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https://www.readbyqxmd.com/read/28634536/telavancin-a-novel-semisynthetic-lipoglycopeptide-agent-to-counter-the-challenge-of-resistant-gram-positive-pathogens
#1
REVIEW
Biswadeep Das, Chayna Sarkar, Debasmita Das, Amit Gupta, Arnav Kalra, Shubham Sahni
Telavancin (TD-6424), a semisynthetic lipoglycopeptide vancomycin-derivative, is a novel antimicrobial agent developed by Theravance for overcoming resistant Gram-positive bacterial infections, specifically methicillin-resistant Staphylococcus aureus (MRSA). The US Food and Drug Administration (USFDA) had approved telavancin in 2009 for the treatment of complicated skin and skin structure infections (cSSSIs) caused by Gram-positive bacteria, including MRSA (S. aureus, Streptococcus agalactiae, Streptococcus pyogenes, Streptococcus anginosus group, or Enterococcus faecalis)...
March 2017: Therapeutic Advances in Infectious Disease
https://www.readbyqxmd.com/read/28633678/variation-in-empiric-coverage-versus-detection-of-methicillin-resistant-staphylococcus-aureus-and-pseudomonas-aeruginosa-in-hospitalizations-for-community-onset-pneumonia-across-128-us-veterans-affairs-medical-centers
#2
Barbara E Jones, Kevin Antoine Brown, Makoto M Jones, Benedikt D Huttner, Tom Greene, Brian C Sauer, Karl Madaras-Kelly, Michael A Rubin, Matthew Bidwell Goetz, Matthew H Samore
OBJECTIVE To examine variation in antibiotic coverage and detection of resistant pathogens in community-onset pneumonia. DESIGN Cross-sectional study. SETTING A total of 128 hospitals in the Veterans Affairs health system. PARTICIPANTS Hospitalizations with a principal diagnosis of pneumonia from 2009 through 2010. METHODS We examined proportions of hospitalizations with empiric antibiotic coverage for methicillin-resistant Staphylococcus aureus (MRSA) and Pseudomonas aeruginosa (PAER) and with initial detection in blood or respiratory cultures...
June 21, 2017: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/28632946/emerging-biomarkers-of-illness-severity-urinary-metabolites-associated-with-sepsis-and-necrotizing-methicillin-resistant-staphylococcus-aureus-pneumonia
#3
Lilliam Ambroggio, Todd A Florin, Samir S Shah, Richard Ruddy, Larisa Yeomans, Julie Trexel, Kathleen A Stringer
STUDY OBJECTIVE: To illustrate the potential of metabolomics to identify novel biomarkers of illness severity in a child with fatal necrotizing pneumonia caused by methicillin-resistant Staphylococcus aureus (MRSA). DESIGN: Case report with two control groups and a metabolomics analysis. PATIENTS: An infant with fatal MRSA pneumonia, four children with influenza pneumonia (pneumonia control group), and seven healthy children with no known infections (healthy control group)...
June 20, 2017: Pharmacotherapy
https://www.readbyqxmd.com/read/28631399/into-the-storm-chasing-the-opportunistic-pathogen-staphylococcus-aureus-from-skin-colonisation-to-life-threatening-infections
#4
James P O'Gara
Colonisation of the human skin by Staphylococcus aureus is a precursor for a variety of infections ranging from boils to sepsis and pneumonia. The rapid emergence of methicillin resistant S. aureus (MRSA) following the clinical introduction of this antimicrobial drug and reports of resistance to all currently used anti-staphylococcal drugs has added to its formidable reputation. S. aureus survival on the skin and in vivo virulence is underpinned by a remarkable environmental adaptability, made possible by highly orchestrated regulation of gene expression and a capacity to undertake genome remodelling...
June 19, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28629753/active-identification-of-patients-who-are-methicillin-resistant-staphylococcus-aureus-colonized-is-not-associated-with-longer-duration-of-vancomycin-therapy
#5
Carlos Acuna-Villaorduna, Westyn Branch-Elliman, Judith Strymish, Kalpana Gupta
BACKGROUND: Excessive prescribing of vancomycin among patients admitted to inpatient wards is a challenge for antimicrobial stewardship programs, especially in the setting of expanded screening programs for methicillin-resistant Staphylococcus aureus (MRSA). Studies examining factors associated with longer duration of vancomycin use are limited. METHODS: We conducted a retrospective cohort study to assess the impact of universal MRSA admission screening on duration of vancomycin use at the VA Boston Healthcare System during the period from January 2013-November 2015...
