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https://www.readbyqxmd.com/read/28637339/emergence-of-ceftazidime-avibactam-non-susceptibility-in-an-mdr-klebsiella-pneumoniae-isolate
#1
Anna Both, Henning Büttner, Jiabin Huang, Markus Perbandt, Cristina Belmar Campos, Martin Christner, Florian P Maurer, Stefan Kluge, Christina König, Martin Aepfelbacher, Dominic Wichmann, Holger Rohde
Background: Avibactam is a novel broad-range β-lactamase inhibitor active against Ambler class A (including ESBL and KPC) and some Ambler class C and D (e.g. OXA-48) enzymes. We here report on the emergence of ceftazidime/avibactam resistance in clinical, multiresistant, OXA-48 and CTX-M-14-producing Klebsiella pneumoniae isolate DT12 during ceftazidime/avibactam treatment. Methods and results: Comparative whole-genome sequence analysis identified two SNPs in the CTX-M-14-encoding gene leading to two amino acid changes (P170S and T264I)...
June 16, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28630204/a-low-molecular-weight-alginate-oligosaccharide-disrupts-pseudomonal-microcolony-formation-and-enhances-antibiotic-effectiveness
#2
Manon F Pritchard, Lydia C Powell, Alison A Jack, Kate Powell, Konrad Beck, Hannah Florance, Julian Forton, Philip D Rye, Arne Dessen, Katja E Hill, David W Thomas
In chronic respiratory disease the formation of dense, 3-dimensional 'micro colonies' by Pseudomonas aeruginosa within the airway plays an important role in contributing to resistance to treatment. An in vitro biofilm model of pseudomonal microcolony formation using artificial sputum (AS) medium was established to study the effects of low molecular weight alginate oligomers (OligoG CF-5/20) on pseudomonal growth, microcolony formation and the efficacy of colistin. The studies employed clinical cystic fibrosis (CF) isolates (n=3) and reference non-mucoid and mucoid multi-drug resistant (MDR) CF isolates (n=7)...
June 19, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28625141/bedaquiline-a-new-hope-for-shorter-and-better-anti-tuberculosis-regimens
#3
Niccolò Riccardi, Filippo Del Puente, Federica Magnè, Lucia Taramasso, Antonio Di Biagio
In 2014, an estimated 1.8 million people died from Mycobacterium tuberculosis (MTB); moreover, 680,000 people developed multidrug-resistant TB (MDR-TB). Currently available anti-MDR and XDR regimens are long-lasting and expensive, need high adherence and are undermined by a high frequency of adverse drug events, thus leading to a low success rate; moreover, in the last 50 years only two new molecules, bedaquiline (BDQ) and delamanid, have been approved and released for treatment of MDR-TB. BDQ is a diarylquinoline anti-mycobacterial drug, active regardless the state of MTB; in fact, its efficacy is conserved against replicating and non-replicating bacilli, despite extracellular or intracellular location...
June 19, 2017: Recent Patents on Anti-infective Drug Discovery
https://www.readbyqxmd.com/read/28621642/spectrum-and-antibiotic-resistance-of-uropathogens-between-2004-and-2015-in-a-tertiary-care-hospital-in-hungary
#4
András Magyar, Béla Köves, Károly Nagy, András Dobák, Vinodh Kumar Adithyaa Arthanareeswaran, Péter Bálint, Florian Wagenlehner, Péter Tenke
PURPOSE: Surveillance of the bacterial spectrum and antibiotic-resistance patterns of locally occurring uropathogens is essential to serve as a basis for empirical treatment of urinary tract infections (UTIs), as antibiotic-resistance rates may vary geographically with significant differences between countries and regions, and with time. METHODOLOGY: We retrospectively analysed all urine samples taken in the department of urology in a tertiary care hospital in Hungary from January 2004 to December 2015...
June 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28620844/comparison-of-the-characteristics-of-mycobacterium-tuberculosis-isolates-from-sputum-and-lung-lesions-in-chronic-tuberculosis-patients
#5
M-S Hong, Y Kim, E-J Cho, J-S Lee, H-K Kwak, J-H Kim, C-T Kim, J-S Cho, S-K Park, D Jeon, Y-I Choi, H Lee, S-Y Eum
Mycobacterium tuberculosis (Mtb) in sputum originates from lung cavities in tuberculosis (TB) patients. But drug susceptibility testing (DST) of sputum Mtb can not be conducted the same as in the lung because mutagenesis of bacilli may be happening in the lung during treatment and result in the possibility of the presence of heterogeneous drug-resistant subpopulations in the different lung lesions. This could be one of the reasons for low cure rates for multi-drug resistant (MDR)-TB. We studied the resected lungs of nine surgery patients with chronic TB...
