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https://www.readbyqxmd.com/read/29050018/root-surface-biofilms-and-caries
#1
Thuy Do, Nailê Damé-Teixeira, Monika Naginyte, Philip D Marsh
Following gingival recession, which increases with age, the root surface becomes exposed, creating new environments for microbial colonization and biofilm formation. The formation of root surface biofilms is influenced by the availability and composition of saliva and gingival crevicular fluid; they provide components for the conditioning film (acquired root surface pellicle) and also act as a source of nutrients. The early bacterial colonizers of the root surface are similar to those found on the enamel, and Gram-positive species such as Streptococcus sanguinis, S...
2017: Monographs in Oral Science
https://www.readbyqxmd.com/read/29040018/primary-abdominal-wall-abscess-by-actinomyces-and-eikenella-corrodens-a-first-report
#2
Ismael Mora-Guzmán, Elena Martín-Pérez
No abstract text is available yet for this article.
October 17, 2017: Surgical Infections
https://www.readbyqxmd.com/read/29033815/cutaneous-nocardiosis-simulating-cutaneous-lymphatic-sporotrichosis
#3
Pedro Secchin, Beatriz Moritz Trope, Larissa Araujo Fernandes, Glória Barreiros, Marcia Ramos-E-Silva
Sporotrichosis is the subcutaneous mycosis caused by several species of the Sporothrix genus. With worldwide occurrence, the State of Rio de Janeiro is presently undergoing a zoonotic sporotrichosis epidemic. The form of lymphocutaneous nocardiosis is rare, being caused especially by Nocardia brasiliensis. It appears as a nodular or ulcerated lesion, with multiple painful erythematous nodules or satellite pustules distributed along the lymphatic tract, similar to the lymphocutaneous variant of sporotrichosis...
May 2017: Case Reports in Dermatology
https://www.readbyqxmd.com/read/29024061/in-vitro-studies-of-the-antimicrobial-effect-of-non-thermal-plasma-activated-water-as-a-novel-mouthwash
#4
Yinglong Li, Jie Pan, Guopin Ye, Qian Zhang, Jing Wang, Jue Zhang, Jing Fang
The aim of this study was to evaluate the antimicrobial effects of non-thermal plasma-activated water (PAW) as a novel mouthwash in vitro. Three representative oral pathogens - Streptococcus mutans, Actinomyces viscosus and Porphyromonas gingivalis - were treated with PAW. The inactivation effect was evaluated using the colony-forming unit (CFU) method, and the morphological and structural changes of a cell were observed by scanning electron microscopy and transmission electron microscopy (TEM). The physicochemical properties of PAW were analysed, and its influence on the leakage of intracellular proteins and DNA was evaluated...
October 11, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/29020920/first-identification-of-gordonia-sputi-in-a-post-traumatic-endophthalmitis-patient-a-case-report-and-literatures-review
#5
Wei Fang, Jiuke Li, Hu-Shan Cui, Xiaohong Jin, Jing Zhai, Yuanmin Dai, Yumin Li
BACKGROUND: We present a case of post-traumatic endophthalmitis with relatively good prognosis caused by Gordonia sputi, which, to our knowledge is the first case in the literature. CASE PRESENTATION: A 24 year old man, who underwent an intraocular foreign body extraction half a month before presentation in the left eye, was referred to us complaining of blurred vision and slight pain for 5 days. His first presentation showed moderate intracameral and intravitreous purulent inflammation with a best corrected vision of counting fingers...
October 11, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28993578/characterizations-of-oral-microbiota-in-elderly-nursing-home-residents-with-diabetes
#6
Taiji Ogawa, Mariko Honda-Ogawa, Kazunori Ikebe, Yumiko Notomi, Yoshiko Iwamoto, Itsuki Shirobayashi, Seiko Hata, Masahito Kibi, Shizuko Masayasu, Satoshi Sasaki, Shigetada Kawabata, Yoshinobu Maeda
Over 700 bacterial species have been detected in the oral cavity. Several studies have suggested that periodontitis is associated with systemic disorders such as diabetes mellitus, indicating a key role for oral microbiota in human health. However, the relationship between oral microbiota and diabetes has not been well clarified. Therefore, we conducted microbiome analysis of saliva samples obtained from 15 elderly residents (3 with type 2 diabetes mellitus [DM] and 12 without diabetes [non-DM]) at three different nursing homes, as well as 9 young healthy controls (HC)...
