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https://www.readbyqxmd.com/read/29045678/enterococcus-faecalis-modulates-immune-activation-and-slows-healing-during-wound-infection
#1
Kelvin Kian Long Chong, Wei Hong Tay, Baptiste Janela, Adeline Mei Hui Yong, Tze Horng Liew, Leigh Madden, Damien Keogh, Timothy Mark Sebastian Barkham, Florent Ginhoux, David Laurence Becker, Kimberly A Kline
Enterococcus faecalis is one of most frequently isolated bacterial species in wounds yet little is known about its pathogenic mechanisms in this setting. Here, we used a mouse wound excisional model to characterize the infection dynamics of E. faecalis and show that infected wounds result in two different states depending on the initial inoculum. Low dose inocula were associated with short term, low titer colonization whereas high dose inocula were associated with acute bacterial replication and long term persistence...
October 17, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29044373/antimicrobial-resistance-a-one-health-perspective
#2
Laura H Kahn
Introduction: Worsening antimicrobial resistance (AMR) threatens the practice of modern human and veterinary medicine. For decades, medicine and agriculture have blamed each other for the rise of resistant microbes. Widespread use and misuse of antibiotics in both medicine and agriculture have increased the prevalence and expression of resistance genes. VRE: The rise of vancomycin-resistant Enterococcus faecium (VRE) in the European Union (EU) led to the ban of avoparcin, an antibiotic that is chemically related to vancomycin...
June 1, 2017: Transactions of the Royal Society of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29043959/purified-citritin-in-combination-with-vancomycin-inhibits-vre-in-vitro-and-in-vivo
#3
Kléber de Sousa Oliveira, Paulo Roberto Martins Queiroz, Isabel Cristina Marques Fensterseifer, Ludovico Migliolo, Aline Lima Oliveira, Octávio Luiz Franco
Gram-positive pathogens such as methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococcus faecium (VRE) have been frequently associated with bacterial resistance mechanisms. These mechanisms, in turn, restrict a range of therapeutic opportunities for the treatment of infections caused by these micro-organisms. Faced with this problem, the present study aims to isolate and characterize molecules with antimicrobial activity derived from the fungus Penicillium citrinum isolated from Cerrado soil...
October 18, 2017: Microbiology
https://www.readbyqxmd.com/read/29043145/anca-associated-pauci-immune-glomerulonephritis-in-a-patient-with-bacterial-endocarditis-a-challenging-clinical-dilemma
#4
Andrea Cervi, Dylan Kelly, Iakovina Alexopoulou, Nader Khalidi
PURPOSE: We report the case of a 59-year-old man with chronic hepatitis B and C infection presenting with acute kidney injury and enterococcus faecalis-infective endocarditis (IE). An elevated proteinase-3 (PR3)-ANCA and pauci-immune glomerulonephritis (GN) on renal biopsy were discovered, corresponding to ANCA-mediated GN. We conducted a literature review to assess the role of ANCA in IE and treatment implications. METHODS: On systematic review of the literature, we found five previous cases whereby IE caused by streptococcus and bartonella species were related to ANCA vasculitis-associated GN...
2017: Clin Nephrol Case Stud
https://www.readbyqxmd.com/read/29040077/influence-of-pathogenic-bacterial-activity-on-growth-of-scenedesmus-sp-and-removal-of-nutrients-from-public-market-wastewater
#5
A A Al-Gheethi, R M Mohamed, N M Jais, A N Efaq, Abdullah Abd Halid, A A Wurochekke, M K Amir-Hashim
The present study aims to investigate the influence of Staphylococcus aureus, Escherichia coli and Enterococcus faecalis in public market wastewater on the removal of nutrients in terms of ammonium (NH4(-)) and orthophosphate (PO4(3)) using Scenedesmus sp. The removal rates of NH4(-) and orthophosphate PO4(3-) and batch kinetic coefficient of Scenedesmus sp. were investigated. The phycoremediation process was carried out at ambient temperature for 6 days. The results revealed that the pathogenic bacteria exhibited survival potential in the presence of microalgae but they were reduced by 3-4 log at the end of the treatment process...
