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Anaerobe

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https://www.readbyqxmd.com/read/28526497/mixed-species-biofilms-of-fusobacterium-necrophorum-and-porphyromonas-levii-impair-the-oxidative-response-of-bovine-neutrophils-in-vitro
#1
Joey S Lockhart, Andre G Buret, Howard Ceri, Douglas G Storey, Stefanie J Anderson, Douglas W Morck
Biofilms composed of anaerobic bacteria can result in persistent infections and chronic inflammation. Host immune cells have difficulties clearing biofilm-related infections and this can result in tissue damage. Neutrophils are a vital component of the innate immune system and help clear biofilms. The comparative neutrophilic response to biofilms versus planktonic bacteria remains incompletely understood, particularly in the context of mixed infections. The objective of this study was to generate mixed species anaerobic bacterial biofilms composed of two opportunistic pathogens, Fusobacterium necrophorum and Porphyromonas levii, and evaluate neutrophil responses to extracellular fractions from both biofilms and planktonic cell co-cultures of the same bacteria...
May 16, 2017: Anaerobe
https://www.readbyqxmd.com/read/28526496/molecular-characterization-and-antimicrobial-resistance-profile-of-clostridium-perfringens-type-a-isolates-from-humans-animals-fish-and-their-environment
#2
Jay Prakash Yadav, Suresh Chandra Das, Pankaj Dhaka, Deepthi Vijay, Manesh Kumar, Asish Kumar Mukhopadhyay, Goutam Chowdhury, Pranav Chauhan, Rahul Singh, Kuldeep Dhama, Satya Veer Singh Malik, Ashok Kumar
The study was aimed to characterize, and determine antibiogram of C. perfringens type A isolated from the feces of human and animal diarrhoeal cases, as well as healthy animals, meat of pigs and goats, gills and intestine of fish and samples from fish pond. A total of 460 samples, including human diarrhoeal cases (n = 130); diarrhoeal cases of pig (n = 52) and goat (n = 50); fecal samples from healthy pig (n = 50) and goat (n = 50); meat samples viz. pork meat (n = 52); goat meat (n = 50) and fish including their environmental sources (n = 26) were used for isolation and identification of C...
May 16, 2017: Anaerobe
https://www.readbyqxmd.com/read/28522363/a-bloodstream-infection-by-ruminococcus-gnavus-in-a-patient-with-a-gall-bladder-perforation
#3
Young Jin Kim, Hee Yoon Kang, Yujin Han, Mi Suk Lee, Hee Joo Lee
Ruminococcus gnavus is frequently found among human gut microbiome. However, human bloodstream infections by R. gnavus have been reported only three times. Clinical details were lacking for one case; the other two cases with concurrent bacteremia in patients with diverticulitis. We report a case of R. gnavus bloodstream infection in a patient with a gall bladder perforation suggesting its association with damage to the gastrointestinal tract. R. gnavus was misidentified using biochemical test but 16S rRNA sequencing and Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry were useful for correct identification...
May 15, 2017: Anaerobe
https://www.readbyqxmd.com/read/28522362/susceptibility-of-bacterial-vaginosis-bv-associated-bacteria-to-secnidazole-compared-to-metronidazole-tinidazole-and-clindamycin
#4
Melinda A B Petrina, Lisa A Cosentino, Lorna K Rabe, Sharon L Hillier
Secnidazole, a 5-nitroimidazole with a longer half-life, is structurally related to metronidazole and tinidazole. For treatment of bacterial vaginosis (BV), secnidazole is a suitable single-dose oral drug having a longer serum half-life than metronidazole. The objective of this study was to evaluate the antimicrobial susceptibility of vaginal isolates of facultative and anaerobic bacteria to secnidazole, metronidazole, tinidazole and clindamycin. A total of 605 unique BV-related bacteria and 108 isolates of lactobacilli recovered from the human vagina of US women during the years 2009-2015 were tested for antimicrobial susceptibility by the agar dilution CLSI reference method to determine the minimal inhibitory concentration (MIC)...
