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https://www.readbyqxmd.com/read/28731663/-pulmonary-actinomycosis-and-tuberculosis-a-comorbidity-pediatric-case
#1
Elsa D Bisero, Graciela F Luque, Cristina N Rizzo, Alejandra E Zapata, María S Cuello
Actinomycosis is a chronic suppurative infection, produced by anaerobic Gram-positive bacteria or microaerobic Actinomyces species. It is rare in children and adolescents and it is more common in immunocompromised. Mycobacterium tuberculosis collaborates on the development of the disease. Pulmonary involvement appears as a picture of chronic condensation that does not improve with conventional antibiotic treatment. Classic complications affecting the thoracic wallwith drainage in «sulfur granule» and fistulization are described less frequently nowadays...
August 1, 2017: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/28729282/draft-genome-sequence-of-actinomycessucciniciruminis-strain-am4-t-isolated-from-cow-rumen-fluid
#2
Susakul Palakawong Na Ayudthaya, Bastian Hornung, Adithi Ravikumar Varadarajan, Wendy Plugge, Caroline M Plugge
Actinomyces succiniciruminis strain Am4(T), isolated from cow rumen fluid, can metabolize a range of substrates including complex carbohydrates to organic acids. Here, we report a 3.33-Mbp draft genome of Actinomyces succiniciruminis.
July 20, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28721040/effect-of-ultraviolet-treatment-on-bacterial-attachment-and-osteogenic-activity-to-alkali-treated-titanium-with-nanonetwork-structures
#3
Honghao Zhang, Satoshi Komasa, Chiho Mashimo, Tohru Sekino, Joji Okazaki
PURPOSE: Alkali-treated titanium with nanonetwork structures (TNS) possesses good osteogenic activity; however, the resistance of this material to bacterial contamination remains inadequate. As such, TNS implants are prone to postoperative infection. In this work, we attempted to alter the biological properties of TNS by treatment with short-duration high-intensity ultraviolet (UV) irradiation. METHODS: TNS discs were treated with UV light (wavelength =254 nm, strength =100 mW/cm(2)) for 15 minutes using a UV-irradiation machine...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28714842/molecular-and-biochemical-characteristics-of-the-inulosucrase-hugo-from-streptomyces-viridochromogenes-dsm40736-t%C3%A3-494
#4
Hans-Jörg Frasch, Sander S van Leeuwen, Lubbert Dijkhuizen
Polyfructans are synthesized from sucrose by plants (mostly inulin) and by both Gram-negative and Gram-positive bacteria (mostly levan). In the phylum Actinobacteria only levan synthesis by Actinomyces species has been reported. We have identified a putative fructansucrase gene (hugO) in Streptomyces viridochromogenes DSM40736 (Tü494). HugO was heterologously expressed and biochemically characterized. HPSEC-MALLS and 2D-1H-13C nuclear magnetic resonance (NMR) spectroscopy analysis showed that the fructan polymer produced in vitro has an Molecular Weight of 2...
July 17, 2017: Microbiology
https://www.readbyqxmd.com/read/28690491/a-complicated-thread-abdominal-actinomycosis-in-a-young-woman-with-crohn-disease
#5
Ari Nahum, Gregory Filice, Ashish Malhotra
Crohn disease is a chronic inflammatory condition that primarily affects the gastrointestinal tract. Typical manifestations include fever, weight loss, fatigue, and abdominal pain, and abdominal abscesses and fistulae are frequent complications. Abdominal actinomycosis is a subacute or indolent disease associated with Actinomyces spp. Symptoms can be very similar to those of Crohn disease, and fistulae are also common. Since ulcerations in the intestinal tract are thought to be caused by Actinomyces escaping from the gut lumen and establishing intra-abdominal infection, it seems likely that abdominal actinomycosis may occur in patients with inflammatory bowel disease...
