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https://www.readbyqxmd.com/read/28214222/necessity-to-critically-review-the-automatic-results-of-the-xpert-flu-assay
#1
Ilka Engelmann, Enagnon Kazali Alidjinou, Mouna Lazrek, Anny Dewilde, Didier Hober
While using the Xpert Flu assay we became aware of false-negative results. The study aimed to analyze the causes of these false-negative results. One hundred fifty-nine respiratory specimens were tested in the Xpert Flu assay and in multiplex reverse transcription-polymerase chain reactions (RT-PCRs) for respiratory viruses. Discordant specimens were tested in the Influenza A/B r-gene assay. One hundred fifty-two (96%) and 151 (95%) specimens yielded concordant results for influenza A and B, respectively. Fifteen specimens tested negative in the Xpert Flu assay and positive in a multiplex RT-PCR...
February 2, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28214065/-contribution-of-the-xpert-mtb-rif-to-the-etiological-diagnosis-of-tuberculous-pleurisy
#2
N O Touré, M Wayzani, K Thiam, M F Cissé, F B Mbaye
INTRODUCTION: Performance of the Xpert MTB/RIF for the detection of Mycobacterium tuberculosis in pleural liquid is poorly described. The aim of this study was to determine its usefulness for the etiological diagnosis of a tuberculous pleurisy. PATIENTS AND METHOD: We performed a descriptive cross-sectional study, with analytical design, including all the patients having a unilateral serofibrinous pleurisy, exudative, lymphocytic, and sterile. The diagnosis of pleural tuberculosis was considered based on epidemiological, clinical, paraclinical and therapeutic arguments...
February 14, 2017: Revue des Maladies Respiratoires
https://www.readbyqxmd.com/read/28203378/screening-for-vancomycin-resistant-enterococci-with-xpert%C3%A2-vana-vanb-diagnostic-accuracy-and-impact-on-infection-control-decision-making
#3
B J Holzknecht, D S Hansen, L Nielsen, A Kailow, J O Jarløv
Vancomycin-resistant enterococci (VRE) are increasingly important nosocomial pathogens and screening for colonization status is a mainstay in infection control. We implemented PCR-based screening during vanA-positive Enterococcus faecium outbreaks in four university hospitals in Copenhagen, Denmark. Xpert(®)vanA/vanB was performed directly on rectal swabs and the vanA PCR result was used to guide infection control measures. Concurrently, all samples were selectively cultured including an overnight enrichment step...
March 2017: New Microbes and New Infections
https://www.readbyqxmd.com/read/28199520/implications-of-failure-to-routinely-diagnose-resistance-to-second-line-drugs-in-patients-with-rifampicin-resistant-tuberculosis-on-xpert-mtb-rif-a-multisite-observational-study
#4
Karen R Jacobson, Marinus Barnard, Mary B Kleinman, Elizabeth M Streicher, Elizabeth J Ragan, Laura F White, Ofer Shapira, Tania Dolby, John Simpson, Lesley Scott, Wendy Stevens, Paul D van Helden, Annelies Van Rie, Robin M Warren
No abstract text is available yet for this article.
February 12, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28199375/has-universal-screening-with-xpert%C3%A2-mtb-rif-increased-the-proportion-of-multidrug-resistant-tuberculosis-cases-diagnosed-in-a-routine-operational-setting
#5
Pren Naidoo, Rory Dunbar, Judy Caldwell, Carl Lombard, Nulda Beyers
SETTING: Primary health services in Cape Town, South Africa where the introduction of Xpert® MTB/RIF (Xpert) enabled simultaneous screening for tuberculosis (TB) and drug susceptibility in all presumptive cases. STUDY AIM: To compare the proportion of TB cases with drug susceptibility tests undertaken and multidrug-resistant tuberculosis (MDR-TB) diagnosed pre-treatment and during the course of 1st line treatment in the previous smear/culture and the newly introduced Xpert-based algorithms...
2017: PloS One
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
#6
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/28193240/substitution-of-ethambutol-with-linezolid-during-the-intensive-phase-of-treatment-of-pulmonary-tuberculosis-study-protocol-for-a-prospective-multicenter-randomized-open-label-phase-ii-trial
#7
Ji Yeon Lee, Deog Kyeom Kim, Jung-Kyu Lee, Ho Il Yoon, Ina Jeong, Eunyoung Heo, Young Sik Park, Jae Ho Lee, Sung Soo Park, Sang-Min Lee, Chang-Hoon Lee, Jinwoo Lee, Sun Mi Choi, Jong Sun Park, Joon-Sung Joh, Young-Jae Cho, Yeon Joo Lee, Se Joong Kim, Young Ran Hwang, Hyeonjeong Kim, Jongeun Ki, Hyungsook Choi, Jiyeon Han, Heejung Ahn, Seokyung Hahn, Jae-Joon Yim
BACKGROUND: Linezolid, an oxazolidinone, substantially improves treatment outcomes of multidrug-resistant tuberculosis and extensively drug-resistant tuberculosis. We started a trial to test whether the use of linezolid instead of ethambutol could increase the rate of sputum culture conversion as of 8 weeks of treatment in patients with drug-susceptible tuberculosis. METHODS/DESIGN: This is a phase II, multicenter, randomized study with three arms. We are enrolling patients with pulmonary tuberculosis without rifampicin resistance screened by the Xpert MTB/RIF® assay...