June 15, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28614982/intraventricular-administration-of-tigecycline-for-the-treatment-of-multidrug-resistant-bacterial-meningitis-after-craniotomy-a-case-report
#6
Yuanxing Wu, Kai Chen, Jingwei Zhao, Qiang Wang, Jianxin Zhou
BACKGROUND: Intracranial infections, especially multidrug-resistant (MDR) bacterial meningitis, are one of the most severe complications after craniotomy and may greatly impact patient outcomes. CASE PRESENTATION: We report a case of severe MDR Klebsiella pneumonia meningitis after craniotomy that was treated with three different dosages of tigecycline (Pfizer, New York, NY, U.S.A.)via a combined intravenous (IV) and intracerebroventricular (ICV) administration...
June 14, 2017: Journal of Chemotherapy
https://www.readbyqxmd.com/read/28612844/nlrp3-inflammasome-pathway-has-a-critical-role-in-the-host-immunity-against-clinically-relevant-acinetobacter-baumannii-pulmonary-infection
#7
N Dikshit, S D Kale, H J Khameneh, V Balamuralidhar, C Y Tang, P Kumar, T P Lim, T T Tan, A L Kwa, A Mortellaro, B Sukumaran
The opportunistic Gram-negative bacterium Acinetobacter baumannii (AB) is a leading cause of life-threatening nosocomial pneumonia. Outbreaks of multidrug resistant (MDR)-AB belonging to international clones (ICs) I and II with limited treatment options are major global health threats. However, the pathogenesis mechanisms of various AB clonal groups are understudied. Although inflammation-associated interleukin-1β (IL-1β) levels and IL-1 receptor antagonist polymorphisms were previously implicated in MDR-AB-related pneumonia in patients, whether inflammasomes has any role in the host defense and/or pathogenesis of clinically relevant A...
June 14, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28612707/genetic-characteristic-of-class-1-integrons-in-proteus-mirabilis-isolates-from-urine-samples
#8
Chih-Ming Chen, Chih-Ho Lai, Hwa-Jene Wu, Lii-Tzu Wu
BACKGROUND: Proteus mirabilis is an opportunistic pathogen, commonly associated with complicated urinary tract infections (UTIs). UTIs caused by multidrug-resistant Proteus mirabilis have increased worldwide. Multidrug-resistance of Gram-negative enteric bacteria is usually associated with class 1 integrons. PURPOSES: To investigate the prevalence and characterize gene cassettes of class 1 integrons in multidrug-resistant P. mirabilis Methods: From 2006 to 2008, 314 P...
June 2017: BioMedicine
https://www.readbyqxmd.com/read/28609570/on-the-challenges-of-detecting-whole-staphylococcus-aureus-cells-with-biosensors
#9
REVIEW
V Templier, Y Roupioz
Due to the increasing number of nosocomial infections and multidrug resistant (MDR) bacterial strains, Staphylococcus aureus is now a major worldwide concern. Rapid detection and characterization of this bacterium has become an important issue for biomedical applications. Biosensors are increasingly appearing as low-cost, easy-to-operate and fast alternatives for rapid detection. In this review, we will introduce the main characteristics of S. aureus, and will focus on the interest of biosensors for a faster detection of whole S...
June 13, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28607025/pharmacodynamic-evaluation-of-fosfomycin-against-e-coli-and-klebsiella-spp-from-urinary-tract-infections-and-the-influence-of-ph-on-fosfomycin-activities
#10
Nayara Helisandra Fedrigo, Josmar Mazucheli, James Albiero, Danielle Rosani Shinohara, Fernanda Gomes Lodi, Ana Cristina Dos Santos Machado, Sherwin K B Sy, Maria Cristina Bronharo Tognim
Fosfomycin is widely used for the treatment of uncomplicated urinary tract infection (UTI) and recently have been recommended for treating multidrug-resistant (MDR) gram-negative bacilli. Whether urine acidification can improve bacterial susceptibility to fosfomycin oral dosing regimen has not been analyzed. Minimal inhibitory concentration (MIC) was determined using agar dilution in pH 6.0 and 7.0 for 245 Gram negative bacterial isolates, consisting of 158 E. coli and 87 Klebsiella spp. which were collected from patients with UTI...
