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https://www.readbyqxmd.com/read/29142048/accurate-pcr-detection-of-influenza-a-b-and-rsv-using-the-cepheid-xpert-flu-rsv-xpress-assay-in-point-of-care-settings-comparison-to-prodesse-proflu
#1
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, B, and 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 the Prodesse ProFlu+ real-time RT-PCR assay (ProFlu+) for the detection of influenza A and B as well as RSV in a CLIA-waived (CW) setting. Overall, the assay, using fresh and frozen nasopharyngeal (NP) swabs, demonstrated high concordance with ProFlu+ in the combined CW and non-CW settings with Positive Percent Agreements (PPA) (100%, 100%, 97...
November 15, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29133554/what-is-resistance-impact-of-phenotypic-versus-molecular-drug-resistance-testing-on-multi-and-extensively-drug-resistant-tuberculosis-therapy
#2
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 MTBDRplus 2.0 and MTBDRsl 2...
November 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29091135/an-evaluation-of-false-positive-rifampicin-resistance-on-the-xpert-mtb-rif
#3
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
#4
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...
October 29, 2017: 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
#5
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%C3%A2-the%C3%A2-emergency-department
#6
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...
October 23, 2017: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29073731/performance-evaluation-of-cepheid-xpert-norovirus-kit-with-a-user-modified-protocol
#7
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...
October 26, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/29066627/detection-of-neisseria-gonorrhoeae-and-chlamydia-trachomatis-from-pooled-rectal-pharyngeal-and-urine-specimens-in-men-who-have-sex-with-men
#8
David John Speers, I-Ly Joanna Chua, Justin Manuel, Lewis Marshall
OBJECTIVES: Screening of men who have sex with men (MSM) for Chlamydia trachomatis (CT) and Neisseria gonorrhoeae (NG) requires sampling from anorectal and pharyngeal sites in addition to urogenital sampling. Due to the cost of testing multiple anatomical sites individually testing of pooled specimens has potential merit. The Cepheid GeneXpert CT/NG assay (GeneXpert), which also has potential for point-of-care nucleic acid testing in the sexual health clinic, has not been assessed for pooled specimen testing...
October 24, 2017: Sexually Transmitted Infections
https://www.readbyqxmd.com/read/29061538/development-of-a-90-minute-integrated-non-invasive-urinary-assay-for-bladder-cancer-detection
#9
Ellen Wallace, Russell Higuchi, Malini Satya, Leena McCann, Mandy Ly Sin, Julia A Bridge, Huilin Wei, Jun Zhang, Edith Wong, Andrew Hiar, Kathleen E Mach, Douglas Scherr, R Blair Egerdie, Shoichiro Ohta, Wade J Sexton, Maxwell V Meng, Alon Z Weizer, Michael Woods, G Kenneth Jansz, Joseph Zadra, Yair Lotan, Joseph C Liao
PURPOSE: Despite suboptimal sensitivity, urine cytology is often performed as an adjunct to cystoscopy for bladder cancer diagnosis. We aimed to develop a non-invasive, fast molecular diagnostic test for bladder cancer detection with better sensitivity than urine cytology while maintaining adequate specificity. MATERIALS AND METHODS: Urine specimens were collected at 18 multinational sites from subjects prior to cystoscopy or tumor resection, and from healthy and other control subjects without evidence of bladder cancer...
October 20, 2017: Journal of Urology
https://www.readbyqxmd.com/read/29057945/a-pilot-evaluation-of-whole-blood-finger-prick-sampling-for-point-of-care-hiv-viral-load-measurement-the-unicorn-study
#10
Sarah Fidler, Heather Lewis, Jodi Meyerowitz, Kristin Kuldanek, John Thornhill, David Muir, Alice Bonnissent, Georgina Timson, John Frater
There is a global need for HIV viral load point-of-care (PoC) assays to monitor patients receiving antiretroviral therapy. UNICORN was the first study of an off-label protocol using whole blood finger-prick samples tested with and without a simple three minute spin using a clinic-room microcentrifuge. Two PoC assays were evaluated in 40 HIV-positive participants, 20 with detectable and 20 with undetectable plasma viral load (pVL) (<20 copies/ml). Using 100 µl finger-prick blood samples, the Cepheid Xpert HIV-1 Viral Load and HIV-1 Qual cartridges were compared with laboratory pVL assessment (TaqMan, Roche)...
