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biofilm antibiotic

Lars Bjørndal, Catharina Amaloo, Merete Markvart, Vibe Rud, Klaus Qvortrup, Camilla Stavnsbjerg, Thomas Bjarnsholt
INTRODUCTION: The aim was to present a case report of a full-length extrusion of an obturator's core carrier into the maxillary sinus, causing clinical symptoms from the nose region with differential diagnostics aspects, which, in turn, led to several surgical treatments of the nostrils before diagnosis and correct endodontic retreatment of a maxillary right first molar. A 36-year-old man presented in 2012 with complaints from the right nostril region. Medical treatment with antibiotics and surgical procedures because of nasal stenosis resulted only in partial improvement...
October 18, 2016: Journal of Endodontics
Ahmed Abdel Megeed, M Ali Hayssam, Mohamed Z M Salem, Mohamed S El-Shikh, Ibrahim Ahmed Talea, Yahya A Alogaibi
Multidrug-resistant (MDR) Acinetobacter baumannii infections are a great public health concern and demand continuous surveillance and antibiotic stewardship. Virulence traits and the pathogenicity of Acinetobacter are less studied compared with the molecular epidemiological and antibiotic resistance profile of this organism. In our present study, we investigated the primary characteristics contributing to the virulence of MDR A. baumannii isolates and compared them with avirulent isolates. A total of 32 well-characterized MDR A...
October 19, 2016: Journal of AOAC International
(no author information available yet)
Pseudomonas aeruginosa is the most common Gram-negative bacterium associated with nosocomial and life-threatening chronic infections in cystic fibrosis patients. This pathogen is well-known for its ability to attach to surfaces of indwelling medical devices to form biofilms, which consist of a regular array of extracellular polymers. Tenaciously bound to the surface of devices and inherently resilient to antibiotic treatment, P. aeruginosa poses a serious threat in clinical medicine and contributes to the persistence of chronic infections...
October 19, 2016: Current Drug Targets
Dharmaprakash Viszwapriya, Ganapathy Ashwinkumar Subramenium, Solai Radhika, Shunmugiah Karutha Pandian
Streptococcus mutans, a multivirulent pathogen is considered the primary etiological agent in dental caries. Development of antibiotic resistance in the pathogen has created a need for novel antagonistic agents which can control the virulence of the organism and reduce resistance development. The present study demonstrates the in vitro anti-virulence potential of betulin (lup-20(29)-ene-3β,28-diol), an abundantly available plant triterpenoid against S. mutans UA159. Betulin exhibited significant dose dependent antibiofilm activity without affecting bacterial viability...
October 18, 2016: Antonie Van Leeuwenhoek
Asim V Farooq, Joshua H Hou, Sarmad Jassim, Zeeshan Haq, Elmer Y Tu, Jose de la Cruz, Maria S Cortina
OBJECTIVES: To determine the rate of biofilm formation on bandage contact lenses worn by patients with the Boston type 1 keratoprosthesis (K-Pro) while on prophylactic topical vancomycin versus linezolid. METHODS: Patients wearing a bandage contact lens (BCL) with a K-Pro were eligible for enrollment. After irrigation of the ocular surface with 5% povidone-iodine solution, each patient was placed on either topical vancomycin 15 mg/mL or linezolid 0.2% BID for one month...
October 13, 2016: Eye & Contact Lens
Charlene Babra Waryah, Kelsi Wells, Dulantha Ulluwishewa, Nigel Chen-Tan, Jully Gogoi-Tiwari, Joshua Ravensdale, Paul Costantino, Anke Gökçen, Andreas Vilcinskas, Jochen Wiesner, Trilochan Mukkur
Staphylococcus aureus in biofilms is highly resistant to the treatment with antibiotics, to which the planktonic cells are susceptible. This is likely to be due to the biofilm creating a protective barrier that prevents antibiotics from accessing the live pathogens buried in the biofilm. S. aureus biofilms consist of an extracellular matrix comprising, but not limited to, extracellular bacterial DNA (eDNA) and poly-β-1, 6-N-acetyl-d-glucosamine (PNAG). Our study revealed that despite inferiority of dispersin B (an enzyme that degrades PNAG) to DNase I that cleaves eDNA, in dispersing the biofilm of S...
October 18, 2016: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
Seshasailam Venkateswaran, Orlando David Henrique Dos Santos, Emma Scholefield, Annamaria Lilienkampf, Peter J Gwynne, David G Swann, Kevin Dhaliwal, Maurice P Gallagher, Mark Bradley
Infections arising from contaminated medical devices are a serious global issue, contributing to antibiotic resistance and imposing significant strain on healthcare systems. Since the majority of medical device-associated infections are biofilm related, efforts are being made to generate either bacteria-repellent or antibacterial coatings aimed at preventing bacterial colonisation. Here, we utilise a nanocapsule mediated slow release of a natural antimicrobial to improve the performance of a bacteria repellent polymer coating...
