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https://www.readbyqxmd.com/read/29231915/lactobacillus-gasseri-endocarditis-on-the-aortic-valve-bioprosthesis-a-case-report
#1
Waldemar Elikowski, Małgorzata Małek-Elikowska, Monika Lisiecka, Anna Bodora, Katarzyna Wiśniewska, Zofia Oko-Sarnowska
Lactobacillus is a genus of Gram-positive, facultative anaerobic/ microaerophilic, rod-shaped bacteria. Lactobacilli constitute a significant component of the human microbiota in the oral cavity, gastrointestinal tract and female urogenital tract. They are also widely used as probiotics. Rarely, especially in patients with impaired immunity or with structural heart disease, do Lactobacilli become the pathogen responsible for serious infections, e.g. infective endocarditis (IE). CASE REPORT: The authors describe a case of an 80-year-old female with a past history of aortic valve replacement, mitral annuloplasty and pacemaker implantation admitted to hospital due to weakening, subfebrile state and chills...
November 23, 2017: Polski Merkuriusz Lekarski: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/29230684/imipenem-relebactam-and-meropenem-vaborbactam-two-novel-carbapenem-%C3%AE-lactamase-inhibitor-combinations
#2
REVIEW
George G Zhanel, Courtney K Lawrence, Heather Adam, Frank Schweizer, Sheryl Zelenitsky, Michael Zhanel, Philippe R S Lagacé-Wiens, Andrew Walkty, Andrew Denisuik, Alyssa Golden, Alfred S Gin, Daryl J Hoban, Joseph P Lynch, James A Karlowsky
Relebactam (formerly known as MK-7655) is a non-β-lactam, bicyclic diazabicyclooctane, β-lactamase inhibitor that is structurally related to avibactam, differing by the addition of a piperidine ring to the 2-position carbonyl group. Vaborbactam (formerly known as RPX7009) is a non-β-lactam, cyclic, boronic acid-based, β-lactamase inhibitor. The structure of vaborbactam is unlike any other currently marketed β-lactamase inhibitor. Both inhibitors display activity against Ambler class A [including extended-spectrum β-lactamases (ESBLs), Klebsiella pneumoniae carbapenemases (KPCs)] and class C β-lactamases (AmpC)...
December 12, 2017: Drugs
https://www.readbyqxmd.com/read/29227933/synthesis-biological-evaluation-and-metabolic-stability-of-phenazine-derivatives-as-antibacterial-agents
#3
Maddeboina Krishnaiah, Nathalia Rodrigues de Almeida, Venkatareddy Udumula, Zhongcheng Song, Yashpal Singh Chhonker, Mai M Abdelmoaty, Valter Aragao do Nascimento, Daryl J Murry, Martin Conda-Sheridan
Drug-resistant pathogens are a major cause of hospital- and community-associated bacterial infections in the United States and around the world. These infections are increasingly difficult to treat due to the development of antibiotic resistance and the formation of bacterial biofilms. In the paper, a series of phenazines were synthesized and evaluated for their in vitro antimicrobial activity against Gram positive (methicillin resistant staphylococcus aureus, MRSA) and Gram negative (Escherichia coli, E. coli) bacteria...
November 9, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29227931/synthesis-and-antibacterial-evaluation-of-novel-cationic-chalcone-derivatives-possessing-broad-spectrum-antibacterial-activity
#4
Wen-Chao Chu, Peng-Yan Bai, Zhao-Qing Yang, De-Yun Cui, Yong-Gang Hua, Yi Yang, Qian-Qian Yang, En Zhang, Shangshang Qin
There is an urgent need to identify new antibiotics with novel mechanisms that combat antibiotic resistant bacteria. Herein, a series of chalcone derivatives that mimic the essential properties of cationic antimicrobial peptides were designed and synthesized. Antibacterial activities against drug-sensitive bacteria, including Staphylococcus aureus, Enterococcus faecalis, Escherichia coli and Salmonella enterica, as well as clinical multiple drug resistant isolates of methicillin-resistant S. aureus (MRSA), KPC-2-producing and NDM-1-producing Carbapenem-resistant Enterobacteriaceae were evaluated...
