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https://www.readbyqxmd.com/read/28337993/evaluation-of-5-novel-protein-biomarkers-for-the-rapid-diagnosis-of-pulmonary-and-extra-pulmonary-tuberculosis-preliminary-results
#1
Amit Singh, Anil Kumar Gupta, Krishnamoorthy Gopinath, Pawan Sharma, Sarman Singh
Improved methods are required for the early and accurate diagnosis of tuberculosis, especially in the patients with smear-negative disease. Several biomarkers have been tried but most have shown poor sensitivity or specificity. In present study we aimed to evaluate the diagnostic utility of five novel antigens identified earlier by us. This is an initial study conducted on 250 subjects. The five recombinant antigens, named as rSS1 (Rv2145c), rSS2 (Rv0164), rSS3 (Rv1437), rSS4 (Rv1827) and rSS5 (Rv2970c), were expressed in pQE-30 expression vector, purified and their sero-diagnostic efficacy was evaluated in an unblinded manner using dot-blot and ELISA methods...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28337966/acid-fast-positive-and-acid-fast-negative-mycobacterium-tuberculosis-the-koch-paradox
#2
Catherine Vilchèze, Laurent Kremer
Acid-fast (AF) staining, also known as Ziehl-Neelsen stain microscopic detection, developed over a century ago, is even today the most widely used diagnostic method for tuberculosis. Herein we present a short historical review of the evolution of AF staining methods and discuss Koch's paradox, in which non-AF tubercle bacilli can be detected in tuberculosis patients or in experimentally infected animals. The conversion of Mycobacterium tuberculosis from an actively growing, AF-positive form to a nonreplicating, AF-negative form during the course of infection is now well documented...
March 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28337426/pathogen-identification-in-suspected-cases-of-pyogenic-spondylodiscitis
#3
Ahmad Farajzadeh Sheikh, Azar D Khosravi, Hamed Goodarzi, Roohangiz Nashibi, Alireaza Teimouri, Azim Motamedfar, Reza Ranjbar, Sara Afzalzadeh, Mehrandokht Cyrus, Mohammad Hashemzadeh
Pyogenic spinal infection continues to represent a worldwide problem. In approximately one-third of patients with pyogenic spondylodiscitis, the infectious agent is never identified. Of the cases that lead to organismal identification, bacteria are more commonly isolated from the spine rather than fungi and parasites. This study applied universal prokaryotic 16S rRNA PCR as a rapid diagnostic tool for the detection of bacterial agents in specimens from patients suspected of pyogenic spondylodiscitis. Gram and Ziehl-Neelsen staining were used as a preliminary screening measure for microbiologic evaluation of patient samples...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28334030/measuring-mortality-due-to-hiv-associated-tuberculosis-among-adults-in-south-africa-comparing-verbal-autopsy-minimally-invasive-autopsy-and-research-data
#4
Aaron S Karat, Mpho Tlali, Katherine L Fielding, Salome Charalambous, Violet N Chihota, Gavin J Churchyard, Yasmeen Hanifa, Suzanne Johnson, Kerrigan McCarthy, Neil A Martinson, Tanvier Omar, Kathleen Kahn, Daniel Chandramohan, Alison D Grant
BACKGROUND: The World Health Organization (WHO) aims to reduce tuberculosis (TB) deaths by 95% by 2035; tracking progress requires accurate measurement of TB mortality. International Classification of Diseases (ICD) codes do not differentiate between HIV-associated TB and HIV more generally. Verbal autopsy (VA) is used to estimate cause of death (CoD) patterns but has mostly been validated against a suboptimal gold standard for HIV and TB. This study, conducted among HIV-positive adults, aimed to estimate the accuracy of VA in ascertaining TB and HIV CoD when compared to a reference standard derived from a variety of clinical sources including, in some, minimally-invasive autopsy (MIA)...
