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Molecular microbiology

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https://www.readbyqxmd.com/read/28100597/investigation-of-a-candida-guilliermondii-pseudo-outbreak-reveals-a-novel-source-of-laboratory-contamination
#1
James E Kirby, Westyn Branch-Elliman, Mary T LaSalvia, Lorinda Longhi, Matthew MacKechnie, Grigoriy Urman, Linda M Baldini, Fatima R Muriel, Bernadette Sullivan, David S Yassa, Howard S Gold, Trevor K Wagner, Daniel J Diekema, Sharon B Wright
Candida guilliermondii was isolated from sterile specimens with increasing frequency over a several-month period despite a paucity of clinical evidence suggesting true Candida infections. However, a healthcare-associated outbreak was strongly considered due to growth patterns in the microbiology laboratory more consistent with true infection than environmental contamination. Therefore, an extensive investigation was performed to identify its cause. With the exception of one case, patient clinical courses were not consistent with true invasive fungal infections...
January 18, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28096617/phenotypic-and-genotypic-characterization-of-locally-isolated-salmonella-strains-used-in-preparation-of-salmonella-antigens-in-egypt
#2
Hazem Mohammed Ibrahim, Dalia Ahmed Mohammed Abd El-Moaty, Hanan Ali Ahmed, Mona Ibrahim El-Enbaawy
AIM: This work was conducted to study the phenotypic and genotypic characterization of locally isolated Salmonella strains (Salmonella Pullorum, Salmonella Enteritidis, and Salmonella Typhimurium) from poultry used in the preparation of Salmonella antigens in Egypt. MATERIALS AND METHODS: The phenotypic characterization of Salmonella strains was done using standard microbiological, biochemical, and serological techniques. Molecular identification was done using different sets of primers on different genes using different polymerase chain reaction (PCR) techniques...
December 2016: Veterinary World
https://www.readbyqxmd.com/read/28094151/comparison-of-the-bd-max-mrsa-xt-to-the-cepheid%C3%A2-xpert%C3%A2-mrsa-assay-for-the-molecular-detection-of-methicillin-resistant-staphylococcus-aureus-from-nasal-swabs
#3
Sanjay R Mehta, Jasmine Estrada, Juan Ybarra, Joshua Fierer
INTRODUCTION: Variation in MRSA genotypes may affect the sensitivity of molecular assays to detect this organism. METHODS: We compared 2 commonly used screening assays, the Cepheid™ Xpert® MRSA and the BD MAX™ MRSA XT on consecutively obtained nasal swabs from 479 subjects. Specimens giving discordant results were subjected to additional microbiologic and molecular testing. RESULTS: Six hundred forty-two (97.6%) of the 658 test results were concordant...
December 16, 2016: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28089661/studying-the-influence-of-formulation-and-process-variables-on-vancomycin-loaded-polymeric-nanoparticles-as-potential-carrier-for-enhanced-ophthalmic-delivery
#4
Carol Yousry, Seham A Elkheshen, Hanan M El-Laithy, Tamer Essam, Rania H Fahmy
Ocular topically applied Vancomycin (VCM) suffers poor bioavailability due to its high molecular weight and hydrophilicity. In the present investigation, VCM-loaded polymeric nanoparticles (PNPs) were developed aiming to enhance its ocular bioavailability through prolonging its release pattern and ophthalmic residence. PNPs were prepared utilizing double emulsion (W/O/O), solvent evaporation technique. 2(3)×4(1) full factorial design was applied to evaluate individual and combined influences of polymer type, Eudragit® RS100, sonication time, and Span®80 concentration on PNPs particle size, encapsulation efficiency, and zeta potential...
January 12, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28078876/comparative-molecular-analysis-of-bacterial-species-associated-with-periodontal-disease
#5
V De Iuliis, S Ursi, L M Di Tommaso, M Caruso, A Marino, S D Ercole, S Caputi, B Sinjari, F Festa, M Macri, S Martinotti, G Vitullo, E Toniato
Periodontal disease is an inflammatory disorder affecting the supporting teeth structures, including gingiva, periodontal ligament and alveolar bone, causing loss of connective tissue, reabsorption of alveolar bone and formation of periodontal pockets. The aim of this study is to find a correlation between bacterial growth and periodontal disease. Fifty-seven patients aged between 21 and 65 years, median age 46 years, were enrolled. According to gingival pocket depth, ranging from 3 to 7 mm, patients were divided into two groups: the first (30 patients, 53%) with deep pockets ³ 5 mm and the second (27 patients, 47%) less than 5 mm...
