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https://www.readbyqxmd.com/read/29348166/clinical-evaluation-of-a-blood-assay-to-diagnose-paucibacillary-tuberculosis-via-bacterial-antigens
#1
Chang Liu, Christopher J Lyon, Yang Bu, Zaian Deng, Elisabetta Walters, Yan Li, Liqun Zhang, Anneke C Hesseling, Edward A Graviss, Ye Hu
BACKGROUND: The diagnosis of active tuberculosis (TB)10 cases primarily relies on methods that detect Mycobacterium tuberculosis (Mtb) bacilli or their DNA in patient samples (e.g., mycobacterial culture and Xpert MTB/RIF assays), but these tests have low clinical sensitivity for patients with paucibacillary TB disease. Our goal was to evaluate the clinical performance of a newly developed assay that can rapidly diagnose active TB cases by direct detection of Mtb-derived antigens in patients' blood samples...
January 18, 2018: Clinical Chemistry
https://www.readbyqxmd.com/read/29346642/rnase7-but-not-psoriasin-nor-spla2-iia-associates-to-mycobacterium-tuberculosis-during-airway-epithelial-cells-infection
#2
Flor Torres-Juarez, Lousseine Touqui, Juan Leon-Contreras, Cesar Rivas-Santiago, Jose A Enciso-Moreno, Rogelio Hernández-Pando, Bruno Rivas-Santiago
Tuberculosis (TB) is a disease caused by Mycobacterium tuberculosis (Mtb). Innate immunity is the first line of defense against Mtb and malfunctions in any of its components is associated with the susceptibility to the disease. Epithelial products, such as host defence peptides (HDP) are the first molecules produced to counteract the infection. Although a wide variety of HDP are produced by epithelial cells only few of them have been studied during Mtb infection. Here, we assessed the expression and production of the HDPs: psoriasin, sPLA2-IIA and RNase 7 in airway epithelial cells (NCI-H292), type II pneumocytes (A549 cells) and monocytes-derived macrophages from human peripheral blood mononuclear cells (bMDM) and from the human cell line THP1(MDM) after Mtb in vitro infection...
January 16, 2018: Pathogens and Disease
https://www.readbyqxmd.com/read/29343539/buruli-ulcer-review-of-a-neglected-skin-mycobacterial-disease
#3
Jeannette Guarner
Buruli ulcer is caused by Mycobacterium ulcerans This neglected disease occurs in scattered foci around the world with higher concentration of cases in West Africa. The mycobacteria produce mycolactones that cause tissue necrosis. The disease presents as a painless skin nodule that ulcerates as necrosis expands. Finding acid fast bacilli in smears or histopathology, culturing the mycobacteria, and performing M. ulcerans PCR in presumptive cases confirms the diagnosis. Medical treatment with oral rifampicin and intramuscular streptomycin or oral treatment with rifampicin plus clarithromycin for 8 weeks is supported by the World Health Organization...
January 17, 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29343010/-diagnosis-and-treatment-of-extrapulmonary-non-tuberculous-mycobacterial-diseases
#4
S J Tang, J Gu
No abstract text is available yet for this article.
January 12, 2018: Chinese Journal of Tuberculosis and Respiratory Diseases
https://www.readbyqxmd.com/read/29342164/environmental-dust-inhalation-in-the-european-badger-meles-meles-systemic-distribution-of-silica-laden-macrophages-pathological-changes-and-association-with-mycobacterium-bovis-infection-status
#5
Janne M Schoening, Leigh A L Corner, Locksley L McV Messam, Joseph P Cassidy, Alan Wolfe
Chronic inhalation of crystalline silica and silicates may lead to severe lung disease in humans, termed silicosis. The disease is an occupational health concern in miners and related professions worldwide. Silicosis is also a strong risk factor for tuberculosis in humans. Due to its subterranean lifestyle, the European badger (Meles meles) is continuously exposed to environmental dust, while this species is also susceptible to tuberculosis, caused by Mycobacterium bovis. To date, a thorough investigation of mineral dust retention and its possible implication as a risk factor for mycobacterial infection in badgers has not been performed...
2018: PloS One
https://www.readbyqxmd.com/read/29332619/clinical-characteristics-of-non-tuberculous-mycobacterial-pulmonary-infections-in-bamako-mali
#6
B Kone, Y S Sarro, M Maiga, M Sanogo, A M Somboro, B Diarra, A C G Togo, N Coulibaly, B P P Dembele, D Goita, B Baya, A Kone, S Diabaté, M A Polis, M Belson, S Dao, S Orsega, C J Achenbach, R L Murphy, S Diallo, S Siddiqui
The global spread of non-tuberculous mycobacteria (NTM) may be due to HIV/AIDS and other environmental factors. The symptoms of NTM and tuberculosis (TB) disease are indistinguishable, but their treatments are different. Lack of research on the epidemiology of NTM infections has led to underestimation of its prevalence within TB endemic countries. This study was designed to determine the prevalence and clinical characteristics of pulmonary NTM in Bamako. A cross-sectional study which include 439 suspected cases of pulmonary TB...