2017: PloS One
https://www.readbyqxmd.com/read/28323150/systematic-expression-profiling-analysis-mines-dys-regulated-modules-in-active-tuberculosis-based-on-re-weighted-protein-protein-interaction-network-and-attract-algorithm
#5
Ying Sun, Yan Weng, Ying Zhang, Xiang Yan, Lei Guo, Jia Wang, Xin Song, Ying Yuan, Fu-Ye Chang, Chun-Ling Wang
About 90% of tuberculosis (TB) patients latently infected with Mycobacterium tuberculosis (Mtb) show no symptoms, yet have a 10% chance in lifetime to progress active TB. Nevertheless, current diagnosis approaches need improvement in efficiency and sensitivity. The objective of this work was to detect potential signatures for active TB to further improve the understanding of the biological roles of functional modules involved in this disease. First, targeted networks of active TB and control groups were established via re-weighting protein-protein interaction (PPI) networks using Pearson's correlation coefficient (PCC)...
March 18, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28320401/prevalence-of-tuberculous-lesion-in-cattle-slaughtered-in-mubende-district-uganda
#6
Daniel Pakasi Nalapa, Adrian Muwonge, Clovice Kankya, Francisco Olea-Popelka
BACKGROUND: The aim of this study was to estimate the prevalence of gross pathology suggestive of bovine tuberculosis (TB-like lesions) and evaluate animal's characteristics associated with the risk of having bovine TB-like lesions among cattle slaughtered in Mubende district in the Uganda cattle corridor. METHOD: We conducted a cross sectional study in which 1,576 slaughtered cattle in Mubende district municipal abattoir underwent post-mortem inspection between August 2013 and January 2014...
March 21, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28317400/nanodiagnostics-for-tuberculosis-detection
#7
Hesham El-Samadony, Asma Althani, Mohamed Awad Tageldin, Hassan M E Azzazy
Introduction Tuberculosis (TB) is a leading killer worldwide. End TB strategy aims at ending the TB epidemic by 2030. Early, accurate, and affordable diagnosis represents a cornerstone to achieve this goal. Innovative strategies for TB diagnostics have been introduced, however the ideal assay is yet unavailable and conventional methods remain necessary for diagnosis. Unique properties of nanoparticles (NPs) have allowed their utilization in TB detection via targeting disease biomarkers. Area Covered Until now, around thirty-five TB NP-based assays have been partially or fully characterized...
March 20, 2017: Expert Review of Molecular Diagnostics
https://www.readbyqxmd.com/read/28303781/delays-in-diagnosis-and-treatment-of-pulmonary-tuberculosis-in-afb-smear-negative-patients-with-pneumonia
#8
Z X Zhang, L-H Sng, Y Yong, L M Lin, T W Cheng, N H Seong, F K Yong
<h2>BACKGROUND:</h2><p>Diagnostic and treatment delays increase the severity and transmission of pulmonary tuberculosis (PTB). This study aimed to evaluate TB diagnostic and treatment delays in acid-fast bacilli (AFB) smear-negative patients.</p><h2>METHODS:</h2><p>This was a retrospective observational study. Patients with positive AFB culture of <i>Mycobacterium tuberculosis</i> complex (MTC) were selected from among hospitalised patients with a diagnosis of pneumonia...
March 16, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28288691/immunological-diagnosis-as-an-adjunctive-tool-for-an-early-diagnosis-of-tuberculous-meningitis-of-an-immune-competent-child-in-a-low-tuberculosis-endemic-country-a-case-report
#9
Serena Vita, Camilla Ajassa, Emanuela Caraffa, Miriam Lichtner, Claudia Mascia, Fabio Mengoni, Maria Grazia Paglia, Cristina Mancarella, Davide Colistra, Claudio Di Biasi, Rosa Maria Ciardi, Claudio Maria Mastroianni, Vincenzo Vullo
BACKGROUND: Pediatric tuberculous meningitis is a highly morbid, often fatal disease. Its prompt diagnosis and treatment saves lives, in fact delays in the initiation of therapy have been associated with high mortality rates. CASE PRESENTATION: This is a case of an Italian child who was diagnosed with tuberculous meningitis after a history of a month of headache, fatigue and weight loss. Cerebrospinal fluid analysis revealed a lymphocytic pleocytosis with predominance and decreased glucose concentration...
