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https://www.readbyqxmd.com/read/29769281/a-comparison-of-the-xpert-flu-rsv-xc-and-xpress-flu-rsv-assays
#1
Elena B Popowitch, Melissa B Miller
Molecular diagnostics for influenza and respiratory syncytial virus (RSV) have become commonplace and a variety of tests and systems have been FDA-cleared for use in the United States. We performed a retrospective study to compare the Cepheid Xpress Flu/RSV assay to the Xpert Flu/RSV XC assay, using laboratory-developed tests (LDTs) as the reference method. The Xpress assay was 100% accurate as compared to the LDTs, while the Xpert Flu/RSV XC was 96.0% accurate. The Xpress test was determined to be faster and more sensitive than the XC...
May 16, 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29743311/misidentification-of-s-aureus-by-the-cepheid-xpert%C3%A2-mrsa-sa-bc-assay-due-to-deletions-in-the-spa-gene
#2
Gar-Hing Lee, Stanley Pang, Geoffrey W Coombs
Staphylococcus aureus is a pathogenic bacterium with the capacity to cause a variety of clinical syndromes.….
May 9, 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29668140/-standardization-of-a-multiplex-real-time-pcr-test-for-the-identification-of-angiostrongylus-cantonensis-a-costaricensis-and-a-vasorum
#3
Rubén E Varela-M, Jinney Stefany Arias, Luz Elena Velásquez
INTRODUCTION: Angiostrongyliasis is a disease caused by Angiostrongylus nematodes that is present worldwide. The infections with the highest impact on human and animal health are caused by A. cantonensis, A. costaricensis, and A. vasorum. Clinical forms of the disease in humans are eosinophilic meningitis and abdominal angiostrongyliasis, while the most common effect on dogs are cardiopulmonary damages. It is deemed as an emerging disease as the result of the global dissemination of the African snail Lissachatina fulica, an intermediary host of these parasites...
March 15, 2018: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/29580367/comparison-of-the-cepheid-xpert-hpv-test-and-the-hc2-high-risk-hpv-dna-test-for-detection-of-high-risk-hpv-infection-in-cervical-smear-samples-in-surepath-preservative-fluid
#4
Ali A Rabaan, Shatha A Alfaraj, Mohammed A Alkhalifah
PURPOSE: Cytological and histological cervical screening methods for human papillomavirus may be subjective. Current guidelines recommend the use of direct human papillomavirus screening by molecular methods in conjunction with cytology for the detection of high-risk human papillomavirus types with carcinogenic potential. In this study, we compared the performance of the molecular Cepheid Xpert HPV test to the FDA-approved HC2 High-Risk HPV DNA Test on samples from patients presenting for cervical screening, regardless of the cytology results, in which cervical cell samples were originally collected for Papanicolaou (Pap) smear specimens in Becton Dickinson (BD) SurePath preservative fluid...
March 26, 2018: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/29534914/evaluation-of-the-cepheid-%C3%A2-xpert-%C3%A2-c-difficile-binary-toxin-bt-diagnostic-assay
#5
Alan M McGovern, Grace O Androga, Peter Moono, Deirdre A Collins, Niki F Foster, Barbara J Chang, Thomas V Riley
Strains of Clostridium difficile producing only binary toxin (CDT) are found commonly in animals but not humans. However, human diagnostic tests rarely look for CDT. The Cepheid Xpert C. difficile BT assay detects CDT with equal sensitivity (≥92%) in human and animal faecal samples.
March 11, 2018: Anaerobe
https://www.readbyqxmd.com/read/29499042/multidisease-testing-for-hiv-and-tb-using-the-genexpert-platform-a-feasibility-study-in-rural-zimbabwe
#6
Zibusiso Ndlovu, Emmanuel Fajardo, Elton Mbofana, Tatenda Maparo, Daniela Garone, Carol Metcalf, Helen Bygrave, Kekeletso Kao, Sekesai Zinyowera
BACKGROUND: HIV Viral Load and Early Infant Diagnosis technologies in many high burden settings are restricted to centralized laboratory testing, leading to long result turnaround times and patient attrition. GeneXpert (Cepheid, CA, USA) is a polyvalent near point-of-care platform and is widely implemented for Xpert MTB/RIF diagnosis. This study sought to evaluate the operational feasibility of integrated HIV VL, EID and MTB/RIF testing in new GeneXpert platforms. METHODS: Whole blood samples were collected from consenting patients due for routine HIV VL testing and DBS samples from infants due for EID testing, at three rural health facilities in Zimbabwe...
