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Antibiotics resistence

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https://www.readbyqxmd.com/read/29029217/high-levels-of-susceptibility-to-new-and-older-antibiotics-in-neisseria-gonorrhoeae-isolates-from-saskatchewan-2003-15-time-to-consider-point-of-care-or-molecular-testing-for-precision-treatment
#1
Sidharath D Thakur, Paul N Levett, Gregory B Horsman, Jo-Anne R Dillon
Objectives: The antimicrobial susceptibility of Neisseria gonorrhoeae isolates from Saskatchewan was determined retrospectively (2003-15) to ascertain temporal trends to both current and older antimicrobials used for treatment. Method: The agar dilution method was used to test the antimicrobial susceptibilities of 685 isolates to seven antibiotics. Results: Over the period, only three (0.4%) gonococcal isolates had reduced susceptibility to cefixime and/or ceftriaxone...
September 27, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29029194/envelope-proteome-changes-driven-by-rama-overproduction-in-klebsiella-pneumoniae-that-enhance-acquired-%C3%AE-lactam-resistance
#2
Juan-Carlos Jiménez-Castellanos, Wan Ahmad Kamil Wan Nur Ismah, Yuiko Takebayashi, Jacqueline Findlay, Thamarai Schneiders, Kate J Heesom, Matthew B Avison
Objectives: In Klebsiella pneumoniae, overproduction of RamA results in reduced envelope permeability and reduced antimicrobial susceptibility but clinically relevant resistance is rarely observed. Here we have tested whether RamA overproduction can enhance acquired β-lactam resistance mechanisms in K. pneumoniae and have defined the envelope protein abundance changes upon RamA overproduction during growth in low and high osmolarity media. Methods: Envelope permeability was estimated using a fluorescent dye accumulation assay...
October 6, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29029114/carbapenem-resistant-citrobacter-spp-isolated-in-spain-from-2013-to-2015-produced-a-variety-of-carbapenemases-including-vim-1-oxa-48-kpc-2-ndm-1-and-vim-2
#3
David M Arana, Adriana Ortega, Eva González-Barberá, Noelia Lara, Verónica Bautista, Dolores Gómez-Ruíz, David Sáez, Sara Fernández-Romero, Belén Aracil, María Pérez-Vázquez, José Campos, Jesús Oteo
Objectives: There is little information about carbapenemase-producing (CP) Citrobacter spp. We studied the molecular epidemiology and microbiological features of CP Citrobacter spp. isolates collected in Spain (2013-15). Methods: In total, 119 isolates suspected of being CP by the EUCAST screening cut-off values were analysed. Carbapenemases and ESBLs were characterized using PCR and sequencing. The genetic relationship among Citrobacter freundii isolates was studied by PFGE...
September 27, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29029083/unravelling-the-genome-of-a-pseudomonas-aeruginosa-isolate-belonging-to-the-high-risk-clone-st235-reveals-an-integrative-conjugative-element-housing-a-blages-6-carbapenemase
#4
João Botelho, Filipa Grosso, Luísa Peixe
Objectives: In Pseudomonas aeruginosa, the blaGES-6 carbapenemase gene was previously associated with an In1076 class I integron. Here, we conducted a genome-based analysis and explored the genetic platform associated with the mobility of this gene. Methods: WGS of a blaGES-6-harbouring P. aeruginosa isolate (FFUP_PS_690) was performed with Illumina HiSeq, de novo assembly was performed using SPAdes and subsequent bioinformatic analysis was performed concerning antibiotic resistance genes, virulence features and mobile genetic elements...
October 4, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29029072/detection-of-optra-in-the-african-continent-tunisia-within-a-mosaic-enterococcus-faecalis-plasmid-from-urban-wastewaters
#5
Ana R Freitas, Houyem Elghaieb, Ricardo León-Sampedro, Mohamed Salah Abbassi, Carla Novais, Teresa M Coque, Abdennaceur Hassen, Luisa Peixe
Objectives: Oxazolidinone resistance is a serious limitation in the treatment of MDR Enterococcus infections. Plasmid-mediated oxazolidinone resistance has been strongly linked to animals where the use of phenicols might co-select resistance to both antibiotic families. Our goal was to assess the diversity of genes conferring phenicol/oxazolidinone resistance among diverse enterococci and to characterize the optrA genetic environment. Methods: Chloramphenicol-resistant isolates (>16 mg/L, n = 245) from different sources (hospitals/healthy humans/wastewaters/animals) in Portugal, Angola and Tunisia (1996-2016) were selected...
