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https://www.readbyqxmd.com/read/28317803/an-unusual-antibiotic-susceptibility-pattern-in-a-mycobacterium-cosmeticum-strain-isolated-from-the-chesapeake-bay
#1
Vajini Atukorale, Nicholas Boire, Kim Dionne, Stefan Riedel, Nicole Parrish
OBJECTIVE/BACKGROUND: Mycobacterium cosmeticum, first described in 2004, was recovered from a patient undergoing a cosmetic procedure. Subsequently, this species was associated with an outbreak in a nail salon. In all cases, the isolates were susceptible to all antibiotics tested. Recently, however, we recovered a strain of M. cosmeticum from the Chesapeake Bay, resistant to 11 of 14 antimicrobials. The objective of this work was to present our findings on the resistance and susceptibility of this isolate to various antibiotics...
January 2017: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28315729/pharmacodynamics-of-tigecycline-alone-and-in-combination-with-colistin-against-clinical-isolates-of-multidrug-resistant-acinetobacter-baumannii-in-an-in-vitro-pharmacodynamic-model
#2
Xuejiu Cai, Zhen Yang, Jianqiang Dai, Kun Chen, Huiliang Liu, Wentao Ni, Chuanqi Wei, Junchang Cui
The objectives of this study, which were based on the hypothesis of mutant prevention concentration (MPC), were to compare tigecycline and colistin monotherapy and combination therapy against multidrug-resistant Acinetobacter baumannii (MDR-AB) and to identify changes in the susceptibility of the organism using an in vitro pharmacodynamic model. Human free-drug concentration profiles of colistin and tigecycline used alone and in combination were simulated against four clinical MDR-AB isolates over 24 h. Pharmacodynamic activity was measured as log10 CFU/mL and as the area under the bactericidal curve (AUBC)...
March 16, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28303847/trends-in-drug-resistance-of-acinetobacter-baumannii-over-a-10-year-period-nationwide-data-from-the-china-surveillance-of-antimicrobial-resistance-program
#3
Lei Gao, Yuan Lyu, Yun Li
BACKGROUND: Acinetobacter baumannii has emerged as an important pathogen causing a variety of infections. Using data from the China Surveillance of Antimicrobial Resistance Program conducted biennially, we investigated the secular changes in the resistance of 2917 isolates of A. baumannii from 2004 to 2014 to differ antimicrobial agents. METHODS: Pathogen samples were collected from 17 to 20 hospitals located in the eastern, central, and western regions of China...
March 20, 2017: Chinese Medical Journal
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
#4
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/28302074/clonality-outer-membrane-proteins-profile-and-efflux-pump-in-kpc-producing-enterobacter-sp-in-brazil
#5
Juliana Ferraz Rosa, Camila Rizek, Ana Paula Marchi, Thais Guimaraes, Lourdes Miranda, Claudia Carrilho, Anna S Levin, Silvia F Costa
BACKGROUND: Carbapenems resistance in Enterobacter spp. has increased in the last decade, few studies, however, described the mechanisms of resistance in this bacterium. This study evaluated clonality and mechanisms of carbapenems resistance in clinical isolates of Enterobacter spp. identified in three hospitals in Brazil (Hospital A, B and C) over 7-year. METHODS: Antibiotics sensitivity, pulsed-field gel electrophoresis (PFGE), PCR for carbapenemase and efflux pump genes were performed for all carbapenems-resistant isolates...
March 17, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28291943/a-new-combination-of-a-pleuromutilin-derivative-and-doxycycline-for-treatment-of-multidrug-resistant-acinetobacter-baumannii
#6
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/28291507/comparison-of-the-efficacies-of-three-empirically-selected-antibiotics-for-treating-acinetobacter-baumannii-pulmonary-infection-experience-from-a-teaching-hospital-in-china%C3%A2
#7
Ping Li, Xiaobo Wang, Weixia Wang, Xiaojing Zhao
OBJECTIVE: Infections due to multidrug- and extensively drug-resistant forms of Acinetobacter baumannii (MDR-AB and XDR-AB, respectively) have become increasingly prevalent. This retrospective study compared the outcomes of patients infected with MDR-AB or XDR-AB and treated with one of three antibiotics. METHODS: Enrolled were patients with MDR-AB or XDR-AB pulmonary infection based on their first sputum culture. Patients were treated empirically with carbapenems (n = 46), tigecycline (n = 25), or cefoperazone/sulbactam (cefina-SB; n = 35)...
