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https://www.readbyqxmd.com/read/27911410/experimental-infection-with-listeria-monocytogenes-as-a-model-for-studying-host-interferon-%C3%AE-responses
#1
Jeeyoon Jennifer Ahn, Thirumahal Selvanantham, Monan Angela Zhang, Thierry Mallevaey, Shannon E Dunn
L. monocytogenes is a gram-positive bacterium that is a cause of food borne disease in humans. Experimental infection of mice with this pathogen has been highly informative on the role of innate and adaptive immune cells and specific cytokines in host immunity against intracellular pathogens. Production of IFN-γ by innate cells during sublethal infection with L. monocytogenes is important for activating macrophages and early control of the pathogen(1-3). In addition, IFN-γ production by adaptive memory lymphocytes is important for priming the activation of innate cells upon reinfection(4)...
November 16, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27910939/real-time-pcr-based-serotyping-of-streptococcus-agalactiae
#2
Kathleen M Breeding, Bhavana Ragipani, Kun-Uk David Lee, Martin Malik, Tara M Randis, Adam J Ratner
Group B Streptococcus (GBS) is an encapsulated, gram-positive pathogen that is an important cause of neonatal invasive infections, including sepsis and meningitis. There are ten known GBS serotypes based on distinct capsule compositions (Ia, Ib, II-IX), and current candidate capsular polysaccharide conjugate vaccines target only a subset of these. Serotyping of GBS isolates is important for understanding local epidemiology and for monitoring for serotype replacement or capsular switching. However, serotyping generally requires either latex agglutination, multiplex PCR with analysis of band sizes, or analysis of whole genome sequences-all techniques that are either expensive or not widely available...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910828/biofilm-prevention-of-gram-negative-bacterial-pathogens-involved-in-periprosthetic-infection-by-antibiotic-loaded-calcium-sulfate-beads-in-vitro
#3
Robert P Howlin, Christopher Winnard, Connor J Frapwell, Jeremy S Webb, John J Cooper, Sean S Aiken, Paul Stoodley
Biofilm formation represents a key stage in the pathogenesis of prosthetic infections (PIs). More tolerant to antibiotics than their planktonic counterparts, biofilm bacteria are difficult to eradicate using conventional therapeutic regimes. A common approach in PI management is the adjunctive use of localised antibiotics in addition to systemic administration in an attempt to protect the implant from colonisation by infiltrating bacteria. This study evaluates the antibacterial and antibiofilm efficacy of antibiotic-loaded dissolvable calcium sulphate, previously shown to be effective against key gram-positive pathogens, against gram-negative species important in the establishment of chronic infection in PIs...
December 2, 2016: Biomedical Materials
https://www.readbyqxmd.com/read/27908697/clostridium-difficile-carriage-in-adult-cystic-fibrosis-cf-implications-for-patients-with-cf-and-the-potential-for-transmission-of-nosocomial-infection
#4
D G Burke, M J Harrison, C Fleming, M McCarthy, C Shortt, I Sulaiman, D M Murphy, J A Eustace, F Shanahan, C Hill, C Stanton, M C Rea, R P Ross, B J Plant
Clostridium difficile is an anaerobic Gram-positive, spore-forming, toxin-producing bacillus transmitted among humans through the faecal-oral route. Despite increasing carriage rates and the presence of C. difficile toxin in stool, patients with CF rarely appear to develop typical manifestations of C. difficile infection (CDI). In this study, we examined the carriage, toxin production, ribotype distribution and antibiotic susceptibility of C. difficile in a cohort of 60 adult patients with CF who were pre-lung transplant...
November 29, 2016: Journal of Cystic Fibrosis: Official Journal of the European Cystic Fibrosis Society
https://www.readbyqxmd.com/read/27908581/sonodynamic-inactivation-of-gram-positive-and-gram-negative-bacteria-using-a-rose-bengal-antimicrobial-peptide-conjugate
#5
David Costley, Heather Nesbitt, Nigel Ternan, James Dooley, Ying-Ying Huang, Michael R Hamblin, Anthony P McHale, John F Callan
Combating antimicrobial resistance is one of the most serious public health challenges facing society today. The development of new antibiotics or alternative techniques that can help combat antimicrobial resistance is being prioritised by many governments and stakeholders across the globe. Antimicrobial photodynamic therapy is one such technique that has received considerable attention but is limited by the inability of light to penetrate through human tissue, reducing its effectiveness when used to treat deep-seated infections...
