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https://www.readbyqxmd.com/read/28303819/prevalence-and-genetic-mechanisms-of-antimicrobial-resistance-in-staphylococcus-species-a-multicentre-report-of-the-indian-council-of-medical-research-antimicrobial-resistance-surveillance-network
#1
Sunanda Rajkumar, Sujatha Sistla, Meerabai Manoharan, Madhan Sugumar, Niveditha Nagasundaram, Subhash Chandra Parija, Pallab Ray, Yamuna Devi Bakthavatchalam, Balaji Veeraraghavan, Arti Kapil, Kamini Walia, V C Ohri
PURPOSE: Routine surveillance of antimicrobial resistance (AMR) is an essential component of measures aimed to tackle the growing threat of resistant microbes in public health. This study presents a 1-year multicentre report on AMR in Staphylococcus species as part of Indian Council of Medical Research-AMR surveillance network. MATERIALS AND METHODS: Staphylococcus species was routinely collected in the nodal and regional centres of the network and antimicrobial susceptibility testing was performed against a panel of antimicrobials...
January 2017: Indian Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28291334/rapid-real-time-antimicrobial-susceptibility-testing-with-electrical-sensing-on-plastic-microchips-with-printed-electrodes
#2
Mohammadali Safavieh, Hardik Jeetendra Pandya, Maanasa Venkataraman, Prudhvi Thirumalaraju, Manoj Kumar Kanakasabapathy, Anupriya Singh, Devbalaji Prabhakar, Manjyot Kaur Chug, Hadi Shafiee
Rapid antimicrobial susceptibility testing is important for efficient and timely therapeutic decision making. Due to globally spread bacterial resistance, the efficacy of antibiotics is increasingly being impeded. Conventional antibiotic tests rely on bacterial culture, which is time-consuming and can lead to potentially inappropriate antibiotic prescription and up-front broad range of antibiotic use. There is an urgent need to develop point-of-care platform technologies to rapidly detect pathogens, identify the right antibiotics, and monitor mutations to help adjust therapy...
March 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28287735/targeted-antibiotic-delivery-selective-siderophore-conjugation-with-daptomycin-confers-potent-activity-against-multi-drug-resistant-acinetobacter-baumannii-both-in-vitro-and-in-vivo
#3
Manuka Ghosh, Patricia A Miller, Ute Möllmann, William D Claypool, Valerie A Schroeder, William R Wolter, Mark Suckow, Honglin Yu, Shuang Li, Weiqiang Huang, Jaroslav Zajicek, Marvin J Miller
In order to address the dire need for new antibiotics to treat specific strains of drug resistant Gram-negative bacterial infections, a mixed ligand analog of the natural Acinetobacter baumannii selective siderophore, fimsbactin, was coupled to daptomycin, a Gram-positive only antibiotic. The resulting conjugate, 11, has potent activity against multi-drug resistant strains of A. baumannii, both in vitro and in vivo. The study also indicates that conjugation of siderophores to "drugs" that are much larger than the siderophore (iron transport agent) itself facilitates active uptake that circumvents the normal permeability problems in Gram-negative bacteria...
March 13, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28273381/role-of-combination-antimicrobial-therapy-for-vancomycin-resistant-enterococcus-faecium-infections-review-of-the-current-evidence
#4
Juwon Yim, Jordan R Smith, Michael J Rybak
Enterococcus species are the second most common cause of nosocomial infections in the United States and are particularly concerning in critically ill patients with preexisting comorbid conditions. Rising resistance to antimicrobials that were historically used as front-line agents for treatment of enterococcal infections, such as ampicillin, vancomycin, and aminoglycosides, further complicates the treatment of these infections. Of particular concern are Enterococcus faecium strains that are associated with the highest rate of vancomycin resistance...
March 8, 2017: Pharmacotherapy
https://www.readbyqxmd.com/read/28264856/effect-of-continuous-and-sequential-therapy-among-veterans-receiving-daptomycin-or-linezolid-for-vancomycin-resistant-enterococcus-faecium-bacteremia
#5
Nicholas S Britt, Emily M Potter, Nimish Patel, Molly E Steed
Vancomycin-resistant Enterococcus faecium bloodstream infections (VREF-BSI) cause significant mortality, highlighting the need to optimize treatment. We compared the effectiveness and safety of daptomycin (DAP) and linezolid (LZD) as continuous or sequential therapy for VREF-BSI in a national, retrospective, propensity score (PS) matched cohort study of hospitalized Veterans Affairs patients (2004-2014). We compared clinical outcomes and adverse events among patients treated with continuous LZD, continuous DAP, or sequential LZD followed by DAP (LZD-DAP)...
