tuberculin test

..In Japan, QFT test was recognized for diagnostic tool on April 2005, and adopted officially on January 2006. Tuberculosis Society issued Guideline for using QFT-2G on May 2006...

..QFT-G was successfully implemented as a confirmatory test for screening of TB infection...

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..A recent meta-analysis showed that IGRAs have high specificity, even among populations that have received bacille Calmette-Guérin (BCG) vaccination. Sensitivity was suboptimal for TST and IGRAs...

..tuberculosis. The term "setting" has been chosen over the term "facility," used in the previous guidelines, to broaden the potential places for which these guidelines apply...

..The strategic deployment of ancillary in vitro tests alongside the primary skin tests has enhanced the detection of M. bovis-infected cattle and reduced the number of animals slaughtered as false positives...

..To evaluate the effectiveness of available rapid diagnostic tests to identify tuberculosis (TB) infection...

..To address this, we investigated the response to TST and IGRA in household contacts of infectious TB cases in a TB high-burden country and the potential correlation with development of TB...

..only limited data are available on the predictive value of interferon-γ release assays for progression from latent tuberculosis infection to active tuberculosis (TB)...

..In summary, the main issue regarding testing is to restrict it to those who are known to be at higher risk of developing tuberculosis and who are willing to accept preventive chemotherapy...

..Currently, the rate of completion of treatment is low...

..The authors examined the sensitivity of commercially available IGRA to diagnose active TB in children in the UK compared with the tuberculin skin test (TST)...

..There are limited data comparing interferon-gamma release assays (IGRAs) for the detection of Mycobacterium tuberculosis infection in highly endemic settings...

..Crowded townships of Cape Town, South Africa, where human immunodeficiency virus (HIV) prevalence and tuberculosis (TB) notification rates are among the highest in the world...

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..Tygerberg district, Western Cape Province, South Africa...

..Holsteins), which were kept on pasture in the central highlands of Ethiopia, using a comparative intradermal tuberculin test, postmortem examination, and bacteriology. The overall prevalence of bovine TB was 13...

..Available evidence reinforces the need to design and implement simple, effective, and affordable TB infection-control programs in health-care facilities in these countries...

..Assessment of within-subject IGRA variability will aid in establishing thresholds for conversions and reversions, and interpretation of serial testing results...

..A new generation of diagnostic tests, the interferon-gamma release assays (IGRAs), have been developed for the detection of latent tuberculosis infection (LTBI). Limited data are available on their use in HIV-infected persons...

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..In a pilot study, we determined conversions and reversions using QuantiFERON-TB Gold In-Tube((R)) (QFT) among household contacts of TB cases, and evaluated the effect of using various definitions and criteria for conversions...

..The role of new T-cell-based blood tests for tuberculosis in the diagnosis of active tuberculosis is unclear...

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..The desensitising effect is associated with decreased IL-1beta and elevated IL-10 responses, but importantly, does not influence antigen specific IFN-gamma responses...

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..However, both IGRAs have methodological and performance characteristics that limit their usefulness in refugee children, highlighting the need for continued development of screening strategies...

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..The role of IGRAs in active TB is less clear but they may be useful as adjunctive tests in the diagnostic work-up of an individual with suspected TB. Finally, recent developments and future directions in IGRA development are reviewed...

..To determine ocular signs predictive of tubercular uveitis...

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..Silicosis is a well-recognized risk factor for tuberculosis (TB)...

..TB-in immigrant contacts of sputum smear-positive TB patients...

..This paper explores the implications of using different methods to estimate prevalence of infection and ARTI. The effect of BCG vaccination on these estimates is also investigated...

..A difference in the cellular immune response between zebu and Holstein cattle was observed, while tuberculosis lesion severities were identical in the two breeds, when both were kept in a pasture...

..To analyse the performance of a new M. tuberculosis-specific interferon gamma (IFNgamma) assay in patients with chronic inflammatory diseases who receive immunosuppressive drugs, including tumour necrosis factor alpha (TNFalpha) inhibitors...

..A strong association between the degree of sputum positivity and T-SPOT.TB score was found. The sensitivity of the T-SPOT.TB assay in active disease may be less impaired by advanced immunosuppression...

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..risk factors was based on comparisons of the reactivity of the cattle in the single comparative intradermal tuberculin test (SCITT). Older cattle were more affected by the disease than yearlings and calves (p<0.0001)...

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..The aim of the present study was to evaluate the performance of an enzyme-linked immunosorbent assay (ELISA)-based IGRA for detecting TB in children...

..To determine the role of the QuantiFERON-TB Gold In-Tube (QFT) (Cellestis Inc., Carnegie, Australia) assay in the diagnosis of tuberculosis (TB) uveitis...

..6%, a specificity of 91.0%, and positive and negative predictive values of 17.7% and 99.5%, respectively. Risk assessment can be an accurate means of identifying candidates for tuberculin screening...

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..82). This suggests that the enumeration of MTB-specific CD4+ T cells might introduce greater specificity for the diagnosis of latent TB, compared to the TST...

..Only 2 of 5 positive QFT-GIT assay results could be confirmed with repeat analyses. Indeterminate results were associated with potential immunosuppression...