2018: PloS One
https://www.readbyqxmd.com/read/29444723/evaluation-of-the-xpert-mtb-rif-performance-on-tissues-potential-impact-on-airborne-infection-isolation-at-a-tertiary-cancer-care-center
#7
Tracy McMillen, Shauna C Usiak, Liang Hua Chen, Luz Gomez, Peter Ntiamoah, Meera R Hameed, Indre Budvytiene, Niaz Banaei, Mini Kamboj, N Esther Babady
OBJECTIVES In this study, we sought to evaluate the performance of the Xpert MTB/RIF (Cepheid) assay for the detection of Mycobacterium tuberculosis (MTB) complex DNA on fresh and formalin-fixed, paraffin-embedded (FFPE) tissue specimens from oncology patients in an area with a low prevalence of tuberculosis. We also aimed to retrospectively assess the potential impact of Xpert MTB/RIF on the duration of airborne infection isolation (AII). SETTING A 473-bed, tertiary-care cancer center in New York City. DESIGN A total of 203 tissue samples (101 FFPE and 102 fresh) were tested using Xpert MTB/RIF, including 133 pulmonary tissue samples (65...
April 2018: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/29386266/performance-of-the-xpert-hiv-1-viral-load-assay-a-systematic-review-and-meta-analysis
#8
Madlen Nash, Sophie Huddart, Sayema Badar, Shrikala Baliga, Kavitha Saravu, Madhukar Pai
Viral load (VL) is the preferred treatment-monitoring approach for HIV-positive patients. However, more rapid, near-patient, and low-complexity assays are needed to scale up VL testing. The Xpert HIV-1 VL assay (Cepheid, Sunnyvale, CA) is a new, automated molecular test, and it can leverage the GeneXpert systems that are being used widely for tuberculosis diagnosis. We systematically reviewed the evidence on the performance of this new tool in comparison to established reference standards. A total of 12 articles (13 studies) in which HIV patient VLs were compared between Xpert HIV VL assay and a reference standard VL assay were identified...
April 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29340299/prospective-study-of-the-feasibility-of-point-of-care-testing-strategy-for-carbapenem-resistant-organism-detection
#9
Rahul Pannala, Bruce Baldwin, Vijay Aluru, Thomas E Grys, Jordan Holmes, Laurence J Miller, M Edwyn Harrison, Cuong C Nguyen, Fred C Tenover, David Persing, Douglas O Faigel
Background/aims:  In an investigator-initiated, prospective study, we evaluated the feasibility of a five-gene sequence point-of-care (POC) testing strategy (Xpert CARBA-R Assay, Cepheid Inc., Sunnyvale, CA, USA), compared to reference laboratory PCR (48 - 72 hours turnaround time, two gene sequences), in patients undergoing endoscopic retrograde cholangiopancreatography (ERCP) and in a hospital outbreak investigation. Methods:  After informed consent, patients undergoing ERCP (September 2015 - April 2016, n = 191) at Mayo Clinic and potential hospital contacts (n = 9) of an index carbapenem-resistant organism (CRO)-positive inpatient were included...
January 2018: Endoscopy International Open
https://www.readbyqxmd.com/read/29329754/comparison-of-cepheid%C3%A2-xpert-flu-and-roche-realtime-ready-influenza-a-h1n1-detection-set-for-detection-of-influenza-a-h1n1
#10
Ali A Rabaan, Ali M Bazzi, Sana A Alshaikh
OBJECTIVE: To compare two influenza polymerase chain reaction (PCR) methods. METHODS: A total of 749 suspected MERS-CoV patients presenting at Johns Hopkins Aramco Healthcare, Saudi Arabia, each submitted a clinical sample for influenza A reflex testing using the on-site Cepheid® Xpert Flu assay and at the Ministry of Health laboratory by the Roche PCR assay. RESULTS: There was 92.12% overall agreement between the two methods. Specificity of the Cepheid® Xpert Flu was 95...
April 2018: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/29240781/comparing-mail-in-self-collected-specimens-sent-via-united-states-postal-service-versus-clinic-collected-specimens-for-the-detection-of-chlamydia-trachomatis-and-neisseria-gonorrhoeae-in-extra-genital-sites
#11
COMPARATIVE STUDY
Katheryn R Salow, Adam C Cohen, Claire C Bristow, Mark R McGrath, Jeffrey D Klausner
OBJECTIVES: To evaluate the concordance between clinic-collected extra-genital specimens and self-collected mailed-in extra-genital specimens among participants seeking sexually transmitted infection testing at a free clinic in Hollywood, CA. METHODS: A convenience sample of 210 men who have sex with men were enrolled between February 29, 2016 and December 21, 2016 and received mail-in testing kits for Chlamydia trachomatis (CT) and Neisseria gonorrhoeae (NG). All testing was performed using the GeneXpert® CT/NG (Cepheid, Sunnyvale, CA)...