October 6, 2017: Journal of Oral Science
https://www.readbyqxmd.com/read/28946854/cervical-precancerous-changes-and-selected-cervical-microbial-infections-kiambu-county-kenya-2014-a-cross-sectional-study
#7
Evalyne Wambui Kanyina, Lucy Kamau, Margaret Muturi
BACKGROUND: Cervical cancer is the predominant cancer among women in Kenya and second most common in women in developing regions. Population-based cytological screening and early treatment reduces morbidity and mortality associated with the cancer. We determined the occurrence of cervical precancerous changes and cervical microbial infections (Trichomonas vaginalis, Candida albicans, Neisseria gonorrhea and Actinomyces) among women attending Family Health Option Kenya (FHOK) clinic in Thika...
September 25, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28946780/extracellular-dna-and-lipoteichoic-acids-interact-with-exopolysaccharides-in-the-extracellular-matrix-of-streptococcus-mutans-biofilms
#8
Midian C Castillo Pedraza, Tatiana F Novais, Roberta C Faustoferri, Robert G Quivey, Anton Terekhov, Bruce R Hamaker, Marlise I Klein
Streptococcus mutans-derived exopolysaccharides are virulence determinants in the matrix of biofilms that cause caries. Extracellular DNA (eDNA) and lipoteichoic acid (LTA) are found in cariogenic biofilms, but their functions are unclear. Therefore, strains of S. mutans carrying single deletions that would modulate matrix components were used: eDNA - ∆lytS and ∆lytT; LTA - ∆dltA and ∆dltD; and insoluble exopolysaccharide - ΔgtfB. Single-species (parental strain S. mutans UA159 or individual mutant strains) and mixed-species (UA159 or mutant strain, Actinomyces naeslundii and Streptococcus gordonii) biofilms were evaluated...
September 25, 2017: Biofouling
https://www.readbyqxmd.com/read/28934367/exploring-the-salivary-microbiome-of-children-stratified-by-the-oral-hygiene-index
#9
Izumi Mashima, Citra F Theodorea, Boonyanit Thaweboon, Sroisiri Thaweboon, Frank A Scannapieco, Futoshi Nakazawa
Poor oral hygiene often leads to chronic diseases such as periodontitis and dental caries resulting in substantial economic costs and diminished quality of life in not only adults but also in children. In this study, the salivary microbiome was characterized in a group of children stratified by the Simplified Oral Hygiene Index (OHI-S). Illumina MiSeq high-throughput sequencing based on the 16S rRNA was utilized to analyze 90 salivary samples (24 Good, 31 Moderate and 35 Poor oral hygiene) from a cohort of Thai children...
2017: PloS One
https://www.readbyqxmd.com/read/28916389/removal-and-killing-of-multispecies-endodontic-biofilms-by-n-acetylcysteine
#10
Young-Suk Choi, Cheul Kim, Ji-Hoi Moon, Jin-Yong Lee
Removal of bacterial biofilm from the root canal system is essential for the management of endodontic disease. Here we evaluated the antibacterial effect of N-acetylcysteine (NAC), a potent antioxidant and mucolytic agent, against mature multispecies endodontic biofilms consisting of Actinomyces naeslundii, Lactobacillus salivarius, Streptococcus mutans and Enterococcus faecalis on sterile human dentin blocks. The biofilms were exposed to NAC (25, 50 and 100mg/mL), saturated calcium hydroxide or 2% chlorhexidine solution for 7 days, then examined by scanning electron microscopy...