October 2016: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28067676/severe-community-acquired-pneumonia-optimal-management
#6
Davide Leoni, Jordi Rello
PURPOSE OF REVIEW: Community-acquired pneumonia (CAP) is the leading cause of mortality among infectious diseases. Several efforts have been implemented to achieve better outcomes, but an important proportion of patients continue dying. This review focuses on the newest research on prognostic factors and diagnostics, opening new perspectives in the management of CAP. RECENT FINDINGS: CAP survival improved in recent years despite an increasing incidence of severe presentations...
January 6, 2017: Current Opinion in Infectious Diseases
https://www.readbyqxmd.com/read/28063147/genetic-relatedness-of-faecal-coliforms-and-enterococci-bacteria-isolated-from-water-and-sediments-of-the-apies-river-gauteng-south-africa
#7
Mutshiene Deogratias Ekwanzala, Akebe Luther King Abia, Eunice Ubomba-Jaswa, Jitendra Keshri, Ndombo Benteke Maggy Momba
To date, the microbiological quality of river sediments and its impact on water resources are not included in the water quality monitoring assessment. Therefore, the aim of this study was to establish genetic relatedness between faecal coliforms and enterococci isolated from the river water and riverbed sediments of Apies River to better understand the genetic similarity of microorganisms between the sediment and water phases. Indicator bacteria were subjected to a molecular study, which consisted of PCR amplification and sequence analysis of the 16S rRNA and 23S rRNA gene using specific primers for faecal coliforms and enterococci, respectively...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28061866/rapid-containment-of-nosocomial-transmission-of-a-rare-community-acquired-methicillin-resistant-staphylococcus-aureus-ca-mrsa-clone-responsible-for-the-staphylococcal-scalded-skin-syndrome-ssss
#8
Onofrio Lamanna, Dafne Bongiorno, Lisa Bertoncello, Stefano Grandesso, Sandra Mazzucato, Giovanni Battista Pozzan, Mario Cutrone, Michela Chirico, Flavia Baesso, Pierluigi Brugnaro, Viviana Cafiso, Stefania Stefani, Floriana Campanile
BACKGROUND: The aims of this study were to identify the source and the transmission pathway for a Staphylococcal Scalded Skin Syndrome (SSSS) outbreak in a maternity setting in Italy over 2 months, during 2014; to implement appropriate control measures in order to prevent the epidemic spread within the maternity ward; and to identify the Methicillin-Resistant Staphylococcus aureus (MRSA) epidemic clone. METHODS: Epidemiological and microbiological investigations, based on phenotyping and genotyping methods, were performed...
January 6, 2017: Italian Journal of Pediatrics
https://www.readbyqxmd.com/read/28059472/promoting-active-learning-of-graduate-student-by-deep-reading-in-biochemistry-and-microbiology-pharmacy-curriculum
#9
Ren Peng
To promote graduate students' active learning, deep reading of high quality papers was done by graduate students enrolled in biochemistry and microbiology pharmacy curriculum offered by college of life science, Jiangxi Normal University from 2013 to 2015. The number of graduate students, who participated in the course in 2013, 2014, and 2015 were eleven, thirteen and fifteen, respectively. Through deep reading of papers, presentation, and group discussion in the lecture, these graduate students have improved their academic performances effectively, such as literature search, PPT document production, presentation management, specialty document reading, academic inquiry, and analytical and comprehensive ability...
January 6, 2017: Biochemistry and Molecular Biology Education
https://www.readbyqxmd.com/read/28059049/evaluation-of-the-3m%C3%A2-molecular-detection-assay-mda-2-listeria-monocytogenes-for-the-detection-of-listeria-monocytogenes-in-select-foods-and-environmental-surfaces-collaborative-study-first-action-2016-08
#10
Patrick Bird, Jonathan Flannery, Erin Crowley, James Agin, David Goins, Lisa Monteroso
The 3M<sup>™</sup> Molecular Detection Assay (MDA) 2 <em>- Listeria </em>uses loop-mediated isothermal amplification and bioluminescence detection to rapidly detect <em>Listeria </em>spp. in a broad range of food types and environmental surfaces. Using an unpaired study design, the MDA 2 - <em>Listeria </em>was compared to the U.S. Department of Agriculture Food Safety and Inspection Service <em>Microbiology Laboratory Guidebook </em>Chapter 8.09 "<em>Isolation and Identification of Listeria monocytogenes from Red Meat, Poultry, and Egg Products, and Environmental Samples</em>" reference method for the detection of <em>Listeria </em>in deli turkey and raw chicken breast fillet...
