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ObjectiveTo investigate the latent tuberculosis infection （LTBI） of close contacts in schools of Xuhui District， and to explore the tuberculin skin test （TST）- interferon-γ release assay （IGRA） two-step method in order to discover the screening strategy of tuberculosis in Xuhui District. MethodsClose contacts of tuberculosis in schools of Xuhui District from 2020 to 2022 were selected as research subjects. Screening was conducted using symptom questionnaire， TST， chest X-rays， IGRA， and the information including the etiological results and grade of the index cases， as well as gender， age， and relationship with the index cases of the research subjects were collected. ResultsTotally 615 close contacts of 32 tuberculosis cases occurred in the schools were finally included. Of the 609 close contacts who completed tuberculosis infection screening and underwent TST testing， 153 TST（+） individuals underwent IGRA testing. The final LTBI rate was 4.6%， and the pulmonary tuberculosis detection rate was 163 per 100 000. The relationship with the index cases was an influencing factor for LTBI. The IGRA positivity rate was higher among close contacts with TST ≥15 mm than among those with 10 mm≤ TST <15 mm （χ2=14.41， P<0.05）. ConclusionThe latent tuberculosis infection among close contacts of school tuberculosis cases in Xuhui District remains serious. TST-IGRA two-step method can assist in the accurate diagnosis of LTBI and pulmonary tuberculosis cases.
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A quarter of the world's population is infected with Mycobacterium tuberculosis (M.tb), 10% of cases develop active tuberculosis (TB), and 90% have a latent TB infection. Family members of TB patients have the highest potential for latent TB infection. This study aims to identify latent TB infection and risk factors in family members within the household contacts of active TB patients. This study used a crosssectional study design with a contact tracing method. The selected subjects were 138 people from 241 total family members of 112 active TB patients. Subjects underwent a tuberculin skin test (TST), using 2 units of tuberculin (TU) purified protein derivative (PPD) 0.1 mL (PT. Bio Farma Persero, Bandung, Indonesia). Data risk factors were collected during home visits. Data were analyzed using the chi-square test and multiple logistic regression. A total of 63.8% (88/138) of family members of active TB patients' household contacts had latent TB infection. The type of occupation of laborers/ farmers/fishers is the most dominant risk factor associated with latent TB infection (AOR: 7.04; 95% CI: 1.7029.02), followed by unqualified bedroom density (<8 m2/2 people) (AOR: 5.33; 95% CI: 2.44 12.71) and contact duration ≥5 hours/day (AOR: 4.70; 95% CI:1.3316.66). Latent TB infection in family members of active TB patients' household contacts was quite high. Occupation type, contact duration, and bedroom density were simultaneously confirmed as the main risk factors related to latent TB infection. Therefore, it is recommended to identify and prevent latent TB infection in family members in household contact with active TB patients.
Subject(s)
Humans , Family Characteristics , Latent Tuberculosis , Skin Tests , Tuberculin Test , Contact Inhibition , InfectionsABSTRACT
@#Abstract: Objective This paper aims to explore the effect of live attenuated varicella vaccine on the sensitivity of tuberculin skin test(TST), and to provide reference for tuberculin skin test in the future. Methods TST and emergency varicella vaccine were administered to students in grade one of a high school in Wuxi, Jiangsu province, who had both TB and varicella cases. Independent-samples t test was used to analyze the mean diameter of induration of TST in day 0, day 83 and day 195. The retrospective cohort study was used to analyze the effect of live attenuated varicella vaccine on TST. Results The mean induration diameter of 45 students who participated in three TST tests on day 0, day 83 and day 195 were analyzed by independent sample t test. On day 0, there was a difference in the mean diameter of TST induration between the unvaccinated and vaccinated groups(1.630±2.837 vs 5.818±4.530) (t=-3.692, P=0.001). On day 83, there was no difference in the mean diameter of TST induration between the two groups(0.001±0.001 vs 0.114±0.533) (t=-1.000, P=0.329). On day 195, there was a difference in the mean diameter of TST induration between the two groups(1.913±3.774 vs 5.023±5.126) (t=-2.309, P=0.026). Moreover, the retrospective cohort study showed that the mean diameter of TST induration changed more significantly after inoculation with varicella vaccine, RR=6.071, 95%CI (1.667-22.116), P<0.05; After inoculation with varicella vaccine, the mean diameter of TST test did not change significantly from day 0 to day 195 with no statistical significance RR=3.474, 95%CI (0.333-36.240), P>0.05. Conclusions Live attenuated varicella vaccine may temporarily affect the sensitivity of tuberculin skin test.
