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https://www.readbyqxmd.com/read/28283520/biogeography-of-a-novel-clade-of-ensifer-meliloti-associated-with-the-australian-legume-trigonella-suavissima
#1
Bertrand Eardly, Patrick Elia, John Brockwell, Daniel Golemboski, Peter van Berkum
Here we describe a novel clade within Ensifer meliloti and consider how geographic and ecological isolation contributed to the limited distribution of this group. Members of the genus Ensifer are best known for their ability to form nitrogen-fixing symbioses with forage legumes of three related genera, Medicago L., Melilotus Mill., and Trigonella L., which are members of the tribe Trifoleae. They have a natural distribution extending from the Mediterranean basin through west Asia, where there is an unsurpassed number of species belonging to these genera...
March 10, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28267783/fecal-carriage-of-extended-spectrum-%C3%AE-lactamase-producing-escherichia-coli-and-klebsiella-pneumoniae-after-urinary-tract-infection-a-three-year-prospective-cohort-study
#2
Silje B Jørgensen, Arne Søraas, Arnfinn Sundsfjord, Knut Liestøl, Truls M Leegaard, Pål A Jenum
We have performed a prospective cohort study to investigate the duration of and risk factors for prolonged fecal carriage of ESBL-producing Escherichia coli or Klebsiella pneumoniae in patients with community acquired urinary tract infection caused by these bacteria. From 2009 to 2011, 101 Norwegian patients were recruited. Stool swabs and questionnaires were collected every three months for one year and at the end of the study in 2012. Information on antibiotic prescriptions was collected from the Norwegian Prescription Database...
2017: PloS One
https://www.readbyqxmd.com/read/28264559/a-family-of-single-copy-repabc-type-shuttle-vectors-stably-maintained-in-the-alpha-proteobacterium-sinorhizobium-meliloti
#3
Johannes Döhlemann, Marcel Wagner, Carina Happel, Martina Carrillo, Patrick Sobetzko, Tobias J Erb, Martin Thanbichler, Anke Becker
A considerable share of bacterial species maintains segmented genomes. Plant symbiotic α-proteobacterial rhizobia contain up to six repABC-type replicons in addition to the primary chromosome. These low or unit-copy replicons, classified as secondary chromosomes, chromids, or megaplasmids, are exclusively found in α-proteobacteria. Replication and faithful partitioning of these replicons to the daughter cells is mediated by the repABC region. The importance of α-rhizobial symbiotic nitrogen fixation for sustainable agriculture and Agrobacterium-mediated plant transformation as a tool in plant sciences has increasingly moved biological engineering of these organisms into focus...
March 20, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28131671/comparison-of-two-rapid-biochemical-tests-and-four-chromogenic-selective-media-for-detection-of-carbapenemase-producing-gram-negative-bacteria
#4
Vladimira Hinić, Ivo Amrein, Sabrina Stammler, Judith Heckendorn, Dominik Meinel, Reno Frei, Adrian Egli
We evaluated RAPIDEC® CARBA NP, Neo-Rapid CARB, chromID® CARBA SMART (CARB/OXA), Brilliance™ CRE/ESBL, ChromArt CRE and BBL™ CHROMagar™ CPE for the detection of carbapenemase-producing bacteria. The analytical sensitivity of RAPIDEC® CARBA NP was better than that of Neo-Rapid CARB. A combination of carbapenemase and ESBL screening plates could be advantageous.
January 25, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28119780/prevalence-and-molecular-epidemiology-of-clostridium-difficile-infection-in-thailand
#5
P Putsathit, M Maneerattanaporn, P Piewngam, P Kiratisin, T V Riley
Little is known about Clostridium difficile infection (CDI) in Asia generally, and specifically in Thailand. Given the high prevalence of inappropriate antibiotic usage in this region, CDI is likely to be common. This study investigated the prevalence and molecular epidemiology of CDI in Thailand. Stool specimens collected from inpatients with diarrhoea at Siriraj hospital in Bangkok (n = 422) were cultured on ChromID Cdiff agar and any presumptive C. difficile colonies were identified, PCR ribotyped and toxin profiled...
January 2017: New Microbes and New Infections
https://www.readbyqxmd.com/read/28108388/c-%C3%A2-difficile-pcr-ribotype-023-might-go-undetected-when-using-chromid-c-%C3%A2-difficile-agar
#6
E Reigadas, L Alcalá, M Marín, A Martín, E Bouza
We compared the performance of the new chromogenic medium ChromID C. difficile with that of CLO agar. ChromID C. difficile agar is a sensitive medium that can accelerate the presumptive identification of C. difficile, however ribotype 023 might go undetected when using this chromogenic medium.