March 6, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28264848/impact-of-high-level-daptomycin-resistance-in-streptococcus-mitis-group-on-virulence-and-survivability-during-daptomycin-treatment-in-experimental-infective-endocarditis
#6
C Garcia-de-la-Maria, Y Q Xiong, J M Pericas, Y Armero, A Moreno, N N Mishra, M J Rybak, T T Tran, C A Arias, P M Sullam, A S Bayer, J M Miro
Streptococcus mitis group is the most common cause of infective endocarditis among the viridans group streptococci. It has a propensity to be β-lactam-resistant, as well as to rapidly develop high-level and durable resistance to daptomycin. We compared a parental, daptomycin-susceptible (DAP-S) S. mitis/oralis strain and its daptomycin-resistant (DAP-R) variant in an experimental endocarditis model in terms of: i) their relative fitness in multiple target organs in this model (vegetations; kidneys; spleen) when animals were challenged either individually vs...
March 6, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28260939/infectious-anastomotic-pseudoaneurysm-complicating-renal-allograft-case-report-and-review-of-literature
#7
Marvin Mt Chung, Yiu Che Chan, Yuk Law, Stephen Wk Cheng
Infectious anastomotic pseudoaneurysm complicating renal transplant is rare, but probably under-reported with <30 cases worldwide. We report a 45-year-old man with hypertension, diabetes mellitus and end stage renal failure, who had a renal transplant anastomosed to the right external iliac artery and vein. Postoperatively, he made a slow recovery with malaise and persistent vague right iliac fossa discomfort. Ultrasound scan 1 month postoperatively showed perinephric collection, and fluid culture grew Enterococcus faecium and Pseudomonas aeruginosa...
2017: International Journal of Nephrology and Renovascular Disease
https://www.readbyqxmd.com/read/28257904/in-vitro-activity-of-ceftaroline-and-comparator-agents-against-gram-positive-and-gram-negative-clinical-isolates-from-cancer-patients
#8
Kenneth V I Rolston, Mohamed A Jamal, Lior Nesher, Samuel A Shelburne, Issam Raad, Randall A Prince
Bacterial infections are common in cancer patients. Ceftaroline (CFT) is a broad-spectrum cephalosporin with activity against most Gram-positive organisms (GPOs) and many Gram-negative organisms. In this study, the in vitro activity of CFT was compared with vancomycin (VAN), daptomycin (DAP), linezolid (LZD), trimethoprim/sulphamethoxazole (SXT) and tigecycline (TIG) against bacteria (predominantly blood culture isolates) isolated from cancer patients in 2014 and 2015. CFT was active against methicillin-susceptible Staphylococcus aureus (MSSA), methicillin-resistant S...
February 28, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28257884/development-of-advanced-biantibiotic-loaded-bone-cement-spacers-for-arthroplasty-associated-infections
#9
F J Parra-Ruíz, A González-Gómez, M Fernández-Gutiérrez, J Parra, J García-García, G Azuara, B De la Torre, J Buján, B Ibarra, L Duocastella-Codina, M Molina-Crisol, B Vázquez-Lasa, J San Román
The incidence increase of infections in patients with hip or knee implants with resistant pathogens (mainly some S. coagulase-negative and gram positive bacteria) demands advanced antibiotic loaded formulations. In this paper, we report the design of new biantibiotic acrylic bone cements for in situ delivery. They include a last generation antibiotic (daptomycin or linezolid) in combination with vancomycin and are performed based on a novel modification of the Palacos R(®) acrylic bone cement, which is based on two components, a liquid (methyl methacrylate) and a solid (polymeric phase)...
February 28, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28232309/ceftaroline-resistant-daptomycin-tolerant-and-heterogeneous-vancomycin-intermediate-methicillin-resistant-staphylococcus-aureus-causing-infective-endocarditis
#10
Masayuki Nigo, Lorena Diaz, Lina P Carvajal, Truc T Tran, Rafael Rios, Diana Panesso, Juan D Garavito, William R Miller, Audrey Wanger, George Weinstock, Jose M Munita, Cesar A Arias, Henry F Chambers
We report a case of infective endocarditis (IE) caused by ceftaroline-resistant, daptomycin-tolerant, and heterogeneous vancomycin-intermediate methicillin-resistant S. aureus (MRSA). Resistance to ceftaroline emerged in the absence of drug exposure, and the E447K substitution in the active site of PBP2a previously associated with ceftaroline resistance was identified. Additionally, we present evidence of patient-to-patient transmission of the strain within the same unit. This case illustrates the difficulties in treating MRSA IE in the setting of a multidrug-resistant phenotype...