November 17, 2016: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/27908405/biosynthesis-of-selenium-nanoparticles-using-enterococcus-faecalis-and-evaluation-of-their-antibacterial-activities
#6
Sara Shoeibi, Mohammad Mashreghi
Microorganisms are capable of synthesizing metal nanoparticles, and specifically Enterococcus faecalis bacteria were tested for its ability to synthesize selenium nanoparticles (Se-NPs) from sodium selenite. The biosynthesized Se-NPs were spherical in shape with the size range of 29-195nm. Also, the TEM microscopy showed the accumulation of nano-structures as extracellular deposits. The ability of the bacteria to tolerate high levels of toxic selenite was studied by changing with different concentrations of sodium selenite (0...
January 2017: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/27905283/comparative-analysis-of-serum-mineral-levels-and-parasite-load-in-goats-naturally-infected-with-gastrointestinal-nematodes
#7
Serap Ünübol Aypak, Süleyman Aypak, Hüseyin Voyvoda, Gülşen Güven, Evrim Dereli Fidan, Gamze Tosun, Mehmet Gültekin, Emrah Şimşek, Asude Gülçe Güler
OBJECTIVE: This study aimed to investigate the relationship between serum mineral levels and parasite load in Saanen (n=37) and Damascus (n=13) goats, which were all approximately 2 months pregnant and naturally infected with gastrointestinal nematodes. METHODS: To determine parasite concentration individually, fecal samples were taken from each goat, and the eggs per gram (EPG) of feces was detected via a modified McMaster technique. To investigate the possible effects of parasite concentration on serum mineral levels, blood was drawn from the goats and serum calcium, phosphorus, magnesium, iron, copper, zinc, manganese, nickel, and cadmium levels were measured via the ICP-OES technique...
September 2016: Türkiye Parazitolojii Dergisi
https://www.readbyqxmd.com/read/27904882/first-case-of-actinomycetoma-in-france-due-to-a-novel-nocardia-species-nocardia-boironii-sp-nov
#8
Jacques M Gilquin, Brigitte Riviere, Valme Jurado, Bernard Audouy, Jean-Baptiste Kouatche, Emmanuelle Bergeron, Delphine Mouniée, Thierry Molina, Philippe Faure, Cesáreo Saiz-Jimenez, Verónica Rodríguez-Nava
Bacterial mycetoma is a neglected disease mainly observed in tropical area countries and typically associated with rural conditions, making its presence in developed countries of temperate climate areas rare. However, we report the first case of an autochthonous mycetoma case in continental France that originated from a new Nocardia species. A Gram-positive filamentous bacterium (OFN 14.177(T)) was isolated from a pus sample from the mycetoma of a male French patient 92 years old suffering from chronic lymphocytic leukemia...
November 2016: MSphere
https://www.readbyqxmd.com/read/27904585/serum-procalcitonin-levels-distinguish-gram-negative-bacterial-sepsis-from-gram-positive-bacterial-and-fungal-sepsis
#9
Shuhua Li, Hengmo Rong, Qinliang Guo, Yifei Chen, Guqing Zhang, Jiong Yang
BACKGROUND: Serum procalcitonin (PCT) levels differ in patients with bacterial or fungal infections and are significantly elevated in patients with Gram-negative bacteremia. We evaluated the diagnostic accuracy of different inflammatory markers to discriminate sepsis caused by different pathogens. MATERIALS AND METHODS: We included 328 episodes of bacteremia from 292 patients with sepsis and 31 patients with suspected sepsis in this study. Medical records of patients who had bacteremia caused by Gram-negative bacteria (Gram-negative), Gram-positive bacteria (Gram-positive) or fungi were reviewed, and information about PCT and other inflammatory markers was recorded...
2016: Journal of Research in Medical Sciences: the Official Journal of Isfahan University of Medical Sciences
https://www.readbyqxmd.com/read/27902921/complete-genome-sequence-of-fictibacillus-arsenicus-g25-54-a-strain-with-toxicity-to-nematodes
#10
Ziqiang Zheng, Jinshui Zheng, Donghai Peng, Ming Sun
Root-knot nematodes (RKNs) can infect almost all crops and cause huge economic losses in agriculture worldwide. An in-depth understanding of bacteria with nematicidal activity is essential for an effective and environmentally friendly control of RKNs. Fictibacillus arsenicus G25-54, a gram-positive and spore-forming bacterium isolated from a submerged sand bank, shows nematicidal activity against free-living Caenorhabditis elegans and RKNs. Here, we report the complete genome of F. arsenicus G25-54, which contains a circular chromosome and encodes ten potential nematicidal factors with twelve secondary metabolite gene clusters...