January 17, 2017: Anaerobe
https://www.readbyqxmd.com/read/28073895/evaluation-of-genotypic-and-phenotypic-methods-to-detect-carbapenemase-production-in-gram-negative-bacilli
#7
Allison R McMullen, Melanie L Yarbrough, Meghan A Wallace, Angela Shupe, Carey-Ann D Burnham
BACKGROUND: Carbapenemase-producing gram-negative bacteria (CP-GNB) are an urgent and expanding public health threat. Rapid and accurate identification of these organisms facilitates infection prevention efforts in healthcare facilities. The objective of our study was to evaluate methods to detect and identify CP-GNB. METHODS: We examined 189 carbapenem-resistant GNB(CR-GNB), including Enterobacteriaceae, Pseudomonas aeruginosa, and Acinetobacter baumannii complex, using 3 different methods: 2 methods to screen isolates of GNB for carbapenemase production [the carbapenem inactivation method (CIM) and 2 chromogenic agars] and a molecular method (Cepheid GeneXpert Carba-R) to identify the mechanism of carbapenem resistance and the associated resistance genes (blaKPC, blaNDM, blaIMP, blaOXA-48-like, and blaVIM)...
March 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28056800/networking-in-microbes-conjugative-elements-and-plasmids-in-the-genus-alteromonas
#8
Mario López-Pérez, Nieves Ramon-Marco, Francisco Rodriguez-Valera
BACKGROUND: To develop evolutionary models for the free living bacterium Alteromonas the genome sequences of isolates of the genus have been extensively analyzed. However, the main genetic exchange drivers in these microbes, conjugative elements (CEs), have not been considered in detail thus far. In this work, CEs have been searched in several complete Alteromonas genomes and their sequence studied to understand their role in the evolution of this genus. Six genomes are reported here for the first time...
January 5, 2017: BMC Genomics
https://www.readbyqxmd.com/read/27936054/high-prevalence-of-faecal-carriage-of-esbl-producing-enterobacteriaceae-among-children-in-dar-es-salaam-tanzania
#9
Marit G Tellevik, Bjørn Blomberg, Øyvind Kommedal, Samuel Y Maselle, Nina Langeland, Sabrina J Moyo
BACKGROUND: Faecal carriage of ESBL-producing bacteria is a potential risk for transmission and infection. Little is known about faecal carriage of antibiotic resistance in Tanzania. This study aimed to investigate the prevalence of faecal carriage of ESBL-producing Enterobacteriaceae and to identify risk factors for carriage among young children in Tanzania. METHODOLOGY/PRINCIPAL FINDINGS: From August 2010 to July 2011, children below 2 years of age were recruited in Dar es Salaam, including healthy community children (n = 250) and children hospitalized due to diarrhoea (n = 250) or other diseases (n = 103)...
2016: PloS One
https://www.readbyqxmd.com/read/27760718/laboratory-detection-of-intestinal-carriage-of-carbapenemase-producing-enterobacteriaceae-a-comparison-of-algorithms-using-the-carba-np-test
#10
COMPARATIVE STUDY
James Knox, Claire Gregory, Louise Prendergast, Chandrika Perera, Jennifer Robson, Lynette Waring
Stool specimens spiked with a panel of 46 carbapenemase-producing Enterobacteriaceae (CPE) and 59 non-carbapenemase producers were used to compare the diagnostic accuracy of 4 testing algorithms for the detection of intestinal carriage of CPE: (1) culture on Brilliance ESBL agar followed by the Carba NP test; (2) Brilliance ESBL followed by the Carba NP test, plus chromID OXA-48 agar with no Carba NP test; (3) chromID CARBA agar followed by the Carba NP test; (4) chromID CARBA followed by the Carba NP test, plus chromID OXA-48 with no Carba NP test...
January 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/27625418/evaluation-of-the-performance-of-c-diff-quik-chek-complete-and-its-usefulness-in-a-hospital-setting-with-a-high-prevalence-of-clostridium-difficile-infection
#11
Hae-Sun Chung, Miae Lee
Rapid and accurate diagnosis of Clostridium difficile infection (CDI) is crucial for patient care, infection control, and efficient surveillance. We evaluated C. DIFF QUIK CHEK COMPLETE (QCC; TechLab), which detects glutamate dehydrogenase (GDH) antigen (QCC-Ag) and toxin A/B (QCC-Tox) simultaneously, and compared it to the laboratory diagnostics for CDI currently in use in a tertiary hospital setting with a high prevalence of CDI. QCC, RIDASCREEN C. difficile toxin A/B assay (Toxin EIA; R-Biopharm AG), chromID C...