May 2017: Case Reports in Gastroenterology
https://www.readbyqxmd.com/read/28688759/-respiratory-infections-caused-by-slow-growing-bacteria-nocardia-actinomyces-rhodococcus
#6
E Eschapasse, C Hussenet, A Bergeron, D Lebeaux
INTRODUCTION: Pneumonia caused by slow-growing bacteria is rare but sometimes severe. STATE OF THE ART: These infections share many similarities such as several differential diagnoses, difficulties to identify the pathogen, the importance of involving the microbiologist in the diagnostic investigation and the need for prolonged antibiotic treatment. However, major differences distinguish them: Nocardia and Rhodococcus infect mainly immunocompromised patients while actinomycosis also concerns immunocompetent patients; the severity of nocardioses is related to their hematogenous spread while locoregional extension by contiguity makes the gravity of actinomycosis...
July 5, 2017: Revue des Maladies Respiratoires
https://www.readbyqxmd.com/read/28684963/pelvic-actinomycosis
#7
REVIEW
Alejandra García-García, Ninfa Ramírez-Durán, Horacio Sandoval-Trujillo, María Del Socorro Romero-Figueroa
INTRODUCTION: Actinomycosis is a chronic bacterial infection caused by Actinomyces, Gram-positive anaerobic bacteria. Its symptomatology imitates some malignant pelvic tumours, tuberculosis, or nocardiosis, causing abscesses and fistulas. Actinomycoses are opportunistic infections and require normal mucous barriers to be altered. No epidemiological studies have been conducted to determine prevalence or incidence of such infections. OBJECTIVE: To analyse the clinical cases of pelvic actinomycosis reported worldwide, to update the information about the disease...
2017: Canadian Journal of Infectious Diseases & Medical Microbiology
https://www.readbyqxmd.com/read/28678838/the-oral-bacterial-microbiome-of-occlusal-surfaces-in-children-and-its-association-with-diet-and-caries
#8
Apoena Aguiar Ribeiro, Maria Andrea Azcarate-Peril, Maria Belen Cadenas, Natasha Butz, Bruce J Paster, Tsute Chen, Eric Bair, Roland R Arnold
Dental caries is the most prevalent disease in humans globally. Efforts to control it have been invigorated by an increasing knowledge of the oral microbiome composition. This study aimed to evaluate the bacterial diversity in occlusal biofilms and its relationship with clinical surface diagnosis and dietary habits. Anamneses were recorded from thirteen 12-year-old children. Biofilm samples collected from occlusal surfaces of 46 permanent second molars were analyzed by 16S rRNA amplicon sequencing combined with the BLASTN-based search algorithm for species identification...
2017: PloS One
https://www.readbyqxmd.com/read/28673590/parkinson-s-disease-the-hibernating-spore-hypothesis
#9
Ketil Berstad, Johanna E R Berstad
The authors support the hypothesis that a causative agent in Parkinson's disease (PD) might be either fungus or bacteria with fungus-like properties - Actinobacteria, and that their spores may serve as 'infectious agents'. Updated research and the epidemiology of PD suggest that the disease might be induced by environmental factor(s), possibly with genetic susceptibility, and that α-synuclein probably should be regarded as part of the body's own defense mechanism. To explain the dual-hit theory with stage 1 involvement of the olfactory structures and the 'gut-brain'-axis, the environmental factor is probably airborne and quite 'robust' entering the body via the nose/mouth, then to be swallowed reaching the enteric nervous system with retained pathogenicity...
July 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28670596/actinomycosis-causing-recurrent-perianal-fistulae
#10
Mariana Ferreira Cardoso, Carla Carneiro, Luís Carvalho Lourenço, Catarina Graça Rodrigues, Sara Folgado Alberto, Ana Alagoa João, Ricardo Rocha, Vasco Geraldes, Ana Costa, Jorge Reis, Vítor Nunes
Actinomycosis is a rare but easily curable infection that should be considered in the differential diagnosis of perianal fistulizing disease. We present the case of a 26-year-old woman with complex perianal fistulae, including trans-sphincteric and suprasphincteric fistulous tracts and a rectovaginal fistula, requiring multiple abscess drainages, seton placement, and antibiotic courses, with little improvement. After extensive investigation, Actinomyces spp. was identified in anal cytology. The patient underwent a 6-week course of intravenous penicillin followed by oral amoxicillin, with remarkable improvement...