May 15, 2017: Anaerobe
https://www.readbyqxmd.com/read/28522361/clostridium-perfringens-a-bacterial-pathogen-gaining-recognition-in-necrotizing-pancreatitis
#5
Rakhi Biswas, Deepika K, Sujatha Sistla, Sarath Chandra Sistla, Anandhi Amaranathan
We report an interesting case of necrotizing pancreatitis due to Clostridium perfringens in an elderly man who came to the hospital with complaints of severe abdominal pain. The infection further worsened with the dissemination to other internal organs. The patient did not show any improvement despite intensive care and treatment. This emphasizies the fact that early diagnosis and appropriate treatment would reduce the morbidity associated with necrotizing pancreatitis.
May 15, 2017: Anaerobe
https://www.readbyqxmd.com/read/28501554/molecular-typing-of-clostridium-difficile-isolates-cultured-from-patient-stool-samples-and-gastroenterological-medical-devices-in-a-single-iranian-hospital
#6
Masoumeh Azimirad, Marcela Krutova, Otakar Nyc, Zahra Hasani, Leili Afrisham, Masoud Alebouyeh, Mohammad Reza Zali
This study aimed to characterize Clostridium difficile isolates cultured from stool samples of patients with C. difficile infection (CDI) and swabs from a medical environment in a gastroenterology centre in Tehran, Iran. A total of 158 samples (105 stool samples from hospitalized patients and 53 swabs from medical devices and the environment) were collected from January 2011 to August 2011 and investigated for the presence of C. difficile by direct anaerobic culture on a selective media for C. difficile. C...
May 10, 2017: Anaerobe
https://www.readbyqxmd.com/read/28483497/bio-methane-from-an-aerobic-digestion-using-activated-carbon-adsorption
#7
Muhammad Farooq, Alexandra H Bell, M N Almustapha, John M Andresen
There is an increasing global demand for carbon-neutral bio-methane from an-aerobic digestion (AD) to be injected into national gas grids. Bio-gas, a methane -rich energy gas, is produced by microbial decomposition of organic matter through an-aerobic conditions where the presence of carbon dioxide and hydrogen sulphide affects its performance. Although the microbiological process in the AD can be tailored to enhance the bio-gas composition, physical treatment is needed to convert the bio-gas into bio-methane...
May 5, 2017: Anaerobe
https://www.readbyqxmd.com/read/28478276/introduction-to-the-special-issue-highlighting-anaerobe-2016
#8
EDITORIAL
Laura M Cox, Casey M Theriot, Raina N Fichorova
No abstract text is available yet for this article.
May 4, 2017: Anaerobe
https://www.readbyqxmd.com/read/28478277/tolerance-mechanisms-of-human-residential-bifidobacteria-against-lysozyme
#9
Takuma Sakurai, Nanami Hashikura, Junichi Minami, Akio Yamada, Toshitaka Odamaki, Jin-Zhong Xiao
We previously reported that lysozyme present in breast milk is a selection factor for bifidobacterial colonization in infant human intestines. This study is aimed at examining their underlying mechanisms. Human-residential bifidobacteria (HRB) generally exhibited higher tolerance than non-HRB to lysozymes, except B. bifidum subspecies. To assess the involvement of enzymatic activity of lysozyme, peptidoglycan (PG) was isolated and the degree of O-acetylation (O-Ac) in 19 strains, including both HRB and non-HRB, was determined...
May 3, 2017: Anaerobe
https://www.readbyqxmd.com/read/28465256/a-combination-of-the-probiotic-and-prebiotic-product-can-prevent-the-germination-of-clostridium-difficile-spores-and-infection
#10
M Rätsep, S Kõljalg, E Sepp, I Smidt, K Truusalu, E Songisepp, J Stsepetova, P Naaber, R H Mikelsaar, M Mikelsaar
Clostridium difficile infection (CDI) is one of the most prevalent healthcare associated infections in hospitals and nursing homes. Different approaches are used for prevention of CDI. Absence of intestinal lactobacilli and bifidobacteria has been associated with C. difficile colonization in hospitalized patients. Our aim was to test a) the susceptibility of C. difficile strains of different origin and the intestinal probiotic Lactobacillus plantarum Inducia (DSM 21379) to various antimicrobial preparations incl...