January 15, 2018: Epidemiology and Infection
https://www.readbyqxmd.com/read/29330981/comparison-of-ziehl-neelsen-based-light-microscopy-with-led-fluorescent-microscopy-for-tuberculosis-diagnosis-an-insight-from-a-limited-resource-high-burden-setting
#7
Muhammad Yahya Noori, Faiza Ali, Zaheer Ali, Shaheen Sharafat
BACKGROUND: Microscopy is the most widely used tool for Tuberculosis screening. Conventionally, Ziehl-Neelsen (ZN) staining has been the widely used for staining Acid-Fast Bacilli (AFB) but with the advent of Fluorescent staining, Auramine O stain is now being adapted as the preferred method for setups with high workload as it has the advantage of being less laborious, since bacteria fluoresce in front of a dark background and are easier to count. This study was performed to compare the efficiency of the two methods in a high-burden, limited resource setting to see the magnitude of diagnostic accuracy between ZN and Fluorescent Microscopy, using culture as the standard...
October 2017: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/29326013/a-cluster-of-multidrug-resistant-mycobacterium-tuberculosis-among-patients-arriving-in-europe-from-the-horn-of-africa-a-molecular-epidemiological-study
#8
Timothy M Walker, Matthias Merker, Astrid M Knoblauch, Peter Helbling, Otto D Schoch, Marieke J van der Werf, Katharina Kranzer, Lena Fiebig, Stefan Kröger, Walter Haas, Harald Hoffmann, Alexander Indra, Adrian Egli, Daniela M Cirillo, Jérôme Robert, Thomas R Rogers, Ramona Groenheit, Anne T Mengshoel, Vanessa Mathys, Marjo Haanperä, Dick van Soolingen, Stefan Niemann, Erik C Böttger, Peter M Keller
BACKGROUND: The risk of tuberculosis outbreaks among people fleeing hardship for refuge in Europe is heightened. We describe the cross-border European response to an outbreak of multidrug-resistant tuberculosis among patients from the Horn of Africa and Sudan. METHODS: On April 29 and May 30, 2016, the Swiss and German National Mycobacterial Reference Laboratories independently triggered an outbreak investigation after four patients were diagnosed with multidrug-resistant tuberculosis...
January 8, 2018: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/29325687/clinical-significance-and-epidemiologic-analyses-of-mycobacterium-avium-and-mycobacterium-intracellulare-lung-disease-from-post-marketing-surveillance
#9
Katsuhiro Suzuki, Atsuyuki Kurashima, Kinji Tatsuno, Jun-Ichi Kadota
BACKGROUND: In Japan, nontuberculous mycobacterial lung disease is mostly attributable to Mycobacterium avium complex (MAC), i.e., M. avium or M. intracellulare. However, clinical features of the disease caused by these two pathogens have not been studied sufficiently yet. METHODS: A post-marketing survey of clarithromycin was performed at 130 facilities across Japan. The data on patients with M. avium infection and patients with M. intracellulare infection were selected from this survey for comparison of background variables and clinical features of the two pathogens...
January 2018: Respiratory Investigation
https://www.readbyqxmd.com/read/29324800/hepcidin-deficiency-and-iron-deficiency-do-not-alter-tuberculosis-susceptibility-in-a-murine-m-tb-infection-model
#10
Rachel Harrington-Kandt, Elena Stylianou, Lucy A Eddowes, Pei Jin Lim, Lisa Stockdale, Nawamin Pinpathomrat, Naomi Bull, Janet Pasricha, Marta Ulaszewska, Yulia Beglov, Sophie Vaulont, Hal Drakesmith, Helen McShane
Tuberculosis (TB), caused by the macrophage-tropic pathogen Mycobacterium tuberculosis (M.tb) is a highly prevalent infectious disease. Since an immune correlate of protection or effective vaccine have yet to be found, continued research into host-pathogen interactions is important. Previous literature reports links between host iron status and disease outcome for many infections, including TB. For some extracellular bacteria, the iron regulatory hormone hepcidin is essential for protection against infection...