August 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
Arianna Pompilio, Valentina Crocetta, Dipankar Ghosh, Malabika Chakrabarti, Giovanni Gherardi, Luca Agostino Vitali, Ersilia Fiscarelli, Giovanni Di Bonaventura
The present study was carried out to understand the adaptive strategies developed by Stenotrophomonas maltophilia for chronic colonization of the cystic fibrosis (CF) lung. For this purpose, 13 temporally isolated strains from a single CF patient chronically infected over a 10-year period were systematically characterized for growth rate, biofilm formation, motility, mutation frequencies, antibiotic resistance, and pathogenicity. Pulsed-field gel electrophoresis (PFGE) showed over time the presence of two distinct groups, each consisting of two different pulsotypes...
2016: Frontiers in Microbiology
Santosh Kumar Singh, Seema Kumari, Minakshi Gupta
Escherichia coli mediated urinary tract infection has been reported to be most prevalent among patients of different class, gender and ages. Currently, multidrug resistant E. coli harboring several virulence factors are most perilous threats for patients especially for elders. The aim of this study was to determine the antibiotic resistance pattern, co-resistance and phenotypic virulence factors present in uropathogenic E. coli isolates from aged patients. Thirty-nine E. coli isolates were collected during May-June 2014 from patients aged 50-80 years...
October 12, 2016: Microbial Pathogenesis
Kashif Rahim, Shamim Saleha, Xudong Zhu, Liang Huo, Abdul Basit, Octavio Luiz Franco
A wound is damage of a tissue usually caused by laceration of a membrane, generally the skin. Wound healing is accomplished in three stages in healthy individuals, including inflammatory, proliferative, and remodeling stages. Healing of wounds normally starts from the inflammatory phase and ends up in the remodeling phase, but chronic wounds remain in an inflammatory stage and do not show progression due to some specific reasons. Chronic wounds are classified in different categories, such as diabetic foot ulcer (DFU), venous leg ulcers (VLU) and pressure ulcer (PU), surgical site infection (SSI), abscess, or trauma ulcers...
October 14, 2016: Microbial Ecology
Dragica Spasojević, Danica Zmejkoski, Jasmina Glamočlija, Miloš Nikolić, Marina Soković, Verica Milošević, Ivana Jarić, Marijana Stojanović, Emilija Marinković, Talin Barisani-Asenbauer, Radivoje Prodanović, Miloš Jovanović, Ksenija Radotić
Nowadays bacterial resistance to known antibiotics is a serious health problem. In order to achieve more efficient treatment, lately there is an effort to find new substances, such as certain biomaterials, that are non-toxic to humans with antibiotic potential. Lignins and lignin-derived compounds have been proposed to be good candidates for use in medicine and health maintenance. In this study, the antibacterial activity of the lignin model polymer dehydrogenate polymer (DHP) in alginate hydrogel (Alg) was studied...
September 30, 2016: International Journal of Antimicrobial Agents
Jin Xiao, Yonghwi Moon, Lihua Li, Elena Rustchenko, Hironao Wakabayashi, Xiaoyi Zhao, Changyong Feng, Steven R Gill, Sean McLaren, Hans Malmstrom, Yanfang Ren, Robert Quivey, Hyun Koo, Dorota T Kopycka-Kedzierawski
INTRODUCTION: Candida albicans has been detected together with Streptococcus mutans in high numbers in plaque-biofilm from children with early childhood caries (ECC). The goal of this study was to examine the C. albicans carriage in children with severe early childhood caries (S-ECC) and the maternal relatedness. METHODS: Subjects in this pilot cross-sectional study were recruited based on a convenient sample. DMFT(S)/dmft(s) caries and plaque scores were assessed during a comprehensive oral exam...
2016: PloS One
Zahid Iqbal, Mohamed N Seleem, Hafiz Iftikhar Hussain, Lingli Huang, Haihong Hao, Zonghui Yuan
Several studies have been conducted to check the prevalence of methicillin-resistant strains of Staphylococcus aureus (MRSA) in animals and animal-derived food products but limited data are available regarding their virulence and associated gene expression profile. In the present study, antibiotic resistance and virulence of MRSA and methicillin-sensitive S. aureus animal isolates were determined in vitro by agar dilution, biofilm formation, adhesion, invasion and intracellular survivability assays. In addition, the pathogenicity of these isolates was examined in a murine model of S...
October 14, 2016: Scientific Reports
Maren Seitz, Peter Valentin-Weigand, Jörg Willenborg
Use of antimicrobial agents in veterinary medicine is essential to control infectious diseases, thereby keeping animals healthy and animal products safe for the consumer. On the other hand, development and spread of antimicrobial resistance is of major concern for public health. Streptococcus (S.) suis reflects a typical bacterial pathogen in modern swine production due to its facultative pathogenic nature and wide spread in the pig population. Thus, in the present review we focus on certain current aspects and problems related to antimicrobial use and resistance in S...
