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https://www.readbyqxmd.com/read/29555636/genetic-determinants-of-high-level-oxacillin-resistance-in-mrsa
#1
Maria Pardos de la Gandara, Vitor Borges, Marilyn Chung, Catarina Milheiriço, João Paulo Gomes, Herminia de Lencastre, Alexander Tomasz
Methicillin-resistant Staphylococcus aureus (MRSA) strains carry either a mecA - or a mecC -mediated mechanism of resistance to beta-lactam antibiotics and the phenotypic expression of resistance shows extensive strain-to-strain variation. In recent communications we identified genetic determinants associated with the stringent stress response that play a major role in the antibiotic resistant phenotype of the historically earliest "archaic" clone of MRSA and in the mecC carrying MRSA strain LGA251...
March 19, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29524153/small-mammals-as-sentinels-of-antimicrobial-resistant-staphylococci
#2
Vladimír Kmeť, Anna Čuvalová, Michal Stanko
A total of 39 coagulase-negative staphylococci and seven Staphylococcus aureus strains were isolated from small mammal feces, i.e., the striped field mouse (Apodemus agrarius) and the yellow-necked mouse (A. flavicollis) in two sampling areas, deciduous forest and karst plains. MALDI-TOF analysis revealed five species of coagulase-negative staphylococci: S. sciuri, S. hominis, S. warneri, S. haemolyticus, and S. xylosus. All strains were susceptible to tetracycline, linezolid, vancomycin, and teicoplanin. Three MRSA strains with the mecA gene were detected...
March 9, 2018: Folia Microbiologica
https://www.readbyqxmd.com/read/29468193/scc-mec-finder-a-web-based-tool-for-typing-of-staphylococcal-cassette-chromosome-mec-in-staphylococcus-aureus-using-whole-genome-sequence-data
#3
Hülya Kaya, Henrik Hasman, Jesper Larsen, Marc Stegger, Thor Bech Johannesen, Rosa Lundbye Allesøe, Camilla Koldbæk Lemvigh, Frank Møller Aarestrup, Ole Lund, Anders Rhod Larsen
Typing of methicillin-resistant Staphylococcus aureus (MRSA) is important in infection control and surveillance. The current nomenclature of MRSA includes the genetic background of the S. aureus strain determined by multilocus sequence typing (MLST) or equivalent methods like spa typing and typing of the mobile genetic element staphylococcal cassette chromosome mec (SCC mec ), which carries the mecA or mecC gene. Whereas MLST and spa typing are relatively simple, typing of SCC mec is less trivial because of its heterogeneity...
January 2018: MSphere
https://www.readbyqxmd.com/read/29426410/diversity-of-methicillin-resistant-staphylococcus-aureus-mrsa-isolated-from-austrian-ruminants-and-new-world-camelids
#4
B Schauer, R Krametter-Frötscher, F Knauer, R Ehricht, S Monecke, A T Feßler, S Schwarz, T Grunert, J Spergser, I Loncaric
The aim of this study was to determine the prevalence, the antimicrobial resistance patterns and the genetic diversity of methicillin-resistant Staphylococcus aureus (MRSA) from Austrian ruminants and New World camelids that were treated at the University of Veterinary Medicine, Vienna. Between April 2014 and January 2017, 723 nasal swabs originating from ruminants and New World camelids were examined. MRSA isolates were characterized by mecA/mecA1/mecC PCRs and by DNA microarray analysis. They were genotyped by spa typing, dru typing, MLST and MLVA...
February 2018: Veterinary Microbiology
https://www.readbyqxmd.com/read/29410104/evaluation-of-a-novel-optical-assay-for-rapid-detection-of-methicillin-resistant-staphylococcus-aureus-in-liquid-culture
#5
Dennis Knaack, Evgeny A Idelevich, Barbara Körber-Irrgang, Michael Kresken, Karsten Becker
Valid detection of methicillin-resistant Staphylococcus aureus (MRSA) is a precondition for MRSA prevention measures. Most of the available MRSA screening tests are based either on the identification of colony material grown on solid agar media or on direct molecular approaches. The HB&L MRSA KIT (Alifax, Polverara, Italy) is designed to screen for MRSA in liquid cultures applying the light scattering technology. Here, the assay was evaluated with pure culture isolates from solid agar media on a representative subset of 29 MRSA and 171 methicillin-susceptible S...