June 16, 2017: American Journal of Infection Control
https://www.readbyqxmd.com/read/28608660/emergence-of-community-genotype-methicillin-resistant-staphylococcus-aureus-in-korean-hospitals-clinical-characteristics-of-nosocomial-infections-by-community-genotype-strain
#6
Eun Jeong Joo, Doo Ryeon Chung, So Hyun Kim, Jin Yang Baek, Nam Yong Lee, Sun Young Cho, Young Eun Ha, Cheol In Kang, Kyong Ran Peck, Jae Hoon Song
BACKGROUND: As community-genotype methicillin-resistant Staphylococcus aureus (MRSA) strains spread into hospitals, the genotypes of the MRSA strains causing hospital-acquired (HA) infections have become more diverse. We describe clinical characteristics of nosocomial MRSA infections by a community-genotype of sequence type (ST) 72. MATERIALS AND METHODS: A case-control study was designed among patients with HA-MRSA infections. Forty patients with infections caused by ST72-MRSA SCCmec type IV were selected as cases...
May 26, 2017: Infection & Chemotherapy
https://www.readbyqxmd.com/read/28607024/population-pharmacokinetics-of-tigecycline-in-critically-ill-patients-with-severe-infections
#7
Jiao Xie, Jason A Roberts, Abdulaziz S Alobaid, Claire Roger, Yan Wang, Qianting Yang, Jinyao Sun, Haiyan Dong, Xue Wang, Jianfeng Xing, Jeffrey Lipman, Yalin Dong
Objectives: We sought to describe the population pharmacokinetics of tigecycline in critically ill patients and describe optimized dosing regimens of tigecycline for different bacterial infections.Methods: This prospective study included ten critically ill patients given a standard dose of tigecycline. Blood samples were collected during one dosing interval and analyzed using validated chromatography. Population pharmacokinetics and Monte Carlo dosing simulations were undertaken using Pmetrics. Three target exposures, ratios of 24h area under the curve to minimum inhibitory concentrations (AUC0-24/MIC), were evaluated (≥17...
June 12, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28605339/anti-mrsa-activity-of-fruiting-body-extracts-of-spectacular-rustgill-mushroom-gymnopilus-junonius-agaricomycetes
#8
Stephanie Barneche, Silvana Alborés, Graciela Borthagaray, María Pía Cerdeiras, Alvaro Vázquez
Despite the great advances in chemotherapeutics, infectious diseases are still one of the leading causes of death worldwide. Among some of the clinically relevant pathogens, methicillin-resistant Staphylococcus aureus (MRSA) ranks as one of the most difficult bacteria to treat. It is a common cause of skin, soft-tissue, and endovascular infections, as well as pneumonia, septic arthritis, endocarditis, osteomyelitis, and sepsis. The research on Basidiomycota is extensive; many species show a broad spectrum of pharmacological activities, including antimicrobial activity...
2017: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/28594345/synthesis-and-evaluation-of-antimicrobial-activity-of-r%C3%A2-w%C3%A2-k-levofloxacin-and-r%C3%A2-w%C3%A2-k-levofloxacin-q-conjugates
#9
Neda Riahifard, Kathy Tavakoli, Jason Yamaki, Keykavous Parang, Rakesh Tiwari
The development of a new class of antibiotics to fight bacterial resistance is a time-consuming effort associated with high-cost and commercial risks. Thus, modification, conjugation or combination of existing antibiotics to enhance their efficacy is a suitable strategy. We have previously reported that the amphiphilic cyclic peptide [R₄W₄] had antibacterial activity with a minimum inhibitory concentration (MIC) of 2.97 µg/mL against Methicillin-resistant Staphylococcus aureus (MRSA). Herein, we hypothesized that conjugation or combination of the amphiphilic cyclic peptide [R₄W₄] with levofloxacin or levofloxacin-Q could improve the antibacterial activity of levofloxacin and levofloxacin-Q...