..46). In HIV-1 infection, TST and QFT-G-IT immune responses are both strongly related to the degree of immunodeficiency, while results of the T-Spot.TB are independent of the level of CD4+ T-cell depletion...

..To evaluate the performance of QuantiFERON-TB GOLD (QFTG) in a resource-poor setting among patients with and without HIV infection...

..The goal for tuberculosis (TB) elimination in the United States is a TB disease incidence of less than 1 per million U.S. population by 2010, which requires that the latent TB infection (LTBI) prevalence be less than 1% and decreasing...

..TB (Oxford Immunotec, Abingdon, United Kingdom) show promise of greater accuracy, but they may also be affected by impaired cellular immunity, resulting in indeterminate results (ie, insufficient response in positive-control wells)...

..This article critically analyzes the role of these tests in supporting the diagnosis of tuberculous uveitis and proposes a practical diagnostic approach, based on a judicious combination of these tests...

..5%). Thus, our study demonstrates the importance of defining local, relevant cutoff values to maximize test sensitivity, and we suggest the application of the >2-mm cutoff for testing of cattle in central Ethiopia...

..effectively prohibited because BCG, the only potentially available cattle TB vaccine, compromises the current tuberculin test. The main objective of this study was to identify specific antigens, which could increase the test ..

..In this study, we assessed the sensitivity of Interferon gamma release assay (IGRA) in active tuberculosis patients who were positive for HIV infection and compared it with that of tuberculin skin test (TST)...

..To test the efficacies of a strategy for preventing tuberculosis (TB) in Indian patients with inflammatory rheumatic diseases (IRD) treated with tumor necrosis factor-alpha (TNF-alpha) inhibitor...

..However, the optimal cutpoint for HIV-infected individuals was consistently 0 mm. This calibration method may provide a valuable tool for interpreting TST results in other populations...

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..3% (95% CI 1.3-5.3%) for T-SPOT.TB. Sensitivity was 100%, 88%, 63% and 75%, respectively. The predictive values of QFT-GIT, T-SPOT.TB and TST for progression to TB disease among immigrant close contacts were comparable...

..A high tuberculosis (TB) burden area in South Africa (notification rate for all TB cases 1400 per 100 000 population)...

..To evaluate the performance of the QuantiFERON(R)-TB Gold (QFT-G) test for screening tuberculosis (TB) contacts and estimating their risk of progressing to active TB disease...

..To determine whether interferon-gamma release assays (IGRAs) improve the identification of HIV-infected individuals who could benefit from latent tuberculosis infection therapy...

..We estimated the prevalence of M. tuberculosis infection by IGRA and TST in HHCs and their source population (SP), and assessed whether IFNgamma levels in HHCs correlate with tuberculosis development...

..National guidelines recommend targeted tuberculin testing and treatment of latent tuberculosis infection (LTBI) among high-risk groups but discourage testing low-risk persons...

..While adult TB results from both recent and past infection, childhood TB results from recent infection and reflects ongoing transmission despite current TB control strategies...

..3% (k = 0.64); rCM-WBIA positivity was associated with a larger TST induration. These results suggest that rCM-WBIA, based on the recombinant fusion protein CFP21-MPT64, is a promising alternative diagnostic tool for detection of LTBI...

..More-accurate T cell-based tests of infection could enhance diagnosis by optimizing interpretation of the TST results...

..The intradermal tuberculin test, enzyme-linked immunosorbent assay serology, the blood tuberculosis test, and nucleic acid amplification and ..

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..To evaluate an enzyme-linked immunospot assay (ELISPOT) for the diagnosis of tuberculosis (TB) in HIV-infected children with suspected TB and to compare the performance of ELISPOT with the tuberculin skin test (TST)...

..We conclude that administrative measures for infection control can significantly reduce LTBI among HCWs in high-burden countries and should be implemented even when resources are not available for engineering infection control measures...

..When scoring QuantiFERON TB-2G test results for elderly and immunocompromised patients, one must be careful because the possibility of obtaining determinate results may be low even if the test is repeated...

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..This report is aimed at public health officials, health-care providers, and laboratory workers with responsibility for TB control activities in the United States...

..The questionable performance of QFT-G in this setting is not unexpected, as the negative predictive value of a test decreases with increasing prevalence...

..Further research is needed in HIV-1 positive children and adolescents with and without TB in order to validate rapid diagnosis methods for TB...

..However, TST specificity is reduced by bacille Calmette-Guérin (BCG) vaccination and exposure to non-tuberculous mycobacteria (NTM)...

..These data have important implications for the clinical care of patients with HIV infection in areas of the world with a high prevalence of Mycobacterium tuberculosis infection...

..The positive (PPV) and negative predictive values (NPV) for TB were respectively 3.3% and 99.8%. The PPV was 2.3% and the NPV 99.1% for TST >or= 15 mm, and the NPV was 99.5% for TST >or= 6 mm in combination with a negative QFT-G...

..To investigate the use of new gamma-interferon (IFN-gamma)-based blood tests to determine whether or not a higher-than-expected proportion of positive tuberculin skin tests (TSTs) were due to tuberculosis infection...

