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linezolid resistance

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https://www.readbyqxmd.com/read/28090280/in-vitro-activity-of-linezolid-in-combination-with-photodynamic-inactivation-against-staphylococcus-aureus-biofilms
#1
Nasim Kashef, Mahboobeh Akbarizare, Mohammad Reza Razzaghi
BACKGROUND: Biofilm infections are a major challenge in medical practice. Bacteria that live in a biofilm phenotype are more resistant to both antimicrobial therapy and host immune responses compared to their planktonic counterparts. So, there is need for new therapeutic strategies to combat these infections. A promising approach [known as Photodynamic Inactivation (PDI)] to kill bacteria growing as biofilms uses light in combination with a photosensitizer to induce a phototoxic reaction which produces reactive oxygen species that can destroy lipids and proteins causing cell death...
January 2017: Avicenna Journal of Medical Biotechnology
https://www.readbyqxmd.com/read/28073970/estimated-generic-prices-for-novel-treatments-for-drug-resistant-tuberculosis
#2
Dzintars Gotham, Joseph Fortunak, Anton Pozniak, Saye Khoo, Graham Cooke, Frederick E Nytko, Andrew Hill
BACKGROUND: The estimated worldwide annual incidence of MDR-TB is 480 000, representing 5% of TB incidence, but 20% of mortality. Multiple drugs have recently been developed or repurposed for the treatment of MDR-TB. Currently, treatment for MDR-TB costs thousands of dollars per course. OBJECTIVES: To estimate generic prices for novel TB drugs that would be achievable given large-scale competitive manufacture. METHODS: Prices for linezolid, moxifloxacin and clofazimine were estimated based on per-kilogram prices of the active pharmaceutical ingredient (API)...
January 10, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28073963/in-vitro-activity-of-daptomycin-combined-with-dalbavancin-and-linezolid-and-dalbavancin-with-linezolid-against-mrsa-strains
#3
Gulseren Aktas, Sengul Derbentli
OBJECTIVES: Combination therapies have a distinct advantage over monotherapies in terms of their broad spectrum, synergistic effect and prevention of the emergence of drug resistance. In the present study, the in vitro antibacterial activity of daptomycin combinations with linezolid and dalbavancin, and dalbavancin with linezolid were evaluated against 30 clinical MRSA strains. METHODS: The MICs of all antibiotics were determined using microbroth dilution as described by the CLSI...
September 28, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28070047/-clinical-analysis-for-patients-with-continuous-ambulatory-peritoneal-dialysis-associated-peritonitis
#4
Jian Liu, Xun Huang, Yao Liu, Hui Xu, Rui'e Gong, Chunhui Li
To analyze the clinical characteristics of continuous ambulatory peritoneal dialysis (CAPD) associated peritonitis in the tertiary hospitals and to discuss the preventive and therapeutic strategy.
 Methods: The clinical characteristics, pathogens, resistance and outcomes of 126 CAPD associated peritonitis in 104 patients from Jan, 2013 to June, 2016, were retrospectively analyzed.
 Results: Among the patients, the incidence rates of abdominal pain, fever, diarrhea and emesis were 104 (82.54%), 56 (44.44%), 49 (38...
December 28, 2016: Zhong Nan da Xue Xue Bao. Yi Xue Ban, Journal of Central South University. Medical Sciences
https://www.readbyqxmd.com/read/28061827/systematic-review-and-network-meta-analysis-of-tedizolid-for-the-treatment-of-acute-bacterial-skin-and-skin-structure-infections-caused-by-mrsa
#5
Rachael McCool, Ian M Gould, Jacqui Eales, Teresa Barata, Mick Arber, Kelly Fleetwood, Julie Glanville, Teresa L Kauf
BACKGROUND: Tedizolid, the active moiety of tedizolid phosphate, is approved in the United States, the European Union, Canada and a number of other countries for the treatment of acute bacterial skin and skin structure infections (ABSSSI) caused by certain susceptible bacteria, including methicillin-resistant Staphylococcus aureus (MRSA). This network meta-analysis (NMA) evaluates the comparative effectiveness of tedizolid and other antibacterials indicated for the treatment of ABSSSI caused by MRSA...
