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https://www.readbyqxmd.com/read/27914088/murine-mycobacterium-marinum-infection-as-a-model-for-tuberculosis
#1
Julia Lienard, Fredric Carlsson
Mycobacteria are a major human health problem globally. Regarding tuberculosis the situation is worsened by the poor efficacy of current vaccine regimens and by emergence of drug-resistant strains (Manjelievskaia J et al, Trans R Soc Trop Med Hyg 110: 110, 2016; Pereira et al., Lancet Infect Dis 12:300-306, 2012; http://www.who.int/tb/publications/global_report/en/) undermining both disease-prevention and available treatments. Thus, increased basic understanding of mycobacterial-and particularly Mycobacterium tuberculosis-virulence strategies and pathogenesis is of great importance...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27904647/prevalence-of-latent-tuberculosis-infection-in-healthcare-workers-at-a-hospital-in-naples-italy-a-low-incidence-country
#2
Monica Lamberti, Mariarosaria Muoio, Antonio Arnese, Sharon Borrelli, Teresa Di Lorenzo, Elpidio Maria Garzillo, Giuseppe Signoriello, Stefania De Pascalis, Nicola Coppola, Albert Nienhaus
BACKGROUND: Healthcare workers (HCWs) are at higher risk than the general population of contracting tuberculosis (TB). Moreover, although subjects with latent TB infection (LTBI) are asymptomatic and are not infectious, they may eventually develop active disease. Thus, a fundamental tool of TB control programs for HCWs is the screening and treatment of LTBI. METHODS: From January 2014 to January 2015, hospital personnel at Azienda Ospedaliera Universitaria, Naples, Italy, were screened for TB...
2016: Journal of Occupational Medicine and Toxicology
https://www.readbyqxmd.com/read/27892960/new-genome-wide-algorithm-identifies-novel-in-vivo-expressed-mycobacterium-tuberculosis-antigens-inducing-human-t-cell-responses-with-classical-and-unconventional-cytokine-profiles
#3
Mariateresa Coppola, Krista E van Meijgaarden, Kees L M C Franken, Susanna Commandeur, Gregory Dolganov, Igor Kramnik, Gary K Schoolnik, Inaki Comas, Ole Lund, Corine Prins, Susan J F van den Eeden, Gro E Korsvold, Fredrik Oftung, Annemieke Geluk, Tom H M Ottenhoff
New strategies are needed to develop better tools to control TB, including identification of novel antigens for vaccination. Such Mtb antigens must be expressed during Mtb infection in the major target organ, the lung, and must be capable of eliciting human immune responses. Using genome-wide transcriptomics of Mtb infected lungs we developed data sets and methods to identify IVE-TB (in-vivo expressed Mtb) antigens expressed in the lung. Quantitative expression analysis of 2,068 Mtb genes from the predicted first operons identified the most upregulated IVE-TB genes during in-vivo pulmonary infection...
November 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27888179/predicting-tuberculosis-risk-in-the-foreign-born-population-of-british-columbia-canada-study-protocol-for-a-retrospective-population-based-cohort-study
#4
Lisa A Ronald, Jonathon R Campbell, Robert F Balshaw, David Z Roth, Kamila Romanowski, Fawziah Marra, Victoria J Cook, James C Johnston
INTRODUCTION: Improved understanding of risk factors for developing active tuberculosis (TB) will better inform decisions about diagnostic testing and treatment for latent TB infection (LTBI) in migrant populations in low-incidence regions. We aim to examine TB risk factors among the foreign-born population in British Columbia (BC), Canada, and to create and validate a clinically relevant multivariate risk score to predict active TB. METHODS AND ANALYSIS: This retrospective population-based cohort study will include all foreign-born individuals who acquired permanent resident status in Canada between 1 January 1985 and 31 December 2013 and acquired healthcare coverage in BC at any point during this period...
November 25, 2016: BMJ Open
https://www.readbyqxmd.com/read/27879136/optimal-control-of-a-tuberculosis-model-with-state-and-control-delays
#5
Cristiana J Silva, Helmut Maurer, Delfim F M Torres
We introduce delays in a tuberculosis (TB) model, representing the time delay on the diagnosis and commencement of treatment of individuals with active TB infection. The stability of the disease free and endemic equilibriums is investigated for any time delay. Corresponding optimal control problems, with time delays in both state and control variables, are formulated and studied. Although it is well-known that there is a delay between two to eight weeks between TB infection and reaction of body's immune system to tuberculin, delays for the active infected to be detected and treated, and delays on the treatment of persistent latent individuals due to clinical and patient reasons, which clearly justifies the introduction of time delays on state and control measures, our work seems to be the first to consider such time-delays for TB and apply time-delay optimal control to carry out the optimality analysis...