April 29, 2017: Anaerobe
https://www.readbyqxmd.com/read/28465255/characteristics-of-on-demand-biogas-production-by-using-sugar-beet-silage
#11
Sharif Ahmed, Marian Kazda
On-demand electricity generation can be achieved by just-in-time biogas production instantly utilized in co-generation units. For this goal, easily degradable substrates like sugar beet silage have a high potential. Potential for on-demand biogas production from co-digestion of sugar beet silage (SS) with grass silage (GS) was evaluated in two experiments at organic loading rates (OLRs) of 1.5 kgVS m(-3) day(-1) and 2.5 kgVS m(-3) day(-1), respectively. Each experiment was fed with intermittent feeding system at 8hrs interval at the same feedstock ratios (volatile solids based) of GS:SS-1:0, 3:1 and 1:3, respectively...
April 29, 2017: Anaerobe
https://www.readbyqxmd.com/read/28458033/evaluation-of-the-genus-of-caldicellulosiruptor-for-production-of-1-2-propanediol-from-methylpentoses
#12
Eva Maria Ingvadottir, Sean Michael Scully, Johann Orlygsson
Caldicellulosiruptor species degrade l-rhamnose and l-fucose to 1,2-propanediol. Six of the nine species within the genus produced 1,2-propanediol from l-rhamnose and three utilized l-fucose to produce the compound. Yields of 1,2-propanediol up to 40.5% of the theoretical yield were observed from methylpentoses catabolism.
April 27, 2017: Anaerobe
https://www.readbyqxmd.com/read/28456518/vaginal-ecosystem-modeling-of-growth-patterns-of-anaerobic-bacteria-in-microaerophilic-conditions
#13
Audrie A Medina-Colorado, Kathleen L Vincent, Aaron L Miller, Carrie A Maxwell, Lauren N Dawson, Trevelyn Olive, Elena V Kozlova, Marc M Baum, Richard B Pyles
The human vagina constitutes a complex ecosystem created through relationships established between host mucosa and bacterial communities. In this ecosystem, classically defined bacterial aerobes and anaerobes thrive as communities in the microaerophilic environment. Levels of CO2 and O2 present in the vaginal lumen are impacted by both the ecosystem's physiology and the behavior and health of the human host. Study of such complex relationships requires controlled and reproducible causational approaches that are not possible in the human host that, until recently, was the only place these bacterial communities thrived...
April 26, 2017: Anaerobe
https://www.readbyqxmd.com/read/28454760/tropism-and-virulence-of-cutibacterium-formerly-propionibacterium-acnes-involved-in-implant-associated-infection
#14
Guillaume Ghislain Aubin, Jean-Philippe Lavigne, Yohan Foucher, Sarah Dellière, Didier Lepelletier, François Gouin, Stéphane Corvec
The recognition of the pathogenicity of Cutibacterium acnes in implant-associated infection is not always obvious. In this paper, we aimed to distinguish pathogenic and non-pathogenic C. acnes isolates. To reach this goal, we investigated the clonal complex (CC) of a large collection of C. acnes clinical isolates through Multi-Locus Sequence Typing (MLST), we established a Caenorhabditis elegans model to assess C. acnes virulence and we investigated the presence of virulence factors in our collection. Ours results showed that CC36 and CC53 C...
April 25, 2017: Anaerobe
https://www.readbyqxmd.com/read/28450145/are-anaerobes-a-major-underappreciated-cause-of-necrotizing-infections
#15
Hannah Zhao-Fleming, Sharmila Dissanaike, Kendra Rumbaugh
Necrotizing soft tissue infections (NSTIs) are the most severe and rapidly progressing class of skin and soft tissue infections (SSTIs). They are a surgical emergency and are associated with high mortality and morbidity. While NSTIs remain relatively rare, their incidence is steadily rising. Earlier diagnosis and more focused antibiotic treatments can potentially improve patient outcome, but both of these solutions require a more accurate understanding of the microbial component of these infections. While molecular detection methods, namely 16S sequencing, have not been traditionally used to identify the causative microorganisms in NSTIs, they are becoming more commonplace for other types of SSTIs, especially for chronic wound infections...