September 26, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29029067/pharmacodynamics-of-fosfomycin-against-esbl-and-or-carbapenemase-producing-enterobacteriaceae
#6
Fiona Fransen, Kelly Hermans, Maria J B Melchers, Claudia C M Lagarde, Joseph Meletiadis, Johan W Mouton
Background: The increase in antibiotic resistance in Gram-negative bacteria and the limited therapeutic options due to the shortage of new antibiotics have increased the interest of the 'old' antibiotic fosfomycin in the treatment of infections. However, there are contradictory reports on the pharmacodynamics of and emergence of resistance to fosfomycin. Methods: Time-kill assays were performed with 11 ESBL-positive and 3 ESBL-negative strains, exposing the bacteria to 2-fold static concentrations from 0...
October 4, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29029033/trial-evaluating-ambulatory-therapy-of-travelers-diarrhea-treat-td-study-a-randomized-controlled-trial-comparing-3-single-dose-antibiotic-regimens-with-loperamide
#7
Mark S Riddle, Patrick Connor, Jamie Fraser, Chad K Porter, Brett Swierczewski, Emma J Hutley, Brook Danboise, Mark P Simons, Christine Hulseberg, Tahaniyat Lalani, Ramiro L Gutierrez, David R Tribble
Background: Recommended treatment for travelers' diarrhea includes the combination of an antibiotic, usually a fluoroquinolone or azithromycin, and loperamide for rapid resolution of symptoms. However, adverse events, postdose nausea with high-dose azithromycin, effectiveness of single-dose rifaximin, and emerging resistance to front-line agents are evidence gaps underlying current recommendations. Methods: A randomized, double-blind trial was conducted in 4 countries (Afghanistan, Djibouti, Kenya, and Honduras) between September 2012 and July 2015...
September 23, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29028576/bioelectrochromic-hydrogel-for-fast-antibiotic-susceptibility-testing
#8
Ferran Pujol-Vila, Jiri Dietvorst, Laura Gall-Mas, María Díaz-González, Núria Vigués, Jordi Mas, Xavier Muñoz-Berbel
Materials science offers new perspectives in the clinical analysis of antimicrobial sensitivity. However, a biomaterial with the capacity to respond to living bacteria has not been developed to date. We present an electrochromic iron(III)-complexed alginate hydrogel sensitive to bacterial metabolism, here applied to fast antibiotic-susceptibility determination. Bacteria under evaluation are entrapped -and pre-concentrated- in the hydrogel matrix by oxidation of iron (II) ions to iron (III) and in situ formation of the alginate hydrogel in less than 2min and in soft experimental conditions (i...
September 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29028569/occurrence-of-transferable-antibiotic-resistances-in-commercialized-ready-to-eat-mealworms-tenebrio-molitor-l
#9
Andrea Osimani, Federica Cardinali, Lucia Aquilanti, Cristiana Garofalo, Andrea Roncolini, Vesna Milanović, Marina Pasquini, Stefano Tavoletti, Francesca Clementi
The present study aimed to assess the occurrence of transferable determinants conferring resistance to tetracyclines, macrolide-lincosamide-streptogramin B, vancomycin, beta-lactams, and aminoglycosides in 40 samples of commercialized edible mealworms (Tenebrio molitor L.) purchased from European Union (EU) and non-EU producers. A high prevalence of tet(K) was observed in all of the samples assayed, with percentages of PCR-based positivity that ranged from 80% (samples from Thailand) to 100% (samples from the Netherlands, Belgium and France)...
October 5, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29028568/virulence-genotypes-and-antimicrobial-susceptibility-patterns-of-arcobacter-butzleri-isolated-from-seafood-and-its-environment
#10
Srinu Rathlavath, Vandita Kohli, Asem Sanjit Singh, Manjusha Lekshmi, Gayatri Tripathi, Sanath Kumar, Binaya Bhusan Nayak
Arcobacter butzleri is an emerging pathogen isolated from animals, food and the environment. In this study, 147 A. butzleri isolated from seafood and the coastal environment were tested for the presence of ten putative virulence genes (cadF, cj1349, ciaB, mviN, pldA, tlyA, hecA, hecB, irgA, iroE) and antimicrobial susceptibilities. Majority of the isolates harbored mviN (100%), cj1349 (97.2%), ciaB (95.9%), tlyA (91.8%), pldA (91.1%) and cadF (89.7%). Lower detection rates were observed for hecA (10.8%), hecB (19%), iroE (12...