March 2018: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/29350135/plasmid-encoded-transferable-mecb-mediated-methicillin-resistance-in-staphylococcus-aureus
#6
Karsten Becker, Sarah van Alen, Evgeny A Idelevich, Nina Schleimer, Jochen Seggewiß, Alexander Mellmann, Ursula Kaspar, Georg Peters
During cefoxitin-based nasal screening, phenotypically categorized methicillin-resistant Staphylococcus aureus (MRSA) was isolated and tested negative for the presence of the mecA and mecC genes as well as for the SCCmec-orfX junction region. The isolate was found to carry a mecB gene previously described for Macrococcus caseolyticus but not for staphylococcal species. The gene is flanked by β-lactam regulatory genes similar to mecR, mecI, and blaZ and is part of an 84.6-kb multidrug-resistance plasmid that harbors genes encoding additional resistances to aminoglycosides (aacA-aphD, aphA, and aadK) as well as macrolides (ermB) and tetracyclines (tetS)...
February 2018: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/29118173/-mecc-harboring-methicillin-resistant-staphylococcus-aureus-hiding-in-plain-sight
#7
Bradley A Ford
Previously there was scant data on the performance of laboratory testing to detect mecC -mediated beta-lactam resistance in Staphylococcus aureus Kriegeskorte and colleagues (J Clin Microbiol 56:e00826-17, 2018, https://doi.org/10.1128/JCM.00826-17) report the performance of various clinical tests for the detection of mecC -harboring methicillin-resistant S. aureus (MRSA), which failed to identify from 0 to 41% of tested mecC -harboring MRSA isolates. Changes in practice and new test development are necessary to address the challenge of mecC -harboring MRSA...
January 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29063353/high-prevalence-and-antimicrobial-resistance-of-meca-staphylococcus-aureus-in-dairy-cattle-sheep-and-goat-bulk-tank-milk-in-jordan
#8
Mohammad M Obaidat, Alaa E Bani Salman, Amira A Roess
The aim of this study was to determine the prevalence and antimicrobial resistance of mecA and mecC methicillin-resistant Staphylococcus aureus (MRSA) in cattle, sheep, and goat dairy farms in Jordan. Milk samples were collected from bulk tanks at 117 dairy farms (44 cattle, 47 sheep, and 26 goat dairy farms) in each region of the country. MRSA were isolated on mecA and mecC chromogenic media and confirmed by PCR. The confirmed isolates were tested for resistance toward 15 antimicrobials by the disc diffusion method...
February 2018: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/28978682/comparison-of-different-phenotypic-approaches-to-screen-and-detect-mecc-harboring-methicillin-resistant-staphylococcus-aureus
#9
André Kriegeskorte, Evgeny A Idelevich, Andreas Schlattmann, Franziska Layer, Birgit Strommenger, Olivier Denis, Gavin K Paterson, Mark A Holmes, Guido Werner, Karsten Becker
Similar to mecA , mecC confers resistance against beta-lactams, leading to the phenotype of methicillin-resistant Staphylococcus aureus (MRSA). However, mecC -harboring MRSA strains pose special difficulties in their detection. The aim of this study was to assess and compare different phenotypic systems for screening, identification, and susceptibility testing of mecC -positive MRSA isolates. A well-characterized collection of mecC -positive S. aureus isolates ( n = 111) was used for evaluation. Routinely used approaches were studied to determine their suitability to correctly identify mecC -harboring MRSA, including three (semi)automated antimicrobial susceptibility testing (AST) systems and five selective chromogenic agar plates...
January 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28941908/prevalence-of-staphylococcus-aureus-and-of-methicillin-resistant-s-%C3%A2-aureus-mrsa-along-the-production-chain-of-dairy-products-in-north-western-greece
#10
Panagiotis Papadopoulos, Theofilos Papadopoulos, Apostolos S Angelidis, Evridiki Boukouvala, Antonios Zdragas, Anna Papa, Christos Hadjichristodoulou, Daniel Sergelidis
The objective of this study was to estimate the prevalence of methicillin-resistant Staphylococcus aureus (MRSA) in the production chain of dairy products. Of 367 tested samples (36 bulk tank milk (BTM), 19 dairy products, 72 human, 185 animal, 55 equipment), 212 (57.8%) were found positive for S. aureus. Almost all isolates (99.6%) were resistant to at least one antimicrobial and 13.3% were multi-drug resistant (MDR), exhibiting resistance to three or more antibiotic classes. Eleven samples (3%) were found contaminated by MRSA carrying the mecA gene...