February 13, 2017: Trials
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
#8
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/28182705/low-implementation-of-xpert-mtb-rif-among-hiv-tb-co-infected-adults-in-the-international-epidemiologic-databases-to-evaluate-aids-iedea-program
#9
Kate Clouse, Meridith Blevins, Mary Lou Lindegren, Marcel Yotebieng, Dung Thi Nguyen, Alfred Omondi, Denna Michael, Djimon Marcel Zannou, Gabriela Carriquiry, April Pettit
OBJECTIVE: Xpert MTB/RIF is recommended by the World Health Organization (WHO) as the initial tuberculosis (TB) diagnostic test in individuals suspected of HIV-associated TB. We sought to evaluate field implementation of Xpert among a cohort of HIV/TB co-infected individuals, including availability, utilization and outcomes. DESIGN: Observational cohort study (patient-level data) and cross-sectional study (site-level Xpert availability data). METHODS: Data were collected at 30 participating International epidemiologic Databases to Evaluate AIDS (IeDEA) sites in 18 countries from January 2012-January 2016...
2017: PloS One
https://www.readbyqxmd.com/read/28181032/comprehensive-evaluation-of-chemiluminescent-immunoassays-for-the-laboratory-diagnosis-of-clostridium-difficile-infection
#10
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/28177534/laboratory-diagnosis-of-clostridium-difficile-infection-comparison-of-techlab-c-diff-quik-chek-complete-xpert-c-difficile-and-multistep-algorithmic-approach
#11
Ja Young Seo, Ji Hun Jeong, Kyung Hee Kim, Jeong-Yeal Ahn, Pil-Whan Park, Yiel-Hea Seo
BACKGROUND: Clostridium difficile is a major pathogen responsible for nosocomial infectious diarrhea. We explored optimal laboratory strategies for diagnosis of C. difficile infection (CDI) in our clinical settings, a 1400-bed tertiary care hospital. METHODS: Using 191 fresh stool samples from adult patients, we evaluated the performance of Xpert C. difficile (Xpert CD), C. diff Quik Chek Complete (which simultaneously detects glutamate dehydrogenase [GDH] and C...
February 8, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/28173763/risk-factors-for-poor-multidrug-resistant-tuberculosis-treatment-outcomes-in-kyiv-oblast-ukraine
#12
Omowunmi Aibana, Mariya Bachmaha, Viatcheslav Krasiuk, Natasha Rybak, Timothy P Flanigan, Vasyl Petrenko, Megan B Murray
BACKGROUND: Ukraine is among ten countries with the highest burden of multidrug- resistant TB (MDR-TB) worldwide. Treatment success rates for MDR-TB in Ukraine remain below global success rates as reported by the World Health Organization. Few studies have evaluated predictors of poor MDR-TB outcomes in Ukraine. METHODS: We conducted a retrospective analysis of patients initiated on MDR-TB treatment in the Kyiv Oblast of Ukraine between January 01, 2012 and March 31st, 2015...
February 7, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28172666/clinical-impact-and-cost-effectiveness-of-xpert-mtb-rif-testing-in-hospitalized-patients-with-presumptive-pulmonary-tuberculosis-in-the-united-states
#13
James F Cowan, Aldine S Chandler, Elizabeth Kracen, David R Park, Carolyn K Wallis, Emelline Liu, Chao Song, David H Persing, Ferric C Fang
No abstract text is available yet for this article.
February 15, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28166728/why-being-an-expert-despite-xpert-remains-crucial-for-children-in-high-tb-burden-settings
#14
Jason M Bacha, Katherine Ngo, Petra Clowes, Heather R Draper, Elias N Ntinginya, Andrew DiNardo, Chacha Mangu, Issa Sabi, Bariki Mtafya, Anna M Mandalakas
BACKGROUND: As access to Xpert expands in high TB-burden settings, its performance against clinically diagnosed TB as a reference standard provides important insight as the majority of childhood TB is bacteriologically unconfirmed. We aim to describe the characteristics and outcomes of children with presumptive TB and TB disease, and assess performance of Xpert under programmatic conditions against a clinical diagnosis of TB as a reference standard. METHODS: Retrospective review of children evaluated for presumptive TB in Mbeya, Tanzania...