June 8, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28588618/ventilator-management-of-bronchopleural-fistula-secondary-to-methicillin-resistant-staphylococcus-aureus-necrotizing-pneumonia-in-a-pregnant-patient-with-systemic-lupus-erythematosus
#10
Ahmed F Alohali, Saleh Abu-Daff, Kamardeen Alao, Mohammed Almaani
Managing mechanical ventilation in patient with bronchopleural fistula with coexisting acute respiratory distress syndrome is a challenging situation for the intensivist. We are reporting a case of a pregnant patient with systemic lupus erythematosus on immunosuppressive medications who developed methicillin-resistant Staphylococcus aureus necrotizing pneumonia complicated by bronchopleural fistula and acute respiratory distress syndrome.
2017: Case Reports in Medicine
https://www.readbyqxmd.com/read/28580804/burden-of-antimicrobial-resistance-in-an-era-of-decreasing-susceptibility
#11
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/28578550/ventilator-associated-pneumonia-the-role-of-emerging-diagnostic-technologies
#12
Marin H Kollef, Carey-Ann D Burnham
Antibiotic resistance has emerged as a key determinant of outcome in patients with serious infections along with the virulence of the underlying pathogen. Within the intensive care unit (ICU) setting, ventilator-associated pneumonia (VAP) is a common nosocomial infection that is frequently caused by multidrug-resistant bacteria. Antimicrobial resistance is a growing challenge in the care of critically ill patients. Escalating rates of antibiotic resistance add substantially to the morbidity, mortality, and cost related to infection in the ICU...
June 2017: Seminars in Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28572329/complete-genome-sequence-of-a-community-associated-methicillin-resistant-staphylococcus-aureus-hypervirulent-strain-usa300-c2406-isolated-from-a-patient-with-a-lethal-case-of-necrotizing-pneumonia
#13
Jo-Ann McClure, Kunyan Zhang
USA300 is a predominant community-associated methicillin-resistant Staphylococcus aureus strain causing significant morbidity and mortality. We present here the full annotated genome of a USA300 hypervirulent clinical strain, USA300-C2406, isolated from a patient with a lethal case of necrotizing pneumonia, to gain a better understanding of USA300 hypervirulence.
June 1, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28535606/isolation-purification-and-characterization-of-five-active-diketopiperazine-derivatives-from-endophytic-streptomyces-suk-25-with-antimicrobial-and-cytotoxic-activities
#14
Muhanna M Alshaibani, Juriyati Jalil, Nik M Sidik, Siti Junaidah Ahmad, Nurkhalida Kamal, Ruangelie Edrada-Ebel, Noraziah M Zin
On our search for new sources of bioactive secondary metabolites from Streptomyces sp., the ethyl acetate extracts from the endophytic Streptomyces SUK 25 afforded five active diketopiperazines compounds. The aim of this study was to characterize the bioactive compounds isolated from endophytic Streptomyces SUK 25 and evaluate its bioactivity against multiple drug resistance (MDR) bacteria such as Enterococcus raffinosus, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumanii, Pseudomonas aeruginosa and Enterobacter spp...
May 24, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28532398/clinical-outcomes-of-linezolid-and-vancomycin-in-patients-with-nosocomial-pneumonia-caused-by-methicillin-resistant-staphylococcus-aureus-stratified-by-baseline-renal-function-a-retrospective-cohort-analysis
#15
Ping Liu, Blair Capitano, Amy Stein, Ali A El-Solh
BACKGROUND: The primary objective of this study is to assess whether baseline renal function impacts treatment outcomes of linezolid and vancomycin (with a dose-optimized regimen) for methicillin-resistant Staphylococcus aureus (MRSA) pneumonia. METHODS: We conducted a retrospective cohort analysis of data generated from a prospective, randomized, controlled clinical trial (NCT 00084266). The analysis included 405 patients with culture-proven MRSA pneumonia. Baseline renal function was stratified based on creatinine clearance...
May 22, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28527358/improving-the-pharmacokinetics-and-tissue-distribution-of-pyrinezolid-by-self-assembled-polymeric-micelles
#16
Haiyue Long, Xiaoling Li, Zitai Sang, Lan Mei, Tao Yang, Zicheng Li, Liangxue Zhou, Yu Zheng, Gu He, Gang Guo, Zhenling Wang, Yong Deng, Youfu Luo
Antibiotic-resistance by bacteria is a growing global concern within the healthcare field, and it has provided an impetus for continued antimicrobial development. Pyrinezolid (PZ), a novel oxazolidinone compound, can effectively inhibit most gram-positive bacteria, including methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococci (VRE). Though PZ is a promising antimicrobial candidate, the druggability of PZ is limited by its poor water solubility. Therefore, the amphipathic mPEG-PLLA copolymer was used to prepare the pyrinezolid micelles (PZ-M)...
