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https://www.readbyqxmd.com/read/28306563/antimicrobial-resistant-gram-negative-infections-in-neonates-burden-of-disease-and-challenges-in-treatment
#1
Laura Folgori, Julia Bielicki, Paul T Heath, Mike Sharland
PURPOSE OF REVIEW: This review summarizes the main challenges of antimicrobial resistance (AMR) in the neonatal population with a special focus on multidrug-resistant (MDR) Gram-negative pathogens. RECENT FINDINGS: MDR-Gram-negative bacteria are a great concern in the neonatal population, with a worldwide rise in the reported incidence and with very limited therapeutic options. Extended-spectrum β-lactamase and carbapenem-resistant Enterobacteriaceae (CRE) have been reported as responsible for neonatal ICU outbreaks...
March 16, 2017: Current Opinion in Infectious Diseases
https://www.readbyqxmd.com/read/28306363/genome-database-mining-for-the-discovery-of-novel-lantibiotics
#2
Stephanie K Sandiford
The effectiveness of lantibiotics against MDR pathogens and the progression of agents MU1140, NAI-107, NVB302 and duramycin into pre-clinical and clinical trials have highlighted their potential in the fight against bacterial resistance. The number of known lantibiotics and knowledge of their biosynthetic pathways has increased in recent years due to higher quality genomic data being delivered by next generation sequencing technologies combined with the development of specific genome mining tools, enabling the prediction of lantibiotic clusters...
March 17, 2017: Expert Opinion on Drug Discovery
https://www.readbyqxmd.com/read/28302399/elucidation-of-structural-and-functional-integration-of-a-novel-antimicrobial-peptide-from-antheraea-mylitta
#3
Suhrid R Dutta, Samiran S Gauri, Twisa Ghosh, Suman K Halder, Pradeep K DasMohapatra, Keshab C Mondal, Ananta K Ghosh
We report here the amino acid sequence of an antimicrobial peptide of Antheraea mylitta (peptide fraction II) effectively killed urinary tract associated MDR E. coli (Dutta et al., 2016), as Gly-Gly-Gly-Gly-Gly-Gly-His-Leu-Val-Ala. The physicochemical and biological properties of this peptide were evaluated by computational analysis and its isoelectric point, grand average of hydropathicity and Boman index values were found to be 6.74, 0.42 and -1.17kcal/mol, respectively. One valid model of peptide fraction II was constructed, that contains two antiparallel β sheets with a hairpin and appeared as 'U' shaped structure...
March 3, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28302397/structure-based-discovery-of-lpxc-inhibitors
#4
Jing Zhang, Audrey Chan, Blaise Lippa, Jason B Cross, Christopher Liu, Ning Yin, Jan Antoinette C Romero, Jonathan Lawrence, Ryan Heney, Prudencio Herradura, Jennifer Goss, Cynthia Clark, Cassandra Abel, Yanzhi Zhang, Katherine M Poutsiaka, Felix Epie, Mary Conrad, Azard Mahamoon, Kien Nguyen, Ajit Chavan, Edward Clark, Tong-Chuan Li, Robert K Cheng, Michael Wood, Ole A Andersen, Mark Brooks, Jason Kwong, John Barker, Ian Barrie Parr, Yugui Gu, M Dominic Ryan, Scott Coleman, Chester A Metcalf
The emergence and spread of multidrug-resistant (MDR) Gram negative bacteria presents a serious threat for public health. Novel antimicrobials that could overcome the resistance problems are urgently needed. UDP-3-O-(R-3-hydroxymyristol)-N-acetylglucosamine deacetylase (LpxC) is a cytosolic zinc-based deacetylase that catalyzes the first committed step in the biosynthesis of lipid A, which is essential for the survival of Gram-negative bacteria. Our efforts toward the discovery of novel LpxC inhibitors are presented herein...
March 6, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28299457/current-trends-of-human-infections-and-antibiotic-resistance-of-the-genus-shewanella
#5
REVIEW
K Yousfi, S Bekal, V Usongo, A Touati
Shewanella spp. are commonly known as environmental bacteria and are most frequently isolated from aquatic areas. Currently, diseases syndromes and multidrug resistance have increasingly been reported in the genus Shewanella. Some species are associated with various infections, such as skin and soft tissue infections, as well as bacteremia. Generally, these bacteria are opportunistic and mostly affect people with an impaired immune system. This genus is also a probable vehicle and progenitor of antibiotic resistance genes...
