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https://www.readbyqxmd.com/read/28900246/maldi-tof-ms-based-identification-and-molecular-characterization-of-food-associated-methicillin-resistant-staphylococcus-aureus
#1
H M Manukumar, S Umesha
Food-borne methicillin resistant Staphylococcus aureus (MRSA) is involved in two-fold higher mortality rate compared to methicillin susceptible S. aureus (MSSA). Eventhough Mysuru recognized as cleanest city in the world, prevalence of food contamination is not detailed. The aim is to screen food samples from Mysuru area and to characterize MRSA strain, employing MALDI-Biotyper, multiplex PCR to distinguish between MRSA and MSSA by PCR-coupled single strand conformation polymorphism (PCR-SSCP). Of all the food-borne pathogens, S...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28887200/purification-and-characterization-of-a-novel-anti-staphylococcal-peptide-asp-1-from-bacillus-sp-urid-12-1
#2
Ajay Ghosh Chalasani, Utpal Roy, Sushma Nema
A strong anti-methicillin resistant Staphylococcus aureus (MRSA) peptide (ASP-1) from the Bacillus subtilis URID 12.1 strain that is active against cefoxitin- and methicillin-resistant clinical isolates was purified to homogeneity by solvent extraction, silica gel-based adsorption chromatography and reversed phase High Performance Liquid Chromatography. The peptide sequence of ASP-1 as determined by MALDI-TOF/MS and ESI-FTICR MS was acetylated Phe-Thr-Ala-Val-Dhb-Phe-Ile/Leu. The peptide was further analyzed by alkaline hydrolysis, ESI-Q-TOF-MS and an ion mobility assay, which detected the presence of a lactone ring in the intact peptide and a cyclic nature, subsequently revealing the peptide sequence as acPhe-Thr-Val-Ala-Dhb-Phe-Ile/Leu...
September 5, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28831593/impact-of-rapid-diagnosis-of-staphylococcus-aureus-bacteremia-from-positive-blood-cultures-on-patient-management
#3
M P Romero-Gómez, E Cendejas-Bueno, J García Rodriguez, J Mingorance
We have performed a retrospective, before-after comparison of turnaround time and therapy adjustment parameters before and after the introduction of matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) plus mecA polymerase chain reaction (PCR) for the identification of methicillin-resistant Staphylococcus aureus (MRSA) in positive blood cultures. There were 227 episodes of S. aureus bacteremia during the study periods. The pre-MALDI-TOF and post-MALDI-TOF groups included 133 and 94 patients, respectively...
August 23, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28430811/antimicrobial-resistance-in-coagulase-positive-staphylococci-isolated-from-companion-animals-in-australia-a-one-year-study
#4
Sugiyono Saputra, David Jordan, Kate A Worthing, Jacqueline M Norris, Hui S Wong, Rebecca Abraham, Darren J Trott, Sam Abraham
Methicillin-resistant coagulase-positive staphylococci (CoPS) have become increasingly recognised as opportunistic pathogens that limit therapeutic options in companion animals. The frequency of methicillin resistance amongst clinical isolates on an Australia-wide level is unknown. This study determined antimicrobial susceptibility patterns for CoPS isolated from clinical infections in companion animals (dogs, cats and horses) as part of the first nation-wide survey on antimicrobial resistance in animal pathogens in Australia for a one-year period (January 2013 to January 2014)...