June 12, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28607022/pharmacokinetics-of-pyrazinamide-optimising-dosing-regimens-for-drug-sensitive-and-resistant-tuberculosis
#11
Maxwell T Chirehwa, Helen McIlleron, Roxana Rustomjee, Thuli Mthiyane, Philip Onyebujoh, Peter Smith, Paolo Denti
Pyrazinamide is used in the treatment of tuberculosis(TB) because its sterilising effect against tubercle bacilli allows treatment shortening. It is part of standard treatment for drug-susceptible and drug-resistant TB, and it is being considered as a companion drug in novel regimens. The aim of this analysis was to characterize factors contributing to the variability in exposure and to evaluate drug exposures using alternative doses, thus providing evidence to support revised dosing recommendations for drug-susceptible and multi-drug resistant tuberculosis(MDR-TB)...
June 12, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28606995/synergistic-antibacterial-effect-of-silver-and-ebselen-against-multidrug-resistant-gram-negative-bacterial-infections
#12
Lili Zou, Jun Lu, Jun Wang, Xiaoyuan Ren, Lanlan Zhang, Yu Gao, Martin E Rottenberg, Arne Holmgren
Multidrug-resistant (MDR) Gram-negative bacteria account for a majority of fatal infections, and development of new antibiotic principles and drugs is therefore of outstanding importance. Here, we report that five most clinically difficult-to-treat MDR Gram-negative bacteria are highly sensitive to a synergistic combination of silver and ebselen. In contrast, silver has no synergistic toxicity with ebselen on mammalian cells. The silver and ebselen combination causes a rapid depletion of glutathione and inhibition of the thioredoxin system in bacteria...
June 12, 2017: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/28606115/peripheral-neuropathy-in-a-diabetic-child-treated-with-linezolid-for-multidrug-resistant-tuberculosis-a-case-report-and-review-of-the-literature
#13
Aravind Swaminathan, Philipp du Cros, James A Seddon, Shamsiya Mirgayosieva, Rajabov Asladdin, Zulfiya Dusmatova
BACKGROUND: Extensively drug-resistant (XDR) tuberculosis (TB) and multidrug resistant (MDR)-TB with additional resistance to injectable agents or fluoroquinolones are challenging to treat due to lack of available, effective drugs. Linezolid is one of the few drugs that has shown promise in treating these conditions. Long-term linezolid use is associated with toxicities such as peripheral and optic neuropathies. Diabetes mellitus (DM), especially when uncontrolled, can also result in peripheral neuropathy...
June 12, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28587631/bacterial-etiologic-agents-causing-neonatal-sepsis-and-associated-risk-factors-in-gondar-northwest-ethiopia
#14
Tsehaynesh G/Eyesus, Feleke Moges, Setegn Eshetie, Biruk Yeshitela, Ebba Abate
BACKGROUND: Neonatal sepsis is a blood stream infection which is seen in the first month of life of the neonate. Bacterial profile of neonatal septicemia is constantly changing thus, current knowledge on the patterns of bacterial isolates, its antibiotic resistance profile, and associated factors, are essential to design and implement appropriate interventions. Therefore, the aim of this study was to identify bacterial etiologic agents, their antimicrobial susceptibility pattern and associated risk factors of neonatal sepsis among neonates...
June 6, 2017: BMC Pediatrics
https://www.readbyqxmd.com/read/28584635/interactions-between-polymorphisms-in-the-3-untranslated-region-of-the-cyclin-dependent-kinase-6-gene-and-the-human-papillomavirus-infection-and-risk-of-cervical-precancerous-lesions
#15
Xingguang Ye, Lipeng Jing, Xingming Zhong, Di Xiao, Meiling Ou, Congcong Guo, Guang Yang, Chunxia Jing, Xiangcai Wei
The human papillomavirus (HPV) infection is essential for the development of cervical cancer and its precursor lesions. However, only certain persistently infected individuals develop cervical cancer. Cyclin-dependent kinase 6 (CDK6) is a critical regulatory cancer-associated gene in the cell cycle and in tumorigenesis. Single nucleotide polymorphisms (SNPs) in microRNA sites in the 3'-untranslated region (UTR) of target genes may result in target gene expression level changes and susceptibility to diseases, including cancer...
June 2017: Biomedical Reports
https://www.readbyqxmd.com/read/28584139/genomic-analysis-of-multidrug-resistant-escherichia-coli-from-north-carolina-community-hospitals-ongoing-circulation-of-ctx-m-producing-st131-h30rx-and-st131-h30r1-strains
#16
Hajime Kanamori, Christian M Parobek, Jonathan J Juliano, James R Johnson, Brian D Johnston, Timothy J Johnson, David J Weber, William A Rutala, Deverick J Anderson
Escherichia coli sequence type 131 (ST131) predominates globally among multidrug-resistant (MDR) E. coli We used whole-genome sequencing (WGS) to investigate 63 MDR E. coli isolates from 7 North Carolina community hospitals (2010-2015). Of these, 39 (62%) represented ST131, including 37 (95%) from the ST131-H30R subclone: 10 (27%) from its H30R1 subset, and 27 (69%) from its H30Rx subset. ST131 core genomes differed by a median of 15 single-nucleotide variants (SNVs) overall (range, 0-490), vs. only 7 within H30R1 (range, 3-12 SNVs) and 11 within H30Rx (range, 0-21)...