November 27, 2016: Journal of Biotechnology
https://www.readbyqxmd.com/read/27902417/lantibiotics-produced-by-actinobacteria-and-their-potential-applications-a-review
#11
Karen Gomes, Rafael Silva Duarte, Maria do Carmo de Freire Bastos
The phylum Actinobacteria, which comprises a great variety of Gram-positive bacteria with a high G+C content in their genomes, is known for its large production of bioactive compounds, including those with antimicrobial activity. Among the antimicrobials, bacteriocins, ribosomally-synthesized peptides, represent an important arsenal of potential new drugs to face the increasing prevalence of resistance to antibiotics among microbial pathogens. The actinobacterial bacteriocins form a heterogeneous group of substances that is difficult to adapt to most proposed classification schemes...
November 22, 2016: Microbiology
https://www.readbyqxmd.com/read/27902286/macrococcus-canis-sp-nov-a-skin-bacterium-associated-with-infections-in-dogs
#12
Stefanie Gobeli Brawand, Kerstin Cotting, Elena Gómez-Sanz, Alexandra Collaud, Andreas Thomann, Isabelle Brodard, Sabrina Rodriguez Campos, Christian Strauss, Vincent Perreten
Gram-stain positive cocci were isolated from miscellaneous sites of the skin of healthy dogs as well as from infection sites in dogs. The closest relative by sequencing of the 16S rRNA was Macrococcus caseolyticus with 99.7% sequence identity, but compared to M. caseolyticus, the novel strains shared only 90.8% to 93.5% DNA identity to cpn60, dnaJ, rpoB, and sodA partial genes, respectively. The two species also exhibited other phenotypic characteristics and the majority displayed a visible haemolysis on sheep blood agar, while M...
November 16, 2016: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/27899152/the-anti-staphylococcus-aureus-activity-of-the-phenanthrene-fraction-from-fibrous-roots-of-bletilla-striata
#13
Jing-Jing Guo, Bin-Ling Dai, Ni-Pi Chen, Li-Xia Jin, Fu-Sheng Jiang, Zhi-Shan Ding, Chao-Dong Qian
BACKGROUND: Bletillae Rhizoma, the tuber of Bletilla striata, has been used in Chinese traditional medicine to treat infectious diseases. Chemical studies indicated that phenanthrene was one of the most important components of the herb, with a broad spectrum of antibiotic activity against Gram-positive bacteria. The objective of this study was to further characterize the antibacterial activity of the phenanthrene fraction from the fibrous root of the pseudobulb of B. striata. METHODS: The phenanthrene fraction (EF60) from the ethanol extract of fibrous roots of Bletilla striata pseudobulbs was isolated using polyamide column chromatography...
November 29, 2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27898578/risk-classification-for-enteroviral-infection-in-children-with-meningitis-and-negative-gram-stain
#14
Ramia Zakhour, Elizabeth Aguilera, Rodrigo Hasbun, Susan H Wootton
OBJECTIVES: Enterovirus is the most common cause of aseptic meningitis in children. This study aimed at identifying baseline variables associated with a positive cerebrospinal fluid (CSF) Enterovirus polymerase chain reaction (PCR) to aid clinicians in targeting patients who could be tested and treated as outpatients. METHODS: We performed a retrospective review of children (2 months to 17 years old) admitted to the Children's Memorial Hermann Hospital in Houston, TX, between January 2005 and December 2010 with symptoms of meningitis, CSF white cell count of greater than 5 cells/mm, and a negative CSF Gram stain, who had a CSF Enterovirus PCR...