February 1, 2017: Mathematical Biosciences and Engineering: MBE
https://www.readbyqxmd.com/read/27879023/potential-effect-of-ezetimibe-against-mycobacterium-tuberculosis-infection-in-type-ii-diabetes
#6
I-Fang Tsai, Chiu-Ping Kuo, Andrew B Lin, Ming-Nan Chien, Hsin-Tsung Ho, Tsai-Yin Wei, Chien-Liang Wu, Yen-Ta Lu
BACKGROUND AND OBJECTIVE: Tuberculosis (TB) risk might be increased in patients with diabetes by factors other than hyperglycaemia, such as dyslipidaemia. Host lipids are essential energy sources used by mycobacteria to persist in a latent TB state. A potential therapy targeting cholesterol catabolism of mycobacteria has been proposed, but the potential of cholesterol-lowering drugs as anti-TB therapy is unclear. The purpose of this study was to determine the effects of ezetimibe, a 2-azetidinone cholesterol absorption inhibitor, on intracellular mycobacteria survival and dormancy...
November 23, 2016: Respirology: Official Journal of the Asian Pacific Society of Respirology
https://www.readbyqxmd.com/read/27872018/preventive-therapy-for-latent-tuberculosis-infection-the-promise-and-the-challenges
#7
REVIEW
G J Fox, C C Dobler, B J Marais, J T Denholm
Around one third of the world's population may harbour latent tuberculosis infection (LTBI), an asymptomatic immunological state that confers a heightened risk of subsequently developing tuberculosis (TB). Effectively treating LTBI will be essential if the End TB Strategy is to be realised This review evaluates the evidence the effectiveness preventive antibiotic therapy to treat LTBI due to both drug susceptible and drug resistant bacteria. We summarise current national and international preventive therapy guidelines, as well as ongoing randomised trials evaluating regimen to prevent drug resistant TB...
November 18, 2016: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/27871809/biomarkers-for-discrimination-between-latent-tuberculosis-infection-and-active-tuberculosis-disease
#8
Eun-Jeong Won, Jung-Ho Choi, Young-Nan Cho, Hye-Mi Jin, Hae Jin Kee, Yong-Wook Park, Yong-Soo Kwon, Seung-Jung Kee
OBJECTIVE: We aimed to determine whether combinations of multiplex cytokine responses could differentiate Mycobacterium tuberculosis (Mtb) infection states. METHODS: Mtb-specific antigen-induced and unstimulated cytokines were measured by Luminex assay in supernatants of QuantiFERON(®) Gold In-Tube assay (QFT) in 48 active pulmonary TB patients (TB), 15 latent TB infection subjects (LTBI), and 13 healthy controls (HCs). RESULTS: Among the 29 cytokines, eight Mtb antigen-specific biomarkers (GM-CSF, IFN-γ, IL-1RA, IL-2, IL-3, IL-13, IP-10, and MIP-1β) in the Mtb-infected group were significantly different from those of the HCs...
November 19, 2016: Journal of Infection
https://www.readbyqxmd.com/read/27867751/t7-phage-display-library-a-promising-strategy-to-detect-tuberculosis-specific-biomarkers
#9
Harvinder Talwar, Jaya Talreja, Lobelia Samavati
One-third of the world's population is infected with tuberculosis, only 10% will develop active disease and the remaining 90% is considered to have latent TB (LTB). While active TB is contagious and can be lethal, the LTB can evolve to active TB. The diagnosis of TB can be challenging, especially in the early stages, due to the variability in presentation and nonspecific signs and symptoms. Currently, we have limited tools available to diagnose active TB, predict treatment efficacy and cure of active tuberculosis, the reactivation of latent tuberculosis infection, and the induction of protective immune responses through vaccination...