2017: PloS One
https://www.readbyqxmd.com/read/29174733/comparison-of-the-cepheid-genexpert-ct-ng-assay-to-the-hologic-aptima-combo2-assay-for-the-detection-of-chlamydia-trachomatis-and-neisseria-gonorrhoeae-in-self-collected-rectal-swabs
#12
COMPARATIVE STUDY
Laura Dize, Barbara Silver, Charlotte Gaydos
Self-collected rectal-swabs were tested for CT and NG on GeneXpert CT/NG as compared to APTIMA Combo2. Of 448 rectal-swabs, 22 were positive for CT; 7 for NG on both assays; two were discordant. Sensitivity and specificity of GeneXpert was 95.5% and 99.7% for chlamydia, respectively; for gonorrhea both were 100%.
February 2018: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/29167292/clinical-evaluation-of-the-cepheid-xpert-tv-assay-for-detection-of-trichomonas-vaginalis-with-prospectively-collected-specimens-from-men-and-women
#13
Jane R Schwebke, C A Gaydos, T Davis, J Marrazzo, D Furgerson, S N Taylor, B Smith, L H Bachmann, R Ackerman, T Spurrell, D Ferris, C A Burnham, H Reno, J Lebed, D Eisenberg, P Kerndt, S Philip, J Jordan, N Quigley
Trichomoniasis is the most prevalent curable sexually transmitted disease (STD). It has been associated with preterm birth and the acquisition and transmission of HIV. Recently, nucleic acid amplification tests (NAAT) have been FDA cleared in the United States for detection of Trichomonas vaginalis in specimens from both women and men. This study reports the results of a multicenter study recently conducted using the Xpert TV ( T. vaginalis ) assay to test specimens from both men and women. On-demand results were available in as little as 40 min for positive specimens...
February 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29142048/accurate-pcr-detection-of-influenza-a-b-and-respiratory-syncytial-viruses-by-use-of-cepheid-xpert-flu-rsv-xpress-assay-in-point-of-care-settings-comparison-to-prodesse-proflu
#14
Daniel M Cohen, Jennifer Kline, Larissa S May, Glenn Eric Harnett, Jane Gibson, Stephen Y Liang, Zubaid Rafique, Carina A Rodriguez, Kevin M McGann, Charlotte A Gaydos, Donna Mayne, David Phillips, Jason Cohen
The Xpert Flu+RSV Xpress Assay is a fast, automated in vitro diagnostic test for qualitative detection and differentiation of influenza A and B viruses and respiratory syncytial virus (RSV) performed on the Cepheid GeneXpert Xpress System. The objective of this study was to establish performance characteristics of the Xpert Flu+RSV Xpress Assay compared to those of the Prodesse ProFlu+ real-time reverse transcription-PCR (RT-PCR) assay (ProFlu+) for the detection of influenza A and B viruses as well as RSV in a Clinical Laboratory Improvement Amendments (CLIA)-waived (CW) setting...
February 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29133554/what-is-resistance-impact-of-phenotypic-versus-molecular-drug-resistance-testing-on-therapy-for-multi-and-extensively-drug-resistant-tuberculosis
#15
Jan Heyckendorf, Sönke Andres, Claudio U Köser, Ioana D Olaru, Thomas Schön, Erik Sturegård, Patrick Beckert, Viola Schleusener, Thomas A Kohl, Doris Hillemann, Danesh Moradigaravand, Julian Parkhill, Sharon J Peacock, Stefan Niemann, Christoph Lange, Matthias Merker
Rapid and accurate drug susceptibility testing (DST) is essential for the treatment of multi- and extensively drug-resistant tuberculosis (M/XDR-TB). We compared the utility of genotypic DST assays with phenotypic DST (pDST) using Bactec 960 MGIT or Löwenstein-Jensen to construct M/XDR-TB treatment regimens for a cohort of 25 consecutive M/XDR-TB patients and 15 possible anti-TB drugs. Genotypic DST results from Cepheid GeneXpert MTB/RIF (Xpert) and line probe assays (LPAs; Hain GenoType MTBDR plus 2.0 and MTBDR sl 2...
