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Rif xpert for tuberculosis

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https://www.readbyqxmd.com/read/28317811/performance-of-the-xpert-mtb-rif-assay-in-the-diagnosis-of-tuberculosis-in-formalin-fixed-paraffin-embedded-tissues
#1
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/28317800/are-who-approved-nucleic-acid-amplification-tests-causing-large-scale-false-identification-of-rifampicin-resistant-tuberculosis-programmatic-experience-from-south-india
#2
Praveen Sanker, Anusree P Ambika, Vishnu T Santhosh, Ramya Puthukkudi Kottuthodi, Ravikrishnan Balakrishnan, Sunil Kumar Mrithunjayan, Hisham Moosan
INTRODUCTION: The nucleic acid amplification tests (NAATs): Line probe assay and GeneXpert (Xpert) have evolved as the primary tool for identification of rifampicin (RIF)-resistant (RR) tuberculosis (TB) worldwide, primarily because of the ease and speed. We rechecked RR isolates identified by NAATs from presumptive RR TB cases belonging to South India by the Revised National TB Control Program, India using multiple RIF concentrations on Bactec MGIT system and compared the mutation patterns with the resistance levels...
January 2017: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28284253/effect-of-previous-treatment-and-sputum-quality-on-diagnostic-accuracy-of-xpert-%C3%A2-mtb-rif
#3
C Acuña-Villaorduña, P Orikiriza, D Nyehangane, L F White, J Mwanga-Amumpaire, S Kim, M Bonnet, K P Fennelly, Y Boum, E C Jones-López
SETTING: In early studies, Xpert® MTB/RIF accurately detected culture-proven pulmonary tuberculosis (TB). Recent reports have, however, found a lower than expected specificity in previously treated TB patients. OBJECTIVE: To investigate the diagnostic accuracy of Xpert in presumptive pulmonary TB patients in Southwestern Uganda. DESIGN: We obtained demographic and clinical information and collected three sputum samples from each patient for smear microscopy, Xpert and culture...
April 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28284252/operational-modelling-the-mechanisms-influencing-tb-diagnostic-yield-in-an-xpert-%C3%A2-mtb-rif-based-algorithm
#4
R Dunbar, P Naidoo, N Beyers, I Langley
SETTING: Cape Town, South Africa. OBJECTIVE: To compare the diagnostic yield for smear/culture and Xpert® MTB/RIF algorithms and to investigate the mechanisms influencing tuberculosis (TB) yield. METHOD: We developed and validated an operational model of the TB diagnostic process, first with the smear/culture algorithm and then with the Xpert algorithm. We modelled scenarios by varying TB prevalence, adherence to diagnostic algorithms and human immunodeficiency virus (HIV) status...
April 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28284251/bottom-up-or-top-down-unit-cost-estimation-of-tuberculosis-diagnostic-tests-in-india
#5
S Rupert, A Vassall, N Raizada, S D Khaparde, C Boehme, V S Salhotra, K S Sachdeva, S A Nair, A H Van't Hoog
SETTING: Of 18 sites that participated in an implementation study of the Xpert® MTB/RIF assay in India, we selected five microscopy centres and two reference laboratories. OBJECTIVE: To obtain unit costs of diagnostic tests for tuberculosis (TB) and drug-resistant TB. DESIGN: Laboratories were purposely selected to capture regional variations and different laboratory types. Both bottom-up and the top-down methods were used to estimate unit costs...
April 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28281441/miliary-tuberculosis
#6
Surendra K Sharma, Alladi Mohan
Miliary tuberculosis (TB) results from a massive lymphohematogenous dissemination of Mycobacterium tuberculosis bacilli and is characterized by tiny tubercles evident on gross pathology resembling millet seeds in size and appearance. The global HIV/AIDS pandemic and widespread use of immunosuppressive drugs and biologicals have altered the epidemiology of miliary TB. Considered to be predominantly a disease of infants and children in the pre-antibiotic era, miliary TB is increasingly being encountered in adults as well...
March 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28275073/rapid-detection-of-cell-free-mycobacterium-tuberculosis-dna-in-tuberculous-pleural-effusion
#7
Nanying Che, Xinting Yang, Zichen Liu, Kun Li, Xiaoyou Chen
Tuberculous pleurisy is one of the most common extra-pulmonary tuberculosis, but its diagnosis remains to be difficult. In this study, we for the first time report detection of cell-free Mycobacterium tuberculosis DNA in pleural effusion and evaluation of this newly developed molecular assay. A total of 78 patients with pleural effusion, 60 patients with tuberculous pleurisy and 18 patients with alternative diseases, were included in this study. Mycobacterial culture, Xpert MTB/RIF assay, adenosine deaminase assay, T-SPOT...