June 2016: Mycobacterial Diseases: Tuberculosis & Leprosy
https://www.readbyqxmd.com/read/27866487/tuberculosis-infection-testing-in-hiv-positive-men-who-have-sex-with-men-from-xi-an-china
#10
H N Xin, X W Li, L Zhang, Z Li, H R Zhang, Y Yang, M F Li, B X Feng, H J Li, L Gao
In individuals with latent tuberculosis (TB) infection, those living with human immunodeficiency virus (HIV) had a 20-37 times higher risk of developing active TB compared to those without HIV infection. Systematic testing and treatment of latent TB infection are priorities in HIV-infected persons. In China, the prevalence of HIV infection in men who have sex with men (MSM) has gradually increased in the past decade. However, the prevalence of TB infection has been studied sparsely in HIV-infected MSM. Hence, we conducted a pilot study in MSM living with HIV infection in Xi'an city to evaluate TB infection status by means of interferon-γ release assay (IGRA)...
November 21, 2016: Epidemiology and Infection
https://www.readbyqxmd.com/read/27866367/risk-for-latent-and-active-tuberculosis-in-germany
#11
Christian Herzmann, Giovanni Sotgiu, Oswald Bellinger, Roland Diel, Silke Gerdes, Udo Goetsch, Helga Heykes-Uden, Tom Schaberg, Christoph Lange
PURPOSE: Few individuals that are latently infected with M. tuberculosis latent tuberculosis infection(LTBI) progress to active disease. We investigated risk factors for LTBI and active pulmonary tuberculosis (PTB) in Germany. METHODS: Healthy household contacts (HHCs), health care workers (HCWs) exposed to M. tuberculosis and PTB patients were recruited at 18 German centres. Interferon-γ release assay (IGRA) testing was performed. LTBI risk factors were evaluated by comparing IGRA-positive with IGRA-negative contacts...
November 19, 2016: Infection
https://www.readbyqxmd.com/read/27865379/antibodies-and-tuberculosis
#12
REVIEW
Ashley J Jacobs, Juthathip Mongkolsapaya, Gavin R Screaton, Helen McShane, Robert J Wilkinson
Tuberculosis (TB) remains a major public health problem internationally, causing 9.6 million new cases and 1.5 million deaths worldwide in 2014. The Bacillus Calmette-Guérin vaccine is the only licensed vaccine against TB, but its protective effect does not extend to controlling the development of infectious pulmonary disease in adults. The development of a more effective vaccine against TB is therefore a pressing need for global health. Although it is established that cell-mediated immunity is necessary for the control of latent infection, the presupposition that such immunity is sufficient for vaccine-induced protection has recently been challenged...
December 2016: Tuberculosis
https://www.readbyqxmd.com/read/27865378/development-of-immune-biomarkers-of-pulmonary-tuberculosis-in-a-rabbit-model
#13
Ali Dehnad, Resmi Ravindran, Selvakumar Subbian, Imran H Khan
Tuberculosis (TB) causes extensive morbidity and mortality worldwide with approximately 10 million new cases of active disease emerging mostly from a pool of two billion individuals latently infected with Mycobacterium tuberculosis (M. tb) every year. The underlying host immune responses that drive M. tb infection to active disease or latency are not well understood. We propose that identification and characterization of host immune biomarkers will be helpful to better understand the mechanisms that drive this process, and may, in addition, lead to the development of better diagnostic tools for TB...
December 2016: Tuberculosis
https://www.readbyqxmd.com/read/27855476/-tuberculosis-contact-investigation-eight-years-of-experience-with-the-quantiferon-tb%C3%A2-gold-in-tube-in-lower-saxony-germany
#14
M Scharlach, K Brakensiek
Since the beginning of the 21(st) century, beside tuberculin skin tests (TST) and chest X-rays, interferon-gamma release assays (IGRA) have become available for diagnosing latent tuberculosis infection. In 2006, the Governmental Institute of Public Health of Lower Saxony (NLGA) established the IGRA in its laboratory, using the QuantiFERON-TB(®)Gold In-Tube (QFT). A cohort of 19 309 contact persons who were investigated during contact tracing by local public health departments (LPHD) was analyzed. Within 3 years, 75% of LPHDs in Lower Saxony established the QFT for tuberculosis contact tracing...
November 17, 2016: Das Gesundheitswesen
https://www.readbyqxmd.com/read/27853753/elevated-circulating-concentrations-of-interferon-gamma-in-latent-tuberculosis-infection
#15
Moises A Huaman, George S Deepe, Carl J Fichtenbaum
BACKGROUND: Latent tuberculosis infection (LTBI) has been associated with increased immune activation. We assessed circulating concentrations of interferon-gamma in persons with LTBI. METHODS: We used the 2011-2012 National Health Nutritional Examination Survey (NHANES) to identify adults with and without LTBI by QuantiFERON(®)-TB Gold In-Tube (QFT) results. Non-LTBI persons were 1:1 age-, gender-, and race-matched to LTBI persons using propensity scores. We compared the plasma concentrations of interferon-gamma measured from the unstimulated, negative control QFT tube between LTBI and non-LTBI persons...