February 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29091135/an-evaluation-of-false-positive-rifampicin-resistance-on-the-xpert-mtb-rif
#16
Yeliz Tanriverdi Cayci, Kemal Bilgin, Ahmet Yilmaz Coban, Asuman Birinci, Belma Durupınar
BACKGROUND: Mycobacterium tuberculosis (MTB) is one of the most significant causes of mortality and morbidity. Early diagnose is important especially in multiple drug resistant tuberculosis to avoid transmission. Traditional techniques requires at least one to three weeks for diagnosis of tuberculosis. Diagnostic delays with multiple drug resistant tuberculosis are associated with worse clinical outcomes and increased transmission The Xpert MTB/RIF assay is one of the new diagnostic device for the diagnosis of tuberculosis and rapid detection of rifampicin resistance...
November 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/29082442/intrapartum-group-b-streptococcus-screening-in-the-labor-ward-by-xpert%C3%A2-gbs-real-time-pcr
#17
C Plainvert, F El Alaoui, A Tazi, C Joubrel, O Anselem, M Ballon, A Frigo, C Branger, L Mandelbrot, F Goffinet, C Poyart
Group B Streptococcus (GBS) is the leading cause of neonatal infections in industrialized countries. Intrapartum antibiotic prophylaxis (IAP) given to colonized parturients is a key step for the prevention of neonatal early-onset infection. We compared the performances of Xpert® GBS polymerase chain reaction (PCR) (Cepheid, Sunnyvale, CA, USA) as a point-of-care system in labor wards to standard culture for intrapartum GBS detection. Pregnant women with a GBS-positive antenatal screening were prospectively included...
February 2018: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/29074186/xpert-human-papillomavirus-test-is-a-promising-cervical-cancer-screening-test-for-hiv-seropositive-women
#18
COMPARATIVE STUDY
Zizipho Z A Mbulawa, Timothy J Wilkin, Bridgette Goeieman, Avril Swarts, Sophie Williams, Simon Levin, Mark Faesen, Jennifer S Smith, Carla J Chibwesha, Anna-Lise Williamson, Cynthia Firnhaber
This study investigated the performance of Cepheid Xpert human papillomavirus (HPV) assay in South African human immunodeficiency virus (HIV)-infected women and compared its performance with that of hybrid capture-2 (hc2). METHODS: Stored cervical specimens from HIV-infected women that had previously been tested using hc2 were tested using Xpert. RESULTS: The overall HR-HPV prevalence was found to be 62.0% (720/1161) by Xpert and 61.2% (711/1161) by hc2. 13.6% (158/1161) were HPV16 positive, 18...
December 2016: Papillomavirus Research
https://www.readbyqxmd.com/read/29074030/reliable-rapid-assay-for-gonorrhea-and-chlamydia-in-the-emergency-department
#19
Sean P Wilson, Taher Vohra, Jared Goldberg, Christopher Price, Sean Calo, Meredith Mahan, Joseph Miller
BACKGROUND: Chlamydia trachomatis (CT) and Neisseria gonorrhoeae (NG) are common sexually transmitted infections seen in the emergency department (ED). Due to an inability to reliably make accurate diagnosis by physical examination, concern for unreliable follow-up, and current delays in diagnostic nucleic acid amplification testing (NAAT), presumptive treatment active against CT and NG, as described by Centers for Disease Control clinical practice guidelines, is often performed. OBJECTIVES: The purpose of this study was to determine whether a rapid, urine NAAT performed in the ED is noninferior in its diagnostic sensitivity compared with a traditional, swab NAAT assay...
December 2017: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29073731/performance-evaluation-of-cepheid-xpert-norovirus-kit-with-a-user-modified-protocol
#20
Rachel Shi-Lei Wong, Fion Yeo, Wai Theng Chia, Chun Kiat Lee, Mun Han Leong, Christopher Wai-Siong Ng, Kok Siong Poon, Gabriel Zherong Yan, Lily-Lily Chiu, Benedict Junrong Yan, Roland Jureen, Evelyn Siew-Chuan Koay, Hong Kai Lee
The Cepheid Xpert® Norovirus kit automates sample processing, nucleic acid extraction, and real-time reverse transcription polymerase chain reactions (RT-PCRs) to detect norovirus genogroups I (GI) and II (GII). Eighty-five stool samples collected between February 2015 and May 2017 were used to compare the performance of a user-modified Xpert assay against a clinically validated laboratory-developed test (LDT). Of the 85 samples, 54 were previously archived in -80°C freezer. The remaining 31 were fresh samples tested concurrently with the LDT...
March 2018: Journal of Medical Virology
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