2017: PloS One
https://www.readbyqxmd.com/read/28421046/horses-in-denmark-are-a-reservoir-of-diverse-clones-of-methicillin-resistant-and-susceptible-staphylococcus-aureus
#5
Md Zohorul Islam, Carmen Espinosa-Gongora, Peter Damborg, Raphael N Sieber, Rikke Munk, Louise Husted, Arshnee Moodley, Robert Skov, Jesper Larsen, Luca Guardabassi
Denmark is a country with high prevalence of livestock-associated methicillin-resistant Staphylococcus aureus (MRSA) clonal complex (CC) 398 in pigs. Even though pig farming is regarded as the main source of human infection or colonization with MRSA CC398, 10-15% of the human cases appear not to be linked to pigs. Following the recent reports of MRSA CC398 in horses in other European countries and the lack of knowledge on S. aureus carriage in this animal species, we carried out a study to investigate whether horses constitute a reservoir of MRSA CC398 in Denmark, and to gain knowledge on the frequency and genetic diversity of S...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28316631/potential-impact-of-rapid-blood-culture-testing-for-gram-positive-bacteremia-in-japan-with-the-verigene-gram-positive-blood-culture-test
#6
Ken Kikuchi, Mari Matsuda, Shigekazu Iguchi, Tomonori Mizutani, Keiichi Hiramatsu, Michiru Tega-Ishii, Kaori Sansaka, Kenta Negishi, Kimie Shimada, Jun Umemura, Shigeyuki Notake, Hideji Yanagisawa, Hiroshi Takahashi, Reiko Yabusaki, Hideki Araoka, Akiko Yoneyama
Background. Early detection of Gram-positive bacteremia and timely appropriate antimicrobial therapy are required for decreasing patient mortality. The purpose of our study was to evaluate the performance of the Verigene Gram-positive blood culture assay (BC-GP) in two special healthcare settings and determine the potential impact of rapid blood culture testing for Gram-positive bacteremia within the Japanese healthcare delivery system. Furthermore, the study included simulated blood cultures, which included a library of well-characterized methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci (VRE) isolates reflecting different geographical regions in Japan...
2017: Canadian Journal of Infectious Diseases & Medical Microbiology
https://www.readbyqxmd.com/read/28091797/mass-spectrometric-identification-of-phenol-soluble-modulins-in-the-atcc%C3%A2-43300-standard-strain-of-methicillin-resistant-staphylococcus-aureus-harboring-two-distinct-phenotypes
#7
K S Jang, M Park, J Y Lee, J S Kim
Staphylococcus aureus subsp. aureus Rosenbach (ATCC® 43300™) is a representative methicillin-resistant S. aureus (MRSA) strain that is used as a quality control strain for testing the methicillin susceptibility of clinical isolates. It has been consistently observed that colonies with two different colors (golden yellow and white) grow from the ATCC stock on blood agar plates. In this study, staphylococcal peptide and protein profiling was performed using matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry...
January 14, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/27896481/high-perineal-and-overall-frequency-of-staphylococcus-aureus-in-people-who-inject-drugs-compared-to-non-injectors
#8
Disa Dahlman, Farnaz Jalalvand, Marianne Alanko Blomé, Anders Håkansson, Håkan Janson, Susanne Quick, Anna C Nilsson
To investigate the prevalence, distribution, and colonization burden of Staphylococcus aureus (S. aureus) and MRSA in different body sites among people who inject drugs (PWID) and compare it to a control group consisting of non-injectors. In this cross-sectional survey, 49 active PWID from the needle exchange program (NEP) in Malmö, Sweden, and 60 non-injecting controls from an emergency psychiatric inpatient ward at Malmö Addiction Centre were tested for S. aureus (including MRSA) by culture, PCR, and MALDI-TOF...
February 2017: Current Microbiology
https://www.readbyqxmd.com/read/27866257/detection-of-methicillin-resistant-staphylococcus-aureus-using-phage-amplification-combined-with-matrix-assisted-laser-desorption-ionization-mass-spectrometry
#9
Jon C Rees, John R Barr
Antibiotic resistance continues to contribute significantly to morbidity and mortality across the world. Developing new tests for antibiotic-resistant bacteria is a core action to combat resistant infections. We describe a method that uses phage amplification detection (PAD) combined with matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) to rapidly identify Staphylococcus aureus and determine phenotypic susceptibility to cefoxitin. Samples tested for S. aureus are incubated together with bacteriophage in the presence and absence of cefoxitin and subjected to rapid trypsin digestion followed by MALDI-MS analysis...
February 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27598775/low-enteric-colonization-with-multidrug-resistant-pathogens-in-soldiers-returning-from-deployments-experience-from-the-years-2007-2015
#10
Hagen Frickmann, Dorothea Wiemer, Claudia Frey, Ralf Matthias Hagen, Rebecca Hinz, Andreas Podbielski, Thomas Köller, Philipp Warnke
This assessment describes the enteric colonization of German soldiers 8-12 weeks after returning from mostly but not exclusively subtropical or tropical deployment sites with third-generation cephalosporin-resistant Enterobacteriaceae, vancomycin-resistant enterococci (VRE), and methicillin-resistant Staphylococcus aureus (MRSA). Between 2007 and 2015, 828 stool samples from returning soldiers were enriched in nonselective broth and incubated on selective agars for Enterobacteriaceae expressing extended-spectrum beta-lactamases (ESBL), VRE and MRSA...