March 15, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28294992/new-roads-leading-to-old-destinations-efflux-pumps-as-targets-to-reverse-multidrug-resistance-in-bacteria
#6
REVIEW
Gabriella Spengler, Annamária Kincses, Márió Gajdács, Leonard Amaral
Multidrug resistance (MDR) has appeared in response to selective pressures resulting from the incorrect use of antibiotics and other antimicrobials. This inappropriate application and mismanagement of antibiotics have led to serious problems in the therapy of infectious diseases. Bacteria can develop resistance by various mechanisms and one of the most important factors resulting in MDR is efflux pump-mediated resistance. Because of the importance of the efflux-related multidrug resistance the development of new therapeutic approaches aiming to inhibit bacterial efflux pumps is a promising way to combat bacteria having over-expressed MDR efflux systems...
March 15, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28291943/a-new-combination-of-a-pleuromutilin-derivative-and-doxycycline-for-treatment-of-multidrug-resistant-acinetobacter-baumannii
#7
Shajila Siricilla, Katsuhiko Mitachi, Junshu Yang, Shakiba Eslamimehr, Maddie R Lemieux, Bernd Meibohm, Yinduo Ji, Michio Kurosu
Multidrug-resistant (MDR) Acinetobacter baumannii is one of the most difficult Gram-negative bacteria to treat and eradicate. In a cell-based screening of pleuromutilin derivatives against a drug sensitive A. baumannii strain, new molecules (2-4) exhibit bacteriostatic activity with 3.13 μg/mL concentration and 1 shows bactericidal activity with an MBC of 6.25 μg/mL. The pleuromutilin derivative 1 displays strong synergistic effects with doxycycline in a wide range of concentrations. A 35/1 ratio of 1 and doxycycline (1-Dox 35/1) kills drug susceptible A...
March 22, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28289407/a-novel-antimicrobial-endolysin-lyspa26-against-pseudomonas-aeruginosa
#8
Mingquan Guo, Chunyan Feng, Jie Ren, Xuran Zhuang, Yan Zhang, Yongzhang Zhu, Ke Dong, Ping He, Xiaokui Guo, Jinhong Qin
The global increase in multidrug resistant (MDR) bacteria has led to phage therapy being refocused upon. A novel endolysin, LysPA26, containing a lysozyme-like domain, was screened against Pseudomonas aeruginosa in this study. It had activity against MDR P. aeruginosa without pretreatment with an outer-membrane permeabilizer. LysPA26 could kill up to 4 log units P. aeruginosa in 30 min. In addition, temperature and pH effect assays revealed that LysPA26 had good stability over a broad range of pH and temperatures...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28289362/study-on-biofilm-formation-in-burn-wound-infection-in-a-pediatric-hospital-in-chennai-india
#9
M Ramakrishnan, S Putli Bai, M Babu
Infection is one of the major causes of death in pediatric burns in India. This work was conducted in an exclusive Children's Hospital (KKCTH) with a total of 220 beds, of which ten beds in the burn unit and two isolation beds in the 28-bed PICU are for burns patients (more than 20% TBSA burns) with sepsis. In this study, 30 burn wound swab isolates obtained from 14 pediatric burns patients (admitted to the burns ward and transferred to PICU) from November 2013 to March 2014 were investigated. Cultures were done on the first day for all patients and empirical antibiotic administration was started for those with septic burns (14 in total) with piperacillin-tazobactam and vancomycin...
December 31, 2016: Annals of Burns and Fire Disasters
https://www.readbyqxmd.com/read/28288860/epidemiology-of-multidrug-resistant-gram-negative-pathogens-isolated-from-ventilator-associated-pneumonia-in-icu-patients
#10
Richa Gupta, Abida Malik, Meher Rizvi, Moied Ahmed, Anuradha Singh
OBJECTIVES: Antibiotic resistance among Gram-negative pathogens isolated from ventilator-associated pneumonia (VAP) poses a grave threat in intensive care unit (ICU) patients. The aim of this study was to assess the prevalence of pathogens in ICU patients and their drug resistance profile. The prevalence of extended-spectrum β-lactamases (ESBLs), AmpC β-lactamases and metallo-β-lactamases (MBLs) was also assessed. METHODS: Tracheal aspirates were collected aseptically from 87 ICU patients between May 2012 and January 2014...