December 5, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29226632/novel-bovine-associated-pvapn-plasmid-type-in-rhodococcus-equi-identified-from-lymph-nodes-of-slaughtered-cattle-and-lungs-of-people-living-with-hiv-aids
#5
M G Ribeiro, G H B Lara, P da Silva, M M J Franco, A L de Mattos-Guaraldi, A P C de Vargas, R I Sakate, F R Pavan, B S Colhado, F V R Portilho, R G Motta, T Kakuda, S Takai
Rhodococcus equi is a well-recognized Gram-positive intracellular facultative bacterium that is opportunistic in nature, which causes pyogranulomatous infections in humans and multiple host animals. The pathogenicity of the microorganism has been attributed to the presence of plasmid-encoded virulence-associated proteins (Vap). To date, three host-associated virulence plasmid types of R. equi have been identified as follows: the circular pVAPA and pVAPB, related, respectively, to equine and porcine isolates, and a recently described linear pVAPN plasmid associated with bovine strains, although these three types are found in human isolates...
December 10, 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/29226170/inappropriate-management-of-asymptomatic-patients-with-positive-urine-cultures-a-systematic-review-and-meta-analysis
#6
Myrto Eleni Flokas, Nikolaos Andreatos, Michail Alevizakos, Alireza Kalbasi, Pelin Onur, Eleftherios Mylonakis
Background: Mismanagement of asymptomatic patients with positive urine cultures (referred to as asymptomatic bacteriuria [ASB] in the literature) promotes antimicrobial resistance and results in unnecessary antimicrobial-related adverse events and increased health care costs. Methods: We conducted a systematic review and meta-analysis of studies that reported on the rate of inappropriate ASB treatment published from 2004 to August 2016. The appropriateness of antimicrobial administration was based on guidelines published by the Infectious Diseases Society of America...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/29225987/daptomycin-induced-acute-eosinophilic-pneumonia-late-onset-and-quick-recovery
#7
Mohamad Rachid, Khansa Ahmad, Meghan Saunders-Kurban, Aelia Fatima, Aditya Shah, Anas Nahhas
Background: Daptomycin is a cyclic lipopeptide antibiotic that provides great coverage for gram positive cocci. From the early years of daptomycin use, concerns were raised regarding the pulmonary side effects of daptomycin and potential development of acute eosinophilic pneumonia (AEP) secondary to daptomycin therapy. Discussion: AEP could be idiopathic or induced by drugs or toxins. It is a distinct entity from atopic diseases and autoimmune, parasitic, or fungal infections that can also cause pulmonary eosinophilia...
2017: Case Reports in Pulmonology
https://www.readbyqxmd.com/read/29224318/-distribution-and-drug-resistance-of-pathogens-of-blood-stream-infection-in-patients-with-hematological-malignancies-after-chemotherapy
#8
S Z Chen, K N Lin, M Xiao, X F Luo, Q Li, J H Ren, R Y Huang, M M Chen, Z Z Ally, T Chen, J D Yang, Jianda Hu
Objective: To investigate the distribution and resistance of pathogens isolated from blood cultures in patients with hematological malignancies after chemotherapy in Union Hospital of Fujian Medical University so as to understand the real situation of blood stream infection (BSI) and provide the basis for rational use of antibiotics in clinic. Methods: The data of 657 strains isolated from blood culture specimens of patients with hematological malignancies from January 2013 to December 2016 were collected analyzed...
November 14, 2017: Zhonghua Xue Ye Xue za Zhi, Zhonghua Xueyexue Zazhi
https://www.readbyqxmd.com/read/29224317/-a-multicenter-retrospective-study-of-pathogenic-bacteria-distribution-and-drug-resistance-in-febrile-neutropenic-patients-with-hematological-diseases-in-shanghai
#9
J Zhu, J Hu, Y F Mao, F Y Chen, J Y Zhu, J M Shi, D D Yu, S G Hao, R Tao, P Liu, S Y Gu, J Hou, H Y He, A B Liang, Y Ding, L G Liu, Y H Xie, Q Zhu, Y H Yu, Y H Yao, W Chen, H L Xu, X H Han, C Wang
Objective: To investigate the pathogen spectrum distribution and drug resistance of febrile neutropenic patients with hematological diseases in Shanghai. Methods: A retrospective study was conducted on the clinical isolates from the febrile neutropenic patients hospitalized in the departments of hematology in 12 general hospitals in Shanghai from January 2012 to December 2014. The drug susceptibility test was carried out by Kirby-Bauer method. WHONET 5.6 software was used to analyze pathogenic bacteria and drug susceptibility data...
