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https://www.readbyqxmd.com/read/28427348/comparative-genomics-and-evolution-of-the-amylase-binding-proteins-of-oral-streptococci
#1
Elaine M Haase, Yurong Kou, Amarpreet Sabharwal, Yu-Chieh Liao, Tianying Lan, Charlotte Lindqvist, Frank A Scannapieco
BACKGROUND: Successful commensal bacteria have evolved to maintain colonization in challenging environments. The oral viridans streptococci are pioneer colonizers of dental plaque biofilm. Some of these bacteria have adapted to life in the oral cavity by binding salivary α-amylase, which hydrolyzes dietary starch, thus providing a source of nutrition. Oral streptococcal species bind α-amylase by expressing a variety of amylase-binding proteins (ABPs). Here we determine the genotypic basis of amylase binding where proteins of diverse size and function share a common phenotype...
April 20, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28418794/microbial-diversity-in-milk-of-women-with-mastitis-potential-role-of-coagulase-negative-staphylococci-viridans-group-streptococci-and-corynebacteria
#2
Pilar Mediano, Leonides Fernández, Esther Jiménez, Rebeca Arroyo, Irene Espinosa-Martos, Juan M Rodríguez, María Marín
BACKGROUND: Lactational mastitis constitutes a significant cause of premature weaning. However, its etiology, linked to the presence of pathogenic microorganisms, has been scarcely reported. Research aim: The aim of this study was to describe the microbial diversity in milk samples from women suffering from lactational mastitis and to identify more accurately a collection of isolates belonging to coagulase-negative staphylococci, streptococci, and coryneform bacteria. METHODS: This is a cross-sectional descriptive one-group study...
May 2017: Journal of Human Lactation: Official Journal of International Lactation Consultant Association
https://www.readbyqxmd.com/read/28411005/bacterial-and-histopathological-findings-in-deep-head-and-neck-infections-a-retrospective-analysis
#3
Robert Cordesmeyer, Philipp Kauffmann, Tröltzsch Markus, Christian Sömmer, Helmut Eiffert, Felix Bremmer, Rainer Laskawi
OBJECTIVES: Deep neck infections are among the most dangerous acute diseases in the head and neck region. This analysis gives an overview of the bacterial and histopathologic findings of deep neck infections. STUDY DESIGN: From January 2002 to December 2012, 63 patients were diagnosed with and treated for deep neck infections at the University Medical Center Göttingen. Bacterial and histopathologic examinations were made, and the occurrence of bacterial pathogens and histopathologic findings were analyzed...
February 20, 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/28399945/a-prospective-holistic-multicenter-approach-to-tracking-and-understanding-bloodstream-infections-in-pediatric-hematology-oncology-patients
#4
Aditya H Gaur, David G Bundy, Eric J Werner, Jeffrey D Hord, Marlene R Miller, Li Tang, John P Lawlor, Amy L Billett
OBJECTIVE To assess the burden of bloodstream infections (BSIs) among pediatric hematology-oncology (PHO) inpatients, to propose a comprehensive, all-BSI tracking approach, and to discuss how such an approach helps better inform within-center and across-center differences in CLABSI rate DESIGN Prospective cohort study SETTING US multicenter, quality-improvement, BSI prevention network PARTICIPANTS PHO centers across the United States who agreed to follow a standardized central-line-maintenance care bundle and track all BSI events and central-line days every month...
April 12, 2017: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/28387901/endocarditis-sustained-by-streptococcus-viridans-with-normal-levels-of-procalcitonin-an-unexpected-finding
#5
G Merra, D Marsiliani, S Di Giambenedetto, F Franceschi
OBJECTIVE: Procalcytonin is a useful marker of bacterial infections. Several studies have reported elevated serum levels of PCT in patients with infective endocarditis (IE) and/or other infections sustained by cocci. We report a rare case of IE attributed to Streptococcus viridans in whom levels of PCT were normal. CASE REPORT: A 67 years-old male was admitted to the Emergency Department for a 25-day history of recurring night fever. Upon admission, patient underwent blood test, including PCT, showing normal levels, except for a slight increased creatinine concentration (1...