October 2017: Journal of Water and Health
https://www.readbyqxmd.com/read/29039290/simulated-use-polytetrafluorethylene-biofilm-model-repeated-rounds-of-complete-reprocessing-lead-to-accumulation-of-organic-debris-and-viable-bacteria
#6
Michelle J Alfa, Harminder Singh, Zoann Nugent, Donald Duerksen, Gale Schultz, Carol Reidy, Pat DeGagne, Nancy Olson
OBJECTIVE Biofilm has been implicated in bacterial persistence and survival after endoscope reprocessing. In this study, we assessed the impact of different methods of reprocessing on organic residues and viable bacteria after repeated rounds of biofilm formation when each was followed by full reprocessing. METHODS ATS-2015, an artificial test soil containing 5-8 Log10 colony-forming units (CFU) of Enterococcus faecalis and Pseudomonas aeruginosa, was used to form biofilm in polytetrafluroethylene channels overnight on 5 successive days...
October 17, 2017: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/29038503/gastric-acid-suppression-promotes-alcoholic-liver-disease-by-inducing-overgrowth-of-intestinal-enterococcus
#7
Cristina Llorente, Peter Jepsen, Tatsuo Inamine, Lirui Wang, Sena Bluemel, Hui J Wang, Rohit Loomba, Jasmohan S Bajaj, Mitchell L Schubert, Masoumeh Sikaroodi, Patrick M Gillevet, Jun Xu, Tatiana Kisseleva, Samuel B Ho, Jessica DePew, Xin Du, Henrik T Sørensen, Hendrik Vilstrup, Karen E Nelson, David A Brenner, Derrick E Fouts, Bernd Schnabl
Chronic liver disease is rising in western countries and liver cirrhosis is the 12th leading cause of death worldwide. Simultaneously, use of gastric acid suppressive medications is increasing. Here, we show that proton pump inhibitors promote progression of alcoholic liver disease, non-alcoholic fatty liver disease, and non-alcoholic steatohepatitis in mice by increasing numbers of intestinal Enterococcus spp. Translocating enterococci lead to hepatic inflammation and hepatocyte death. Expansion of intestinal Enterococcus faecalis is sufficient to exacerbate ethanol-induced liver disease in mice...
October 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/29038276/reduced-chlorhexidine-and-daptomycin-susceptibility-in-vancomycin-resistant-enterococcus-faecium-after-serial-chlorhexidine-exposure
#8
Pooja Bhardwaj, Amrita Hans, Kinnari Ruikar, Ziqiang Guan, Kelli L Palmer
Vancomycin-resistant Enterococcus faecium (VREfm) are critical public health concerns because they are among the leading causes of hospital-acquired bloodstream infections. Chlorhexidine (CHX) is a bisbiguanide cationic antiseptic that is routinely used for patient bathing and other infection control practices. VREfm are likely frequently exposed to CHX; however, the long-term effects of CHX exposure have not been studied in enterococci. In this study, we serially exposed VREfm to increasing concentrations of CHX for a period of 21 days in two independent experimental evolution trials...
October 16, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29038125/modulators-of-enterococcus-faecalis-cell-envelope-integrity-and-antimicrobial-resistance-influence-stable-colonization-of-the-mammalian-gastrointestinal-tract
#9
Ismael L Banla, Sushma Kommineni, Michael Hayward, Marinelle Rodrigues, Kelli L Palmer, Nita H Salzman, Christopher J Kristich
The Gram-positive bacterium Enterococcus faecalis is both a colonizer of the gastrointestinal tract (GIT) and an agent of serious nosocomial infections. Although typically required for pathogenesis, GIT colonization by E. faecalis is poorly understood. E. faecalis tolerates high concentrations of GIT antimicrobials like cholate and lysozyme, leading us to hypothesize that resistance to intestinal antimicrobials is essential for long-term GIT colonization. Analyses of E. faecalis mutants exhibiting defects in antimicrobial resistance revealed that IreK, a determinant of envelope integrity and antimicrobial resistance, is required for long-term GIT colonization...
