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https://www.readbyqxmd.com/read/28321579/performance-of-three-generations-of-xpert-mrsa-in-routine-practice-approaching-the-aim
#1
H Jacqmin, A Schuermans, S Desmet, J Verhaegen, V Saegeman
The aim of this study was to evaluate retrospectively the performance of the Xpert MRSA assay in routine practice and its current use in the intensive care unit (ICU) setting of our hospital, since a pre-emptive isolation strategy has been applied. A total of 6473 patients were routinely screened with ESwab for methicillin-resistant Staphylococcus aureus (MRSA) using three generations of rapid real-time polymerase chain reaction (PCR) (Cepheid GeneXpert) over three consecutive periods of time. Performance was evaluated using broth enrichment culture as the reference method...
March 20, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28318702/antibiotic-associated-diarrhea-clinical-characteristics-and-the-presence-of-clostridium-difficile
#2
A Rodríguez-Varón, O M Muñoz, J Pulido-Arenas, S B Amado, M Tobón-Trujillo
INTRODUCTION AND AIMS: Evidence in Colombia and Latin America has been insufficient for establishing the clinical characteristics of patients with antibiotic-associated diarrhea (AAD). The present study attempts to describe the clinical characteristics of patients with AAD and to determine the presence of Clostridium difficile, utilizing the polymerase chain reaction (PCR) technique. MATERIALS AND METHODS: Forty-three patients with AAD, managed at the Hospital Universitario San Ignacio in Bogota, Colombia, were evaluated...
March 15, 2017: Revista de Gastroenterología de México
https://www.readbyqxmd.com/read/28317812/evaluation-of-pulmonary-tuberculosis-case-detection-improvement-with-the-deployment-of-xpertmtb-rif-in-the-tuberculosis-control-program-of-cross-river-state-nigeria
#3
Ernest Afu Ochang, Ubleni E Emanghe, Atana Ewa, Akaninyene Otu, Jonah B Offor, Micheal Odo, Aniekan Etokidem, Barinadaa Afirima, Oju Eni Owuna, Sunday M Obeten, Martin M Meremikwu
OBJECTIVE/BACKGROUND: Global indices show that Nigeria has the highest tuberculosis (TB)-related mortality rate. Overdependence on Ziehl-Neelsen (ZN) smear microscopy for diagnosis and human immunodeficiency virus (HIV)/AIDS has limited control efforts. The new polymerase chain reaction-based XpertMTB/Rif (Cepheid Inc., CA, USA), which detects Mycobacterium tuberculosis and rifampicin resistance, was introduced in Cross River State in 2014. We evaluated the increment in pulmonary TB case detection following introduction of XpertMTB/Rif into the Cross River State TB control program...
January 2017: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28317811/performance-of-the-xpert-mtb-rif-assay-in-the-diagnosis-of-tuberculosis-in-formalin-fixed-paraffin-embedded-tissues
#4
Pascal Polepole, Mwila Kabwe, Mpanga Kasonde, John Tembo, Aaron Shibemba, Justin O'Grady, Nathan Kapata, Alimuddin Zumla, Matthew Bates
OBJECTIVE/BACKGROUND: Extrapulmonary tuberculosis (EPTB), which accounts for 10%-40% of the global burden of TB, with the highest incidence in Sub-Saharan Africa, is strongly associated with human immunodeficiency virus infection. Diagnosing EPTB is challenging, and recently, there has been a concerted effort to evaluate the latest molecular diagnostics for diagnosing TB in a range of specimen types. The Xpert MTB/RIF assay (Cepheid, Sunnyvale, CA, USA) is one such technology, which simultaneously detects Mycobacterium tuberculosis and rifampicin resistance...
January 2017: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28285563/impact-of-introduction-of-xpert-flu-assay-for-influenza-pcr-testing-on-obstetric-patients-a-quality-improvement-project
#5
Eimear Linehan, Marian Brennan, Sadhbh O'Rourke, Suzie Coughlan, Lisa Clooney, David LeBlanc, Joanna Griffin, Maeve Eogan, Richard J Drew
OBJECTIVE: The aim of this project was to assess the implementation of a quality improvement project regarding the introduction of on-site influenza PCR testing in a stand-alone obstetric hospital. METHODS: As part of a quality improvement project on the management of influenza in obstetric patients, the Xpert Flu assay (Cepheid, USA) was introduced on-site and it replaced the previous method of PCR testing which was off-site. The main outcome measures were duration of antimicrobials, rate of admission and administration of oseltamavir in the emergency department...