March 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28331804/infected-ascites-distinguishing-secondary-peritonitis-from-spontaneous-bacterial-peritonitis-in-a-cirrhotic-patient-with-classic-symptoms
#6
Marvin Louis Roy Lu, Akanksha Agarwal, Josh Sloan, Aaron Kosmin
INTRODUCTION: Spontaneous bacterial peritonitis can be differentiated from secondary bacterial peritonitis by the absence of a surgically treatable intra-abdominal source of infection. However, oftentimes this is unapparent and other clinical clues need to be sought after to make the right diagnosis. CASE: A 64-year-old woman was admitted because of three days of worsening diffuse abdominal pain and distention. She was morbidly obese and had a history of non-alcoholic steatohepatitis (NASH) cirrhosis...
2017: IDCases
https://www.readbyqxmd.com/read/28321788/characteristics-of-aerococcus-viridans-isolated-from-bovine-subclinical-mastitis-and-its-effect-on-milk-scc-yield-and-composition
#7
Meng Sun, Jian Gao, Tariq Ali, Dan Yu, Shiyao Zhang, Saeed U Khan, Séamus Fanning, Bo Han
Aerococcus viridians (A. viridans), an environmental Gram-positive bacterium, has been documented to be associated with bovine mastitis. However, its exact role in bovine mastitis and the changes it brings about in milk characteristics are not yet known. The objectives of the current study were to describe the antibiotic resistance of A. viridans from bovine mastitis as well as the correlation between existence of this pathogen in udders and the somatic cell counts (SCC), daily milk yield, and composition of individual cow...
March 20, 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/28284306/an-improved-amperometric-triglyceride-biosensor-based-on-co-immobilization-of-nanoparticles-of-lipase-glycerol-kinase-and-glycerol-3-phosphate-oxidase-onto-pencil-graphite-electrode
#8
Vinay Narwal, C S Pundir
Nanoparticles (NPs) of commercial lipase from Candida rugosa, of glycerol kinase (GK) from Cellulomonas species, of glycerol-3- phosphate oxidase (GPO) from Aerococcus viridans were prepared, characterized and co-immobilized onto a pencil graphite (PG) electrode. The morphological and electrochemical characterization of PG electrode was performed by scanning electron microscopy (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) before and after co-immobilization of enzyme nanoparticles (ENPs)...
May 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28283005/-comparison-of-maldi-tof-and-16s-rrna-methods-in-identification-of-viridans-group-streptococci
#9
Serap Süzük Yıldız, Banu Kaşkatepe, Salih Altınok, Mustafa Çetin, Alper Karagöz, Sümeyra Savaş
Accurate identification of viridans group streptococci (VGS) frequently encountered as a causative agent of infective endocarditis is always a challenge for the clinical microbiology laboratory. Clinical microbiology laboratories generally use semi automatic/full automatic systems, molecular methods and also conventional methods for the identification of these bacteria. There are recent published studies that have used MALDI-TOF (Matrix Assisted Laser Ionization Mass Spectrometry-Time of Flight) systems in the identification of VGS...
January 2017: Mikrobiyoloji Bülteni
https://www.readbyqxmd.com/read/28279319/infective-endocarditis-risk-after-percutaneous-pulmonary-valve-implantation-with-the-melody-and%C3%A2-sapien%C3%A2-valves
#10
Sebastien Hascoet, Lucia Mauri, Caroline Claude, Emmanuelle Fournier, Julie Lourtet, Jean-Yves Riou, Philippe Brenot, Jérôme Petit
OBJECTIVES: This study compared the risk of infective endocarditis (IE) after percutaneous pulmonary valve implantation (PPVI) with the Sapien and Melody valves. BACKGROUND: The incidence of IE after PPVI is estimated at 3% per year with the Melody valve. The Sapien valve is a more recently marketed valve used for PPVI. METHODS: We retrospectively included consecutive patients who underwent PPVI at a single center between 2008 and 2016. IE was diagnosed using the modified DUKE criteria...