October 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29053085/rifampicin-resistance-and-multidrug-resistant-tuberculosis-detection-using-xpert-mtb-rif-in-wuhan-china-a-retrospective-study
#11
Hai Huang, Yanlin Zhang, Sheng Li, Jun Wang, Jun Chen, Zhiyun Pan, Hui Gan
BACKGROUND: The Xpert MTB/RIF test (Cepheid, Sunnyvale, CA) can simultaneously detect the Mycobacterium tuberculosis (MTB) complex DNA and rifampicin (RFP) resistance and can rapidly determine RFP resistance and predict multidrug-resistant tuberculosis (MDR-TB). In this study, we analyzed clinical examination results of a hospital specializing in TB treatment in Wuhan, Hubei, China, and examined the use of traditional culture and drug-sensitive test (DST) results as a gold standard to assess the diagnosis value of the Xpert MTB/RIF test in RFP resistance and MDR-TB...
October 20, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/29036487/prospective-and-retrospective-evaluation-of-the-performance-of-the-fda-approved-cepheid-xpert-flu-rsv-xc-assay
#12
Sophie Arbefeville, Elizabeth Thonen-Kerr, Patricia Ferrieri
Rapid and accurate detection of respiratory viruses is important in patient care and in guiding therapy and infection prevention policy. Rapid viral antigen assays are simple to perform and provide results within 15 to 30 minutes but are limited by their modest-to-moderate sensitivity. Molecular assays are more sensitive and specific but require more technical time and expertise and are more expensive. We verified the performance of the Xpert Flu/RSV XC assay prospectively, using patient respiratory samples from the 2014-2015 respiratory season, and, retrospectively, with frozen patient samples from the previous respiratory season...
November 8, 2017: Laboratory Medicine
https://www.readbyqxmd.com/read/28966035/comparison-of-three-molecular-assays-for-detection-of-enteric-viruses-in-stool-samples
#13
Haciba Moudjahed, Claire Pinçon, Kazali Alidjinou, Anny Dewilde, Anne Goffard
Three molecular assays (FTD(®) Viral GE from Fast-track diagnostics, RIDA(®)GENE VSP1 from R-Biopharm, and Xpert Norovirus from Cepheid) were compared for virus detection in acute diarrhea samples. RIDA(®)GENE and FTD(®) Viral GE showed perfect/almost perfect agreement for Rotavirus, Sapovirus and Norovirus, substantial agreement for Adenovirus, and moderate agreement for Astrovirus.
September 29, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28956800/molecular-characterization-of-neisseria-gonorrhoeae-on-non-cultured-specimens-from-multiple-anatomic-sites
#14
Anna Carannante, Valeria Ghisetti, Ivano Dal Conte, Gabriella Gregori, Maria Laura Stella, Paola Vacca, Simonetta Del Re, Paola Stefanelli
INTRODUCTION: The aim of this study was to molecularly characterize Neisseria gonorrhoeae on non-cultured specimens collected from multiple anatomic sites. N. gonorrhoeae multiantigen sequence typing (NG-MAST) together with the gene sequence analysis of antimicrobial resistance (AMR) target genes were used. MATERIALS AND METHODS: Seventeen genital and extra-genital samples from eight patients (7 were men who have sex with men, MSM, and 1 women who have sex with men, WSM) with gonorrhoea symptoms were analyzed...
July 2017: Annali Dell'Istituto Superiore di Sanità
https://www.readbyqxmd.com/read/28954901/evaluation-of-the-cobas%C3%A2-cdiff-test-for-the-detection-of-toxigenic-clostridium-difficile-in-stool-samples
#15
Lance R Peterson, Stephen A Young, Thomas E Davis, Zi-Xuam Wang, John Duncan, Christopher Noutsios, Oliver Liesenfeld, John C Osiecki, Michael A Lewinski
Nucleic acid amplification tests are reliable tools for the detection of toxigenic Clostridium difficile from unformed (liquid or soft) stool samples. The objective of this study was to evaluate performance of the cobas® Cdiff Test on the cobas® 4800 System using prospectively collected stool specimens from patients suspected of C. difficile infection (CDI). Performance of the cobas® Cdiff Test was compared to the combined results of direct and broth enriched toxigenic culture in a large, multicenter clinical trial...