March 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28225264/fatty-acid-comprising-lysine-conjugates-anti-mrsa-agents-that-display-in-vivo-efficacy-by-disrupting-biofilms-with-no-resistance-development
#11
Mohini Mohan Konai, Jayanta Haldar
Methicillin-resistant Staphylococcus aureus (MRSA) have developed resistance to antibiotics of last resort such as vancomycin, linezolid and daptomycin. Additionally, their biofilm forming capability has set an alarming situation in the treatment of bacterial infections. Herein we report the potency of fatty acid comprising lysine conjugates as novel anti-MRSA agents, which were not only capable of killing growing planktonic MRSA at low concentration (MIC = 3.1-6.3 µg/mL), but also displayed potent activity against non-dividing stationary phase cells...
February 22, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28223392/streptococcus-mitis-and-s-oralis-lack-a-requirement-for-cdsa-the-enzyme-required-for-synthesis-of-major-membrane-phospholipids-in-bacteria
#12
Hannah M Adams, Luke R Joyce, Ziqiang Guan, Ronda L Akins, Kelli L Palmer
Synthesis and integrity of the cytoplasmic membrane is fundamental to cellular life. Experimental evolution studies have hinted at unique physiology in the Gram-positive bacteria Streptococcus mitis and S. oralis These organisms commonly cause bacteremia and infectious endocarditis (IE) but are rarely investigated in mechanistic studies of physiology and evolution. Unlike other Gram-positive pathogens, high-level (MIC ≥ 256 μg/mL) daptomycin resistance rapidly emerges in S. mitis and S. oralis after a single drug exposure...
February 21, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28208915/an-unusual-occurrence-of-methicillin-resistant-staphylococcal-endocarditis-with-vancomycin-creep-phenomenon-a-therapeutic-challenge
#13
S Sneha, Shanthan Venishetty, Shubha Seshadri, M Sudhakar Rao, Chiranjay Mukhopadhyay
Infective endocarditis by Methicillin Resistant Staphylococcus aureus (MRSA) bacteraemia is a common association and carries a high mortality. However, rising Minimum Inhibitory Concentrations (MICs) for vancomycin amongst MRSA strains is an emerging threat which carries poor prognosis and higher mortality. Here, we report a case of 41-year-old young non-addict gentleman presenting with fever of 3 days duration following recovery from an acute kidney injury necessitating haemodialysis. Systemic examination revealed signs of mitral regurgitation and left sided cerebellar signs...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28204495/early-in-vitro-development-of-daptomycin-non-susceptibility-in-high-level-aminoglycoside-resistant-enterococcus-faecalis-predicts-the-efficacy-of-the-combination-of-high-dose-daptomycin-plus-ampicillin-in-an-in-vivo-model-of-experimental-endocarditis
#14
J M Pericàs, C García-de-la-Mària, M Brunet, Y Armero, J García-González, G Casals, M Almela, E Quintana, C Falces, S Ninot, D Fuster, J Llopis, F Marco, A Moreno, J M Miró
No abstract text is available yet for this article.
February 14, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28202770/daptomycin-for-complicated-skin-infections-a-randomized-trial
#15
John Bradley, Chad Glasser, Hernando Patino, Sandra R Arnold, Antonio Arrieta, Blaise Congeni, Robert S Daum, Tsoline Kojaoghlanian, Minjung Yoon, Diane Anastasiou, Dominik J Wolf, Paula Bokesch
BACKGROUND: Complicated skin and skin structure infections (cSSSI) are common in children. Due to safety and resistance issues with recommended agents, new treatment options would be advantageous. METHODS: Multicenter, evaluator-blinded clinical trial. Patients 1 to 17 years old with cSSSI caused by Gram-positive pathogens were randomized 2:1 to intravenous daptomycin or standard-of-care (SOC) treatment for ≤14 days. Daptomycin was administered once daily with dosing by patient age: 12 to 17 years, 5 mg/kg; 7 to 11 years, 7 mg/kg; 2 to 6 years, 9 mg/kg; 12 to 23 months, 10 mg/kg...