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Objective:To investigate five kinds of tuberculin skin test (TST), tubercle bacillus-antibody(TB-Ab), interferon-γ release assay(IGRA), tubercle bacillus-DNA (TB-DNA) and collection of bacterial centrifugal smears methods, the application value of combined detection in improving the diagnostic efficiency of pneumoconiosis complicated with tuberculosis.Methods:A total of 150 eligible patients with pneumoconiosis from January 2018 to January 2019 in Zhangjiakou Pulmonary Hospital were selected as the research subjects, and all of them underwent TST, TB-Ab, IGRA, TB-DNA and bacterial centrifugal smear detection. Compared the positive rates of five detection methods in pneumoconiosis and its different stages, and compare the proportion of tuberculosis infection and tuberculosis in different stages of pneumoconiosis.Results:Among the 150 patients with pneumoconiosis, 41 cases (27.33%) were with pneumoconiosis complicated with tuberculosis infection, 24 cases (16.00%) with pneumoconiosis complicated with clinically diagnosed pulmonary tuberculosis, 21 cases (14.00%) with pneumoconiosis complicated with confirmed pulmonary tuberculosis, and 45 cases (30.00%) with pneumoconiosis complicated with pulmonary tuberculosis; with the improvement of pneumoconiosis stage, the proportion of pneumoconiosis combined with tuberculosis infection and pulmonary tuberculosis increased significantly ( P<0.05). Compared with TB-Ab, TB-loop-mediated isothermal amplification(LAMP), and interlayered cup collection centrifuge smear method, the overall positive rate of IGRA detection and pneumoconiosis stage Ⅲ were higher ( P<0.05), but there was no significant difference compared with TST detection ( P>0.05). The positive rate of combined detection was higher, but there was no significant difference compared with IGRA detection ( P>0.05). With the increase of pneumoconiosis stage, the positive reaction intensity of TST decreased, and the positive value of TB-Ab and IGRA increased. Conclusions:The combined detection of TST, TB-Ab, IGRA, TB-DNA and bacterial centrifugal smear method can significantly improve the diagnostic efficiency of pneumoconiosis combined with tuberculosis.
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Background: India has one of the highest TB burden globally. Children contribute a significant proportion of TB burden, in whom the diagnosis can be challenging because many childhood diseases mimic TB. Therefore, a high index of suspicion is required for early diagnosis of childhood tuberculosis to prevent poor outcome. Objectives was to evaluate the prevalence and profile of childhood tuberculosis cases and to determine the risk factorsMethods: An observational cross-sectional study was conducted over a period of 6 months at a hospital in north India and the prevalence and profile of the children admitted with the clinical suspicion of tuberculosis was studied. Case specific diagnostic approach was used for diagnosis and the appropriate treatment was instituted.Results: The prevalence of childhood TB was 2.3% among hospitalized children. Of these, 66.5% were males and 33.49% were females. The majority of cases were more than 8 years. The history of contact was present only in 31.1%. Tuberculin skin test was positive in 53.11%. Pulmonary tuberculosis was the most common type of childhood tuberculosis (45.45%) followed by neurological tuberculosis (42.8%), abdominal tuberculosis (6.45%), tuberculous lymphadenitis (2.63%), others (2.61%). Malnutrition was a potent contributing factor present in 91.86%. The mortality rate observed in the study was 9.56%.Conclusions: Owing to the high burden of tuberculosis among pediatric population in India, there is an alarming need to develop more economical and advanced diagnostic methods for better patient management and above all there is urgent need of the hour to educate the masses about the transmission and risk factors for this disease.