October 16, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29037505/in-vitro-antimicrobial-and-antimycobacterial-activity-and-hplc-dad-screening-of-phenolics-from-chenopodium-ambrosioides-l
#10
Roberta S Jesus, Mariana Piana, Robson B Freitas, Thiele F Brum, Camilla F S Alves, Bianca V Belke, Natália Jank Mossmann, Ritiel C Cruz, Roberto C V Santos, Tanise V Dalmolin, Bianca V Bianchini, Marli M A Campos, Liliane de Freitas Bauermann
The main objective of this study was to demonstrate the antimicrobial potential of the crude extract and fractions of Chenopodium ambrosioides L., popularly known as Santa-Maria herb, against microorganisms of clinical interest by the microdilution technique, and also to show the chromatographic profile of the phenolic compounds in the species. The Phytochemical screening revealed the presence of cardiotonic, anthraquinone, alkaloids, tannins and flavonoids. The analysis by HPLC-DAD revealed the presence of rutin in the crude extract (12...
July 19, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/29037164/local-epidemiology-and-resistance-profiles-in-acute-uncomplicated-cystitis-auc-in-women-a-prospective-cohort-study-in-an-urban-urological-ambulatory-setting
#11
Michael Seitz, Christian Stief, Raphaela Waidelich
BACKGROUND: Acute uncomplicated cystitis (AUC) is a common ailment in the urological setting. Guidelines for urinary tract infections are based on large-scale multi-centre, epidemiological and international studies. The objective of this observational study was to establish whether the results of a multi-centre study on the resistance profile of Escherichia coli (E. coli) in patients with AUC could be directly applied to an urological practice in a major European city or whether there are divergences in the resistance profile...
October 16, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29034579/rotary-versus-reciprocating-shaping-files-in-bacterial-elimination-from-long-oval-canals
#12
Andreas Krokidis, Carlo Bonfanti, Antonio C Cerutti, Nicola Barabanti, Panos Panopoulos
A comparison of the abilities of rotary versus reciprocating files to eliminate viable Enterococcus faecalis populations from the long oval root canals of extracted human teeth. Fifty teeth were contaminated and randomly distributed into two groups (n = 25 each): BT-RaCe group and WaveOne group. Two microbial samples were obtained from each tooth before (S1) and after (S2) instrumentation. The CFUs from the S1 and S2 measurements were calculated and compared between the groups. Both groups showed significantly fewer CFUs in the S2 samples (P < 0...
October 16, 2017: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
https://www.readbyqxmd.com/read/29034570/efficacy-of-different-carriers-for-the-triple-antibiotic-powder-during-regenerative-endodontic-procedures
#13
David Hwang, Hanson Fong, James D Johnson, Avina Paranjpe
Chemical debridement during Regenerative Endodontic procedures is important. Previous research studies have evaluated various antibiotics and their concentrations but none have addressed the concern of delivering these materials. Hence, the purpose of this study was to determine what carrier could be used effectively in a clinical setting. Sixty caries-free maxillary incisors were used and inoculated with Enterococcus faecalis and divided into positive and irrigation controls and experimental groups that had triple antibiotic powder (1:1:1 ciprofloxacin:metronidazole:minocycline) delivered using various carriers: saline, cotton, sponge and methylcellulose...
October 16, 2017: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
https://www.readbyqxmd.com/read/29032227/effectiveness-of-photodynamic-therapy-associated-with-irrigants-over-two-biofilm-models
#14
Ricardo Abreu da Rosa, Manuela Favarin Santini, José Antônio Poli de Figueiredo, Fernanda Visioli, Jefferson Ricardo Pereira, Rodrigo Ricci Vivan, Francisco Montagner, Marcus Vinícius Reis Só
BACKGROUND: This study aimed to evaluate the antibacterial effect and the biofilm disruption promoted by antimicrobial photodynamic therapy (aPDT) associated with sodium hypochlorite (NaOCl) and chlorexidine (CHX) over monospecies and multispecies biofilms. METHODS: In monospecies model, forty-six premolars were inoculated with Enterococcus faecalis for 21days and divided into three groups: saline, CHX and NaOCl. After irrigation, aPDT was performed. Samples were collected at baseline (S1) and after irrigation (S2) and aPDT (S3)...