January 2017: Journal of Investigative Medicine: the Official Publication of the American Federation for Clinical Research
https://www.readbyqxmd.com/read/27582518/culture-of-urine-specimens-by-use-of-chromid-cps-elite-medium-can-expedite-escherichia-coli-identification-and-reduce-hands-on-time-in-the-clinical-laboratory
#12
Melanie L Yarbrough, Meghan A Wallace, Cynthia Marshall, Erin Mathias, C A Burnham
Urine is one of the most common specimen types submitted to the clinical microbiology laboratory; the use of chromogenic agar is one method by which the laboratory might expedite culture results and reduce hands-on time and materials required for urine culture analysis. The objective of our study was to compare chromID CPS Elite (bioMérieux), a chromogenic medium, to conventional primary culture medium for evaluation of urine specimens. Remnant urine specimens (n = 200) were inoculated into conventional media and into chromID CPS Elite agar (chromID)...
November 2016: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/27562853/chromogenic-media-for-mrsa-diagnostics
#13
REVIEW
Zhenbo Xu, Yuchao Hou, Brian M Peters, Dingqiang Chen, Bing Li, Lin Li, Mark E Shirtliff
For the past decade, a number of chromogenic media for methicillin-resistance Staphylococcus aureus (MRSA) detection have been developed and applied, including Oxoid Brilliance™ MRSA, CHROMagar™ MRSA, BBL™ CHROMagar™ MRSA, MRSASelect and chromID MRSA. The advantages of these chromogenic media offers direct detection of visible staphylococcal colonies, coupled with the use of chromogenic enzymatic substrates that can be hydrolyzed by S. aureus to confirm species or strain identification. BBL™ CHROMagar™ MRSA and MRSASelect are designed for detection of nasal colonization by MRSA, while CHROMagar™ MRSA, Oxoid Brilliance™ MRSA and chromID MRSA are readily applied in bacterial screening...
November 2016: Molecular Biology Reports
https://www.readbyqxmd.com/read/27556286/performance-of-the-artus-c-difficile-qs-rgq-kit-for-the-detection-of-toxigenic-clostridium-difficile
#14
Hee-Won Moon, Hyeong Nyeon Kim, Ji-Young Kim, Mina Hur, Heejung Kim, Yeo-Min Yun
OBJECTIVES: Nucleic acid amplification tests are commonly used for the direct detection of toxigenic Clostridium difficile. We evaluated the diagnostic performance of newly launched, artus C. difficile QS-RGQ Kit (artus C. difficile, QIAGEN, Hilden, Germany), in comparison with toxigenic culture (TC) and Xpert C. difficile (Cepheid, Sunnyvale, CA, USA). DESIGN AND METHODS: In prospectively collected 261 diarrheal specimens, the artus C. difficile and the Xpert C...
January 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/27534258/performance-of-the-chromid-salmonella-elite-chromogenic-agar-in-comparison-with-chromagar%C3%A2-salmonella-oxoid%C3%A2-brilliance%C3%A2-salmonella-and-hektoen-agars-for-the-isolation-of-salmonella-from-stool-specimens
#15
COMPARATIVE STUDY
Delphine Martiny, Anne Dediste, Claire Anglade, Linda Vlaes, Catherine Moens, Souad Mohamed, Olivier Vandenberg
chromID™ Salmonella Elite is compared with 3 culture media commonly used for Salmonella isolation from stool specimens. As results were equivalent to other chromogenic media (100% sensitivity, 98% specificity), only financial arguments should guide the choice for a medium with respect to another.
