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https://www.readbyqxmd.com/read/29224732/handheld-isothermal-amplification-and-electrochemical-detection-of-dna-in-resource-limited-settings
#1
Maria-Nefeli Tsaloglou, Alex Nemiroski, Gulden Camci-Unal, Dionysios C Christodouleas, Lara P Murray, John T Connelly, George M Whitesides
This paper demonstrates a new method for electrochemical detection of specific sequences of DNA present in trace amounts in serum or blood. This method is designed for use at the point-of-care (particularly in resource-limited settings). By combining recombinase polymerase amplification (RPA)- an isothermal alternative to the polymerase chain reaction - with an electroactive mediator, this electrochemical methodology enables accurate detection of DNA in the field using a low-cost, portable electrochemical analyzer (specifically designed for this type of analysis)...
December 7, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/29219122/towards-the-use-of-breath-for-detecting-mycobacterial-infection-a-case-study-in-a-murine-model
#2
Flavio Antonio Franchina, Theodore Robert Mellors, Minara Aliyeva, Jeffrey Wagner, Nirav Daphtary, Lennart Lundblad, Sarah M Fortune, Eric J Rubin, Jane E Hill
In the present research, the potential of breath analysis by comprehensive two-dimensional gas chromatography coupled to mass spectrometry (GC×GC-MS) was investigated for the discrimination between healthy and infected mice. A pilot study employing a total of 16 animals was used to develop a method for breath analysis in a murine model for studying MTBC (Mycobacterium tuberculosis complex) using the M. bovis BCG (Bacillus Calmette-Guérin). Breath was collected in Tedlar bags and concentrated onto thermal desorption tubes for the subsequent analysis by GC×GC-MS...
December 8, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/29218743/repeatability-of-pleural-adenosine-deaminase-measurements-in-diagnostic-evaluation-of-pleural-effusions
#3
Ourania S Kotsiou, Panagiota Tzortzi, Rafailia A A Beta, Athanasios Kyritsis, Konstantinos I Gourgoulianis
BACKGROUND: A follow-up thoracentesis is proposed in suspected atypical tuberculosis cases. The study aimed to define the variability of pleural ADA values across repeated thoracenteses in different types of pleural effusions (PEs) and to evaluate whether ADA variance, in regard to the cutoff value of 40 U/L, affected final diagnosis. METHODS: A total of 131 patients with PEs of various etiologies underwent three repeated thoracenteses. ADA values were subsequently estimated...
December 7, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/29215188/pcr-test-in-induced-sputum-of-patients-with-pulmonary-tuberculosis
#4
Verônica da Silva Paiva, Fernanda Luiza Staub, Dirceu Felipe Valentini, Regina Bones Barcellos, Karen Barros Schmid, Elis Regina Dalla Costa, Maria Lucia Rosa Rossetti, Paulo de Tarso Roth Dalcin, Denise Rossato Silva
INTRODUCTION: Induced sputum (IS) is an alternative method of obtaining sputum, but IS smears are frequently negative. Culture is more time-consuming in its results, and less useful to guide the diagnosis. Polymerase chain reaction (PCR) is the most common methodology for rapid diagnosis of TB, and few studies evaluated its role in IS samples. OBJECTIVES: The objective of this study is to determine the diagnostic yield of PCR for TB compared with culture in IS samples...
December 7, 2017: Clinical Respiratory Journal
https://www.readbyqxmd.com/read/29214755/comparative-evaluation-of-the-loop-mediated-isothermal-amplification-assay-for-detecting-pulmonary-tuberculosis
#5
Chang Ki Kim, Eun A Cho, Dong Mi Shin, Sung Won Choi, So Youn Shin
BACKGROUND: Early detection of tuberculosis (TB) is challenging in resource-poor settings because of limited accessibility to molecular diagnostics. The aim of this study was to evaluate the performance of the loop-mediated isothermal amplification kit (TB-LAMP) for TB diagnosis compared with conventional and molecular tests. METHODS: A total of 290 consecutive sputum samples were collected from May till September, 2015. All samples were processed using the N-Acetyl-L-cysteine (NALC) NaOH method and tested by smear microscopy, solid and liquid culture, real-time PCR, and TB-LAMP...
