investment should stimulate innovation and be linked to policies promoting sustainable and equitable access to antibiotics...
June 23, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28651889/a-novel-expression-vector-for-the-secretion-of-abaecin-in-bacillus-subtilis
#20
Li Li, Lan Mu, Xiaojuan Wang, Jingfeng Yu, Ruiping Hu, Zhen Li
This study aimed to describe a Bacillus subtilis expression system based on genetically modified B. subtilis. Abaecin, an antimicrobial peptide obtained from Apis mellifera, can enhance the effect of pore-forming peptides from other species on the inhibition of bacterial growth. For the exogenous expression, the abaecin gene was fused with a tobacco etch virus protease cleavage site, a promoter Pglv, and a mature beta-glucanase signal peptide. Also, a B. subtilis expression system was constructed. The recombinant abaecin gene was expressed and purified as a recombinant protein in the culture supernatant...
June 3, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
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