January 7, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28053508/critical-role-of-tedizolid-in-the-treatment-of-acute-bacterial-skin-and-skin-structure-infections
#6
REVIEW
Olivia Ferrández, Olatz Urbina, Santiago Grau
Tedizolid phosphate has high activity against the Gram-positive microorganisms mainly involved in acute bacterial skin and skin structure infections, such as strains of Staphylococcus aureus (including methicillin-resistant S. aureus strains and methicillin-sensitive S. aureus strains), Streptococcus pyogenes, Streptococcus agalactiae, the Streptococcus anginosus group, and Enterococcus faecalis, including those with some mechanism of resistance limiting the use of linezolid. The area under the curve for time 0-24 hours/minimum inhibitory concentration (MIC) pharmacodynamic ratio has shown the best correlation with the efficacy of tedizolid, versus the time above MIC ratio and the maximum drug concentration/minimum inhibitory concentration ratio...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28049171/group-5-drugs-for-multidrug-resistant-tuberculosis-individual-patient-data-meta-analysis
#7
Greg J Fox, Andrea Benedetti, Helen Cox, Won-Jung Koh, Piret Viiklepp, Shama Ahuja, Geoffrey Pasvol, Dick Menzies
The role of so-called "group 5" second-line drugs as a part of antibiotic therapy for multidrug-resistant tuberculosis (MDR-TB) is widely debated. We performed an individual patient data meta-analysis to evaluate the effectiveness of several group 5 drugs including amoxicillin/clavulanic acid, thioacetazone, the macrolide antibiotics, linezolid, clofazimine and terizidone for treatment of patients with MDR-TB.Detailed individual patient data were obtained from 31 published cohort studies of MDR-TB therapy. Pooled treatment outcomes for each group 5 drug were calculated using a random effects meta-analysis...
January 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/28049149/rela-mutant-enterococcus-faecium-with-multiantibiotic-tolerance-arising-in-an-immunocompromised-host
#8
Erin S Honsa, Vaughn S Cooper, Mohammed N Mhaissen, Matthew Frank, Jessica Shaker, Amy Iverson, Jeffrey Rubnitz, Randall T Hayden, Richard E Lee, Charles O Rock, Elaine I Tuomanen, Joshua Wolf, Jason W Rosch
: Serious bacterial infections in immunocompromised patients require highly effective antibacterial therapy for cure, and thus, this setting may reveal novel mechanisms by which bacteria circumvent antibiotics in the absence of immune pressure. Here, an infant with leukemia developed vancomycin-resistant Enterococcus faecium (VRE) bacteremia that persisted for 26 days despite appropriate antibiotic therapy. Sequencing of 22 consecutive VRE isolates identified the emergence of a single missense mutation (L152F) in relA, which constitutively activated the stringent response, resulting in elevated baseline levels of the alarmone guanosine tetraphosphate (ppGpp)...
January 3, 2017: MBio
https://www.readbyqxmd.com/read/28043797/cadiolides-j-m-antibacterial-polyphenyl-butenolides-from-the-korean-tunicate-pseudodistoma-antinboja
#9
Weihong Wang, Hiyoung Kim, Rahul S Patil, Awadut G Giri, Dong Hwan Won, Dongyup Hahn, Youjung Sung, Jusung Lee, Hyukjae Choi, Sang-Jip Nam, Heonjoong Kang
Activity-guided fractionations of the tunicate Pseudodistoma antinboja yielded four new compounds of the cadiolide class (cadiolides J-M, 1, 3-5) along with a known one (cadiolide H, 2). The structures were defined by spectroscopic methods including X-ray crystallographic analysis. These compounds were evaluated for their antibacterial activity and exhibited potent antibacterial activity against all of the drug resistant strains tested with MICs comparable to those of marketed drugs such as vancomycin and linezolid...