November 24, 2016: Pediatric Emergency Care
https://www.readbyqxmd.com/read/27897220/impact-of-the-microbial-derived-short-chain-fatty-acid-propionate-on-host-susceptibility-to-bacterial-and-fungal-infections-in-vivo
#15
Eleonora Ciarlo, Tytti Heinonen, Jacobus Herderschee, Craig Fenwick, Matteo Mombelli, Didier Le Roy, Thierry Roger
Short chain fatty acids (SCFAs) produced by intestinal microbes mediate anti-inflammatory effects, but whether they impact on antimicrobial host defenses remains largely unknown. This is of particular concern in light of the attractiveness of developing SCFA-mediated therapies and considering that SCFAs work as inhibitors of histone deacetylases which are known to interfere with host defenses. Here we show that propionate, one of the main SCFAs, dampens the response of innate immune cells to microbial stimulation, inhibiting cytokine and NO production by mouse or human monocytes/macrophages, splenocytes, whole blood and, less efficiently, dendritic cells...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27896598/bacterial-and-fungal-biofilm-formation-on-anodized-titanium-alloys-with-fluorine
#16
Concepcion Perez-Jorge, Maria-Angeles Arenas, Ana Conde, Juan-Manuel Hernández-Lopez, Juan-Jose de Damborenea, Steve Fisher, Alessandra M Agostinho Hunt, Jaime Esteban, Garth James
Orthopaedic device-related infections are closely linked to biofilm formation on the surfaces of these devices. Several modified titanium (Ti-6Al-4V) surfaces doped with fluorine were studied in order to evaluate the influence of these modifications on biofilm formation by Gram-positive and Gram-negative bacteria as well as a yeast. The biofilm studies were performed according to the standard test method approved by ASTM (Designation: E2196-12) using the Rotating Disk Reactor. Four types of Ti-6Al-4V samples were tested; chemically polished (CP), two types of nanostructures containing fluorine, nanoporous (NP) and nanotubular (NT), and non-nanostructured fluorine containing samples (fluoride barrier layers, FBL)...
January 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/27894963/longitudinal-surveillance-on-antibiogram-of-important-gram-positive-pathogens-in-southern-china-2001-to-2015
#17
Zhenbo Xu, Jinhong Xie, Brian M Peters, Bing Li, Lin Li, Guangchao Yu, Mark E Shirtliff
OBJECTIVES: A longitudinal surveillance aimed to investigate the antibiogram of three genus of important Gram-positive pathogens in Southern China during 2001-2015. METHODS: A total of 3849 Staphylococcus, Enterococcus and Streptococcus strains were isolated from Southern China during 2001-2015. Bacteria identification was performed by colony morphology, Gram staining, the API commercial kit and the Vitek 2 automated system. Antimicrobial susceptibility testing was determined by disk diffusion method and MIC method...
November 25, 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27894388/-analysis-of-distribution-and-drug-resistance-of-pathogens-isolated-from-541-hospitalized-children-with-burn-infection
#18
J X Dai, L Li, L Xu, Z H Chen, X Y Li, M Liu, Y Q Wen, X D Chen
Objective: To investigate the distribution and drug resistance of pathogens isolated from hospitalized children with burn infection. Methods: Totally 541 patients were hospitalized in Fujian Medical University Union Hospital, the 180th Hospital of Chinese People's Liberation Army(PLA), the 92th Hospital of PLA, and Longyan First Hospital from January 2013 to December 2015. Totally 848 clinical specimens (blood, catheter tip attachments, wound exudate, etc.) were collected for pathogen detection. After being identified by an automatic microbiological identification system, drug resistance of pathogens to 41 commonly-used antibiotics in clinic including gentamicin, aztreonam, erythromycin, clindamycin, etc...
November 20, 2016: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
https://www.readbyqxmd.com/read/27893682/peritoneal-dialysis-related-peritonitis-due-to-halomonas-hamiltonii-a-first-case-report
#19
Se Hwan Yeo, Jae Hoon Kwak, Yeo Un Kim, Jin Suk Lee, Hyo Jin Kim, Kyoung Hwa Park, Jung Sook Lee, Gyoung Yim Ha, Jeong Ho Lee, Jun Yeop Lee, Kyung Don Yoo
INTRODUCTION: Halomonas hamiltonii is a Gram-negative, halophilic, motile, and nonspore-forming rod bacterium. Although most Halomonas sp. are commonly found in saline environments, it has rarely been implicated as a cause of human infection. Herein, the authors present a case report of continuous ambulatory peritoneal dialysis (CAPD)-related peritonitis attributed to H hamiltonii. CASE PRESENTATION: An 82-year-old male patient who had been receiving CAPD therapy presented to an emergency department with complaints of abdominal pain and cloudy dialysate that had persisted for 2 days...
November 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27891500/interspecies-communication-between-pathogens-and-immune-cells-via-bacterial-membrane-vesicles
#20
Katerina S Jurkoshek, Ying Wang, Jaffre J Athman, Marian R Barton, Pamela A Wearsch
The production of extracellular vesicles is a universal mechanism for intercellular communication that is conserved across kingdoms. Prokaryotes secrete 50-250 nm membrane vesicles (MVs) in a manner that is regulated by environmental stress and is thought to promote survival. Since many types of host-derived stress are encountered during infection, this implies an important role for MV secretion in bacterial pathogenesis. Accordingly, MVs produced by gram-positive and gram-negative pathogens contain toxins, virulence factors, and other molecules that promote survival in the host...
2016: Frontiers in Cell and Developmental Biology
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