March 13, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28273968/aerococcus-viridans-a-rare-pathogen-causing-urinary-tract-infection
#11
Balvinder Mohan, Kamran Zaman, Naveen Anand, Neelam Taneja
Aerococci are Gram-positive cocci with colony morphology similar to viridans streptococci. Most often these isolates in clinical samples are misidentified and considered insignificant. However, with the use newer techniques like Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass-Spectrometry (MALDI-TOF MS), aerococci have been recognized as significant human pathogens capable of causing a diverse spectrum of infections. Among the different species of aerococci, Aerococcus urinae is the most common agent causing Urinary Tract Infection (UTI) followed by A...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28264848/impact-of-high-level-daptomycin-resistance-in-streptococcus-mitis-group-on-virulence-and-survivability-during-daptomycin-treatment-in-experimental-infective-endocarditis
#12
C Garcia-de-la-Maria, Y Q Xiong, J M Pericas, Y Armero, A Moreno, N N Mishra, M J Rybak, T T Tran, C A Arias, P M Sullam, A S Bayer, J M Miro
Streptococcus mitis group is the most common cause of infective endocarditis among the viridans group streptococci. It has a propensity to be β-lactam-resistant, as well as to rapidly develop high-level and durable resistance to daptomycin. We compared a parental, daptomycin-susceptible (DAP-S) S. mitis/oralis strain and its daptomycin-resistant (DAP-R) variant in an experimental endocarditis model in terms of: i) their relative fitness in multiple target organs in this model (vegetations; kidneys; spleen) when animals were challenged either individually vs...
March 6, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28257904/in-vitro-activity-of-ceftaroline-and-comparator-agents-against-gram-positive-and-gram-negative-clinical-isolates-from-cancer-patients
#13
Kenneth V I Rolston, Mohamed A Jamal, Lior Nesher, Samuel A Shelburne, Issam Raad, Randall A Prince
Bacterial infections are common in cancer patients. Ceftaroline (CFT) is a broad-spectrum cephalosporin with activity against most Gram-positive organisms (GPOs) and many Gram-negative organisms. In this study, the in vitro activity of CFT was compared with vancomycin (VAN), daptomycin (DAP), linezolid (LZD), trimethoprim/sulphamethoxazole (SXT) and tigecycline (TIG) against bacteria (predominantly blood culture isolates) isolated from cancer patients in 2014 and 2015. CFT was active against methicillin-susceptible Staphylococcus aureus (MSSA), methicillin-resistant S...
April 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28223386/surveillance-of-omadacycline-activity-tested-against-clinical-isolates-from-a-global-north-america-europe-latin-america-and-asia-western-pacific-collection-2010-2011
#14
Michael A Pfaller, Michael D Huband, Paul R Rhomberg, Robert K Flamm
Omadacycline is a broad spectrum aminomethylcycline in late-stage clinical development for acute bacterial skin and skin structure infections and community-acquired pneumonia as both an oral and intravenous, once-daily formulation. In this report omadacycline and comparators were tested against 69,246 non-duplicate bacterial isolates collected prospectively during 2010 and 2011 from medical centers in Asia-Pacific (11,397 isolates), Europe (23,490 isolates), Latin America (8,038 isolates) and North America (26,321 isolates)...
February 21, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28202116/-pathogens-of-infections-in-the-induction-period-of-childhood-acute-lymphoblastic-leukemia-and-drug-resistance-of-isolated-strains
#15
Zai-Sheng Chen, Ling Zheng, Yi-Qiao Chen, Jing-Hui Yang, Jian Li
OBJECTIVE: To investigate the infections occurring in the induction period of childhood acute lymphoblastic leukemia (ALL), the pathogens of the infections, and drug resistance of isolated strains. METHODS: A retrospective analysis was performed for the clinical data of 130 children with newly-diagnosed childhood ALL. Infections occurring during the induction chemotherapy, pathogenic strains, and drug-resistance spectrum were analyzed. RESULTS: The incidence rate of clinical infection and/or microbial infection reached 76...