2018: PloS One
https://www.readbyqxmd.com/read/29321020/meta-analysis-of-human-gene-expression-in-response-to-mycobacterium-tuberculosis-infection-reveals-potential-therapeutic-targets
#11
Zhang Wang, Seda Arat, Michal Magid-Slav, James R Brown
BACKGROUND: With the global emergence of multi-drug resistant strains of Mycobacterium tuberculosis, new strategies to treat tuberculosis are urgently needed such as therapeutics targeting potential human host factors. RESULTS: Here we performed a statistical meta-analysis of human gene expression in response to both latent and active pulmonary tuberculosis infections from nine published datasets. We found 1655 genes that were significantly differentially expressed during active tuberculosis infection...
January 10, 2018: BMC Systems Biology
https://www.readbyqxmd.com/read/29313424/why-macrophages-cannot-lap-up-tb
#12
Stefan Köster, Sandeep Upadhyay, Jennifer A Philips
M. tuberculosis causes an enormous worldwide burden of disease. Its success depends upon subverting the antimicrobial capacity of macrophages. We have known for decades that M. tuberculosis impairs phagosomal trafficking to avoid lysosomal degradation, but the mechanism is unclear. Recent work has described a phagolysosomal pathway called LC3-associated phagocytosis (LAP), in which LC3 associates with microbe-containing phagosomes. Macrophage pathogen recognition receptors (PRRs) initiate LAP, and NADPH oxidase and RUBCN/RUBICON are required for LAP...
January 9, 2018: Autophagy
https://www.readbyqxmd.com/read/29311364/isg15-induced-il-10-is-a-novel-anti-inflammatory-myeloid-axis-disrupted-during-active-tuberculosis
#13
Paula Fernandes Dos Santos, Johan Van Weyenbergh, Murilo Delgobo, Daniel de Oliveira Patricio, Brian J Ferguson, Rodrigo Guabiraba, Tim Dierckx, Soraya Maria Menezes, André Báfica, Daniel Santos Mansur
IFN-stimulated gene 15 (ISG15) deficiency in humans leads to severe IFNopathies and mycobacterial disease, the latter being previously attributed to its extracellular cytokine-like activity. In this study, we demonstrate a novel role for secreted ISG15 as an IL-10 inducer, unique to primary human monocytes. A balanced ISG15-induced monocyte/IL-10 versus lymphoid/IFN-γ expression, correlating with p38 MAPK and PI3K signaling, was found using targeted in vitro and ex vivo systems analysis of human transcriptomic datasets...
January 8, 2018: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29310595/potential-of-dosr-and-rpf-antigens-from-mycobacterium-tuberculosis-to-discriminate-between-latent-and-active-tuberculosis-in-a-tuberculosis-endemic-population-of-medellin-colombia
#14
Leonar Arroyo, Diana Marín, Kees L M C Franken, Tom H M Ottenhoff, Luis F Barrera
BACKGROUND: Tuberculosis (TB) remains one of the most deadly infectious diseases. One-third to one-fourth of the human population is estimated to be infected with Mycobacterium tuberculosis (Mtb) without showing clinical symptoms, a condition called latent TB infection (LTBI). Diagnosis of Mtb infection is based on the immune response to a mixture of mycobacterial antigens (PPD) or to Mtb specific ESAT-6/CFP10 antigens (IGRA), highly expressed during the initial phase of infection. However, the immune response to PPD and IGRA antigens has a low power to discriminate between LTBI and PTB...
January 8, 2018: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29305538/false-positive-xpert-mtb-rif-results-in-re-tested-patients-with-previous-tuberculosis-frequency-profile-and-prospective-clinical-outcomes
#15
Grant Theron, Rouxjeane Venter, Liezel Smith, Aliasgar Esmail, Philippa Randall, Vishesh Sood, Suzette Oelfese, Greg Calligaro, Robin Warren, Keertan Dheda
Introduction: Globally, Xpert MTB/RIF (Xpert) is the most widely-used PCR test for tuberculosis (TB). Positive results in previously-treated patients, which are due to old DNA or active disease, are a diagnostic dilemma.Materials and methods: We prospectively re-tested sputum from 238 patients, irrespective of current symptoms, who were previously-diagnosed as Xpert-positive and treated successfully. Patients who re-tested as Xpert-positive, culture-negative were exhaustively investigated (repeated culture, chest radiography, bronchoscopy with bronchoalveolar lavage, long-term clinical follow-up)...
January 5, 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29305460/delays-in-the-diagnosis-and-treatment-of-bone-and-joint-tuberculosis-in-the-united-kingdom
#16
C Broderick, S Hopkins, D J F Mack, W Aston, R Pollock, J A Skinner, S Warren
AIMS: Tuberculosis (TB) infection of bones and joints accounts for 6.7% of TB cases in England, and is associated with significant morbidity and disability. Public Health England reports that patients with TB experience delays in diagnosis and treatment. Our aims were to determine the demographics, presentation and investigation of patients with a TB infection of bones and joints, to help doctors assessing potential cases and to identify avoidable delays. PATIENTS AND METHODS: This was a retrospective observational study of all adults with positive TB cultures on specimens taken at a tertiary orthopaedic centre between June 2012 and May 2014...