December 7, 2016: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28043603/individualized-treatment-of-multidrug-resistant-tuberculosis-using-therapeutic-drug-monitoring
#10
Mathieu S Bolhuis, Onno W Akkerman, Marieke G G Sturkenboom, Wiel C M de Lange, Tjip S van der Werf, Jan-Willem C Alffenaar
OBJECTIVE/BACKGROUND: Globally, approximately 50% of patients with multidrug-resistant tuberculosis (MDR-TB) experience treatment failure. MDR-TB treatment is hindered by adverse events, toxicity of the second-line anti-TB drugs, logistics and costs, especially in low-income countries, and problems with medication adherence. Pharmacokinetic variability is also attributed as one of the reasons contributing to treatment failure. In our reference Tuberculosis Center Beatrixoord (University Medical Center Groningen, Groningen, The Netherlands), we strive to individualize treatment of all MDR-TB patients based on drug-susceptibility testing using minimal inhibitory concentrations and pharmacokinetic parameters...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28031673/conservative-treatment-of-an-infected-aortic-graft-with-antibiotic-irrigation
#11
M Akhtar, L Meecham, R Birkett, A D P Pherwani, J F Fairhead
Conservative management of an aortic graft infection is defined as "the nonresectional treatment of an aortic graft that has an established infection." Incidence of aortic graft infections is 0.5 to 5% and the estimated mortality rate from aortic graft infections ranges from 8 to 27%. We present the case of a 73-year-old male patient with an infected abdominal aortic graft following an emergency ruptured abdominal aortic aneurysm repair. Postemergency repair, he developed ischemic colitis with sigmoid colon perforation leading to fecal peritonitis and secondary sepsis...
December 2016: International Journal of Angiology: Official Publication of the International College of Angiology, Inc
https://www.readbyqxmd.com/read/28004323/rapid-mrsa-pcr-on-respiratory-specimens-from-ventilated-patients-with-suspected-pneumonia-a-tool-to-facilitate-antimicrobial-stewardship
#12
S E Trevino, M A Pence, J Marschall, M H Kollef, H M Babcock, C-A D Burnham
Methicillin-resistant Staphylococcus aureus (MRSA) is an important cause of pneumonia in ventilated patients. Our objective was to evaluate the GeneXpert MRSA/SA SSTI Assay (Xpert MRSA/SA) (Cepheid, Sunnyvale, CA) for use in lower respiratory tract (LRT) specimens for rapid MRSA detection and to determine the potentially saved antibiotic-days if a culture-based identification method was replaced by this assay. Remnant LRT samples from ventilated patients submitted to the microbiology laboratory for routine culture were tested using conventional culture and Xpert MRSA/SA...
December 21, 2016: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28003422/maldi-tof-for-combined-species-identification-and-drug-sensitivity-testing-in-mycobacteria
#13
Pieter-Jan Ceyssens, Karine Soetaert, Markus Timke, An Van den Bossche, Katrin Sparbier, Koen De Cremer, Markus Kostrzewa, Marijke Hendrickx, Vanessa Mathys
Species identification and drug susceptibility testing (DST) of mycobacteria is an important yet complex process, traditionally reserved for reference laboratories. Recent technical improvements in MALDI-TOF MS started to facilitate routine mycobacterial identifications in clinical laboratories. In this paper, we investigate the possibility to perform phenotypic MALDI-based DST in mycobacteriology, using the recently described MALDI Biotyper antibiotic susceptibility test rapid assay (MBT-ASTRA™). We randomly selected 72 clinical M...
December 21, 2016: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/27999068/linezolid-a-promising-option-in-the-treatment-of-gram-positives
#14
Abed Zahedi Bialvaei, Mohammad Rahbar, Mehdi Yousefi, Mohammad Asgharzadeh, Hossein Samadi Kafil
Linezolid, an oxazolidinone antimicrobial agent that acts by inhibiting protein synthesis in a unique fashion, is used in the treatment of community-acquired pneumonia, skin and soft-tissue infections and other infections caused by Gram-positive bacteria including VRE and methicillin-resistant staphylococci. Currently, linezolid resistance among these pathogens remains low, commonly <1.0%, although the prevalence of antibiotic resistance is increasing in many countries. Therefore, the development of resistance by clinical isolates should prompt increased attention of clinical laboratories to routinely perform linezolid susceptibility testing for this important agent and should be taken into account when considering its therapeutic use...
December 20, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27999045/emergence-and-dissemination-of-a-linezolid-resistant-staphylococcus-capitis-clone-in-europe
#15
M Butin, P Martins-Simões, B Pichon, D Leyssene, S Bordes-Couecou, H Meugnier, C Rouard, N Lemaitre, F Schramm, A Kearns, I Spiliopoulou, H-L Hyyryläinen, O Dumitrescu, F Vandenesch, C Dupieux, F Laurent
OBJECTIVES: We investigated the epidemiological, clinical, microbiological and genetic characteristics of linezolid-resistant (LZR) Staphylococcus capitis isolates from French ICUs, and compared them with LZR S. capitis isolates from other European countries. METHODS: All LZR isolates were subjected to antimicrobial susceptibility testing (AST) and the presence of cfr and optrA genes as well as mutations in the 23S rRNA and ribosomal proteins were investigated using specific PCR with sequencing...