2017: ACG Case Reports Journal
https://www.readbyqxmd.com/read/28669068/evaluation-of-laser-fluorescence-in-monitoring-non-cavitated-caries-lesion-progression-on-smooth-surfaces-in-vitro
#11
J A Rodrigues, C S Sarti, C M Assunção, R A Arthur, A Lussi, M B Diniz
The aim of this study was to evaluate the performance of a pen-type laser fluorescence (LF) device (LFpen: DIAGNOdent pen) to detect and monitor the progression of caries-like lesions on smooth surfaces. Fifty-two bovine enamel blocks were submitted to three different demineralisation cycles for caries-like lesion induction using Streptococcus mutans, Lactobacillus casei and Actinomyces naeslundii. At baseline and after each cycle, the enamel blocks were analysed under Knoop surface micro-hardness (SMH) and an LFpen...
July 2, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28662376/proteases-actinidin-papain-and-trypsin-reduce-oral-biofilm-on-the-tongue-in-elderly-subjects-and-in-vitro
#12
Naho Mugita, Takayuki Nambu, Kazuya Takahashi, Pao-Li Wang, Yutaka Komasa
OBJECTIVE: Dental plaque is a causative factor for oral disease and a potential reservoir for respiratory infection in the elderly. Therefore, there is a critical need for the development of effective methods to remove oral biofilm. The objective of this study was to investigate the effect of proteases on oral biofilm formation andremoval. DESIGN: The in vivo effect of actinidin, a cysteine protease, on the removal of tongue coating was assessed after orally taking a protease tablet...
June 13, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28647397/actinomyces-radicidentis-and-actinomyces-haliotis-coccoid-actinomyces-species-isolated-from-the-human-oral-cavity
#13
Rolf Claesson, Ulf Sjögren, Anders Esberg, Malin Brundin, Margareta Granlund
There are few reports on the bacterial species Actinomyces radicidentis in the literature. In this study, putative A. radicidentis isolates were collected from 16 root canal samples from 601 examined patients. The isolates were examined by biochemical tests, 16S rRNA gene sequencing, Arbitrarily-primed (AP-) PCR, antibiotic susceptibility testing, and MALDI-TOF analyses. In parallel, two A. radicidentis reference strains and two putative A. radicidentis isolates from United Kingdom were tested. Sixteen of the 18 isolates were confirmed as A...
June 21, 2017: Anaerobe
https://www.readbyqxmd.com/read/28643960/asymptomatic-subcutaneous-cervical-mass-due-to-actinomyces-odontolyticus-infection-in-a-pyriform-sinus-fistula
#14
Ryu Yanagisawa, Kisei Minami, Noriko Kubota, Tamaki Iwade, Yoshifumi Ogiso
No abstract text is available yet for this article.
June 23, 2017: Pediatrics International: Official Journal of the Japan Pediatric Society
https://www.readbyqxmd.com/read/28634238/electron-transport-chain-is-biochemically-linked-to-pilus-assembly-required-for-polymicrobial-interactions-and-biofilm-formation-in-the-gram-positive-actinobacterium-actinomyces-oris
#15
Belkys C Sanchez, Chungyu Chang, Chenggang Wu, Bryan Tran, Hung Ton-That
The Gram-positive actinobacteria Actinomyces spp. are key colonizers in the development of oral biofilms due to the inherent ability of Actinomyces to adhere to receptor polysaccharides on the surface of oral streptococci and host cells. This receptor-dependent bacterial interaction, or coaggregation, requires a unique sortase-catalyzed pilus consisting of the pilus shaft FimA and the coaggregation factor CafA forming the pilus tip. While the essential role of the sortase machine SrtC2 in pilus assembly, biofilm formation, and coaggregation has been established, little is known about trans-acting factors contributing to these processes...