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OBJECTIVES: To retrospectively evaluate the performance and distinctive pattern of latent tuberculosis (TB) infection (LTBI) screening and treatment in patients with ankylosing spondylitis (AS) and psoriatic arthritis (PsA) under anti-tumor necrosis factor (TNF) therapy and determine the relevance of re-exposure and other risk factors for TB development. METHODS: A total of 135 and 83 patients with AS and PsA, respectively, were evaluated for LTBI treatment before receiving anti-TNF drugs via the tuberculin skin test (TST), chest radiography, and TB exposure history assessment. All subjects were evaluated for TB infection at 3-month intervals. RESULTS: The patients with AS were more often treated for LTBI than were those with PsA (42% versus 30%, p=0.043). The former also presented a higher frequency of TST positivity (93% versus 64%, p=0.002), although they had a lower frequency of exposure history (18% versus 52%, p=0.027) and previous TB (0.7% versus 6%, p=0.03). During follow-up [median, 5.8 years; interquartile range (1QR), 2.2-9.0 years], 11/218 (5%) patients developed active TB (AS, n=7; PsA, n=4). TB re-exposure was the main cause in seven patients (64%) after 12 months of therapy (median, 21.9 months; IQR, 14.2-42.8 months) and five LTBI-negative patients. TB was identified within the first year in four patients (36.3%) (median, 5.3 months; IQR, 1.2-8.8 months), two of whom were LTBI-positive. There was no difference in the TB-free survival according to the anti-TNF drug type/class; neither synthetic drug nor prednisone use was related to TB occurrence (p>0.05). CONCLUSION: Known re-exposure is the most critical factor for incident TB cases in spondyloarthritis. There are also some distinct features in AS and PsA LTBI screening, considering the higher frequency of LTBI and TST positivities in patients with AS. Annual risk reassessment taking into consideration these peculiar features and including the TST should be recommended for patients in endemic countries.
Subject(s)
Humans , Spondylitis, Ankylosing/drug therapy , Arthritis, Psoriatic/diagnosis , Arthritis, Psoriatic/drug therapy , Arthritis, Psoriatic/epidemiology , Latent Tuberculosis/diagnosis , Latent Tuberculosis/epidemiology , Spondylitis, Ankylosing/epidemiology , Retrospective Studies , Follow-Up Studies , Tumor Necrosis Factor Inhibitors/therapeutic useABSTRACT
To evaluate the performance of interferon gamma release assays and tuberculin skin test in Bacillus Calmette-Guerin vaccinated young children. Methods: A cross-sectional study was conducted in healthy children younger than 5 years who were recently diagnosed with tuberculosis or had recent exposure to active tuberculosis. QuantiFERON-TB Gold, T-SPOT.TB and tuberculin skin test were performed in each patient. Results: Of the 60 children, median age 3.3 years, 17 had tuberculosis and 43 had recent tuberculosis exposure. Overall, 15 (25.0%) children had tuberculin skin test reaction =10 mm; 8 (13.3%) were positive by QuantiFERON-TB Gold In-Tube test, and 12 (20.0%) by T-SPOT.TB. Nineteen (31.7%) children had at least one positive test. There was a moderate agreement between interferon gamma release assays and tuberculin skin test. Conclusions: The positive rates of interferon gamma release assays and tuberculin skin test were low in young children who were infected with tuberculosis, supporting the management strategy of not testing children younger than 5 years. (IGRA) do not react to BCG and most NTM[2], are preferred to TST in older children and adults[3], but may be less reactive in young children with immature T-cell function. Due to the limited knowledge of IGRA in BCG-vaccinated young children, we evaluated the performance and correlation of IGRA tests and TST in young children in a high TB burden setting who received BCG vaccination at birth and recently diagnosed with LTBI, or with active TB.