March 2018: Annals of Laboratory Medicine
https://www.readbyqxmd.com/read/29211183/survival-of-patients-with-aids-and-co-infection-with-the-tuberculosis-bacillus-in-the-south-and-southeast-regions-of-brazil
#6
Márcio Cristiano de Melo, Maria Rita Donalisio, Ricardo Carlos Cordeiro
The study investigates the survival of patients with co-infection AIDS-TB through a retrospective study of a cohort of individuals aged 13 or more and the diagnosis of AIDS reported in the years 1998-99 and following 10 years. Of the 2,091 AIDS cases, 517 (24.7%) had positive diagnosis for tuberculosis, and 379 (73.3%) were male. The risk among co-infected patients was 1,65 times the not co-infected. Have been compared the exposed and non-exposed through the Kaplan-Meier and Cox method. The variables associated with longer survival were: female gender (HR = 0...
November 2017: Ciência & Saúde Coletiva
https://www.readbyqxmd.com/read/29208880/comparative-yielding-of-bactec-mgit-960-and-genexpert-mtb-rif-assay-for-rapid-diagnosis-of-drug-resistance-tuberculosis-from-sputum-specimen
#7
N Laskar, M A Hossain, S A Nasreen, S M Kamal, S Roy, F Nahar, M Rahman, T K Barman
Among communicable disease, tuberculosis is the second leading cause of death worldwide, killing nearly two million people each year. Several diagnostic techniques are currently used to detect mycobacteria in respiratory specimens. Therefore an alternative, rapid and most effective method is required for diagnosis of pulmonary tuberculosis which is relatively more sensitive and specific. A total of 107 sputum samples of suspected TB patients were enrolled attending the National Tuberculosis Reference Laboratory (NTRL), Mohakhali, Dhaka, Bangladesh from July 2014 to July 2015...
October 2017: Mymensingh Medical Journal: MMJ
https://www.readbyqxmd.com/read/29196714/screening-and-identification-of-lncrnas-as-potential-biomarkers-for-pulmonary-tuberculosis
#8
Zhong-Liang Chen, Li-Liang Wei, Li-Ying Shi, Meng Li, Ting-Ting Jiang, Jing Chen, Chang-Ming Liu, Su Yang, Hui-Hui Tu, Yu-Ting Hu, Lin Gan, Lian-Gen Mao, Chong Wang, Ji-Cheng Li
Pulmonary tuberculosis (TB) is among the diseases with the highest morbidity and mortality worldwide. Effective diagnostic methods for TB are lacking. In this study, we investigated long non-coding RNAs (lncRNAs) in plasma using microarray and the potential diagnostic value of lncRNAs for TB. We found a total of 163 up-regulated lncRNAs and 348 down-regulated lncRNAs. Gene ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG) and coding-noncoding co-expression (CNC) analyses showed that functions of differentially expressed lncRNAs were mainly enriched in the regulation of alpha-beta T cell activation and the T cell receptor signalling pathway...
December 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29196066/cough-due-to-tuberculosis-and-other-chronic-infections-chest-guideline-and-expert-panel-report
#9
Stephen K Field, Patricio Escalante, Dina A Fisher, Belinda Ireland, Richard S Irwin
BACKGROUND: Cough is common in pulmonary tuberculosis (TB) and other chronic respiratory infections. Identifying features that predict whether pulmonary TB is the cause would help target appropriate individuals for rapid and cost-effective screening, potentially limiting disease progression, and preventing transmission to others. METHODS: A systematic literature search for individual studies to answer 8 Key questions (KQ) was conducted according to established Chest Organization methods using the following databases: MEDLINE via PubMed, EMBASE, Scopus and the Cochrane Database of Systematic Reviews from 1/1/1984 to April 2014...
November 28, 2017: Chest
https://www.readbyqxmd.com/read/29187929/-role-of-genexpert-mtb-rif-test-in-the-screening-for-pulmonary-tuberculosis-at-the-general-referral-provincial-hospital-of-bukavu-in-the-east-of-the-democratic-republic-of-the-congo-balance-after-10-months-of-use
#10
David Lupande, David Kaishusha, Carine Mihigo, Moise Itongwa, Gustave Yenga, Philippe Katchunga
Introduction: In sub-Saharan Africa, diagnostic methods for tuberculosis are inadequate and are essentially based on microscopy. They constitute a real obstacle to the control of tuberculosis. This study aimed to evaluate the performance of GeneXpert MTB/RIF test compared to classical Ziehl-Neelsen staining at the the general referral provincial hospital of Bukavu, in the east of the Democratic Republic of the Congo after 10 months of use. Methods: The results of Ziehl-Neelsen staining and GeneXpert MTB/RIF molecular biology test performed in 452 patients with suspected tuberculosis were collected...