September 27, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28920845/modified-use-of-real-time-pcr-detection-of-group-b-streptococcus-in-pregnancy
#16
Ali A Rabaan, Justin V Saunar, Ali M Bazzi, Joan L Soriano
The CDC recommends antenatal screening of vaginal/rectal samples for Streptococcus agalactiae at 35-37 weeks' gestation, with intra-partum antibiotic prophylaxis for positive cases. We tested a modified use of the Cepheid Xpert GBS real-time PCR kit on enrichment cultures from 554 vaginal/rectal swabs compared to the current subculturing gold standard method. Swabs were inoculated on polymyxin nalidixic acid agar plates, and Todd-Hewitt enrichment broth cultures were examined daily for growth. Todd-Hewitt broth culture was also used for Xpert GBS...
October 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28898982/prevalence-of-anal-human-papillomavirus-hpv-and-performance-of-cepheid-xpert-and-hybrid-capture-2-hc2-hpv-assays-in-south-african-hiv-infected-women
#17
Zizipho Z A Mbulawa, Timothy Wilkin, Bridgette J Goeieman, Eefje Jong, Pamela Michelow, Avril Swarts, Jennifer S Smith, Patricia Kegorilwe, Cynthia S Firnhaber, Anna-Lise Williamson
Objectives: This study investigated anal high-risk HPV (HR-HPV) prevalence in HIV-infected women using the Cepheid Xpert HPV assay and compares its performance with that of Hybrid Capture-2 (hc2). Methods: A total of 199 HIV-infected women were recruited from Helen Joseph Hospital, Johannesburg. Stored ThinPrep anal swabs that had previously been tested using hc2 were tested for HPV using Xpert. Results: The HR-HPV prevalence by Xpert was 40...
August 1, 2017: American Journal of Clinical Pathology
https://www.readbyqxmd.com/read/28892765/the-performance-of-luminex-aries-%C3%A2-flu-a-b-rsv-and-cepheid-xpert-%C3%A2-flu-rsv-xc-for-the-detection-of-influenza-a-influenza-b-and-respiratory-syncytial-virus-in-prospective-patient-samples
#18
Phillip McMullen, Sue Boonlayangoor, Angella Charnot-Katsikas, Kathleen G Beavis, Vera Tesic
BACKGROUND: The demand for rapid, accurate viral testing has increased the number of assays available for the detection of viral pathogens. One of the newest FDA cleared platforms is the Luminex ARIES(®) Flu A/B & RSV, which is a fully automated, real-time PCR-based assay used for detection of influenza A, influenza B, and respiratory syncytial virus (RSV). OBJECTIVES: We sought to compare the performance of Luminex ARIES(®) Flu A/B & RSV assay to the Cepheid Xpert(®) Flu/RSV XC assay for rapid Flu and RSV testing...
September 5, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28855305/field-evaluation-of-performance-of-alere-and-cepheid-qualitative-hiv-assays-for-pediatric-point-of-care-testing-in-an-academic-hospital-in-soweto-south-africa
#19
Tanya Y Murray, Gayle G Sherman, Firdose Nakwa, William B MacLeod, Nosisa Sipambo, Sithembiso Velaphi, Sergio Carmona
Point-of-care (POC) technologies for HIV diagnosis in infants have the potential to overcome logistical challenges that delay treatment initiation and prevent improvements in morbidity and mortality. This study aimed to evaluate the performance of two POC technologies against the current standard-of-care (SOC) laboratory-based assay in South Africa, when operated by nurses in a hospital environment. Children <18 months of age who were treatment naive (excluding prophylaxis) and in whom an HIV PCR test was indicated were eligible for the study...
November 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28799824/high-prevalence-of-asymptomatic-sexually-transmitted-infections-among-human-immunodeficiency-virus-infected-pregnant-women-in-a-low-income-south-african-community
#20
Maanda Mudau, Remco P Peters, Lindsey De Vos, Dawie H Olivier, Dvora J Davey, Edwin S Mkwanazi, James A McIntyre, Jeffrey D Klausner, Andrew Medina-Marino
There is a lack of evidence on the burden of Chlamydia trachomatis (CT), Neisseria gonorrhoeae (NG) and Trichomonas vaginalis (TV) among HIV-infected pregnant women in South Africa. We conducted a cross-sectional analysis of HIV-infected pregnant women in two healthcare facilities in a South African township to determine the prevalence of CT, NG and TV. HIV-infected pregnant women were recruited during the first antenatal care visit for their current pregnancy and requested to self-collect vulvovaginal swab specimens...
January 1, 2017: International Journal of STD & AIDS
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