October 2016: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/27462305/polyclonal-intestinal-colonization-with-extended-spectrum-cephalosporin-resistant-enterobacteriaceae-upon-traveling-to-india
#16
João Pires, Esther Kuenzli, Sara Kasraian, Regula Tinguely, Hansjakob Furrer, Markus Hilty, Christoph Hatz, Andrea Endimiani
We aimed to assess the intestinal colonization dynamics by multiple extended-spectrum cephalosporin-resistant Enterobacteriaceae (ESC-R-Ent) clones in Swiss travelers to India, a country with high prevalence of these multidrug-resistant pathogens. Fifteen healthy volunteers (HVs) colonized with ESC-R-Ent after traveling to India who provided stools before, after, and at 3- and 6-month follow-up are presented in this study. Stools were enriched in a LB broth containing 3 mg/L cefuroxime and plated in standard selective media (BLSE, ChromID ESBL, Supercarba) to detect carbapenem- and/or ESC-R-Ent...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27367648/pitfalls-in-the-identification-of-enterococcus-species-and-the-detection-of-vana-and-vanb-genes
#17
M Papadimitriou-Olivgeris, S Filippidou, F Kolonitsiou, E Drougka, K Koutsileou, F Fligou, V Dodou, S Sarrou, M Marangos, A Vantarakis, E D Anastassiou, E Petinaki, I Spiliopoulou
UNLABELLED: The aims were to assess the performance of Vitek 2 in identifying enterococcal species and the implementation of GeneXpert(®) vanA/vanB PCR for the detection of vancomycin-resistant enterococci (VRE). Gram-positive cocci from clinical and environmental specimens (n = 431) suspicious of being enterococci by conventional methods were evaluated by Vitek 2. This system identified 296 Enterococcus faecium, 87 Enterococcus faecalis, 10 Enterococcus villorum, 9 Enterococcus gallinarum, 9 Enterococcus durans, 5 Enterococcus casseliflavus, 1 Enterococcus spp...
September 2016: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/27344557/strategies-for-recovering-of-planktonic-and-sessile-cells-of-escherichia-coli-o157-h7-from-freshwater-environment
#18
Patricia L Marucci, María A Cubitto
The experiments were performed with Escherichia coli O157:H7 EDL 933 in freshwater microcosms at 12 °C. At 35, 45, and 70 days, samples were taken and filtered through 0.45 μm membrane filters. The following alternatives were tested to evaluate the recovery percentage of injured cells: (1) selective media CHROMagar(™)O157 and chromID(™)O157:H7 agar, at 37 °C for 24 h; (2) tryptic soy agar supplemented with yeast extract (TSAE), incubated at 25 °C for 2 or 4 h, then transferred to CHROMagar(™)O157 or chromID(™)O157:H7 agar at 37 °C (TSAE2h-CHROM, TSAE4h-CHROM and TSAE2h-ID, TSAE4h-ID); (3) thin agar layer (TAL) method, TSAE was overlaid on CHROMagar(™)O157 or chromID(™)O157:H7 agar (TALCHROM and TALID, respectively) and incubated at 37 °C for 24 h; and (4) TALCHROM at 25 °C for 4 h, then continued up to complete 24 h at 37 °C (TALCHROM4h)...
July 2016: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27323765/comparison-of-enzyme-immunoassays-and-rapid-diagnostic-tests-for-clostridium-difficile-glutamate-dehydrogenase-and-toxin-a%C3%A2-%C3%A2-b-to-toxinogenic-culture-on-a-highly-selective-chromogenic-medium
#19
COMPARATIVE STUDY
A Olling, H Leidinger, R Hoffmann
To compare Clostridium. (C.) difficile toxin A/B and glutamate dehydrogenase (GDH) enzyme immunoassays or rapid diagnostic tests to toxinogenic culture on recently described highly selective agar plates. Five hundred consecutive samples sent in for C. difficile diagnostics were tested by toxin A/B enzyme immunoassay (EIA) and rapid diagnostic test (RDT), GDH EIA and RDT, and culture on chromID C. difficile plates for 48 hrs, with toxin testing from culture if the toxin EIA from feces was negative. Samples with discordant results from EIA and RDT were submitted to C...
October 2016: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/27312688/comparison-of-two-chromogenic-media-for-the-detection-of-vancomycin-resistant-enterococcal-carriage-by-nursing-home-residents
#20
COMPARATIVE STUDY
Theodore Gouliouris, Beth Blane, Hayley J Brodrick, Kathy E Raven, Kirsty E Ambridge, Angela D Kidney, Nazreen F Hadjirin, M Estée Török, Direk Limmathurotsakul, Sharon J Peacock
We compared ChromID VRE and Brilliance VRE media for the detection of vancomycin-resistant enterococci (VRE). Using a panel of 28 enterococcal isolates, 10 vanA Enterococcus faecium and three vanA Enterococcus faecalis isolates grew as per manufacturers' instructions whilst growth of two vanC and eight vancomycin-susceptible enterococci was inhibited on both media. Important differences were noted in the selectivity and chromogenic properties of the two media for vanA Enterococcus raffinosus and vanB E. faecium...
August 2016: Diagnostic Microbiology and Infectious Disease
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