February 2018: Food Microbiology
https://www.readbyqxmd.com/read/28904189/comparison-of-automated-antimicrobial-susceptibility-testing-systems-to-detect-mecc-positive-methicillin-resistant-staphylococcus-aureus
#11
LETTER
Camille Kolenda, Céline Dupieux, Jean-Winoc Decousser, Anders Rhod Larsen, Bruno Pichon, Mark Holmes, Michèle Bès, Christopher Teale, Elizabeth Dickson, Robert Hill, Robert Skov, Angela Kearns, Frédéric Laurent
No abstract text is available yet for this article.
December 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28893360/borderline-oxacillin-resistant-staphylococcus-aureus-borsa-a-more-common-problem-than-expected
#12
REVIEW
Maria M Hryniewicz, Katarzyna Garbacz
Borderline oxacillin-resistant Staphylococcus aureus (BORSA) represents a quite poorly understood and inadequately defined phenotype of methicillin resistance. BORSA strains show low, borderline resistance to penicillinase-resistant penicillins (PRPs), with oxacillin MICs typically equal to 1-8 µg ml(-1), and in contrast to methicillin-resistant S. aureus (MRSA), do not have an altered penicillin-binding protein, PBP2a, encoded by the mecA or mecC gene. Their resistance is typically associated with hyperproduction of beta-lactamases or, in some cases, point mutations in PBP genes...
October 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28783429/characterization-of-livestock-associated-methicillin-resistant-staphylococcus-aureus-cc398-and-mecc-positive-cc130-from-zoo-animals-in-the-united-kingdom
#13
Alessio Bortolami, Ranieri Verin, Julian Chantrey, Michela Corrò, Ian Ashpole, Javier Lopez, Dorina Timofte
Little is known about the characteristics and diseases associated with methicillin-resistant Staphylococcus aureus (MRSA) in nondomestic animals. Four presumptive MRSA isolates, obtained from clinical (n = 3) and surveillance specimens (n = 1) from dwarf (Helogale parvula) and yellow mongooses (Cynictis penicillata) from a United Kingdom zoo, were analyzed by PCR for detection of mecA and mecC-mediated methicillin resistance, and virulence genes. Isolates were genotyped by multilocus sequence typing (MLST) and staphylococcal cassette chromosome mec (SCCmec) and spa sequence typing...
October 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28780098/prevalence-and-characterization-of-methicillin-resistant-staphylococcus-aureus-carrying-meca-or-mecc-and-methicillin-susceptible-staphylococcus-aureus-in-dairy-sheep-farms-in-central-italy
#14
G Giacinti, V Carfora, A Caprioli, D Sagrafoli, N Marri, G Giangolini, R Amoruso, M Iurescia, F Stravino, S Dottarelli, F Feltrin, A Franco, S Amatiste, A Battisti
Between January and May 2012, a total of 286 bulk tank milk samples from dairy sheep farms located in central Italy were tested for the presence of Staphylococcus aureus. One hundred fifty-three samples were positive for S. aureus (53.5%), with an average count of 2.53 log cfu/mL. A total of 679 S. aureus colonies were screened for methicillin resistance by the cefoxitin disk diffusion test, and 104 selected cefoxitin-susceptible isolates were also tested for their susceptibility to other antimicrobials representative of the most relevant classes active against Staphylococcus spp...
August 2, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28757008/high-occurrence-of-mecc-mrsa-in-wild-hedgehogs-erinaceus-europaeus-in-sweden
#15
Björn Bengtsson, Lotta Persson, Kerstin Ekström, Helle Ericsson Unnerstad, Henrik Uhlhorn, Stefan Börjesson
We investigated the occurrence of mecC-MRSA in wild hedgehogs (Erinaceus europaeus) in Sweden and characterized the obtained isolates. Samples from 55 hedgehogs from five counties of Sweden were cultivated selectively for MRSA and putative isolates were confirmed by real-time PCR detecting mecA, mecC, nuc and PVL genes. mecC-MRSA was confirmed in 35 (64%) animals from three geographically separated counties. Confirmed isolates were spa-typed and tested for antimicrobial susceptibility by broth microdilution...