May 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28515091/angiotensin-converting-enzyme-enhances-the-oxidative-response-and-bactericidal-activity-of-neutrophils
#17
Zakir Khan, Xiao Z Shen, Ellen A Bernstein, Jorge F Giani, Masahiro Eriguchi, Tuantuan V Zhao, Romer A Gonzalez-Villalobos, Sebastien Fuchs, George Y Liu, Kenneth E Bernstein
Angiotensin converting enzyme (ACE) inhibitors are widely used to reduce blood pressure. Here, we examined if ACE is important for the antibacterial effectiveness of neutrophils. ACE knockout mice or mice treated with an ACE inhibitor were more susceptible to bacterial infection by methicillin-resistant S. aureus (MRSA). In contrast, mice over expressing ACE in neutrophils (Neu(ACE) mice) have increased resistance to MRSA, and better in vitro killing of MRSA, P. aeruginosa, and K. pneumoniae ACE overexpression increased neutrophil production of reactive oxygen species (ROS) following MRSA challenge, an effect independent of the angiotensin II AT1 receptor...
May 17, 2017: Blood
https://www.readbyqxmd.com/read/28513576/biofilm-is-a-major-virulence-determinant-in-bacterial-colonization-of-chronic-skin-ulcers-independently-from-the-multidrug-resistant-phenotype
#18
Enea Gino Di Domenico, Ilaria Farulla, Grazia Prignano, Maria Teresa Gallo, Matteo Vespaziani, Ilaria Cavallo, Isabella Sperduti, Martina Pontone, Valentina Bordignon, Laura Cilli, Alessandra De Santis, Fabiola Di Salvo, Fulvia Pimpinelli, Ilaria Lesnoni La Parola, Luigi Toma, Fabrizio Ensoli
Bacterial biofilm is a major factor in delayed wound healing and high levels of biofilm production have been repeatedly described in multidrug resistant organisms (MDROs). Nevertheless, a quantitative correlation between biofilm production and the profile of antimicrobial drug resistance in delayed wound healing remains to be determined. Microbial identification, antibiotic susceptibility and biofilm production were assessed in 135 clinical isolates from 87 patients. Gram-negative bacteria were the most represented microorganisms (60...
May 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28513176/selective-inhibition-of-escherichia-coli-rna-and-dna-topoisomerase-i-by-hoechst-33258-derived-mono-and-bisbenzimidazoles
#19
Nihar Ranjan, Sandra Story, Geraldine Fulcrand, Fenfei Leng, Muzammil Ahmad, Ada King, Souvik Sur, Weidong Wang, Yuk-Ching Tse-Dinh, Dev P Arya
A series of Hoechst 33258 based mono- and bisbenzimidazoles have been synthesized and their Escherichia coli DNA topoisomerase I inhibition, binding to B-DNA duplex, and antibacterial activity has been evaluated. Bisbenzimidazoles with alkynyl side chains display excellent E. coli DNA topoisomerase I inhibition properties with IC50 values <5.0 μM. Several bisbenzimidazoles (3, 6, 7, 8) also inhibit RNA topoisomerase activity of E. coli DNA topoisomerase I. Bisbenzimidazoles inhibit bacterial growth much better than monobenzimidazoles for Gram-positive strains...
May 31, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28511708/enzyme-mediated-formulation-of-stable-elliptical-silver-nanoparticles-tested-against-clinical-pathogens-and-mdr-bacteria-and-development-of-antimicrobial-surgical-thread
#20
Rupak Thapa, Chintan Bhagat, Pragya Shrestha, Suvash Awal, Pravin Dudhagara
BACKGROUND: Silver nanoparticles (AgNPs) are believed to be emerging tool against various infectious diseases including multi-drug resistant (MDR) bacteria. In the present study, in vitro synthesis of AgNPs was optimized using 1:50 ratio of macerozyme (25 μg/μl) and 1 mM AgNO3 incubated at 80 °C for 8 h. AgNPs were characterized by UV-Visible spectroscopy, dynamic light scattering (DLS), scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy (TEM) and X-ray diffraction (XRD)...
May 16, 2017: Annals of Clinical Microbiology and Antimicrobials
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