January 2018: Bone & Joint Journal
https://www.readbyqxmd.com/read/29302700/immunization-with-an-adenovirus-vectored-tb-vaccine-containing-ag85a-mtb32-effectively-alleviates-allergic-asthma
#17
Yiling Zhang, Ying Feng, Liang Li, Xianmiao Ye, Jinlin Wang, Qian Wang, Pingchao Li, Na Li, Xuehua Zheng, Xiang Gao, Chufang Li, Feng Li, Baoqing Sun, Kefang Lai, Zhong Su, Nanshan Zhong, Ling Chen, Liqiang Feng
Current treatments for allergic asthma primarily ameliorate symptoms rather than inhibit disease progression. Regulating the excessive T helper type 2 (Th2) responses may prevent asthma exacerbation. In this study, we investigated the protective effects of Ad5-gsgAM, an adenovirus vector carrying two mycobacterial antigens Ag85A and Mtb32, against allergic asthma. Using an ovalbumin (OVA)-induced asthmatic mouse model, we found that Ad5-gsgAM elicited much more Th1-biased CD4+T and CD8+T cells than bacillus Calmette-Guérin (BCG)...
January 4, 2018: Journal of Molecular Medicine: Official Organ of the "Gesellschaft Deutscher Naturforscher und Ärzte"
https://www.readbyqxmd.com/read/29259832/gain-of-function-mutations-in-stat1-a-recently-defined-cause-for-chronic-mucocutaneous-candidiasis-disease-mimicking-combined-immunodeficiencies
#18
Sanem Eren Akarcan, Ezgi Ulusoy Severcan, Neslihan Edeer Karaca, Esra Isik, Guzide Aksu, Mélanie Migaud, Ferda Evin Gurkan, Elif Azarsiz, Anne Puel, Jean-Laurent Casanova, Necil Kutukculer
Chronic Mucocutaneous Candidiasis (CMC) is the chronic, recurrent, noninvasive Candida infections of the skin, mucous membranes, and nails. A 26-month-old girl was admitted with the complaints of recurrent oral Candidiasis, diarrhea, and respiratory infections. Candida albicans grew in oral mucosa swab. CMV and EBV DNA titers were elevated. She had hypergammaglobulinemia; IgE level, percentages of lymphocyte subgroups, and in vitro T-cell proliferation responses were normal. She had parenchymal nodules within the lungs and a calcific nodule in the liver...
2017: Case Reports in Immunology
https://www.readbyqxmd.com/read/29258402/pathology-of-the-emerging-mycobacterium-tuberculosis-complex-pathogen-mycobacterium-mungi-in-the-banded-mongoose-mungos-mungo
#19
Kathleen A Alexander, Peter N Laver, Mark C Williams, Claire E Sanderson, Carly Kanipe, Mitchell V Palmer
Wild banded mongooses ( Mungos mungo) in northeastern Botswana and northwest Zimbabwe are infected with a novel Mycobacterium tuberculosis complex (MTC) pathogen, Mycobacterium mungi. We evaluated gross and histologic lesions in 62 infected mongooses (1999-2017). Many tissues contained multifocal irregular, lymphohistiocytic to granulomatous infiltrates and/or multifocal or coalescing noncaseating to caseating granulomas with variable numbers of intralesional acid-fast bacilli. Over one-third of nasal turbinates examined had submucosal lymphohistiocytic to granulomatous infiltrates, erosion and ulceration of the nasal mucosa, bony remodeling, and nasal distortion...
January 1, 2017: Veterinary Pathology
https://www.readbyqxmd.com/read/29258190/ifn-%C3%AE-a-contentious-player-in-host-pathogen-interaction-in-tuberculosis
#20
REVIEW
Naveed Sabir, Tariq Hussain, Syed Zahid Ali Shah, Deming Zhao, Xiangmei Zhou
Tuberculosis (TB) is a major health threat to the human population worldwide. The etiology of the disease is Mycobacterium tuberculosis (Mtb), a highly successful intracellular pathogen. It has the ability to manipulate the host immune response and to make the intracellular environment suitable for its survival. Many studies have addressed the interactions between the bacteria and the host immune cells as involving many immune mediators and other cellular players. Interferon-β (IFN-β) signaling is crucial for inducing the host innate immune response and it is an important determinant in the fate of mycobacterial infection...
December 16, 2017: International Journal of Molecular Sciences
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