March 14, 2017: International Journal of Clinical Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28289081/light-modulates-metabolic-pathways-and-other-novel-physiological-traits-in-the-human-pathogen-acinetobacter-baumannii
#8
Gabriela L Müller, Marisel Tuttobene, Matías Altilio, Maitena Martinez Amezaga, Meaghan Nguyen, P Pamela Cribb, Larisa E Cybulski, María Soledad Ramírez, Silvia Altabe, María Alejandra Mussi
Light sensing in chemotrophic bacteria has been relatively recently ascertained. In the human pathogen Acinetobacter baumannii, light modulates motility, biofilm formation and virulence through the BLUF photoreceptor BlsA. In addition, light can induce reduction in susceptibility to certain antibiotics such as minocycline and tigecycline in a photoreceptor-independent manner. In this work we identified new traits whose expression are modulated by light in this pathogen, which comprise not only important determinants related to pathogenicity and antibiotic resistance, but also metabolic pathways, which represents a novel concept for chemotrophic bacteria...
March 13, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28289036/characterizing-the-antimicrobial-activity-of-n-2-n-4-disubstituted-quinazoline-2-4-diamines-towards-multidrug-resistant-acinetobacter-baumannii
#9
Renee Fleeman, Kurt S Van Horn, Megan M Barber, Whittney N Burda, David L Flanigan, Roman Manetsch, Lindsey N Shaw
We previously reported a series of N(2) ,N(4) -disubstituted quinazoline-2,4-diamine as dihydrofolate reductase inhibitors, with potent in vitro and in vivo antibacterial activity against MRSA strains. In this work we extend our previous study to the Gram-negative pathogen Acinetobacter baumannii We determined that optimized N(2) ,N(4) -disubstituted quinazoline-2,4-diamines are strongly antibacterial against multi-drug resistant A. baumannii strains when the 6-position is substituted with a halide or an alkyl substituent...
March 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28286500/diet-induced-obesity-does-not-alter-tigecycline-treatment-efficacy-in-murine-lyme-disease
#10
Helena Pětrošová, Azad Eshghi, Zoha Anjum, Nataliya Zlotnikov, Caroline E Cameron, Tara J Moriarty
Obese individuals more frequently suffer from infections, as a result of increased susceptibility to a number of bacterial pathogens. Furthermore, obesity can alter antibiotic treatment efficacy due to changes in drug pharmacokinetics which can result in under-dosing. However, studies on the treatment of bacterial infections in the context of obesity are scarce. To address this research gap, we assessed efficacy of antibiotic treatment in diet-induced obese mice infected with the Lyme disease pathogen, Borrelia burgdorferi...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28283035/inhibition-of-autophagy-enhances-the-selective-anti-cancer-activity-of-tigecycline-to-overcome-drug-resistance-in-the-treatment-of-chronic-myeloid-leukemia
#11
Ziyuan Lu, Na Xu, Bolin He, Chengyun Pan, Yangqing Lan, Hongsheng Zhou, Xiaoli Liu
BACKGROUND: Drug resistance and disease progression are still the major obstacles in the treatment of chronic myeloid leukemia (CML). Increasing researches have demonstrated that autophagy becomes activated when cancer cells are subjected to chemotherapy, which is involved in the development of drug resistance. Therefore, combining chemotherapy with inhibition of autophagy serves as a new strategy in cancer treatment. Tigecycline is an antibiotic that has received attention as an anti-cancer agent due to its inhibitory effect on mitochondrial translation...
March 10, 2017: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/28276281/in-vitro-susceptibility-and-resistance-phenotypes-in-contemporary-citrobacter-isolates-in-a-university-hospital-in-crete-greece
#12
Sofia Maraki, Konstantinos Z Vardakas, Viktoria-Eirini Mavromanolaki, Margarita Kyriakidou, George Spais, Diamantis P Kofteridis, George Samonis, Matthew E Falagas
BACKGROUND: Data on Citrobacter spp. susceptibility are scarce. We sought to study the evolution in the susceptibility of 385 Citrobacter spp. at the University Hospital of Heraklion, Crete, Greece during a six-year period (2010-2015). METHODS: Non-duplicate strains isolated from inpatients (intensive care unit, oncology, surgery, internal medicine, paediatrics) and outpatients were studied using Vitek 2. Phenotypic confirmatory tests were applied for detection of β-lactamases and aminoglycoside modifying enzymes...