March 13, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28287534/rapid-one-step-enzymatic-synthesis-and-all-aqueous-purification-of-trehalose-analogues
#10
Lisa M Meints, Anne W Poston, Brent F Piligian, Claire D Olson, Katherine S Badger, Peter J Woodruff, Benjamin M Swarts
Chemically modified versions of trehalose, or trehalose analogues, have applications in biology, biotechnology, and pharmaceutical science, among other fields. For instance, trehalose analogues bearing detectable tags have been used to detect Mycobacterium tuberculosis and may have applications as tuberculosis diagnostic imaging agents. Hydrolytically stable versions of trehalose are also being pursued due to their potential for use as non-caloric sweeteners and bioprotective agents. Despite the appeal of this class of compounds for various applications, their potential remains unfulfilled due to the lack of a robust route for their production...
February 17, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28284251/bottom-up-or-top-down-unit-cost-estimation-of-tuberculosis-diagnostic-tests-in-india
#11
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/28284193/low-contribution-of-health-extension-workers-in-identification-of-persons-with-presumptive-pulmonary-tuberculosis-in-ethiopian-somali-region-pastoralists
#12
Fentabil Getnet, Abdiwahab Hashi, Sahardid Mohamud, Hassen Mowlid, Eveline Klinkenberg
BACKGROUND: To accelerate the expansion of primary healthcare coverage, the Ethiopian government started deploying specially trained community health workers named Health Extension Workers (HEWs) in 2003. HEWs work on sixteen health service packages; one being tuberculosis (TB) control and prevention. However, their contribution to TB care and prevention services among pastoralist communities has not been evaluated. Thus, this study has assessed their contribution in identification of persons with presumptive pulmonary TB in Ethiopian Somali Pastoralist Region...
March 11, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/28278406/multidrug-resistant-tuberculosis-in-the-northern-territory-a-10-year-retrospective-case-series
#13
Daniel Judge, Vicki Krause
BACKGROUND AND OBJECTIVE: To describe the clinical characteristics, risk factors, diagnostic modalities, treatments, subsequent outcomes and complications of Multidrug-resistant tuberculosis (MDR-TB) cases residing in the Northern Territory. METHODS: A retrospective case series was conducted of all patients treated for MDR-TB in the Northern Territory between 1 January 2004 and 31 December 2013. This is the first study to analyse data relating to the subset of MDR-TB cases treated in the Northern Territory...
September 30, 2016: Communicable Diseases Intelligence Quarterly Report
https://www.readbyqxmd.com/read/28275074/same-day-diagnostic-and-surveillance-data-for-tuberculosis-via-whole-genome-sequencing-of-direct-respiratory-samples
#14
Antonina A Votintseva, Phelim Bradley, Louise Pankhurst, Carlos Del Ojo Elias, Matthew Loose, Kayzad Nilgiriwala, Anirvan Chatterjee, E Grace Smith, Nicolas Sanderson, Timothy M Walker, Marcus R Morgan, David H Wyllie, A Sarah Walker, Tim E A Peto, Derrick W Crook, Zamin Iqbal
Routine full characterization of Mycobacterium tuberculosis (TB) is culture-based, taking many weeks. Whole-genome sequencing (WGS) can generate antibiotic susceptibility profiles to inform treatment, augmented with strain information for global surveillance; such data could be transformative if provided at or near point of care.We demonstrate a low-cost DNA extraction method for TB WGS direct from patient samples. We initially evaluated the method using the Illumina MiSeq sequencer (40 smear-positive respiratory samples, obtained after routine clinical testing, and 27 matched liquid cultures)...