October 3, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29028461/antibiotic-impregnated-central-venous-catheters-do-not-change-antibiotic-resistance-patterns
#11
Isaiah R Turnbull, Sara A Buckman, Christopher B Horn, Grant V Bochicchio, John E Mazuski
BACKGROUND: Antibiotic-impregnated central venous catheters (CVCs) decrease the incidence of infection in high-risk patients. However, use of these catheters carries the hypothetical risk of inducing antibiotic resistance. We hypothesized that routine use of minocycline and rifampin-impregnated catheters (MR-CVC) in a single intensive care unit (ICU) would change the resistance profile for Staphylococcus aureus. METHODS: We reviewed antibiotic susceptibilities of S...
October 13, 2017: Surgical Infections
https://www.readbyqxmd.com/read/29028315/nanoparticles-of-short-cationic-peptidopolysaccharide-self-assembled-by-hydrogen-bonding-with-antibacterial-effect-against-multi-drug-resistant-bacteria
#12
Zheng Hou, Yogesh Vikhe Shankar, Yang Liu, Feiqing Ding, Jothy Lachumy Subramanion, Vikashini Ravikumar, Rubí Zamudio-Vázquez, Damien Keogh, Huiwen Lim, Moon Yue Feng Tay, Surajit Bhattacharjya, Scott A Rice, Jian Shi, Hongwei Duan, Xue-Wei Liu, Yuguang Mu, Nguan Soon Tan, Kam Michael Chiu Tam, Kevin Pethe, Mary B Chan-Park
Cationic antimicrobial peptides (AMPs) and polymers are active against many multi-drug resistant (MDR) bacteria but only a limited number of these compounds are in clinical use due to their unselective toxicity. The typical strategy for achieving selective antibacterial efficacy with low mammalian cell toxicity is through balancing the ratio of cationicity to hydrophobicity. Herein, we report a cationic nanoparticle self-assembled from chitosan-graft-oligolysine (CSM5-K5) chains with ultra-low molecular weight (1450 Daltons) that selectively kills bacteria...
October 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29028276/enhancing-antibiotic-stewardship-by-tackling-spurious-penicillin-allergy
#13
Mamidipudi Thirumala Krishna, Aarnoud P Huissoon, Mark Li, Alex Richter, Devadas Ganesh Pillay, Dhinakaran Sambanthan, Sumanth C Raman, Shuaib Nasser, Siraj A Misbah
Approximately 90-99% of patients with a label of penicillin allergy (PenA) are not allergic when comprehensively investigated. An inaccurate label of PenA has major public health implications - longer hospital stay, more frequent hospital admissions, greater use of fluoroquinolones, glycopeptides, cephalosporins and other expensive antibiotics resulting in significantly higher costs to the health service and predisposing to Clostridium difficile, meticillin-resistant Staphylococcus aureus infections and vancomycin resistant enterococcus...
October 13, 2017: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/29028174/could-frequent-carbapenem-use-be-a-risk-factor-for-colistin-resistance
#14
Aycan Gundogdu, Aysegul Ulu-Kilic, Huseyin Kilic, Esra Ozhan, Dilek Altun, Ozlem Cakir, Emine Alp
AIMS: The antibiotic colistin, which had been previously abandoned, is being brought back as a last line of defense against bacterial infection. However, colistin resistance was reported shortly after its reintroduction. This study evaluated the risk factors for colonization/infections due to colistin-resistant Acinetobacter baumannii (ColR-Ab) and Klebsiella pneumoniae (ColR-Kp) strains and characterized the molecular epidemiology of these two strains. RESULTS: Age, previous hospitalization duration, and previous use of carbapenem and colistin were risk factors for ColR-Kp, whereas previous use of carbapenem and colistin was a risk factor for ColR-Ab...
October 13, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/29028006/polymorphism-of-antibiotic-inactivating-enzyme-driven-by-ecology-expands-the-environmental-resistome
#15
Dae-Wi Kim, Cung Nawl Thawng, Jung-Hye Choi, Kihyun Lee, Chang-Jun Cha
The environmental resistome has been recognized as the origin and reservoir of antibiotic resistance genes and considered to be dynamic and ever expanding. In this study, a targeted gene sequencing approach revealed that the polymorphic diversity of the aminoglycoside-inactivating enzyme AAC(6')-Ib was ecological niche-specific. AAC(6')-Ib-cr, previously known as a clinical variant, was prevalent in various soils and the intestines of chickens and humans, suggesting that this variant might not have arisen from adaptive mutations in the clinic but instead originated from the environment...