March 9, 2017: Infectious Diseases
https://www.readbyqxmd.com/read/28273381/role-of-combination-antimicrobial-therapy-for-vancomycin-resistant-enterococcus-faecium-infections-review-of-the-current-evidence
#13
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/28270102/antimicrobial-susceptibility-testing-of-rapidly-growing-mycobacteria-isolated-in-japan
#14
Shuji Hatakeyama, Yuki Ohama, Mitsuhiro Okazaki, Yoko Nukui, Kyoji Moriya
BACKGROUND: Difficult-to-treat infections caused by rapidly growing mycobacteria (RGM) are increasingly observed in clinical settings. However, studies on antimicrobial susceptibilities and effective treatments against RGM in Japan are limited. METHODS: We conducted susceptibility testing of potential antimicrobial agents, including tigecycline and tebipenem, against RGM. Clinical RGM isolates were collected from a university hospital in Japan between December 2010 and August 2013...
March 7, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28261566/efflux-pump-overexpression-contributes-to-tigecycline-heteroresistance-in-salmonella-enterica-serovar-typhimurium
#15
Yi Chen, Daxing Hu, Qijing Zhang, Xiao-Ping Liao, Ya-Hong Liu, Jian Sun
Bacterial heteroresistance has been identified in several combinations of bacteria and antibiotics, and it complicated the therapeutic strategies. Tigecycline is being used as one of the optimal options for the treatment of infections caused by multidrug-resistant Salmonella. This study investigated whether heterorresistance to tigecycline exists in a Salmonella enterica serovar Typhimurium strain harboring the oqxAB-bearing IncHI2 plasmid pHXY0908. MIC and population analyses were performed to evaluate population-wide susceptibility to tigecycline...
2017: Frontiers in Cellular and Infection Microbiology
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
#16
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
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
#17
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/28237830/a-need-to-revisit-clinical-breakpoints-of-tigecycline-effect-of-atypical-non-linear-plasma-protein-binding
#18
Ravi Shankar Prasad Singh, Jatinder Kaur Mukker, Stefanie K Drescher, Amelia N Deitchman, Hartmut Derendorf
Tigecycline is highly active against various drug-resistant bacteria. The US Food and Drug Administration (FDA) recently issued a black box warning for tigecycline owing to an associated increase in all-cause mortality. Clinical breakpoints of antibiotics are vital in susceptibility testing of pathogens for the selection of antibiotic therapy; however, no consensus exists between different committees on the clinical breakpoints of tigecycline. Of note, tigecycline exhibits atypical non-linear plasma protein binding (PPB) behaviour, and the pivotal probability of target attainment (PTA) analysis for the determination of clinical breakpoints did not account for the PPB of tigecycline...
February 22, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28235571/efficacy-of-rifampicin-combination-therapy-for-the-treatment-of-enterococcal-infections-assessed-in-vivo-using-a-galleria-mellonella-infection-model
#19
Kirsty Skinner, Jonathan A T Sandoe, Ranjith Rajendran, Gordon Ramage, Sue Lang
Enterococci are a leading cause of healthcare-associated infection worldwide and display increasing levels of resistance to many of the commonly used antimicrobials, making treatment of their infections challenging. Combinations of antibiotics are occasionally employed to treat serious infections, allowing for the possibility of synergistic killing. The aim of this study was to evaluate the effects of different antibacterial combinations against enterococcal isolates using an in vitro approach and an in vivo Galleria mellonella infection model...
February 21, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28223374/enterobacter-cloacae-complex-isolates-harboring-blanmc-a-or-blaimi-type-class-a-carbapenemase-genes-on-novel-chromosomal-integrative-elements-and-plasmids
#20
David A Boyd, Laura F Mataseje, Ross Davidson, Johannes A Delport, Jeff Fuller, Linda Hoang, Brigitte Lefebvre, Paul Levett, Diane L Roscoe, Barbara M Willey, Michael R Mulvey
Carbapenem-resistant Enterobacter cloacae complex isolates submitted to a reference laboratory from 2010 to 2015 were screened by PCR for seven common carbapenemase gene groups, namely, KPC, NDM, OXA-48, VIM, IMP, GES, and NMC-A/IMI. Nineteen of the submitted isolates (1.7%) were found to harbor Ambler class A blaNMC-A or blaIMI-type carbapenemases. All 19 isolates were resistant to at least one carbapenem but susceptible to aminoglycosides, trimethoprim-sulfamethoxazole, tigecycline, and ciprofloxacin. Most isolates (17/19) gave positive results with the Carba-NP test for phenotypic carbapenemase detection...
February 21, 2017: Antimicrobial Agents and Chemotherapy
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