..Therefore, a program of routine tuberculin skin testing and specific TB infection control guidelines are needed for this population...

..Interferon-γ-release assays (IGRAs) have been developed for the diagnosis of tuberculosis infection, but few data are available for children. There currently is no reference standard for the diagnosis of tuberculosis infection...

..An investigation found no active cases of tuberculosis in humans; however, tuberculin skin-test conversions in humans were associated with training elephants and attending an elephant necropsy...

..We sought to compare the tuberculin skin test (TST) to the QuantiFERON-TB Gold In-Tube assay (QFT-IT) and assess the effects of malnourishment and intestinal helminth infection on QFT-IT results...

..In Bacillus Calmette-Guérin-vaccinated children, the TST cut-off point of ≥ 10 mm had poorer specificity (86%), and a cut-off point of ≥ 15 mm resulted in reduced sensitivity (60%)...

..Contacts of tuberculosis (TB) cases identified from eight Provincial databases in British Columbia, Canada, between 1990 and 2000...

..Among children who were not BCG vaccinated but had a positive tuberculin skin test, QFN-G-IT was negative in 53.3% of cases, and T-SPOT.TB was negative in 50% of cases...

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..BCG vaccination was widely employed following World War I. The modern era of tuberculosis treatment and control was heralded by the discovery of streptomycin in 1944 and isoniazid in 1952...

..properties of Rv1168c, a member of the PPE family, in comparison with PPD, which is routinely used in the tuberculin test, and Hsp60 and ESAT-6, well-known immunodominant antigens of Mycobacterium tuberculosis...

..We sought to validate the routine clinical use of the T-SPOT.TB test (Oxford Immunotec; Oxford, UK), an IGRA, in a predominantly foreign-born population with a high rate of BCG vaccination...

..001). If studies confirm that this difference is due to higher specificity of this IGRA, it may have an important role to play in the diagnosis of LTBI and identification of children at true risk for TB...

..New anti-tuberculous agents are being developed and are greatly needed. There is mounting evidence that BCG has significant effectiveness in prevention, but development of improved vaccines for tuberculosis should remain a priority...

..The purpose of this study was to evaluate the usefulness of the QuantiFERON TB-2G (QFT), which is a novel method of detecting tuberculosis (TB) infection, in a case of TB outbreak...

..In patients awaiting liver transplantation, both the TST and QFT-G were comparable for the diagnosis of LTBI with reasonable concordance between tests. Indeterminate QFT-G result was more likely in those with more advanced liver disease...

..This K01 award will provide the epidemiological training and experience necessary to become a successful, independent public health investigator. ..

..However, it is imperative that the utility and interpretation of these tests be studied in HIV-infected children in settings with high burdens of TB and HIV. ..

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..These studies are expected to improve our understanding of the natural history and pathogenesis of HCV in immunosuppressed hosts. ..

..This will prepare trainees for success in future independent clinical research careers. ..

..Abstract not provided ..

..These investigations will define the role of HIV infection in progression of HCV disease and guide HCV treatment and prevention strategies for IDU. ..

..S. foreign born and the developing world. ..

..Thus, this proposal will support a promising young investigator who seeks to broaden his skill set as a clinician-scientist while determining how regulatory T cells weaken cellular immune responses against HIV. ..

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..This would be the first cohort of children affected by maternal HIV/AIDS followed all the way from early school age through late adolescence/early adulthood, allowing investigation of long-term outcomes of these children. ..

..CREB/ATF/AP-1 levels in T-cells of tuberculosis patients will be enhanced by viral expression vectors and nucleofection, and the effects on IFN-gamma production will be determined. ..

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..Few interventions, other than for prevention or medication adherence, are available for women living with HIV; this study will evaluate an intervention that will help HIV-positive mothers deal with a serious family issue. ..

..By achieving these specific aims, this study will provide valuable information on the effectiveness of hand sanitizers in the school setting. ..

..CREB/ATF/AP-1 levels in T-cells of tuberculosis patients will be enhanced by viral expression vectors and nucleofection, and the effects on IFN-gamma production will be determined. ..

..She will also complete coursework in the conduct of diabetes-related clinical research, addiction medicine, and the responsible conduct of research. ..

..Additionally, evaluation of children's long-term adjustment (mental health, behavioral, and social outcomes), will assist in detemining resiliency factors and risk factors for children who are orphaned by ADS. ..

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..My long-term goal is to work in an academic medical center as a physician scientist with a primary focus on the immunopathogenesis of HIV infection. ..

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..These studies may contribute to a more complete understanding of TB immunity in young children, and hence 'facilitate the development of an improved TB vaccine for this vulnerable population. ..

..aeruginosa and its clearance, and provide the basis for further consideration of novel therapeutic strategies to treat CF-related lung disease. ..

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..These studies may contribute to a more complete understanding of TB immunity in young children, and hence facilitate the development of an improved TB vaccine for this vulnerable population. ..

..These changes will be analyzed the context of granuloma structure and host response to infection. The University of Pittsburgh provides an ideal research environment to support this training program. ..