December 20, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27999039/detection-of-linezolid-resistance-due-to-the-optra-gene-in-enterococcus-faecalis-from-poultry-meat-from-the-american-continent-colombia
#16
L M Cavaco, J F Bernal, E Zankari, M Léon, R S Hendriksen, E Perez-Gutierrez, F M Aarestrup, P Donado-Godoy
BACKGROUND: Three Enterococcus isolates obtained from retail chicken collected in 2010-11 as part of the Colombian Integrated Program for Antimicrobial Resistance Surveillance (COIPARS) showed reduced susceptibility towards linezolid (MIC 8 mg/L). OBJECTIVES: This study aimed at characterizing the isolates resistant to linezolid and detecting the resistance mechanism. METHODS: Strains were analysed in 2011-12 without successful detection of the resistance mechanism...
December 20, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27999029/epidemiology-and-susceptibility-to-antimicrobial-agents-of-the-main-nocardia-species-in-spain
#17
Sylvia Valdezate, Noelia Garrido, Gema Carrasco, María J Medina-Pascual, Pilar Villalón, Ana M Navarro, Juan A Saéz-Nieto
OBJECTIVES: The aims of this study were to explore the clinical distribution, by species, of the genus Nocardia and to assess the antimicrobial susceptibilities of the 10 most prevalent species identified in Spain. METHODS: Over a 10 year period (2005-14), 1119 Nocardia strains were molecularly identified and subjected to the Etest. The distribution and resistance trends over the sub-periods 2005-09 and 2010-14 were also examined. RESULTS: Of the strains examined, 82...
December 20, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27993854/activity-of-omadacycline-and-comparator-agents-when-tested-against-staphylococcus-aureus-from-a-surveillance-program-conducted-in-north-america-and-europe
#18
Michael A Pfaller, Paul R Rhomberg, Michael D Huband, Robert K Flamm
Omadacycline is a new broad spectrum aminomethylcycline in late stage clinical development for acute bacterial skin and skin structure infections (ABSSSI) and community-acquired pneumonia (CABP) as a once-daily formulation taken orally or intravenously. In this study, omadacycline and comparator agents were tested against 502 isolates of Staphylococcus aureus selected from a 2014 global surveillance program and compared to the results for 7,740 isolates from a 2010 surveillance program. For the 2014 isolates, testing was completed on 252 isolates from Europe (EU) and 250 isolates from North America (NA)...
December 19, 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27993853/in-vitro-activities-of-mcb3681-and-8-comparators-against-clostridium-difficile-isolates-with-known-ribotypes-and-diverse-geographical-spread
#19
J Freeman, S Pilling, J Vernon, M H Wilcox
Treatments for Clostridium difficile infection remain limited, despite the introduction of fidaxomicin, and development of new agents is necessary.We determined the in vitro susceptibilities of 199 prevalent or emerging Clostridium difficile PCR ribotypes to MCB3681, a novel investigational quinolonyl-oxazolidinone, and 8 comparators (metronidazole, vancomycin, fidaxomicin, moxifloxacin, ciprofloxacin, clindamycin, tigecycline and linezolid).MCB3681 showed good activity against C. difficile with no evidence of MCB3681 resistance in isolates showing either or both moxifloxacin and linezolid resistance...
December 19, 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27987523/culture-methods-impact-recovery-of-antibiotic-resistant-enterococci-including-enterococcus-cecorum-from-pre-and-post-harvest-chicken
#20
M M Suyemoto, Hjb Barnes, L B Borst
Pathogenic strains of Enterococcus cecorum (EC) expressing multidrug resistance have emerged. In National Antimicrobial Resistance Monitoring System (NARMS) data, EC is rarely recovered from chickens. Two NARMS methodologies (FDA, USDA) were compared with standard culture (SC) techniques for recovery of EC. NARMS methods failed to detect EC in 58 cecal samples, 20 chicken breast or 6 whole broiler samples. EC was recovered from 1 of 38 (2.6%) and 2 of 38 (5.2%) pre-harvest spinal lesions (USDA and FDA method respectively)...
December 17, 2016: Letters in Applied Microbiology
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