March 8, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28261194/evaluation-of-the-mean-cost-and-activity-based-cost-in-the-diagnosis-of-pulmonary-tuberculosis-in-the-laboratory-routine-of-a-high-complexity-hospital-in-brazil
#15
Isabela N de Almeida, Lida J de Assis Figueredo, Valéria M Soares, Maria C Vater, Suely Alves, Wânia da Silva Carvalho, Afrânio L Kritski, Silvana S de Miranda
At a global level, with the increase in healthcare costs, there is a need to assess the economic impact of the incorporation of new technologies in different health disorders in different countries. There is scarce information regarding costs incurred with the use of current or new diagnostic tests for tuberculosis or from the vantage point of their incorporation within the healthcare systems of high-burden countries. The present study aimed to assess the mean cost and the activity based cost of the laboratory diagnosis for tuberculosis by means of conventional techniques and from the Detect TB(®)LabTest molecular test kit in a general high-complexity hospital of the public health system in Brazil...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28258004/evaluation-of-genexpert-mtb-rif-for-detection-of-pulmonary-tuberculosis-at-peripheral-tuberculosis-clinics
#16
Yan Shao, Hong Peng, Cheng Chen, Tao Zhu, Ming Ji, Wei Jiang, Wei Zhu, Xiang Jun Zhai, Wei Lu
Tuberculosis is one of the most common infectious diseases in China, while delayed patient finding obstructed disease control, especially for smear-negative patients. The current study was undertaken to evaluate the diagnostic accuracy of GeneXpert MTB/RIF compared with conventional methods in the detection of pulmonary tuberculosis patients. A total of 295 spot sputum samples from confirmed pulmonary tuberculosis patients were evaluated from September 2014 to June 2015. Each sample was examined by acid-fast bacillus smear microscopy, culture and GeneXpert MTB/RIF...
February 28, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28254318/detection-of-esat-6-by-a-label-free-miniature-immuno-electrochemical-biosensor-as-a-diagnostic-tool-for-tuberculosis
#17
Mohamed Fethi Diouani, Oussama Ouerghi, Amira Refai, Kamel Belgacem, Chaker Tlili, Dhafer Laouini, Makram Essafi
Tuberculosis is a worldwide disease considered as a major health problem with high morbidity and mortality rates. Poor detection of Mycobacterium tuberculosis (Mtb), the causative agent of tuberculosis remains a major obstacle to the global control of this disease. Here we report the development of a new test based on the detection of the major virulent factor of Mtb, namely the early secreted antigenic target 6-kDa protein or ESAT-6. A label free electrochemical immunosensor using an anti-ESAT-6 monoclonal antibody as a bio-receptor is described herein...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28250986/severe-tuberculosis-requiring-intensive-care-a-descriptive-analysis
#18
Raquel Pacheco Duro, Paulo Figueiredo Dias, Alcina Azevedo Ferreira, Sandra Margarida Xerinda, Carlos Lima Alves, António Carlos Sarmento, Lurdes Campos Dos Santos
Background. This study aims to describe the characteristics of tuberculosis (TB) patients requiring intensive care and to determine the in-hospital mortality and the associated predictive factors. Methods. Retrospective cohort study of all TB patients admitted to the ICU of the Infectious Diseases Department of Centro Hospitalar de São João (Porto, Portugal) between January 2007 and July 2014. Comorbid diagnoses, clinical features, radiological and laboratory investigations, and outcomes were reviewed. Univariate analysis was performed to identify risk factors for death...
2017: Critical Care Research and Practice
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
#19
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/28212479/-spinal-tuberculosis-experience-in-a-third-level-medical-facility-in-puebla-mexico
#20
Rolando Joshua Medina-Peñasco, Martha Imelda Rosas-Ramírez, Rodolfo Gregorio Barragán-Hervella, Ivan Alvarado-Ortega, Gerardo López-Cázares, Álvaro José Montiel-Jarquín, María Socorro Romero-Figueroa
BACKGROUND: Pott's disease or spinal tuberculosis (STB) is a serious infectious disease, caused by the migration of the bacterium Mycobacterium tuberculosis to the spine. Knowing this disease is a priority for all the physicians. The objective was to show the experience in patients with STB treated in a third level hospital in Puebla, Mexico. METHODS: Descriptive study. From January to December, 2014, we collected information of patients with STB. The variables were age, gender, length of hospital stay, affected segment of the spine, associated diseases, symptoms, diagnostic methods, type of treatment and complication...
2017: Revista Médica del Instituto Mexicano del Seguro Social
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