November 14, 2017: Zhonghua Xue Ye Xue za Zhi, Zhonghua Xueyexue Zazhi
https://www.readbyqxmd.com/read/29224313/-incidence-of-blood-stream-infections-of-1265-patients-with-hematopoietic-stem-cell-transplantation-and-analysis-of-pathogenic-bacteria
#10
Q Z Han, Y Chen, H Yang, X F Zhang, J Chen, D P Wu, S N Chen, H Y Qiu
Objective: To analyze the incidence and microbiological features of blood stream infections (BSI) of patients with hematopoietic stem cell transplantation (HSCT) and to provide laboratory data for empirical use of antibiotic for the HSCT patients with BSI. Methods: The incidence of bloodstream infection, the positive rate of blood culture, bacterial spectrum and drug resistance were analyzed in 1 265 HSCT recipients during 2013 and 2015 were retrospectively studied. Results: Of 1265 patients undergoing HSCT, 1 422 cases of suspected BSI occurred in 784 patients (61...
November 14, 2017: Zhonghua Xue Ye Xue za Zhi, Zhonghua Xueyexue Zazhi
https://www.readbyqxmd.com/read/29223485/preventive-effect-of-anti-vaca-egg-yolk-immunoglobulin-igy-on-helicobacter-pylori-infected-mice
#11
Kyung Sook Hong, Mi-Ran Ki, H M Arif Ullah, Eun-Joo Lee, Yong Deuk Kim, Myung-Jin Chung, Ahmed K Elfadl, Jin-Kyu Park, Kyu-Shik Jeong
BACKGROUND: Helicobacter pylori, a gram-negative bacterium, is the causative agent of gastric disorders and gastric cancer in the human stomach. Vacuolating cytotoxin A (VacA) is among the multi-effect protein toxins released by H. pylori that enables its persistence in the human stomach. METHODS: To evaluate the effect of anti-VacA egg yolk immunoglobulin (anti-VacA IgY) on H. pylori infection, a highly specific anti-VacA IgY was produced from egg yolks of hens immunized with a mixture of two purified recombinant VacAs...
December 6, 2017: Vaccine
https://www.readbyqxmd.com/read/29222019/a-novel-use-of-cellulose-based-filter-paper-containing-silver-nanoparticles-for-its-potential-application-as-wound-dressing-agent
#12
Adnan Haider, Sajjad Haider, Inn-Kyu Kang, Anuj Kumar, Madhusudana Rao Kummara, Tahseen Kamal, Sung Soo Han
The frequent use of antibiotics against microbial infections may lead the emergence of antibiotic resistant microbial strains. To overcome these microbial strains, we need to fabricate alternative materials which can handle them. It is for this reason, we have fabricated cellulose (CE) based filter paper (FP) composite scaffolds comprising of adsorbed chitosan (CS) and sliver (Ag) nanoparticles (NPs). The AgNPs are incorporated in the CS layer of the composite scaffold. Prior to evaluate the efficacy of the scaffolds against gram positive and gram negative bacterial strains, the scaffolds were characterized for the presence of the Ag NPs with field emission scanning electron microscope (FE-SEM), fourier transform infrared (FTIR) spectroscopy and x-ray diffractometer (XRD)...
December 5, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29221750/secondary-surgical-site-infection-after-coronary-artery-bypass-grafting-a-multi-institutional-prospective-cohort-study
#13
Brian C Gulack, Katherine A Kirkwood, Wei Shi, Peter K Smith, John H Alexander, Sandra G Burks, Annetine C Gelijns, Vinod H Thourani, Daniel Bell, Ann Greenberg, Seth D Goldfarb, Mary Lou Mayer, Michael E Bowdish
OBJECTIVE: To analyze patient risk factors and processes of care associated with secondary surgical-site infection (SSI) after coronary artery bypass grafting (CABG). METHODS: Data were collected prospectively between February and October 2010 for consenting adult patients undergoing CABG with saphenous vein graft (SVG) conduits. Patients who developed a deep or superficial SSI of the leg or groin within 65 days of CABG were compared with those who did not develop a secondary SSI...
December 5, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29220792/4-quinolone-derivatives-and-their-activities-against-gram-positive-pathogens
#14
Gui-Fu Zhang, Shu Zhang, Baofeng Pan, Xiaofeng Liu, Lian-Shun Feng
Gram-positive bacteria are responsible for a broad range of infectious diseases, and the emergency and wide spread of drug-resistant Gram-positive pathogens including MRSA and MRSE has caused great concern throughout the world. 4-Quinolones which are exemplified by fluoroquinolones are mainstays of chemotherapy against various bacterial infections including Gram-positive pathogen infections, and their value and role in the treatment of bacterial infections continues to expand. However, the resistance of Gram-positive organisms to 4-quinolones develops rapidly and spreads widely, making them more and more ineffective...