September 2, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28916324/in%C3%A2-vitro-investigation-of-the-antimicrobial-effect-of-three-bisphosphonates-against-different-bacterial-strains
#11
Michael A Ermer, Simon C Kottmann, Jörg-Elard Otten, Annette Wittmer, Philipp Poxleitner, Klaus Pelz
PURPOSE: Since the first descriptions of medication-related osteonecrosis of the jaw (MRONJ) in 2003, the pathogenesis has remained unanswered. Recent histomorphometric studies have found several microorganisms, including Actinomyces, Bacillus, Fusobacterium, Staphylococcus, Streptococcus, Selenomonas, Treponema, and Candida albicans in necrotic bone. Polymerase chain reaction studies have recently confirmed the occurrence of 48 genera. Only a few studies have examined the antimicrobial effect of bisphosphonates (BPs)...
August 31, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28898513/characterisation-of-a-sucrose-independent-in-vitro-biofilm-model-of-supragingival-plaque
#12
Kota Tsutsumi, Masato Maruyama, Akira Uchiyama, Ken-Ichiro Shibasaki
OBJECTIVES: Sugar consumption has been decreasing in Japan, suggesting higher rates of sucrose-independent supragingival plaque formation. For developing an in vitro biofilm model of sucrose-independent supragingival plaque, this study aimed to investigate the compositions and functions on contributing to cariogenicity in comparison with sucrose-dependent biofilm. MATERIALS AND METHODS: An in vitro multispecies biofilm containing Actinomyces naeslundii, Streptococcus gordonii, S...
September 12, 2017: Oral Diseases
https://www.readbyqxmd.com/read/28894842/retroperitoneal-actinomycosis-a-rare-sequela-of-an-infected-obstructing-ureteral-stone
#13
Elizabeth Bearrick, Colby A Dixon, Joshua Rhein, Michael S Borofsky
Background: Actinomycosis is a condition in which Actinomyces, a normal component of the oral and gastrointenstial flora, becomes pathogenic in the setting of damaged tissue, leading to widespread tissue destruction across fascial planes. Prior literature describing this condition is rare, particularly cases involving the retroperitoneum. In this study, we report a case of retroperitoneal actinomycosis caused by an infected, obstructing ureteral stone. Case Presentation: A 48-year-old woman with a history of substance abuse, malnutrition, and gastric bypass presented to the emergency room with a 3-week history of abdominal pain and fevers...
2017: Journal of Endourology Case Reports
https://www.readbyqxmd.com/read/28892422/clinicopathologic-and-microbiologic-findings-associated-with-emphysematous-cystitis-in-27-dogs
#14
Lindsay Kate Merkel, Jody Lulich, David Polzin, Christopher Ober, Jodi Westropp, Jane Sykes
This is a retrospective case series of 27 dogs with emphysematous cystitis. Medical records from two veterinary teaching hospitals from 1992 to 2014 were reviewed. The aims of the study were to determine imaging findings, common underlying disease processes, and prevalent bacterial species and their antimicrobial susceptibility patterns in dogs with emphysematous cystitis. The most common lower urinary tract sign was hematuria. Gas was detected in the wall and lumen of the urinary bladder in 14 of 27 dogs (51...
September 11, 2017: Journal of the American Animal Hospital Association
https://www.readbyqxmd.com/read/28888064/the-cytopathology-of-actinomyces-nocardia-and-their-mimickers
#15
REVIEW
Kelsey E McHugh, Charles D Sturgis, Gary W Procop, Daniel D Rhoads
Nocardia species and Actinomyces species are 2 of the most commonly diagnosed filamentous bacteria in routine cytopathology practice. These genera share many overlapping cytomorphologic features, including their thin, beaded, branching, Gram-positive, GMS-positive filamentous structures that fragment at their peripheries into bacillary- and coccoid-appearing forms. Features that help distinguish between these 2 microorganisms include the width of their filamentous structures, the angles at which they branch, and their ability or lack thereof to retain a modified acid-fast stain...