February 6, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28162099/cost-effectiveness-of-active-case-finding-of-household-contacts-of-pulmonary-tuberculosis-patients-in-a-low-hiv-tuberculosis-endemic-urban-area-of-lima-peru
#15
L Shah, M Rojas, O Mori, C Zamudio, J S Kaufman, L Otero, E Gotuzzo, C Seas, T F Brewer
We compared the cost-effectiveness (CE) of an active case-finding (ACF) programme for household contacts of tuberculosis (TB) cases enrolled in first-line treatment to routine passive case-finding (PCF) within an established national TB programme in Peru. Decision analysis was used to model detection of TB in household contacts through: (1) self-report of symptomatic cases for evaluation (PCF), (2) a provider-initiated ACF programme, (3) addition of an Xpert MTB/RIF diagnostic test for a single sputum sample from household contacts, and (4) all strategies combined...
February 6, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28160728/point-of-care-testing-poct-in-molecular-diagnostics-performance-evaluation-of-genexpert-hcv-rna-test-in-diagnosing-and-monitoring-of-hcv-infection
#16
Ekta Gupta, Pragya Agarwala, Guresh Kumar, Rakhi Maiwall, Shiv Kumar Sarin
BACKGROUND: Molecular testing at the point-of-care may turn out to be game changer for HCV diagnosis and treatment monitoring, through increased sensitivity, reduced turnaround time, and ease of performance. One such assay GeneXpert(®) has recently been released. OBJECTIVES: Comparative analysis between performances of GeneXpert(®) and Abbott HCV-RNA was done. STUDY DESIGN: 174 HCV infected patients were recruited and, one time plasma samples from 154 patients and repeated samples from 20 patients, obtained at specific treatment time-points (0, 4, 12 and 24) weeks were serially re-tested on Xpert(®)...
January 29, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28155817/impact-of-the-genexpert-mtb-rif-technology-on-tuberculosis-control
#17
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/28152082/bringing-state-of-the-art-diagnostics-to-vulnerable-populations-the-use-of-a-mobile-screening-unit-in-active-case-finding-for-tuberculosis-in-palawan-the-philippines
#18
Fukushi Morishita, Anna Marie Celina Gonzales Garfin, Woojin Lew, Kyung Hyun Oh, Rajendra-Prasad Yadav, Janeth Cuencaho Reston, Lenie Lucio Infante, Maria Rebethia Crueldad Acala, Dean Lim Palanca, Hee Jin Kim, Nobuyuki Nishikiori
BACKGROUND: Globally, case detection of tuberculosis (TB) has stabilized in recent years. Active case finding (ACF) has regained an increased attention as a complementary strategy to fill the case detection gap. In the Philippines, the DetecTB project implemented an innovative ACF strategy that offered a one-stop diagnostic service with a mobile unit equipped with enhanced diagnostic tools including chest X-ray (CXR) and Xpert®MTB/RIF (Xpert). The project targeted the rural poor, the urban poor, prison inmates, indigenous population and high school students...
2017: PloS One
https://www.readbyqxmd.com/read/28151842/xpert-mtb-rif-on-stool-is-useful-for-the-rapid-diagnosis-of-tuberculosis-in-young-children-with-severe-pulmonary-disease
#19
Elisabetta Walters, Marieke Magrieta van der Zalm, Megan Palmer, Corné Bosch, Anne-Marie Demers, Heather Draper, Pierre Goussard, Hendrik Simon Schaaf, Sven Olaf Friedrich, Andrew Whitelaw, Robin Warren, Robert P Gie, Anneke C Hesseling
BACKGROUND: Tuberculosis (TB) continues to result in high morbidity and mortality in children from resource-limited settings. Diagnostic challenges, including resource-intense sputum collection methods and insensitive diagnostic tests, contribute to diagnostic delay and poor outcomes in children. We evaluated the diagnostic utility of stool Xpert MTB/RIF (Xpert) compared with bacteriologic confirmation (combination of Xpert and culture of respiratory samples). METHODS: In a hospital-based study in Cape Town, South Africa, we enrolled children younger than 13 years of age with suspected pulmonary TB from April 2012- August 2015...
January 31, 2017: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/28134005/chlamydia-trachomatis-neisseria-gonorrhoeae-and-trichomonas-vaginalis-screening-and-treatment-of-pregnant-women-in-port-au-prince-haiti
#20
Claire C Bristow, Patricia Mathelier, Oksana Ocheretina, Daphne Benoit, Jean W Pape, Adriane Wynn, Jeffrey D Klausner
In Haiti, routine screening for Chlamydia trachomatis (CT), Neisseria gonorrhoeae (NG), and Trichomonas vaginalis (TV) among pregnant women is not conducted; yet these sexually transmitted infections (STIs) are associated with adverse birth and newborn health outcomes. We aimed to assess the acceptability and feasibility of screening and the prevalence of STIs among pregnant women in Port-au-Prince, Haiti. Pregnant women of at least 18 years of age who attend Haitian Study Group for Kaposi's sarcoma and Opportunistic Infections (GHESKIO) clinics in Port-au-Prince, Haiti provided self-collected vaginal swab specimens...
January 1, 2017: International Journal of STD & AIDS
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