March 12, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28278193/a-bcr-abl1-cutoff-of-1-5-at-3-months-determined-by-the-genexpert-system-predicts-an-optimal-response-in-patients-with-chronic-myeloid-leukemia
#6
Valentín García-Gutiérrez, María T Gómez-Casares, José M Puerta, Juan M Alonso-Domínguez, Santiago Osorio, Juan C Hernández-Boluda, Rosa Collado, María J Ramírez, Fátima Ibáñez, María L Martín, Juan D Rodríguez-Gambarte, Carolina Martínez-Laperche, Montse Gómez, Dolly V Fiallo, Sara Redondo, Alicia Rodríguez, Concepción Ruiz-Nuño, Juan L Steegmann, Antonio Jiménez-Velasco
In chronic myeloid leukemia (CML) patients, 3-month BCR-ABL1 levels have consistently been correlated with further outcomes. Monitoring molecular responses in CML using the GeneXpert (Cepheid) platform has shown an optimal correlation with standardized RQ-PCR (IS) when measuring BCR-ABL1 levels lower than 10%, as it is not accurate for values over 10%. The aim of the present study was to determine the predictive molecular value at three months on different outcome variables using the Xpert BCR-ABL1 MonitorTM assay (Xpert BCR-ABL1)...
2017: PloS One
https://www.readbyqxmd.com/read/28275079/multicentre-evaluation-of-the-cepheid-xpert%C3%A2-hepatitis-c-virus-hcv-viral-load-assay
#7
M P McHugh, A H B Wu, S Chevaliez, J M Pawlotsky, M Hallin, K E Templeton
Viral load monitoring for hepatitis C virus (HCV) is necessary to diagnose infection and monitor response to therapy but the tests involved are currently confined to specialist institutions. There is need for a fast, accurate assay with limited operator input to enhance the access to viral load monitoring. We evaluated the quantification of HCV RNA in serum and plasma by the Cepheid Xpert® HCV Viral Load assay in comparison to the Abbott RealTime HCV assay. Serum and plasma samples from HCV infected individuals at four international sites were gathered...
March 8, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28255603/intraoperative-diagnosis-of-staphylococcus-aureus-and-coagulase-negative-staphylococcus-using-xpert-mrsa-sa-ssti-assay-in-prosthetic-joint-infection
#8
Andrea Sambri, Giovanni Pignatti, Matteo Romagnoli, Davide Donati, Maurilio Marcacci, Matteo Cadossi
The aim of this prospective study was to evaluate the performance of the Polymerase Chain Reaction (PCR) tool Xpert MRSA/SA SSTI test (Cepheid, Sunnyvale, CA, USA) on periprosthetic samples from a cohort of patients with suspected prosthetic joint infection (PJI). Seventy adult patients were included in this prospective study. On the basis of the preoperative evaluation, 39 patients were clinically considered to have a PJI, whereas 31 were presumed to suffer from an aseptic mobilization of the implant. Xpert MRSA/SA SSTI identified 4 out of 4 MRSA, 7 out of 7 MSSA, and 14 out of 16 methicillin resistant CoNS...
March 1, 2017: New Microbiologica
https://www.readbyqxmd.com/read/28238388/multicenter-evaluation-of-the-revised-rida%C3%A2-quick-test-n1402-for-rapid-detection-of-norovirus-in-a-diagnostic-laboratory-setting
#9
Stijn Jonckheere, Nadine Botteldoorn, Patricia Vandecandelaere, Johan Frans, Wim Laffut, Guy Coppens, Anne Vankeerberghen, Hans De Beenhouwer
The updated RIDA® QUICK (N1402) immunochromatographic assay (R-Biopharm) for detection of norovirus was evaluated during a prospective, multicenter study using 771 stool samples from patients with gastroenteritis. Compared to real-time reverse transcriptase polymerase chain reaction (RT-rtPCR) as gold standard, the RIDA® QUICK had an overall sensitivity of 72.8% (91/125) and a specificity of 99.5% (640/643). Genotype analysis of the polymerase (ORF1) and capsid (ORF2) region of the genome indicated that the RIDA® QUICK assay could detect a broad range of genotypes including new variants (15 of 125 positive samples) which were detected by an in-house SYBR®Green RT-rtPCR, but not by the RIDA® GENE PCR PG1415 (R-Biopharm) and mostly not by the RIDA® GENE PCR PG1405 and the Xpert® Norovirus assay (Cepheid)...