August 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28729204/characterisation-of-clinical-isolates-of-oxacillin-susceptible-meca-positive-staphylococcus-aureus-in-china-from-2009-to-2014
#16
Yunjia Song, Lanqing Cui, Yuan Lv, Yun Li, Feng Xue
OBJECTIVES: The aim of this study was to investigate the prevalence and molecular characteristics of clinical oxacillin-susceptible mecA-positive Staphylococcus aureus (OS-MRSA) isolates in China from July 2009 to June 2014. METHODS: A total of 2068 non-duplicate S. aureus isolates were collected from 21 hospitals. Antimicrobial susceptibility testing was performed by the agar dilution method. All OS-MRSA strains were screened for the presence of the genes mecA, mecC and nuc as well as the Panton-Valentine leukocidin gene (pvl)...
December 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28650693/healthy-bovines-as-reservoirs-of-major-pathogenic-lineages-of-staphylococcus-aureus-in-portugal
#17
Teresa Conceição, Hermínia de Lencastre, Marta Aires-de-Sousa
The nosocomial prevalence of methicillin-resistant Staphylococcus aureus (MRSA) in Portugal is close to 50% and remains one of the highest in Europe. MRSA reservoirs in the animal setting in Portugal have been very poorly investigated, namely among animal husbandry. A total of 52 samples (nasal, inguinal region, and milk) were obtained from bovine animals and analyzed for the presence of S. aureus. The isolates were characterized by pulsed-field gel electrophoresis (PFGE), spa typing, SCCmec typing, and multilocus sequence typing and tested for antimicrobial susceptibility, presence of mecA and mecC genes, and virulence determinants...
October 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28549606/variable-performance-of-four-commercial-chromogenic-media-for-detection-of-methicillin-resistant-staphylococcus-aureus-isolates-harbouring-mecc
#18
Céline Dupieux, Camille Kolenda, Anders Rhod Larsen, Bruno Pichon, Mark Holmes, Michèle Bes, Christopher Teale, Elizabeth Dickson, Robert Hill, Robert Skov, Angela Kearns, Frédéric Laurent
In this study, the performances of four methicillin-resistant Staphylococcus aureus (MRSA) chromogenic screening media were compared for detecting mecC-positive MRSA. Using 111 clinical isolates representative of the various mecC-MRSA clones in Europe, chromID(®) MRSA (bioMérieux) and Brilliance(TM) MRSA 2 (Oxoid Ltd.) showed higher sensitivity (99.1% and 97.3%, respectively) than BBL(TM) CHROMagar(®) MRSA II (BD Diagnostics) and MRSASelect(TM) (Bio-Rad) (79.3% and 63.1%, respectively) (P <0.0001). These findings have important implications for effective public health diagnostics and epidemiological surveillance of MRSA...
May 23, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28468636/nationwide-molecular-epidemiology-of-methicillin-resistant-staphylococcus-aureus-responsible-for-horse-infections-in-france
#19
François Guérin, Marguerite Fines-Guyon, Pierrick Meignen, Géraldine Delente, Caroline Fondrinier, Nancy Bourdon, Vincent Cattoir, Albertine Léon
BACKGROUND: The epidemiology of methicillin-resistant Staphylococcus aureus (MRSA) isolated in horse infections is not well documented, especially in France. The aim of the study was to evaluate the prevalence of MRSA isolates in horse infections from 2007 to 2013 in France and to characterize phenotypically and genotypically this collection. RESULTS: Out of 1393 S. aureus horse isolates, 85 (6.1%) were confirmed to be MRSA. Interestingly, the prevalence of MRSA significantly increased from 2007-2009 to 2010-2013 (0...
May 3, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28421046/horses-in-denmark-are-a-reservoir-of-diverse-clones-of-methicillin-resistant-and-susceptible-staphylococcus-aureus
#20
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
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