November 29, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29220754/association-of-high-mortality-with-extended-spectrum-%C3%AE-lactamase-esbl-positive-cultures-in-community-acquired-infections
#15
Sumit Ray, Dimple Anand, Sankalp Purwar, Arijit Samanta, Kaustubh V Upadhye, Prasoon Gupta, Debashis Dhar
PURPOSE: Infections due to multidrug resistant organisms have become a serious health concern worldwide. The present study was conducted to investigate the spectrum of microbial resistance pattern in the community and their effects on mortality. METHODS: A retrospective review and analysis of prospectively collected data was done of all patients admitted with diagnosis of sepsis in two tertiary care ICU's for a period of two years. Demographics, culture positivity, microbial spectrum, resistance pattern and outcome data were collected...
October 31, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/29220387/psra-controls-the-synthesis-of-the-pseudomonas-aeruginosa-quinolone-signal-via-repression-of-the-fade-homolog-pa0506
#16
Greg Wells, Samantha Palethorpe, Everett C Pesci
Pseudomonas aeruginosa is a ubiquitous, Gram-negative opportunistic pathogen that can cause disease in various sites within the human body. This bacterium is a major source of nosocomial infections that are often difficult to treat due to high intrinsic antibiotic resistance and coordinated virulence factor production. P. aeruginosa utilizes three cell-to-cell signaling systems to regulate numerous genes in response to cell density. One of these systems utilizes the small molecule 2-heptyl-3-hydroxy-4-quinolone (Pseudomonas quinolone signal [PQS]) as a signal that acts as a co-inducer for the transcriptional regulator PqsR...
2017: PloS One
https://www.readbyqxmd.com/read/29218583/promising-antibacterial-effects-of-silver-nanoparticle-loaded-tea-tree-oil-nanoemulsion-a-synergistic-combination-against-resistance-threat
#17
Roqya Najafi-Taher, Behnaz Ghaemi, Sharmin Kharazi, Samira Rasoulikoohi, Amir Amani
Highly resistant pathogens may be developed in patients with immune disorders after prolonged exposure to antibiotics, a growing threat worldwide. In order to overcome these problems, this study introduces a new class of engineered nanosystems comprising of tea tree oil nanoemulsion (TTO NE) loaded with Ag nanoparticles (NPs). Silver shows a strong toxicity towards a wide range of microorganisms. Also, TTO NE could be employed as a promising and safe antimicrobial agent for local therapies of bacterial infections...
December 7, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/29216940/-study-on-risk-factor-of-central-venous-catheter-infection-in-icu-1-160-patients-report
#18
Ming Zhang, Yongqing Xu, Zhiming Jiang, Junying Qian, Zhonghui Zhang, Nannan Sun, Jian Xie, Tao Li
OBJECTIVE: To analyze the etiology and risk factors of central venous catheter (CVCs) infections, and to explore the prophylaxis and treatment for catheter-related infections. METHODS: A retrospective study was conducted. The patients with CVCs admitted to intensive care unit (ICU) of Qianfoshan Hospital Affiliated to Shandong University from January 2000 to December 2016 were enrolled. The gender, age, catheter data and microorganism culture results of all patients were collected...
December 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/29216934/from-commensal-to-consumer-staphylococcus-aureus-toxins-diseases-and-detection-methods
#19
Angela T Nguyen, Sandra M Tallent
Staphylococcus aureus is a Gram-positive bacterium capable of causing a wide array of infections. Generally a commensal organism, S. aureus encodes several virulence mechanisms that contribute to disease progression. This review highlights toxins as a secreted virulence factor by S. aureus, the diseases that manifest as a result, and the methods used to detect them. In particular, the advantages and limitations of current toxin detection methods are discussed.
December 8, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/29215863/near-infrared-laser-excited-nanoparticles-to-eradicate-multidrug-resistant-bacteria-and-promote-wound-healing
#20
Yue Qiao, Fei Ma, Chao Liu, Bo Zhou, Qiaolin Wei, Wanlin Li, Danni Zhong, Yangyang Li, Min Zhou
With the ever-growing threat of bacterial infections, especially for multidrug-resistant microbial infections, the development of highly effective treatment modalities to inhibit the infections is challenging. Although silver nanoparticles have been intensively applied as an antimicrobial agent for decades, the therapeutic efficacy towards multidrug-resistant bacteria is still unsatisfactory. Here, we show that near-infrared (NIR) laser-excited silver triangular nanoparticles (Tri-Ag) can efficiently kill Gram-negative Escherichia coli (E...
December 7, 2017: ACS Applied Materials & Interfaces
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