October 13, 2017: ISME Journal
https://www.readbyqxmd.com/read/29027789/integrated-bacterial-identification-and-antimicrobial-susceptibility-testing-using-pcr-and-high-resolution-melt
#16
Pornpat Athamanolap, Kuangwen Hsieh, Liben Chen, Samuel Yang, Tza-Huei Wang
Accurate and timely diagnostics are critical for managing bacterial infections. The current gold standard, culture-based diagnostics can provide clinicians with comprehensive diagnostic information including bacterial identity and antimicrobial susceptibility, but they often require several days of turnaround time, which leads to compromised clinical outcome and promotes the spread of antibiotic resistance. Nucleic acid amplification tests such as PCR have significantly accelerated the detection of specific bacteria, but generally lack the capacities for broad-based bacterial identification or antimicrobial susceptibility testing...
October 13, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29027495/monitoring-and-managing-antibiotic-resistance-in-refugee-children
#17
Helena C Maltezou, Dana Elhadad, Daniel Glikman
The past decade the Middle East and Southeastern Europe have witnessed an enormous movement of refugees due to the Syrian war and conflicts in Asia and Africa. Although carriage of and infections with multi-drug resistant (MDR) pathogens in refugees have been reported, pediatric data are scarce. Areas covered: MDR bacterial carriage and infections, and MDR-tuberculosis (TB) in refugee children from 2010. Expert commentary: High MDR carriage rates in refugee children are attributed to high pre-civil war MDR rates, war-damaged infrastructure and healthcare systems, and poor hygiene conditions...
October 13, 2017: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/29027446/-interactions-of-aminoglycosides-with-rnas-and-proteins-via-carbohydrate-microarray
#18
Xueyu Wang, Xiaoli Wang, Beilei Zhang, Jing Hu, Jian Yin
Aminoglycosides are broad-spectrum antibacterials to treat bacterial infections, especially gram-negative bacteria infections. However, aminoglycosides are losing efficacy because of the increase in antibiotic resistance and their inherent toxicity, attracting more interests in developing new aminoglycosides. Several clinically used aminoglycosides are mainly exerted by inhibition of protein synthesis through binding to bacterial rRNA. The bacterial ribosome RNA is the most currently exploited RNA drug target...
October 25, 2016: Sheng Wu Gong Cheng Xue Bao, Chinese Journal of Biotechnology
https://www.readbyqxmd.com/read/29027385/antimicrobial-susceptibilities-of-enterobacteriaceae-in-community-acquired-urinary-tract-infections-during-a-5-year-period-a-single-hospital-study-in-korea
#19
Jin Ju Park, Yu Bin Seo, Jacob Lee
BACKGROUND: Through investigating antimicrobial susceptibility patterns of Enterobacteriaceae in community-acquired urinary tract infection (CA-UTI), we provide basic evidence for the use of empirical antibiotics in CA-UTI. MATERIALS AND METHODS: We retrospectively reviewed the medical records of patients over the age of 19 years who visited a hospital in Seoul between January 2012 and December 2016 for a CA-UTI. Urine cultures were used to identify causative organisms...
September 2017: Infection & Chemotherapy
https://www.readbyqxmd.com/read/29027384/survey-for-correlation-between-biofilm-formation-and-virulence-determinants-in-a-collection-of-pathogenic-and-fecal-enterococcus-faecalis-isolates
#20
Fereshteh Saffari, Mohammad Sadegh Dalfardi, Shahla Mansouri, Roya Ahmadrajabi
BACKGROUND: Enterococcus faecalis is an opportunistic pathogen that causes most of the enterococcal infections. Among the different factors implicated in the pathogenesis of these organisms, biofilm formation and antibiotic resistance are the most important. The ability for biofilm formation has been attributed to the presence of some virulence genes. However, no definite correlation has been found. This study aimed to detect biofilm formation and antibiotic resistance patterns in E. faecalis isolates collected from clinical and fecal samples, and to investigate possible correlation between some virulence genes (esp, cyl, gelE) and biofilm formation...
September 2017: Infection & Chemotherapy
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