March 10, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28277085/detection-of-class-i-and-ii-integrons-for-the-assessment-of-antibiotic-and-multidrug-resistance-among-escherichia-coli-isolates-from-agricultural-irrigation-waters-in-bulacan-philippines
#11
Cielo Emar M Paraoan, Windell L Rivera, Pierangeli G Vital
Contaminated irrigation water may greatly affect not only the quality of produce but also the people exposed to it. In this study, agricultural irrigation waters in Bulacan, Philippines were assessed and found to be contaminated with Escherichia coli (E. coli) ranging from 0.58 to 4.51 log10 CFU/mL. A total of 79 isolates of E. coli were confirmed through polymerase chain reaction (PCR) amplifying the uidA gene and were tested for phenotypic resistance using 10 antimicrobials through the Kirby-Bauer disc diffusion method...
February 10, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/28275224/aggressive-versus-conservative-antibiotic-use-to-prevent-and-treat-ventilator-associated-pneumonia-in-patients-with-severe-traumatic-brain-injury-comparison-of-two-case-series
#12
Arturo Chieregato, Paolo Malacarne, Francesco Cocciolo, Maurizio Ravaldini, Emanuele Russo, Bruno Viaggi, Michele Giardino, Carlotta Rossi, Bruno Simini, Guido Bertolini
BACKGROUND: In patients with traumatic brain injury (TBI), ventilator-associated pneumonia (VAP) is considered a dangerous complication, prompting early aggressive antibiotic treatment and prophylaxis. While this approach increases the selection of multidrug-resistant bacteria (MDR), its clinical benefit has not been demonstrated. METHODS: One-year incidence of VAP in severe TBI patients (ICU stay >48 hours, with either Glasgow Coma Scale 8 or receiving intracranial pressure monitoring, or having undergone emergency surgery) and the prevalence of MDR among those who eventually developed it, were compared in two Italian intensive care units (ICUs) adopting different antibiotic approaches...
March 8, 2017: Minerva Anestesiologica
https://www.readbyqxmd.com/read/28273965/emergence-of-carbapenem-resistant-non-fermenting-gram-negative-bacilli-isolated-in-an-icu-of-a-tertiary-care-hospital
#13
Sonika Agarwal, Barnali Kakati, Sushant Khanduri, Shalini Gupta
INTRODUCTION: The emergence and spread of Multi-Drug Resistant (MDR) Non-Fermenting Gram-Negative Bacilli (NFGNB) in Intensive Care Units (ICU) and their genetic potential to transmit diverse antibiotic resistance regardless of their ability to ferment glucose poses a major threat in hospitals. The complex interplay of clonal spread, persistence, transmission of resistance elements and cell-cell interaction leads to the difficulty in controlling infections caused by these multi drug-resistant strains...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28273898/disinfection-of-multidrug-resistant-escherichia-coli-by-solar-photocatalysis-using-fe-doped-zno-nanoparticles
#14
Sourav Das, Sayantan Sinha, Bhaskar Das, R Jayabalan, Mrutyunjay Suar, Amrita Mishra, Ashok J Tamhankar, Cecilia Stålsby Lundborg, Suraj K Tripathy
Spread of antibiotic resistant bacteria through water, is a threat to global public health. Here, we report Fe-doped ZnO nanoparticles (Fe/ZnO NPs) based solar-photocatalytic disinfection (PCD) of multidrug resistant Escherichia coli (MDR E. coli). Fe/ZnO NPs were synthesized by chemical precipitation technique, and when used as photocatalyst for disinfection, proved to be more effective (time for complete disinfection = 90 min) than ZnO (150 min) and TiO2 (180 min). Lipid peroxidation and potassium (K(+)) ion leakage studies indicated compromisation of bacterial cell membrane and electron microscopy and live-dead staining confirmed the detrimental effects on membrane integrity...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28273820/in-vitro-activities-of-lcb-01-0648-a-novel-oxazolidinone-against-gram-positive-bacteria
#15
Sang-Hun Oh, Josep Kim, Sung-Yoon Baek, Sang-Eun Chae, Hee-Soo Park, Young-Lag Cho, Jin-Hwan Kwak
Oxazolidinones are a novel class of synthetic antibacterial agents that inhibit bacterial protein synthesis. Here, we synthesized and tested a series of oxazolidinone compounds containing cyclic amidrazone. Among these compounds, we further investigated the antibacterial activities of LCB01-0648 against drug-susceptible or resistant Gram-positive cocci in comparison with those of six reference compounds. LCB01-0648 showed the most potent antimicrobial activities against clinically isolated Gram-positive bacteria...