2016: PloS One
https://www.readbyqxmd.com/read/27568365/the-presence-of-a-single-maldi-tof-mass-spectral-peak-predicts-methicillin-resistance-in-staphylococci
#11
Daniel D Rhoads, Hannah Wang, James Karichu, Sandra S Richter
The class A mec gene complex also carries the psm-mec gene. The psm-mec gene product can be detected as a peak near 2415m/z using matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS). The correlation of a 2415m/z peak with methicillin resistance (mecA carriage) in consecutive staphylococcal blood culture isolates was evaluated. A 2415±2.00m/z peak was observed in 37% (51/137) of methicillin-resistant Staphylococcus aureus, in none (0/146) of the methicillin-susceptible S...
November 2016: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/27559120/comparative-in-vitro-activities-of-ceftaroline-and-ceftriaxone-against-bacterial-pathogens-associated-with-respiratory-tract-infections-results-from-the-aware-surveillance-study
#12
D J Biedenbach, J P Iaconis, D F Sahm
OBJECTIVES: Ceftaroline fosamil is indicated for the treatment of community-acquired bacterial pneumonia and ceftriaxone has an indication for lower respiratory tract infections. This study was conducted to compare the relative in vitro activities of these two agents against bacterial species associated with community-associated respiratory tract infections. METHODS: In all, 13 005 isolates of Staphylococcus aureus, Streptococcus pneumoniae, Moraxella catarrhalis and Haemophilus influenzae were collected in 2012-14 from 39 countries in the Asia-Pacific region, Europe, Latin America and Africa-Middle East from respiratory tract specimens...
December 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27461798/in-vitro-activity-of-ceftaroline-against-bacterial-pathogens-isolated-from-patients-with-skin-and-soft-tissue-and-respiratory-tract-infections-in-african-and-middle-eastern-countries-aware-global-surveillance-program-2012-2014
#13
James A Karlowsky, Douglas J Biedenbach, Samuel K Bouchillon, Meredith Hackel, Joseph P Iaconis, Daniel F Sahm
The objective of this report was to document antimicrobial susceptibility testing surveillance data for ceftaroline and comparative agents from the AWARE (Assessing Worldwide Antimicrobial Resistance Evaluation) global surveillance program for bacterial pathogens causing skin and soft tissue and respiratory tract infections in African and Middle Eastern countries from 2012 through 2014. Pathogen identities were confirmed by MALDI-TOF and antimicrobial susceptibility testing performed by CLSI broth microdilution methodology in a central laboratory...
October 2016: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/27364641/performance-of-maldi-biotyper-compared-with-vitek-%C3%A2-2-compact-system-for-fast-identification-and-discrimination-of-staphylococcus-species-isolated-from-bovine-mastitis
#14
COMPARATIVE STUDY
Ayman Elbehiry, Musaad Al-Dubaib, Eman Marzouk, Salama Osman, Husam Edrees
This study was designed to evaluate the ability of MALDI Biotyper (MBT) compared with Vitek(™) 2 compact system for accurate identification of Staphylococcus aureus (S. aureus) and coagulase-negative staphylococci (CNS) strains and discriminate methicillin-sensitive S. aureus (MSSA) from methicillin-resistant S. aureus (MRSA). Throughout Al-Qassim region, Saudi Arabia, a total of 198 isolates of S. aureus (132 MSSA and 66 MRSA) and 44 CNS were collected from five dairy farms where the prevalence of staphylococcal mastitis was reported...
December 2016: MicrobiologyOpen
https://www.readbyqxmd.com/read/27344933/maldi-tof-ms-typing-of-a-nosocomial-methicillin-resistant-staphylococcus-aureus-outbreak-in-a-neonatal-intensive-care-unit
#15
Deborah Steensels, Ariane Deplano, Olivier Denis, Anne Simon, Alexia Verroken
BACKGROUND: The early detection of a methicillin-resistant Staphylococcus aureus (MRSA) outbreak is decisive to control its spread and rapidly initiate adequate infection control measures. Therefore, prompt determination of epidemiologic relatedness of clinical MRSA isolates is essential. Genetic typing methods have a high discriminatory power but their availability remains restricted. In this study, we aimed to challenge matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) as a typing tool of a nosocomial MRSA outbreak in a neonatal intensive care unit...