March 8, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28249999/utility-of-second-generation-line-probe-assay-hain-mtbdrplus-directly-on-2-month-sputa-specimens-to-monitor-tuberculosis-treatment-response
#8
Neesha Rockwood, Justyna Wojno, Yonas Ghebrekristos, Mark P Nicol, Graeme Meintjes, Robert J Wilkinson
The utility of line probe assay (Genotype MTBDRplus) performed directly on 2-month sputa to monitor tuberculosis treatment response is unknown. We assessed if direct testing of 2-month sputa with MTBDRplus can predict 2-month culture conversion and long-term treatment outcome. Xpert® MTB/RIF-confirmed rifampicin-susceptible tuberculosis cases were recruited at tuberculosis diagnosis and followed up at 2 and 5-6 months. MTBDRplus was performed directly on 2-month sputa and on all positive culture isolates at 2 and 5-6 months...
March 1, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28237624/three-year-evaluation-of-xpert-mtb-rif-in-a-low-prevalence-tuberculosis-setting-a-scottish-perspective
#9
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/28229100/diagnosis-of-tuberculosis-following-world-health-organization-recommended-criteria-in-severely-malnourished-children-presenting-with-pneumonia
#10
Mohammod Jobayer Chisti, Mohammed Abdus Salam, Abu S M S B Shahid, K M Shahunja, Sumon Kumar Das, Abu Syed Golam Faruque, Pradip Kumar Bardhan, Tahmeed Ahmed
Evidences on diagnosis of tuberculosis (TB) following the World Health Organization (WHO) criteria in children with severe acute malnutrition (SAM) are lacking. We sought to evaluate the WHO criteria for the diagnosis of TB in such children. In this prospective study, we enrolled SAM children aged <5 with radiological pneumonia. We collected induced sputum and gastric lavage for smear microscopy, mycobacterial culture, and Xpert MTB/RIF. Using the last 2 methods as the gold standard, we determined sensitivity, specificity, and positive and negative predictive values of WHO criteria (n = 388)...
2017: Global Pediatric Health
https://www.readbyqxmd.com/read/28225345/results-of-xpert-%C3%A2-mtb-rif-implementation-in-kyrgyzstan
#11
G Kurbaniyazova, M Joncevska, S Kalon, G Kalmambetova, T Mohr, A Toktogonova, K Takieva, K M Monirul Islam, F Luelmo
INTRODUCTION: In July 2012, the United States Agency for International Development (USAID) Quality Health Care Project introduced the Xpert® MTB/RIF assay at the facility level of the primary health care system in Kyrgyzstan. This study analysed the results of the implementation of Xpert. MATERIALS AND METHODS: Test results from 2734 patients from July 2012 to December 2014 were analysed. The sensitivity and specificity of Xpert in routine programme conditions were evaluated using culture and phenotypic drug susceptibility testing (DST) as gold standard...
March 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28222095/delays-and-loss-to-follow-up-before-treatment-of-drug-resistant-tuberculosis-following-implementation-of-xpert-mtb-rif-in-south-africa-a-retrospective-cohort-study
#12
Helen Cox, Lindy Dickson-Hall, Norbert Ndjeka, Anja Van't Hoog, Alison Grant, Frank Cobelens, Wendy Stevens, Mark Nicol
BACKGROUND: South Africa has a large burden of rifampicin-resistant tuberculosis (RR-TB), with 18,734 patients diagnosed in 2014. The number of diagnosed patients has increased substantially with the introduction of the Xpert MTB/RIF test, used for tuberculosis (TB) diagnosis for all patients with presumptive TB. Routine aggregate data suggest a large treatment gap (pre-treatment loss to follow-up) between the numbers of patients with laboratory-confirmed RR-TB and those reported to have started second-line treatment...
February 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28214065/-contribution-of-the-xpert-mtb-rif-to-the-etiological-diagnosis-of-tuberculous-pleurisy
#13
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/28199375/has-universal-screening-with-xpert%C3%A2-mtb-rif-increased-the-proportion-of-multidrug-resistant-tuberculosis-cases-diagnosed-in-a-routine-operational-setting
#14
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/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
#15
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/28182705/low-implementation-of-xpert-mtb-rif-among-hiv-tb-co-infected-adults-in-the-international-epidemiologic-databases-to-evaluate-aids-iedea-program
#16
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/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
#17
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/28155817/impact-of-the-genexpert-mtb-rif-technology-on-tuberculosis-control
#18
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
#19
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
#20
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
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