March 3, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28272303/effects-of-silver-nanoparticles-on-multiple-drug-resistant-strains-of-staphylococcus-aureus-and-pseudomonas-aeruginosa-from-mastitis-infected-goats-an-alternative-approach-for-antimicrobial-therapy
#16
Yu-Guo Yuan, Qiu-Ling Peng, Sangiliyandi Gurunathan
Recently, silver nanoparticles (AgNPs) have been widely used in various applications as antimicrobial agents, anticancer, diagnostics, biomarkers, cell labels, and drug delivery systems for the treatment of various diseases. Microorganisms generally acquire resistance to antibiotics through the course of antibacterial therapy. Multi-drug resistance (MDR) has become a growing problem in the treatment of infectious diseases, and the widespread use of broad-spectrum antibiotics has resulted in the development of antibiotic resistance by numerous human and animal bacterial pathogens...
March 6, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28272049/a-new-reactor-for-denitrification-and-micro-particle-removal-in-recirculated-aquaculture-systems
#17
A Boley, G Korshun, S Boley, V Jung-Schroers, M Adamek, D Steinhagen, S Richter
A 'membrane-denitrification' reactor (MDR) was developed and tested in a semi-technical recirculation aquaculture system in comparison to a double - without MDR - as reference system. The MDR consisted of a reactor with an ultrafiltration membrane unit for removal of micro-particles (e.g. sludge flocs, bacteria and parasites). Specific carrier material provided surfaces for biofilm growth in a fluidized bed reactor with ethanol as carbon source for denitrification. The continuous motion of these carriers cleaned the membrane surface...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28268024/presence-distribution-and-molecular-epidemiology-of-multi-drug-resistant-gram-negative-bacilli-from-medical-personnel-of-intensive-care-units-in-tianjin-china-2007-2015
#18
H Liu, C N Fei, Y Zhang, G W Liu, J Liu, J Dong
BACKGROUND: Multi-drug-resistant Gram-negative bacteria (MDRGNB) have become an important cause of nosocomial infection in intensive care units (ICUs). AIMS: To investigate the molecular epidemiology of MDRGNB isolated from medical personnel (MP) and non-medical personnel (NMP) at 69 ICUs in Tianjin, China. METHODS: From April 2007 to October 2015, 2636 nasal and hand swab samples from 1185 MP and 133 NMP were cultured for GNB (including MDRGNB), meticillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci (VRE)...
January 28, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/28261736/dual-antibacterial-activities-of-a-chitosan-modified-upconversion-photodynamic-therapy-system-against-drug-resistant-bacteria-in-deep-tissue
#19
Siwen Li, Sisi Cui, Deyan Yin, Qiuyun Zhu, Yuxiang Ma, Zhiyu Qian, Yueqing Gu
Photodynamic therapy (PDT) has recently been proposed as an innovative approach to combat multi-drug resistant (MDR) bacteria. To improve the penetration depth of current PDT, a core-shell upconversion nanoparticle (UCNP) based PDT system, composed of a cationic N-octyl chitosan (OC) coated UCNP loaded with the photosensitizer zinc phthalocyanine (OC-UCNP-ZnPc), was constructed to enhance the antibacterial efficacy against MDR bacteria in deep tissue. The core-shell UCNPs displayed a higher upconversion fluorescence efficiency compared to the inner UCNP core...
March 6, 2017: Nanoscale
https://www.readbyqxmd.com/read/28261184/carbonyl-cyanide-m-chlorophenylhydrazine-cccp-reverses-resistance-to-colistin-but-not-to-carbapenems-and-tigecycline-in-multidrug-resistant-enterobacteriaceae
#20
John Osei Sekyere, Daniel G Amoako
Background: Carbapenems (CAR), colistin (CST), and tigecycline (TGC) alone or in combination therapy has become the last-resort antibiotics for treating infections caused by multidrug resistant (MDR) bacteria. However, resistance to these reserve antibiotics are increasingly being reported worldwide. Hence, the quest to find other agents that will synergistically restore the efficacy of these antibiotics have increased. Methods: Sixty-three clinical Enterobacteriaceae isolates comprising of Klebsiella pneumoniae (n = 24), Enterobacter spp...
2017: Frontiers in Microbiology
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