February 12, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28237624/three-year-evaluation-of-xpert-mtb-rif-in-a-low-prevalence-tuberculosis-setting-a-scottish-perspective
#10
Benjamin J Parcell, Anna Jarchow-MacDonald, Amie-Louise Seagar, Ian Laurenson, Gordon J Prescott, Michael Lockhart
OBJECTIVES: Xpert MTB/RIF (Cepheid) is a rapid molecular assay shown to be sensitive and specific for pulmonary tuberculosis (TB) diagnosis in highly endemic countries. We evaluated its diagnostic performance in a low TB prevalence setting, examined rifampicin resistance detection and quantitative capabilities predicting graded auramine microscopy and time to positivity (TTP) of culture. METHODS: Xpert MTB/RIF was used to test respiratory samples over a 3 year period...
February 22, 2017: Journal of Infection
https://www.readbyqxmd.com/read/28213975/lab-in-a-tube-real-time-molecular-point-of-care-diagnostics-for-influenza-a-and-b-using-the-cobas%C3%A2-liat%C3%A2-system
#11
Willem Jg Melchers, Judith Kuijpers, Joanna Sickler, Janette Rahamat-Langendoen
BACKGROUND: Rapid diagnosis of influenza A and B is important for direct treatment decisions in patient care and for the reduction of in-hospital transmissions. The new real-time PCR based molecular point-of-care (POC) assay, the cobas(®) Influenza A/B test on the cobas(®) Liat® System (cobas(®) Liat® Influenza A/B assay), generated a PCR result in less than 20 minutes, was evaluated for the detection of influenza A and B. METHOD OF THE STUDY: 121 retrospectively collected respiratory specimens, previously analyzed with a routine influenza A/B test (Diagenode) were tested using the cobas(®) Liat® Influenza A/B assay...
February 18, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28197879/impact-of-xpert-mrsa-sa-blood-culture-pcr-assay-on-management-of-positive-blood-cultures-in-obstetric-patients-a-retrospective-audit
#12
A Page, S O'Rourke, M Brennan, L Clooney, D Le Blanc, J Griffin, M Eogan, R J Drew
BACKGROUND: The Xpert MRSA/SA blood culture assay (Cepheid, USA) is a rapid PCR test which can be used for positive blood cultures where Gram-positive cocci in clusters are seen. It can detect Staphylococcus aureus and also the mecA gene, which encodes for β-lactam resistance. The assay was introduced into the Rotunda Hospital for positive blood cultures to allow earlier detection of MRSA and methicillin susceptible S. aureus. AIM: To assess the impact of the Xpert MRSA/SA blood culture assay on the management of obstetric patients with a positive blood culture where Gram-positive cocci in clusters were seen...
February 14, 2017: Irish Journal of Medical Science
https://www.readbyqxmd.com/read/28185823/variation-in-mrsa-identification-results-from-different-generations-of-xpert-mrsa-real-time-pcr-testing-kits-from-nasal-swabs
#13
Ali A Rabaan, Ali M Bazzi
GeneXpert MRSA kits (Cepheid) are based on a multiplex, real-time PCR method for methicillin-resistant Staphylococcus aureus (MRSA) detection, with primers to detect each SCCmec type and the chromosomal orfX-SCCmec junction. Modifications in recent kit versions were proposed to help overcome false-positive issues in earlier kit versions. The main objective of this study was to determine whether use of any version of the GeneXpert MRSA multiplex, real-time PCR kits yielded higher than expected MRSA+ results...