November 17, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/28056827/strain-specific-transmission-in-an-outbreak-of-esbl-producing-enterobacteriaceae-in-the-hemato-oncology-care-unit-a-cohort-study
#11
Makiko Uemura, Osamu Imataki, Shumpei Uchida, Haruyuki Nakayama-Imaohji, Yukiko Ohue, Harumi Matsuka, Hatsune Mori, Hiroaki Dobashi, Tomomi Kuwahara, Norimitsu Kadowaki
BACKGROUND: Extended-spectrum β-lactamase (ESBL)-producing bacteria are resistant to several types of antibiotics excluding carbapenems. A transmissibility of ESBL-producing Enterobacteriaceae would be depending on each bacterial property, however, that has not been elucidated in clinical setting. In this study, we attempted to identify the source of an outbreak of ESBL-producing bacteria in a medical oncology and immunology care unit. METHODS: An ESBL-producing Enterobacteriaceae (ESBL-E) outbreak observed between July 2012 and August 2012 in Kagawa University Hospital was surveyed using various molecular microbiology techniques...
January 5, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28055574/guidelines-for-the-detection-of-rickettsia-spp
#12
Aránzazu Portillo, Rita de Sousa, Sonia Santibáñez, Ana Duarte, Sophie Edouard, Isabel P Fonseca, Cátia Marques, Marketa Novakova, Ana M Palomar, Marcos Santos, Cornelia Silaghi, Laura Tomassone, Sara Zúquete, José A Oteo
The genus Rickettsia (Rickettsiales: Rickettsiaceae) includes Gram-negative, small, obligate intracellular, nonmotile, pleomorphic coccobacilli bacteria transmitted by arthropods. Some of them cause human and probably also animal disease (life threatening in some patients). In these guidelines, we give clinical practice advices (microscopy, serology, molecular tools, and culture) for the microbiological study of these microorganisms in clinical samples. Since in our environment rickettsioses are mainly transmitted by ticks, practical information for the identification of these arthropods and for the study of Rickettsia infections in ticks has also been added...
January 2017: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/28054415/characterizing-the-effect-of-polymyxin-b-antibiotics-to-lipopolysaccharide-on-escherichia%C3%A2-coli-surface-using-atomic-force-microscopy
#13
Yoo Jin Oh, Birgit Plochberger, Markus Rechberger, Peter Hinterdorfer
Lipopolysaccharide (LPS) on gram-negative bacterial outer membranes is the first target for antimicrobial agents, due to their spatial proximity to outer environments of microorganisms. To develop antibacterial compounds with high specificity for LPS binding, the understanding of the molecular nature and their mode of recognition is of key importance. In this study, atomic force microscopy (AFM) and single molecular force spectroscopy were used to characterize the effects of antibiotic polymyxin B (PMB) to the bacterial membrane at the nanoscale...
January 5, 2017: Journal of Molecular Recognition: JMR
https://www.readbyqxmd.com/read/28054229/primary-subacute-epiphyseal-osteomyelitis-caused-by-mycobacterium-species-in-young-children-a-modern-diagnostic-approach
#14
REVIEW
N El Houmami, P Minodier, C Bouvier, H Seligmann, J-L Jouve, D Raoult, P-E Fournier
Primary epiphyseal subacute osteomyelitis (PESAO) caused by Mycobacterium species in young children is poorly recognized. We aimed to define the spectrum of this uncommon condition and to propose a novel diagnostic approach. We performed a systematic review of the literature on the PubMed website by selecting all reports of isolated infantile PESAO caused by Mycobacterium species since 1975. We identified 350 citations, of which 174 were assessed for eligibility based on title and abstract. The full text of 81 eligible citations was screened, and relevant data of 15 children under 4 years of age with mycobacterial PESAO were extracted...