October 12, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/29031863/validation-of-healthcare-associated-infection-surveillance-in-smaller-australian-hospitals
#15
A Hoskins, L J Worth, N Imam, S A Johnson, A Bull, M J Richards, N Bennett
A validation study was conducted in smaller (<100 acute beds) Victorian hospitals to evaluate case-detection for Staphylococcus aureus bloodstream (SAB), methicillin-resistant S. aureus (MRSA) and vancomycin-resistant Enterococcus (VRE) infections. Overall, 142 infections were identified in 20 hospitals. For routine surveillance of SAB events sensitivity was 74.4% and specificity was 100.0%. For MRSA infections, sensitivity was 47.5% and specificity was 90.9%. All confirmed VRE infections were correctly reported...
October 12, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/29031240/colonization-of-oropharynx-and-lower-respiratory-tract-in-critical-patients-risk-of-ventilator-associated-pneumonia
#16
Ivany Machado de Carvalho Baptista, Frederico Canato Martinho, Gustavo Giacomelli Nascimento, Carlos Eduardo da Rocha Santos, Renata Falchete do Prado, Marcia Carneiro Valera
OBJECTIVE: To investigate the microbial diversity existing in oral cavity and respiratory tract samples (from mini-bronchoalveolar lavage (BAL), endotracheal aspirate, and orotracheal tube) of patients on mechanical ventilation by using the checkerboard DNA-DNA hybridisation. Also, the study aimed to evaluate whether the microbial profile in the oral cavity is found in respiratory tract samples, at different periods of mechanical ventilation time (12h, 48h, 96h) in attempt to identification of relationship between VAP (ventilator-associated pneumonia) and bacterial species studied...
October 2, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/29030859/outpatient-parenteral-antimicrobial-therapy-in-enterococcus-faecalis-infective-endocarditis
#17
M V Gil-Navarro, L E Lopez-Cortes, R Luque-Marquez, J Galvez-Acebal, A de Alarcon-Gonzalez
WHAT IS KNOWN AND OBJECTIVE: Enterococcus faecalis is the third most common causal agent of infective endocarditis. Currently, the treatment recommended is a combination of ampicillin (2 g/4 h) plus ceftriaxone (2 g/12 h), so patients must remain hospitalized for almost 6 weeks to receive the treatment. They are not generally included in outpatient parenteral antimicrobial therapy programs because 2 different electronic pumps are required to administer these 2 antibiotics. To enable the treatment of patients with E...
October 13, 2017: Journal of Clinical Pharmacy and Therapeutics
https://www.readbyqxmd.com/read/29030448/prevalence-and-antimicrobial-resistance-of-enterococci-isolated-from-retail-meats-in-the-united-states-2002-2014
#18
Gregory H Tyson, Epiphanie Nyirabahizi, Emily Crarey, Claudine Kabera, Claudia Lam, Crystal Rice-Trujillo, Patrick F McDermott, Heather Tate
Bacteria of the genus Enterococcus are important human pathogens that are frequently resistant to a number of clinically important antibiotics. They are also used as a marker of animal fecal contamination of human foods, and are employed as sentinel organisms for tracking trends in resistance to antimicrobials with gram-positive activity. As part of the National Antimicrobial Resistance Monitoring System (NARMS), we evaluated several retail meat commodities for the presence of enterococci from 2002-2014, finding 92...
October 13, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29030312/antimicrobial-resistance-of-enterococcus-spp-isolated-from-thai-fermented-pork-in-chiang-rai-province-thailand
#19
Kamonnaree Chotinantakul, Nittaya Chansiw, Seiji Okada
OBJECTIVES: The aim of this study is to evaluate the prevalence of resistant phenotypes and genes of Enterococcus spp. to explore the range of resistant profiles from Thai traditional fermented pork. METHODS: A total of 120 Thai fermented pork specimens in Chiang Rai, Thailand were collected and antimicrobial resistance was identified using 11 antimicrobial agents in enterococcal isolates, via an agar disk diffusion method. The antibiotic resistant genes from resistant phenotypes and virulence genes were observed...
October 10, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29029072/detection-of-optra-in-the-african-continent-tunisia-within-a-mosaic-enterococcus-faecalis-plasmid-from-urban-wastewaters
#20
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
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