February 2017: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/28193649/pbp2x-in-streptococcus-pseudopneumoniae-an-insight-into-the-diversity-of-pbp2x-alleles-and-mutations-in-viridans-streptococci
#16
Mark van der Linden, Julia Otten, Carina Bergmann, Cristina Latorre, Josefina Liñares, Regine Hakenbeck
Speciation of commensal streptococci is an everlasting problem due to their ability for genetic transformation. A new challenge in this respect is the recently described S. pseudopneumoniae as a new species, distinguished from closely related pathogenic S. pneumoniae and commensal S. mitis by a variety of physiological and molecular biological tests. Fortyone atypical S. pneumoniae have been collected at the National Reference Center for Streptococci (NRSG) in Germany. MLST analysis confirmed the species S...
February 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28167542/in-vitro-activity-of-delafloxacin-against-contemporary-bacterial-pathogens-from-the-united-states-and-europe-2014
#17
M A Pfaller, H S Sader, P R Rhomberg, R K Flamm
The in vitro activities of delafloxacin and comparator antimicrobial agents against 6,485 bacterial isolates collected from medical centers in Europe and the United States in 2014 were tested. Delafloxacin was the most potent agent tested against methicillin-susceptible Staphylococcus aureus (MSSA), methicillin-resistant S. aureus, Streptococcus pneumoniae, viridans group streptococci, and beta-hemolytic streptococci and had activity similar to that of ciprofloxacin and levofloxacin against certain members of the Enterobacteriaceae Overall, the broadest coverage of the tested pathogens (Gram-positive cocci and Gram-negative bacilli) was observed with meropenem and tigecycline in both Europe and the United States...
April 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28149706/evaluation-of-epidemiological-clinical-and-microbiological-features-of-definite-infective-endocarditis
#18
Reza Faraji, Mostafa Behjati-Ardakani, Seyed Mohammad Moshtaghioun, Seyed Mehdi Kalantar, Seyedeh Mahdieh Namayandeh, Mohammadhossien Soltani, Hengameh Zandi, Ali Dehghani Firoozabadi, Neda Tavakkoli Banizi, Foroozandeh Qasemi Kahtooie, Mehdi Banaei, Mohammadtaghi Sarebanhassanabadi
Background: Infective endocarditis (IE) is a microbial infection of heart valves and its endothelial lining which is considered as a life-threatening disorder. This study evaluated the epidemiological, clinical, and microbiological features of IE at the Cardiovascular Research Center in Yazd, Iran. Methods: The cross-sectional study was conducted on 20 patients diagnosed with definite IE on the basis of Duke's criteria hospitalized for one year in the Cardiovascular Research Center in Yazd, Iran, from January 2015 to December 2015...
2017: GMS Hygiene and Infection Control
https://www.readbyqxmd.com/read/28144393/percutaneous-drainage-as-a-first-therapeutic-step-prior-to-surgery-in-liver-hydatid-cyst-abscess-is-it-worth-it
#19
Aylhin J Lopez-Marcano, Jose M Ramia, Vladimir Arteaga, Roberto De la Plaza, Jhonny D Gonzales, Anibal Medina
AIM: To delay surgery until the patient is in a better condition, and thus to decrease postoperative morbidity. METHODS: Using this algorithm we treated three patients aged 55, 75 and 80 years. In all three patients the clinical presentation was fever without a clear source of infection; all had nonspecific symptoms such as general malaise, dyspnea, and abdominal discomfort in the previous 15 d. They came to the emergency room at our hospital due to deterioration of their general condition...
January 18, 2017: World Journal of Hepatology
https://www.readbyqxmd.com/read/28129822/-antimicrobial-spectrum-of-dalbavancin-mechanism-of-action-and-in-vitro-activity-against-gram-positive-microorganisms
#20
Emilia Cercenado
Because of the increase in bacterial resistance, there is a need for new antimicrobial agents. Dalbavancin is a semisynthetic glycopeptide that inhibits the late stages of bacterial cell wall synthesis in the same way as vancomycin, but in addition, its lipophilic side chain anchors dalbavancin to the cellular membrane and allows enhanced activity compared with that of vancomycin. Dalbavancin possesses a broad spectrum of in vitro activity against Gram-positive aerobic and anaerobic microorganisms, being 4-8 times more potent than vancomycin...
January 2017: Enfermedades Infecciosas y Microbiología Clínica
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