June 5, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28581702/universal-coating-from-electrostatic-self-assembly-to-prevent-multi-drug-resistant-bacteria-colonization-on-medical-devices-solid-surfaces
#17
Wenshu Zheng, Yuexiao Jia, Wenwen Chen, Guanlin Wang, Xuefeng Guo, Xingyu Jiang
We provide a facile and scalable strategy to prepare gold nanoparticles (AuNPs)-based antibacterial coating on a variety of surfaces through electrostatic self-assembly. 4,6-diamino-2-pyrimidinethiol (DAPT, itself non-antibiotic)-conjugated AuNPs (AuDAPT) can from highly stable coating on different substrates in one-step, such coating can efficiently eradicate pathogenic gram-negative bacteria and even multidrug resistant (MDR) mutants without causing any side-effect such as cytotoxicity, hemolysis, coagulation and inflammation...
June 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28580804/burden-of-antimicrobial-resistance-in-an-era-of-decreasing-susceptibility
#18
Glenn S Tillotson, Stephen H Zinner
Antimicrobial resistance has become a global problem. Many pathogens are becoming multidrug-resistant with the attendant increased risk of failure of standard therapies and the under-recognised outcomes such as increased morbidity, mortality, length of hospitalization and costs of treatment. Areas covered: We undertook a review of the literature using standard search engines including PubMed, Google Scholar, Scopus and internet sources. Key search terms included antimicrobial resistance, antibiotic resistance, bacterial resistance, clinical outcomes, economic consequences, Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, Streptococcus pneumoniae and Staphylococcus aureus...
June 13, 2017: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/28578555/infections-due-to-acinetobacter-baumannii-in-the-icu-treatment-options
#19
Joseph P Lynch, George G Zhanel, Nina M Clark
Bacteria within the genus Acinetobacter (principally A. baumannii-calcoaceticus complex [ABC]) are gram-negative coccobacilli that may cause nosocomial infections in critically ill or debilitated patients (particularly ventilator-associated pneumonia and infections of the bloodstream, urinary tract, and wounds). Treatment of Acinetobacter infections is difficult, as Acinetobacter spp. are intrinsically resistant to multiple antimicrobial agents, and have a remarkable ability to acquire new resistance determinants via mechanisms that include plasmids, transposons, integrons, and resistance islands...
June 2017: Seminars in Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28575064/antimicrobial-resistance-of-klebsiella-pneumoniae-stool-isolates-circulating-in-kenya
#20
Chris Rowe Taitt, Tomasz A Leski, Daniel P Erwin, Elizabeth A Odundo, Nancy C Kipkemoi, Janet N Ndonye, Ronald K Kirera, Abigael N Ombogo, Judd L Walson, Patricia B Pavlinac, Christine Hulseberg, Gary J Vora
We sought to determine the genetic and phenotypic antimicrobial resistance (AMR) profiles of commensal Klebsiella spp. circulating in Kenya by testing human stool isolates of 87 K. pneumoniae and three K. oxytoca collected at eight locations. Over one-third of the isolates were resistant to ≥3 categories of antimicrobials and were considered multidrug-resistant (MDR). We then compared the resistance phenotype to the presence/absence of 238 AMR genes determined by a broad-spectrum microarray and PCR. Forty-six genes/gene families were identified conferring resistance to β-lactams (ampC/blaDHA, blaCMY/LAT, blaLEN-1, blaOKP-A/OKP-B1, blaOXA-1-like family, blaOXY-1, blaSHV, blaTEM, blaCTX-M-1 and blaCTX-M-2 families), aminoglycosides (aac(3)-III, aac(6)-Ib, aad(A1/A2), aad(A4), aph(AI), aph3/str(A), aph6/str(B), and rmtB), macrolides (mac(A), mac(B), mph(A)/mph(K)), tetracyclines (tet(A), tet(B), tet(D), tet(G)), ansamycins (arr), phenicols (catA1/cat4, floR, cmlA, cmr), fluoroquinolones (qnrS), quaternary amines (qacEΔ1), streptothricin (sat2), sulfonamides (sul1, sul2, sul3), and diaminopyrimidines (dfrA1, dfrA5, dfrA7, dfrA8, dfrA12, dfrA13/21/22/23 family, dfrA14, dfrA15, dfrA16, dfrA17)...
2017: PloS One
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