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/29183553/childhood-multidrug-resistant-tuberculosis-in-the-european-union-and-european-economic-area-an-analysis-of-tuberculosis-surveillance-data-from-2007-to-2015
#11
Csaba Ködmön, Martin van den Boom, Phillip Zucs, Marieke Johanna van der Werf
BackgroundConfirming tuberculosis (TB) in children and obtaining information on drug susceptibility is essential to ensure adequate treatment. We assessed whether there are gaps in diagnosis and treatment of multidrug-resistant (MDR) TB in children in the European Union and European Economic Area (EU/EEA), quantified the burden of MDR TB in children and characterised cases. Methods: We analysed surveillance data from 2007 to 2015 for paediatric cases younger than 15 years. Results: In that period, 26 EU/EEA countries reported 18,826 paediatric TB cases of whom 4,129 (21...
November 2017: Euro Surveillance: Bulletin Européen sur les Maladies Transmissibles, European Communicable Disease Bulletin
https://www.readbyqxmd.com/read/29182688/interferon-gamma-release-assay-for-the-diagnosis-of-latent-tuberculosis-infection-a-latent-class-analysis
#12
Tan N Doan, Damon P Eisen, Morgan T Rose, Andrew Slack, Grace Stearnes, Emma S McBryde
BACKGROUND: Accurate diagnosis and subsequent treatment of latent tuberculosis infection (LTBI) is essential for TB elimination. However, the absence of a gold standard test for diagnosing LTBI makes assessment of the true prevalence of LTBI and the accuracy of diagnostic tests challenging. Bayesian latent class models can be used to make inferences about disease prevalence and the sensitivity and specificity of diagnostic tests using data on the concordance between tests. We performed the largest meta-analysis to date aiming to evaluate the performance of tuberculin skin test (TST) and interferon-gamma release assays (IGRAs) for LTBI diagnosis in various patient populations using Bayesian latent class modelling...
2017: PloS One
https://www.readbyqxmd.com/read/29153452/diagnostics-of-tuberculosis-and-differentiation-of-nonspecific-tuberculin-reactions-in-animals
#13
Sovetzhan Z Basybekov, Marat B Bazarbayev, Bolat A Yespembetov, Assiya Mussaeva, Serik G Kanatbayev, Kanapya M Romashev, Aigul K Dossanova, Tokseiit A Yelekeyev, Elmira K Akmatova, Nazym S Syrym
Tuberculosis is a serious disease of humans and animals, caused by bacteria of the Mycobacterium genus. This leads to complications in the life of the sick person, and subsequently to death. The cattle, who have been diagnosed with this bacterium, are usually sent to the slaughter, with the result that their livestock is reduced. Mycobacteriosis is also a disease, after determining which cattle are most often sent to slaughter. Such a reduction in livestock numbers has a negative effect on the economy. Of the 300 samples from the animals, 25 cultures of atypical bacteria responding to tuberculin were isolated...
October 25, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/29153061/-defining-of-gene-mutations-and-minimal-inhibitory-concentrations-in-isoniazid-resistant-mycobacterium-tuberculosis-isolates
#14
Esra Yıldırım, Meltem Uzun
Tuberculosis is a very important disease all over the world despite the advanced diagnostic and treatment regimens. Resistant tuberculosis, which has increased in recent years in particular, is a global problem and prevents the fight against tuberculosis. For this reason, it is important to determine the etiologic agent early and its sensitivity against antituberculosis drugs. Resistance profiles of the isolates and the gene mutations causing resistance are determined for epidemiological purposes and mutation regions of the isolates are being investigated on the basis of countries...
October 2017: Mikrobiyoloji Bülteni
https://www.readbyqxmd.com/read/29136358/is-secretion-of-ifn-gamma-in-response-to-mycobacterium-tuberculosis-antigens-in-youngest-children-sufficient-to-play-a-role-in-tb-diagnostics
#15
Teresa Bielecka, Anna Komorowska-Piotrowska, Katarzyna Krenke, Wojciech Feleszko, Marek Kulus
OBJECTIVES: To assess whether children ≤5 years of age, produce sufficient amounts of interferon gamma (IFN-ɣ) in response to phytohaemagglutinin (mitogen), and Mycobacterium tuberculosis antigens (TB antigens) in the QuantiFERON-TB Gold in-Tube test (QFT-GIT), (Cellestis Ltd., Australia). WORKING HYPOTHESIS: Is TB-antigen-induced IFN-ɣ response in children ≤5 years sufficient to consider QFT-GIT a possible tool for TB diagnostics? Study design, patient-subject selection, and methods: We recruited children 0-17 years old suspected of TB infection to this cross-sectional study, in whom QFT-GIT and TST were performed...