June 20, 2017: MBio
https://www.readbyqxmd.com/read/28629509/actinomyces-vulturis-sp-nov-isolated-from-gyps-himalayensis
#16
Xiangli Meng, Shan Lu, Yiting Wang, Xin-He Lai, Yumeng Wen, Dong Jin, Jing Yang, Xiangning Bai, Gui Zhang, Ji Pu, Riuting Lan, Jianguo Xu
Two strains of Gram-stain-positive, facultatively anaerobic, non-spore-forming short rods (VUL7T and VUL8) were isolated from rectal swabs of Old World vultures, namely Gyps himalayensis, in Tibet-Qinghai Plateau, China. Optimal growth occurred at 37 °C, pH 6-7, with 1 % (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences classified the two strains to the genus Actinomyces, with highest 16S rRNA gene sequence similarity (95 %) to type strains of Actinomyces haliotis, Actinomyces radicidentis and Actinomyces urogenitalis...
June 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28629506/actinomyces-liubingyangii-sp-nov-isolated-from-the-vulture-gypaetus-barbatus
#17
Xiangli Meng, Shan Lu, Xin-He Lai, Yiting Wang, Yumeng Wen, Dong Jin, Jing Yang, Jianguo Xu
Two strains (VUL4_1T and VUL4_2) of Gram-staining-positive, catalase-negative, non-spore-forming short rods were isolated from rectal swabs of Old World vultures (Gypaetus barbatus) in the Tibet-Qinghai Plateau, China. Analysis of morphological characteristics and biochemical tests indicated that the two strains closely resembled each other but were distinct from other species of the genus Actinomyces previously described. Based on the results of 16S rRNA gene sequence comparison and genome analysis, strains were determined to be members of the genus Actinomyces, closely related to the type strains of Actinomyces marimammalium (96...
June 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28625067/colonic-obstruction-secondary-to-actinomyces
#18
Manuel Alfonso Jiménez Moreno, Isabel Sánchez Pedrique, Estíbaliz Obregón Martínez
Actinomycosis is an uncommon granulomatous infection by Gram-positive anaerobic bacteria of the genus Actinomyces. A. israelii is a major human pathogen. The most frequent locations for colonization are cervicofacial (50%), abdominal (20%) and thoracic (15-20%). The abdominal actinomycosis predisposing factors include recent surgery, trauma and neoplasias. Certain cases have been associated with the intrauterine contraception device (IUD).
June 19, 2017: Revista Española de Enfermedades Digestivas
https://www.readbyqxmd.com/read/28622118/imaging-spectrum-of-invasive-fungal-and-fungal-like-infections
#19
Hilary L P Orlowski, Sebastian McWilliams, Vincent M Mellnick, Sanjeev Bhalla, Meghan G Lubner, Perry J Pickhardt, Christine O Menias
Invasive fungal and fungal-like infections contribute to substantial morbidity and mortality in immunocompromised individuals. The incidence of these infections is increasing-largely because of rising numbers of immunocompromised patients, including those with neutropenia, human immunodeficiency virus, chronic immunosuppression, indwelling prostheses, burns, and diabetes mellitus, and those taking broad-spectrum antibiotics. Invasive fungal pathogens include primary mycotic organisms such as Histoplasma capsulatum, Coccidioides immitis, Blastomyces dermatitidis, and Paracoccidioides brasiliensis, which are true pathogens and inherently virulent...
July 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28613914/effect-of-rhizobacteria-on-arsenic-uptake-by-macrophyte-eichhornia-crassipes-mart-solms
#20
Parvinder Kaur, Simranjeet Singh, Vivek Kumar, Nasib Singh, Joginder Singh
Wastewater from municipal systems and industrial processes carries several trace metals including metalloid arsenic (As) which are considered serious environmental contaminants due to toxicity, and recalcitrant nature. In this study, we determined the phytoremediation of As by Eichhornia crassipes (Mart.) Solms either alone or in association with plant growth promoting rhizobacteria. Pseudomonas and Azotobacter inoculation to E. crassipes resulted in enhanced As removal compared to uninoculated control. Co-inoculation with a consortium of Pseudomonas, Azotobacter, Azospirillum, Actinomyces and Bacillus resulted in higher As (p<0...
June 14, 2017: International Journal of Phytoremediation
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