October 15, 2016: Current Topics in Microbiology and Immunology
Talerngsak Kanjanabuch, Nuttha Lumlertgul, Lachlan J Pearson, Tanittha Chatsuwan, Krit Pongpirul, Asada Leelahavanichkul, Nisa Thongbor, Gunticha Nuntawong, Laksamon Praderm, Pantiwa Wechagama, Surapong Narenpitak, Apinya Wechpradit, Worauma Punya, Guttiga Halue, Phetpailin Naka, Somboon Jeenapongsa, Somchai Eiam-Ong
♦ Background: Melioidosis, an infectious disease caused by Burkholderia pseudomallei, is endemic in Southeast Asia and Northern Australia. Although a wide range of clinical manifestations from this organism are known, peritonitis associated with peritoneal dialysis (PD) has rarely been reported. ♦ Patients and Methods: Peritoneal dialysis patients from all regions in Thailand were eligible for the study if they had peritonitis and either peritoneal fluid or effluent culture positive for B.pseudomallei Patient data obtained included baseline characteristics, laboratory investigations, treatments, and clinical outcomes...
October 13, 2016: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
Yenis M Gutierrez-Murgas, Gwenn Skar, Danielle Ramirez, Matthew Beaver, Jessica N Snowden
BACKGROUND: Shunt infection is a frequent and serious complication in the surgical treatment in hydrocephalus. Previous studies have shown an attenuated immune response to these biofilm-mediated infections. We proposed that IL-10 reduces the inflammatory response to Staphylococcus epidermidis (S. epidermidis) CNS catheter infection. METHODS: In this study, a murine model of catheter-associated S. epidermidis biofilm infection in the CNS was generated based on a well-established similar model for S...
October 13, 2016: Journal of Neuroinflammation
Maryam Banar, Mohammad Emaneini, Mhboubeh Satarzadeh, Nafiseh Abdellahi, Reza Beigverdi, Willem B van Leeuwen, Fereshteh Jabalameli
Biofilm is an important virulence factor in Pseudomonas aeruginosa and has a substantial role in antibiotic resistance and chronic burn wound infections. New therapeutic agents against P. aeruginosa, degrading biofilms in burn wounds and improving the efficacy of current antimicrobial agents, are required. In this study, the effects of α-mannosidase, β-mannosidase and trypsin enzymes on the degradation of P. aeruginosa biofilms and on the reduction of ceftazidime minimum biofilm eliminating concentrations (MBEC) were evaluated...
2016: PloS One
Wei Chen, Bei Li, Shuai Li, Yi-Wen Ou, Qin Ou
<strong>Objective</strong> To explore the effects of Scutellaria baicalensis on activity and biofilm formation of Klebsiella pneumonia (Kp).<strong>Methods</strong> The broth and agar dilution Methods were carried out to determine minimum inhibitory concentration and minimum bactericidal concentration of Scutellaria baicalensis for TW518. VITEK-32 system was used to assay TW518 susceptibility to antibiotics. Kp biofilms were formed in vitro and stained with BacLight Live/Dead stain. The class integron geneⅠ1 mRNA expression was analyzed with RT-PCR...
September 20, 2016: Chinese Medical Sciences Journal, Chung-kuo i Hsüeh K'o Hsüeh Tsa Chih
Andreas Thomann, Christian Brengel, Carsten Börger, Dagmar Kail, Anke Steinbach, Martin Empting, Rolf W Hartmann
Drug-resistant Pseudomonas aeruginosa (PA) strains are on the rise, making treatment with current antibiotics ineffective. Hence, circumventing resistance or restoring the activity of antibiotics by novel approaches is of high demand. Targeting the Pseudomonas quinolone signal quorum sensing (PQS-QS) system is an intriguing strategy to abolish PA pathogenicity without affecting the viability of the pathogen. Herein we report the structure-activity relationships of 2-sulfonylpyrimidines, which were previously identified as dual-target inhibitors of the PQS receptor PqsR and the PQS synthase PqsD...
October 12, 2016: ChemMedChem
Suresh Sadhasivam, Sekar Palanivel, Shamik Ghosh
Antimicrobials from natural sources have gained immense importance in recent times to combat the global challenge of antibiotic resistance. Essential oils are implicated in antimicrobial action against several species. Here we have screened nine commercially available essential oils for their antimicrobial activity against organisms associated with skin, scalp and nail infections mainly Propionibacterium acnes, Malassezia spp, Candida albicans and Trichophyton spp. Among nine essential oils, B. serrata essential oil demonstrated superior antimicrobial activity against all the microorganisms and surprisingly it showed maximum activity against Trichophyton spp...
October 12, 2016: Letters in Applied Microbiology
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