November 14, 2017: Pediatric Pulmonology
https://www.readbyqxmd.com/read/29116218/improvement-in-clinical-outcome-and-infection-control-using-molecular-diagnostic-techniques-for-early-detection-of-mdr-tuberculous-spondylitis-a-multicenter-retrospective-study
#16
Wenjie Wu, Jingtong Lyu, Peng Cheng, Yuan Cheng, Zehua Zhang, Litao Li, Yonghong Zheng, Jianzhong Xu
There has been limited research on the therapeutic efficacy of molecular diagnosis of spinal tuberculosis. We attempted to determine whether the utilization of molecular diagnosis to detect multidrug-resistant spinal tuberculosis can improve clinical outcomes. A multicenter retrospective study was conducted from February 2009 to June 2015. Ninety-two consecutive culture-confirmed multidrug-resistant tuberculosis (MDR-TB) patients with spinal tuberculosis who were diagnosed clinically and by imaging were enrolled in the study...
November 8, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/29109010/a-novel-isothermal-amplification-based-method-to-detect-mycobacterium-tuberculosis-complex
#17
Dongxin Liu, Bing Zhao, Xichao Ou, Huiwen Zheng, Aijing Ma, Wencong He, Shengfen Wang, Yang Zhou, Hui Xia, Yang Zheng, Ping Hou, Guangxue He, Yanlin Zhao
Mycobacterium tuberculosis (MTB) is the causative agent of pulmonary tuberculosis. Rapid and accurate diagnosis is crucial to tuberculosis control and prevention. A series of diagnostic methods has been available for MTB detection; however, new rapid, simple and affordable methods are needed. In this study, a multiple cross displacement amplification (MCDA)-based assay was developed to detect the IS6110 gene of the M. tuberculosis complex. Hydroxy naphthol blue (HNB), a colorimetric indicator, was used to detect amplification products...
November 3, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/29108749/sensitivity-and-specificity-of-quantiferon-tb-gold-plus-compared-with-quantiferon-tb-gold-in-tube-and-t-spot-tb-on-active-tuberculosis-in-japan
#18
Jin Takasaki, Toshie Manabe, Eriko Morino, Yoshikazu Muto, Masao Hashimoto, Motoyasu Iikura, Shinyu Izumi, Haruhito Sugiyama, Koichiro Kudo
BACKGROUND: The QuantiFERON-TB Gold Plus (QFT-Plus) was introduced in 2015 as a new generation of interferon-gamma release assays (IGRAs) designed to detect Mycobacterium tuberculosis infection (TB). Examination of its diagnostic accuracy is crucial before it is launched in Japan. METHOD: We examined 99 patients with laboratory-confirmed active TB (patients) and 117 healthy volunteers with no risk of TB infection (controls) at a medical center in Tokyo, Japan. Blood samples were collected from both the patients and controls and tested using three types of IGRAs: the QFT-Plus, the QuantiFERON-TB Gold In-Tube (QFT-GIT), and the T-SPOT...
November 3, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/29104936/tuberculosis-state-is-associated-with-expression-of-toll-like-receptor-2-in-sputum-macrophages
#19
Karim Lakehal, David Levine, Kathleen F Kerr, Pooja Vir, Natalie Bruiners, Alfred Lardizabal, Maria Laura Gennaro, Richard Pine
During tuberculosis, macrophages are critical for both pathogen survival and host immune activation. Since expression of particular cell surface markers reflects cell function, we used flow cytometry to measure the abundance of surface markers associated with polarity, lipid uptake, or pattern recognition on macrophages found in induced sputum. Nine macrophage surface markers were examined from three groups of donors: infection-free, latent tuberculosis infection, and active pulmonary tuberculosis. Using a trend test, we found that expression of Toll-like receptor 2 was greater from absence of infection to latent infection and from latent infection to active tuberculosis...
November 2017: MSphere
https://www.readbyqxmd.com/read/29100256/radiological-diagnoses-in-the-context-of-emigration-infectious-diseases
#20
Marija Stoijkovic, Jan Müller, Thomas Junghanss, Tim Frederik Weber
Background Globalization and emigration impact on the spectrum of diseases challenging health care systems. Medical practitioners have to particularly prepare for infectious diseases. Methods The database of a health care center specialized on tropical medicine was screened for patients with history of migration and one of the following diagnoses: Cystic echinococcosis, tuberculosis, schistosomiasis, visceral leishmaniosis, and neurocysticercosis. Representative casuistics were prepared from select case histories...
November 3, 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
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