February 6, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28181032/comprehensive-evaluation-of-chemiluminescent-immunoassays-for-the-laboratory-diagnosis-of-clostridium-difficile-infection
#14
A Makristathis, I Zeller, D Mitteregger, M Kundi, A M Hirschl
For the microbiological diagnosis of a Clostridium (C.) difficile infection (CDI), a two-test algorithm consisting of a C. difficile glutamate dehydrogenase (GDH)-immunoassay followed by a toxin-immunoassay in positive cases is widely used. In this study, two chemiluminescent immunoassays (CLIAs), one for GDH and the other for the toxins A and B, have been evaluated systematically using appropriate reference methods. Three-hundred diarrhoeal stool specimens submitted for CDI diagnosis were analysed by the LIAISON CLIAs (DiaSorin)...
February 8, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28155817/impact-of-the-genexpert-mtb-rif-technology-on-tuberculosis-control
#15
Wendy Susan Stevens, Lesley Scott, Lara Noble, Natasha Gous, Keertan Dheda
Molecular technology revolutionized the diagnosis of tuberculosis (TB) with a paradigm shift to faster, more sensitive, clinically relevant patient care. The most recent molecular leader is the GeneXpert MTB/RIF assay (Xpert) (Cepheid, Sunnyvale, CA), which was endorsed by the World Health Organization with unprecedented speed in December 2010 as the initial diagnostic for detection of HIV-associated TB and for where high rates of drug resistance are suspected. South Africa elected to take an aggressive smear replacement approach to facilitate earlier diagnosis and treatment through the decision to implement the Xpert assay nationally in March 2011, against the backdrop of approximately 6...
January 2017: Microbiology Spectrum
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
#16
COMPARATIVE STUDY
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...
April 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28091937/ocular-mycobacteriosis-dual-infection-of-m-tuberculosis-complex-with-m-fortuitum-and-m-bovis
#17
Kusum Sharma, Natasha Gautam, Megha Sharma, Mohit Dogra, Priya Bajgai, Basavaraj Tigari, Aman Sharma, Vishali Gupta, Surya Prakash Sharma, Ramandeep Singh
BACKGROUND: We report unfavorable outcome in a patient with subretinal granuloma caused by dual infection of Mycobacterium tuberculosis complex with Mycobacterium fortuitum and Mycobacterium bovis in an immunosuppressed, non-HIV patient. We did a systematic review of literature on dual infection due to M. tuberculosis and M. fortuitum via MEDLINE and PUBMED and could not find any case reported of causing this kind of dual infection in the eye. RESULTS: A 38-year-old Indian male patient presented with decreased vision in the left eye for 3 months, diagnosed as tubercular choroidal granuloma with associated retinal angiomatosis proliferans (RAP) lesion...
December 2017: Journal of Ophthalmic Inflammation and Infection
https://www.readbyqxmd.com/read/28087944/laboratory-diagnosis-and-susceptibility-testing-for-mycobacterium-tuberculosis
#18
Gary W Procop
The laboratory, which utilizes some of the most sophisticated and rapidly changing technologies, plays a critical role in the diagnosis of tuberculosis. Some of these tools are being employed in resource-challenged countries for the rapid detection and characterization of Mycobacterium tuberculosis. Foremost, the laboratory defines appropriate specimen criteria for optimal test performance. The direct detection of mycobacteria in the clinical specimen, predominantly done by acid-fast staining, may eventually be replaced by rapid-cycle PCR...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087170/clostridium-difficile-rates-in-asymptomatic-and-symptomatic-hospitalized-patients-using-nucleic-acid-testing
#19
Cynthia Truong, Lee F Schroeder, Rajiv Gaur, Victoria Emma Anikst, Ikuko Komo, Colleen Watters, Erin McCalley, Carole Kulik, David Pickham, Nancy J Lee, Niaz Banaei
BACKGROUND: The Clostridium difficile rate in symptomatic patients represents both those with C. difficile infection (CDI) and those with colonization. To predict the extent of CDI overdiagnosis, we compared the asymptomatic colonization rate to the symptomatic positivity rate in hospitalized patients using nucleic acid testing. METHODS: Between July 2014 and April 2015, formed stool samples were collected from asymptomatic patients after admission to 3 hospital wards at the Stanford Hospital...
April 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28073895/evaluation-of-genotypic-and-phenotypic-methods-to-detect-carbapenemase-production-in-gram-negative-bacilli
#20
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
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