April 24, 2017: Anaerobe
https://www.readbyqxmd.com/read/28445776/antimicrobial-resistance-in-the-bacteroides-fragilis-group-in-faecal-samples-from-patients-receiving-broad-spectrum-antibiotics
#16
Kia Cirkeline Møller Hansen, Simon A F Schwensen, Daniel Pilsgaard Henriksen, Ulrik Stenz Justesen, Thomas Vognbjerg Sydenham
Members of the Bacteroides fragilis group are opportunistic pathogens and cause severe infections including bacteraemia. As increased levels of antimicrobial resistance in B. fragilis group bacteria can be detected years after administration of specific antibiotics, monitoring antimicrobial susceptibility in the gut microbiota could be important. The objectives of this study were to 1) investigate the distribution of species and the occurrence of reduced antimicrobial susceptibility in the B. fragilis group from patients treated at departments with a high level of antibiotic use, 2) to determine the prevalence of the carbapenem resistance gene cfiA in B...
April 23, 2017: Anaerobe
https://www.readbyqxmd.com/read/28442421/distinct-roles-for-dietary-lipids-and-porphyromonas-gingivalis-infection-on-atherosclerosis-progression-and-the-gut-microbiota
#17
Carolyn D Kramer, Alexandra M Simas, Xianbao He, Robin R Ingalls, Ellen O Weinberg, Caroline Attardo Genco
Mounting evidence in humans supports an etiological role for the microbiota in inflammatory atherosclerosis. Atherosclerosis is a progressive disease characterized by accumulation of inflammatory cells and lipids in vascular tissue. While retention of lipoprotein into the sub-endothelial vascular layer is believed to be the initiating stimulus leading to the development of atherosclerosis, activation of multiple pathways related to vascular inflammation and endothelial dysfunction sustain the process by stimulating recruitment of leukocytes and immune cells into the sub-endothelial layer...
April 23, 2017: Anaerobe
https://www.readbyqxmd.com/read/28442420/eggerthella-lenta-bacteremia-in-solid-tumor-cancer-patients-pathogen-or-witness-of-frailty
#18
Paul-Louis Woerther, Sami Antoun, Elisabeth Chachaty, Mansouria Merad
Eggerthella lenta is increasingly found in patients with severe comorbidities. Because oncologic patients are exposed to emerging pathogens, we aimed to describe the factors associated with E. lenta bacteremia in this immunosuppressed population. Oncology patients with blood cultures positive for E. lenta were retrospectively recorded from 2009 to 2015. Socio-demographic and medical/biological data as well as potential risk factors and mortality were recorded and analyzed. Twenty-three patients were included...
April 22, 2017: Anaerobe
https://www.readbyqxmd.com/read/28438498/performance-of-maldi-tof-ms-for-identification-of-oral-prevotella-species
#19
Mervi Gürsoy, Inka Harju, Jaakko Matomäki, Anne Bryk, Eija Könönen
During the past decade, the clinically relevant genus Prevotella has expanded considerably. Prevotella species can be isolated from nearly all types of oral infections but also from various non-oral infections. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) has been introduced in clinical microbiology laboratories as a convenient method for identifying bacterial isolates from clinical specimens. Here we tested the diagnostic accuracy of a total of 123 oral Prevotella isolates, selected based on their biochemical profile, by Bruker MALDI-TOF MS...
April 21, 2017: Anaerobe
https://www.readbyqxmd.com/read/28435010/ribotypes-associated-with-clostridium-difficile-outbreaks-in-brazil-display-distinct-surface-protein-profiles
#20
Thais Gonçalves Ferreira, Hercules Moura, John R Barr, Regina M C Pilotto Domingues, Eliane de Oliveira Ferreira
Clostridium difficile is a spore-forming anaerobic intestinal pathogen that causes Clostridium difficile infection (CDI). C. difficile is the leading cause of toxin-mediated nosocomial antibiotic-associated diarrhea. The pathogenesis of CDI is attributed to two major virulence factors, TcdA and TcdB toxins, that cause the symptomatic infection. C. difficile also expresses a number of key proteins, including cell wall proteins (CWPs). S-layer proteins (SLPs) are CWPs that form a paracrystalline surface array that coats the surface of the bacterium...
April 20, 2017: Anaerobe
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