August 2017: Acta Clinica Belgica
https://www.readbyqxmd.com/read/27301970/a-new-synthetic-peptide-with-in-vitro%C3%A2-antibacterial-potential-against-escherichia-coli-o157-h7-and-methicillin-resistant-staphylococcus-aureus-mrsa
#16
Y A Prada, F Guzmán, P Rondón, P Escobar, C Ortíz, D A Sierra, R Torres, E Mejía-Ospino
In this work, we performed the rational design of a cationic antimicrobial peptide, GIBIMPY4, using the software DEPRAMPs developed at the GIBIM research group. GIBIMPY4 has a length of 17 amino acids, it is amphipathic, its structure is α-helix and it has a net charge of (+5). Solid-phase peptide synthesis was performed using the Fmoc strategy in acid medium. The primary structure was confirmed by MALDI-TOF mass spectrometry. The antimicrobial activity of the peptide was evaluated by broth microdilution method by measuring optical density in 96-well microplates...
September 2016: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/27221546/rapid-detection-of-meticillin-resistant-staphylococcus-aureus-bacteraemia-using-combined-three-hour-short-incubation-matrix-assisted-laser-desorption-ionization-time-of-flight-ms-identification-and-alere-culture-colony-pbp2a-detection-test
#17
Johannes Andries Delport, Ivor Mohorovic, Sandi Burn, John Kenneth McCormick, David Schaus, Robert Lannigan, Michael John
Meticillin-resistant Staphylococcus aureus (MRSA) bloodstream infection is responsible for significant morbidity, with mortality rates as high as 60 % if not treated appropriately. We describe a rapid method to detect MRSA in blood cultures using a combined three-hour short-incubation BRUKER matrix-assisted laser desorption/ionization time-of-flight MS BioTyper protocol and a qualitative immunochromatographic assay, the Alere Culture Colony Test PBP2a detection test. We compared this combined method with a molecular method detecting the nuc and mecA genes currently performed in our laboratory...
July 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/27211209/in-vitro-activity-of-dalbavancin-against-multidrug-resistant-staphylococcus-aureus-and-streptococci-from-patients-with-documented-infections-in-europe-and-surrounding-regions-2011-2013
#18
Michael D Huband, Mariana Castanheira, David J Farrell, Robert K Flamm, Ronald N Jones, Helio S Sader, Rodrigo E Mendes
The in vitro activity of dalbavancin was evaluated against 9303 Staphylococcus aureus and 2670 streptococci, including multidrug-resistant (MDR) isolates, collected from hospitalised patients in Europe and surrounding regions from 2011 to 2013. Dalbavancin recently received approval for the treatment of acute bacterial skin and skin-structure infections by the US Food and Drug Administration (FDA) and the European Medicines Agency. Bacterial identification was confirmed by standard microbiological methods (including MALDI-TOF), and susceptibility testing was performed by reference broth microdilution methods...
June 2016: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/27192668/matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-can-detect-staphylococcus-aureus-clonal-complex-398
#19
Marlène Sauget, Nathalie van der Mee-Marquet, Xavier Bertrand, Didier Hocquet
Within the last decade methicillin-resistant Staphylococcus aureus belonging to CC398 has become a worldwide threat associated with livestock. More recently, methicillin-susceptible S. aureus (MSSA) belonging to CC398 have been increasingly reported as a cause of invasive infections in patients without livestock contact. It appears therefore necessary to implement a convenient tool for the surveillance this emerging pathogen. We evaluated the MALDI-TOF MS as a tool for rapid detection of S. aureus CC398. We used 626 S...
August 2016: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/26958032/comparison-of-identification-and-antimicrobial-resistance-pattern-of-staphylococcus-aureus-isolated-from-amassoma-bayelsa-state-nigeria
#20
COMPARATIVE STUDY
Funmilola Abidemi Ayeni, Tombari Gbarabon, Camilla Andersen, Niels Norskov-Lauritsen
BACKGROUND: Staphylococcus aureus is often responsible for fatal infections and recent upsurge of resistant strains has resulted in therapeutic failure. The identification of this microorganism is a major challenge to medical microbiologists in developing countries. METHODS: One hundred and eighty five isolates which had been previously isolated from the nares of 185 healthy college students' volunteers in Amassoma, Bayelsa State, South Nigeria were identified by MALDI TOF mass spectrometry, and PCR amplification of the spa gene...
December 2015: African Health Sciences
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