October 2016: Pathogens & Immunity
https://www.readbyqxmd.com/read/27852671/highly-multiplexed-proteomic-analysis-of-quantiferon-supernatants-to-identify-biomarkers-of-latent-tuberculosis-infection
#16
Mary Ann De Groote, Michael Higgins, Thomas Hraha, Kirsten Wall, Michael L Wilson, David G Sterling, Nebojsa Janjic, Randall Reves, Urs A Ochsner, Robert Belknap
The tests for diagnosing latent tuberculosis infection (LTBI) are limited by poor predictive value for identifying people at highest risk for progression to active TB, and have varying sensitivity and specificity in different populations. The identification of a more robust signature for LTBI is important for TB prevention and elimination. A pilot study was conducted with samples from immigrants to the U.S. that were screened for LTBI by the three commercially approved tests: Tuberculin Skin Test (TST), QuantiFERON-TB Gold In-Tube (QFT-GIT), and T-SPOT...
November 16, 2016: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/27842624/health-system-challenges-an-obstacle-to-the-success-of-isoniazid-preventive-therapy
#17
E I Okoli, L Roets
BACKGROUND: The researchers identified infection with HIV as the strongest risk factor in the reactivation of latent tuberculosis (TB) infection or progression to active disease. Isoniazid preventive therapy (IPT) is one of the interventions recommended by the World Health Organization and the South African (SA) National Department of Health to prevent progression to active TB disease in people living with HIV. Adherence to IPT is therefore the responsibility of healthcare clients and clinicians...
November 2, 2016: South African Medical Journal, Suid-Afrikaanse Tydskrif Vir Geneeskunde
https://www.readbyqxmd.com/read/27837110/early-whole-blood-transcriptional-signatures-are-associated-with-severity-of-lung-inflammation-in-cynomolgus-macaques-with-mycobacterium-tuberculosis-infection
#18
Hannah P Gideon, Jason A Skinner, Nicole Baldwin, JoAnne L Flynn, Philana Ling Lin
Whole blood transcriptional profiling offers great diagnostic and prognostic potential. Although studies identified signatures for pulmonary tuberculosis (TB) and transcripts that predict the risk for developing active TB in humans, the early transcriptional changes immediately following Mycobacterium tuberculosis infection have not been evaluated. We evaluated the gene expression changes in the cynomolgus macaque model of TB, which recapitulates all clinical aspects of human M. tuberculosis infection, using a human microarray and analytics platform...
December 15, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27836953/correlates-of-tuberculosis-risk-predictive-biomarkers-for-progression-to-active-tuberculosis
#19
REVIEW
Elisa Petruccioli, Thomas J Scriba, Linda Petrone, Mark Hatherill, Daniela M Cirillo, Simone A Joosten, Tom H Ottenhoff, Claudia M Denkinger, Delia Goletti
New approaches to control the spread of tuberculosis (TB) are needed, including tools to predict development of active TB from latent TB infection (LTBI). Recent studies have described potential correlates of risk, in order to inform the development of prognostic tests for TB disease progression. These efforts have included unbiased approaches employing "omics" technologies, as well as more directed, hypothesis-driven approaches assessing a small set or even individual selected markers as candidate correlates of TB risk...
December 2016: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/27836793/european-policies-in-the-management-of-tuberculosis-among-migrants
#20
Lia D'Ambrosio, Rosella Centis, Masoud Dara, Ivan Solovic, Giorgia Sulis, Alimuddin Zumla, Giovanni Battista Migliori
Globally 10.4 million new TB incident cases were estimated to have occurred in 2015, of which 3% were reported in the European Region of the World Health Organization. Importantly, about 25% of the global multidrug-resistant TB (MDR-TB) cases are reported in the European Region, representing one of the greatest challenges of TB control particularly in Former Soviet Union Countries. Over a quarter of TB cases in the European Union and European Economic Area (EU/EEA) are reported among foreign-born individuals...
November 8, 2016: International Journal of Infectious Diseases: IJID
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