January 5, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28049457/breathdx-molecular-analysis-of-exhaled-breath-as-a-diagnostic-test-for-ventilator-associated-pneumonia-protocol-for-a-european-multicentre-observational-study
#15
Pouline M P van Oort, Tamara Nijsen, Hans Weda, Hugo Knobel, Paul Dark, Timothy Felton, Nicholas J W Rattray, Oluwasola Lawal, Waqar Ahmed, Craig Portsmouth, Peter J Sterk, Marcus J Schultz, Tetyana Zakharkina, Antonio Artigas, Pedro Povoa, Ignacio Martin-Loeches, Stephen J Fowler, Lieuwe D J Bos
BACKGROUND: The diagnosis of ventilator-associated pneumonia (VAP) remains time-consuming and costly, the clinical tools lack specificity and a bedside test to exclude infection in suspected patients is unavailable. Breath contains hundreds to thousands of volatile organic compounds (VOCs) that result from host and microbial metabolism as well as the environment. The present study aims to use breath VOC analysis to develop a model that can discriminate between patients who have positive cultures and who have negative cultures with a high sensitivity...
January 3, 2017: BMC Pulmonary Medicine
https://www.readbyqxmd.com/read/28043600/benefits-and-challenges-of-molecular-diagnostics-for-childhood-tuberculosis
#16
Cristina Gutierrez
Expanding tuberculosis (TB)-diagnostic services, including access to rapid tests, is a World Health Organization (WHO) strategy to accelerate progress toward ending TB. Faster and more sensitive molecular tests capable of diagnosing TB and drug-resistant TB have the technical capacity to address limitations associated with smears and cultures by increasing accuracy and shortening turnaround times as compared with those of these conventional laboratory methods. Nucleic acid amplification assays used to detect and analyze Mycobacterium tuberculosis (MTB)-complex nucleic acids can be used directly on specimens from patients suspected of having TB...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28043503/isoniazid-resistance-among-rifampicin-susceptible-mycobacterium-tuberculosis-isolates-from-tuberculosis-patients
#17
Jyoti Arora, Ritu Singhal, Ajoy Kumar Verma, Gavish Kumar, Manpreet Bhalla, Rohit Sarin, Vithal Prasad Myneedu
OBJECTIVE/BACKGROUND: With the introduction of novel molecular techniques that rely on rifampicin (RIF) susceptibility, resistance to isoniazid (INH) or other first-line drugs remains undetected. Such patients are prescribed first-line antituberculosis therapy and are on RIF monodrug therapy during the continuation phase, which may lead to therapeutic failure and emergence of multidrug resistance. We aimed to study INH resistance among RIF-susceptible Mycobacterium tuberculosis (MTB) isolates from retreatment patients...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28042011/application-of-next-generation-sequencing-in-clinical-microbiology-and-infection-prevention
#18
Ruud H Deurenberg, Erik Bathoorn, Monika A Chlebowicz, Natacha Couto, Mithila Ferdous, Silvia García-Cobos, Anna M D Kooistra-Smid, Erwin C Raangs, Sigrid Rosema, Alida C M Veloo, Kai Zhou, Alexander W Friedrich, John W A Rossen
Current molecular diagnostics of human pathogens provide limited information that is often not sufficient for outbreak and transmission investigation. Next generation sequencing (NGS) determines the DNA sequence of a complete bacterial genome in a single sequence run, and from these data, information on resistance and virulence, as well as information for typing is obtained, useful for outbreak investigation. The obtained genome data can be further used for the development of an outbreak-specific screening test...
December 29, 2016: Journal of Biotechnology
https://www.readbyqxmd.com/read/28039342/meningococcal-disease-has-the-battle-been-won
#19
REVIEW
Beverley C Millar, P J A Moore, J E Moore
Meningococcal disease is a worldwide life-threatening infection associated in many cases with debilitating long-term sequelae, both within the military and civilian populations. Military recruits are at a higher risk of acquiring this infection due to numerous factors, such as young recruits in the age group 18-25 years, high carriage rates of meningococci, communal and crowed living quarters and global deployment or training in regions with different meningococcal serogroup epidemiology. Although these increased risk factors among young recruits remain, the increased incidence of disease is now historic...
December 30, 2016: Journal of the Royal Army Medical Corps
https://www.readbyqxmd.com/read/28031438/integrating-advanced-molecular-technologies-into-public-health
#20
Marta Gwinn, Duncan R MacCannell, Rima F Khabbaz
Advances in laboratory and information technologies are transforming public health microbiology. High-throughput genome sequencing and bioinformatics are enhancing our ability to investigate and control outbreaks, detect emerging infectious diseases, develop vaccines, and combat antimicrobial resistance-all with increased accuracy, timeliness, and efficiency. The Advanced Molecular Detection (AMD) initiative has allowed the Centers for Disease Control and Prevention (CDC) to provide leadership and coordination in integrating new technologies into routine practice throughout the US public health laboratory system...
December 28, 2016: Journal of Clinical Microbiology
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