March 2017: Pediatrics
https://www.readbyqxmd.com/read/28198150/the-effectiveness-of-negative-pressure-therapy-on-infected-wounds-preliminary-results
#16
Federico Lo Torto, Marco Ruggiero, Paola Parisi, Zachary Borab, Manuel Sergi, Bruno Carlesimo
Vacuum-assisted closure (VAC) therapy is a sophisticated system that maintains a closed, humid, sterile and isolated environment. Wound infection is considered a relative contraindication. The objective of this study is to extend the indications for VAC therapy to include infected wounds by demonstrating its ability to increase the antibiotic concentration in the damaged and infected tissues. Patients who presented with ulcers infected with daptomycin-sensitive bacteria were eligible to be enrolled in this prospective study...
February 15, 2017: International Wound Journal
https://www.readbyqxmd.com/read/28188831/lipoteichoic-acid-synthesis-inhibition-in-combination-with-antibiotics-abrogates-growth-of-multidrug-resistant-enterococcus-faecium
#17
Fernanda L Paganelli, Tim van de Kamer, Ellen C Brouwer, Helen L Leavis, Neil Woodford, Marc J M Bonten, Rob J L Willems, Antoni P A Hendrickx
Enterococcus faecium is a multidrug-resistant (MDR) nosocomial pathogen causing significant morbidity in debilitated patients. New antimicrobials are needed to treat antibiotic-resistant E. faecium infections in hospitalised patients. E. faecium incorporates lipoteichoic acid (LTA) (1,3-polyglycerol-phosphate linked to glycolipid) in its cell wall. The small-molecule inhibitor 1771 [2-oxo-2-(5-phenyl-1,3,4-oxadiazol-2-ylamino)ethyl 2-naphtho[2,1-b]furan-1-ylacetate] specifically blocks the activity of Staphylococcus aureus LtaS synthase, which polymerises 1,3-glycerolphosphate into LTA polymers...
March 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28187530/structural-and-dynamic-characterization-of-a-freestanding-acyl-carrier-protein-involved-in-the-biosynthesis-of-cyclic-lipopeptide-antibiotics
#18
Subrata Paul, Hiroaki Ishida, Leonard T Nguyen, Zhihong Liu, Hans J Vogel
Friulimicin is a cyclic lipodecapeptide antibiotic that is produced by Actinoplanes friuliensis. Like the related lipopeptide drug daptomycin, the peptide skeleton of friulimicin is synthesized by a large multienzyme Nonribosomal Peptide Synthetase (NRPS) system. The LipD protein plays a major role in the acylation reaction of friulimicin. The attachment of the fatty acid group promotes its antibiotic activity. Phylogenetic analysis reveals that LipD is most closely related to other freestanding Acyl Carrier Proteins (ACPs), for which the genes are located near to NRPS gene clusters...
February 10, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28168121/effects-of-rhodomyrtone-on-gram-positive-bacterial-tubulin-homologue-ftsz
#19
Dennapa Saeloh, Michaela Wenzel, Thanyada Rungrotmongkol, Leendert Willem Hamoen, Varomyalin Tipmanee, Supayang Piyawan Voravuthikunchai
Rhodomyrtone, a natural antimicrobial compound, displays potent activity against many Gram-positive pathogenic bacteria, comparable to last-defence antibiotics including vancomycin and daptomycin. Our previous studies pointed towards effects of rhodomyrtone on the bacterial membrane and cell wall. In addition, a recent molecular docking study suggested that the compound could competitively bind to the main bacterial cell division protein FtsZ. In this study, we applied a computational approach (in silico), in vitro, and in vivo experiments to investigate molecular interactions of rhodomyrtone with FtsZ...
2017: PeerJ
https://www.readbyqxmd.com/read/28166207/structure-and-specificity-of-a-permissive-bacterial-c-prenyltransferase
#20
Sherif I Elshahawi, Hongnan Cao, Khaled A Shaaban, Larissa V Ponomareva, Thangaiah Subramanian, Mark L Farman, H Peter Spielmann, George N Phillips, Jon S Thorson, Shanteri Singh
This study highlights the biochemical and structural characterization of the L-tryptophan C6 C-prenyltransferase (C-PT) PriB from Streptomyces sp. RM-5-8. PriB was found to be uniquely permissive to a diverse array of prenyl donors and acceptors including daptomycin. Two additional PTs also produced novel prenylated daptomycins with improved antibacterial activities over the parent drug.
February 6, 2017: Nature Chemical Biology
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