September 9, 2017: Diagnostic Cytopathology
https://www.readbyqxmd.com/read/28879077/a-rare-case-of-actinomyces-meyeri-empyema-still-a-challenging-entity-to-manage
#16
Vera Clérigo, Lígia Fernandes, Amélia Feliciano, Lurdes Carvalho
Actinomyces meyeri is a rare pathogen and an infrequent cause of human actinomycosis. Less than ten cases were reported in the English-literature to date concerning A. meyeri empyema. We herein report a case to promote the awareness and adequate management of the disease. A 44-year-old immunocompetent male with known pulmonary disease was diagnosed with an A. meyeri empyema. He underwent chest tube drainage and a short-term treatment with clindamycin for 4 months. This is the first report of a patient with structural pulmonary disease with an A...
2017: Respiratory Medicine Case Reports
https://www.readbyqxmd.com/read/28875145/actinomyces-a-deceptive-infection-of-oral-cavity
#17
Rishi Thukral, Kirti Shrivastav, Vidhi Mathur, Animesh Barodiya, Saurabh Shrivastav
Actinomycosis is an infrequent chronic infection regarded as the most misdiagnosed disease by experienced clinicians. The Office of Rare Diseases at the National Institute of Health has also listed this disease as a "rare disease." This article presents a case report of actinomycosis of the alveolus with unusual clinical features but a successful resolution. It also states the importance of biopsy of deceptive inflammatory lesions that do not respond or recur after conventional treatment modalities.
August 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/28858630/quantitative-assessment-of-salivary-oral-bacteria-according-to-the-severity-of-dental-caries-in-childhood
#18
Natália H Colombo, Paula F Kreling, Laís F F Ribas, Jesse A Pereira, Christine A Kressirer, Marlise I Klein, Anne C R Tanner, Cristiane Duque
This study aimed to assess differences in selected oral bacteria in children according to the severity of dental caries. One hundred and thirty-six children, 36-60 months old were divided into three groups according to caries status: caries-free (CF) (n=47), early childhood caries (ECC) (n=40) and severe-early childhood caries (S-ECC) (n=49). Saliva was collected for detection and quantification of selected oral streptococci, Actinomyces naeslundii, Lactobacillus spp., Bifidobacterium spp., and Scardovia wiggsiae by quantitative-polymerase chain reaction...
November 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28857023/actinomyces-gaoshouyii-sp-nov-isolated-from-plateau-pika-ochotona-curzoniae
#19
Xiangli Meng, Yiting Wang, Shan Lu, Xin-He Lai, Dong Jin, Jing Yang, Jianguo Xu
Two strains (pika_113T and pika_114) of a previously undescribed Actinomyces-like bacterium were recovered from the intestinal contents of plateau pika (Ochotona curzoniae) on the Tibet-Qinghai Plateau, China. Results from biochemical characterization indicated that the two strains were phenotypically homogeneous and distinct from other previously described species of the genus Actinomyces. Based on the comparison of 16S rRNA gene sequences and genome analysis, the bacteria were determined to be a hitherto unknown subline within the genus Actinomyces, being most closely related to type strains of Actinomyces denticolens and Actinomyces timonensis with a respective 97...
September 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28856090/a-case-of-relapsed-lung-abscess-caused-by-eubacterium-brachy-infection-following-an-initial-diagnosis-of-pulmonary-actinomycosis
#20
Hideaki Yamakawa, Eri Hagiwara, Masahiro Hayashi, Takuma Katano, Kosuke Isomoto, Ryota Otoshi, Ryota Shintani, Satoshi Ikeda, Kaori Tanaka, Takashi Ogura
We report a rare case of lung abscess due to Eubacterium brachy. In this case, an analysis of the aspirate from frank pus revealed Gram-positive coccobacilli. We initially strongly suspected lung abscess associated with actinomycosis because of the chronic/recurrent clinical course and radio-pathological findings such as a granuloma lesion. Although a biochemical analysis revealed Actinomyces sp., 16S rRNA gene sequencing and a phylogenetic tree analysis of the isolated strain confirmed the presence of E. brachy...
2017: Respiratory Medicine Case Reports
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