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To evaluate the performance of interferon gamma release assays and tuberculin skin test in Bacillus Calmette-Guerin vaccinated young children. Methods: A cross-sectional study was conducted in healthy children younger than 5 years who were recently diagnosed with tuberculosis or had recent exposure to active tuberculosis. QuantiFERON-TB Gold, T-SPOT.TB and tuberculin skin test were performed in each patient. Results: Of the 60 children, median age 3.3 years, 17 had tuberculosis and 43 had recent tuberculosis exposure. Overall, 15 (25.0%) children had tuberculin skin test reaction =10 mm; 8 (13.3%) were positive by QuantiFERON-TB Gold In-Tube test, and 12 (20.0%) by T-SPOT.TB. Nineteen (31.7%) children had at least one positive test. There was a moderate agreement between interferon gamma release assays and tuberculin skin test. Conclusions: The positive rates of interferon gamma release assays and tuberculin skin test were low in young children who were infected with tuberculosis, supporting the management strategy of not testing children younger than 5 years. (IGRA) do not react to BCG and most NTM[2], are preferred to TST in older children and adults[3], but may be less reactive in young children with immature T-cell function. Due to the limited knowledge of IGRA in BCG-vaccinated young children, we evaluated the performance and correlation of IGRA tests and TST in young children in a high TB burden setting who received BCG vaccination at birth and recently diagnosed with LTBI, or with active TB.
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Introduction: Registries of spondyloarthritis (SpA) patients' follow-up provided evidence that tumor necrosis factor inhibitors (TNFi) increase the incidence of active tuberculosis infection (TB). However, most of these registries are from low burden TB areas. Few studies evaluated the safety of biologic agents in TB endemic areas. This study compares the TB incidence rate (TB IR) in anti-TNF-naïve and anti-TNF-experienced subjects with SpA in a high TB incidence setting.Methods: In this retrospective cohort study, medical records from patients attending a SpA clinic during 13 years (2004 to 2016) in a university hospital were reviewed. The TB IR was calculated and expressed as number of events per 105 patients/year; the incidence rate ratio (IRR) associated with the use of TNFi was calculated.Results: A total of 277 patients, 173 anti-TNF-naïve and 104 anti-TNF-experienced subjects, were evaluated; 35.7% (N = 35) of patients who were prescribed an anti-TNF drug were diagnosed with latent tuberculosis infection (LTBI). Total follow-up time (person-years) was 1667.8 for anti-TNF-naïve and 394.9 for anti-TNF-experienced patients. TB IR (95% CI) was 299.8 (37.4-562.2) for anti-TNF naïve and 1012.9 (25.3-2000.5) for anti-TNF experienced subjects. The IRR associated with the use of TNFi was 10.4 (2.3- 47.9).Conclusions: In this high TB incidence setting, SpA patients exposed to anti-TNF therapy had a higher incidence of TB compared to anti-TNF-naïve subjects, although the TB incidence in the control group was significant.(AU)
Subject(s)
Humans , Male , Female , Adult , Middle Aged , Aged , Tuberculosis/chemically induced , Tuberculosis/epidemiology , Biological Products/adverse effects , Antirheumatic Agents/adverse effects , Spondylarthritis/drug therapy , Tumor Necrosis Factor Inhibitors/adverse effects , Spondylitis, Ankylosing/drug therapy , Biological Products/therapeutic use , Arthritis, Psoriatic/drug therapy , Incidence , Retrospective Studies , Follow-Up Studies , Antirheumatic Agents/therapeutic use , Endemic Diseases , Latent Tuberculosis/drug therapy , Tumor Necrosis Factor Inhibitors/therapeutic useABSTRACT
This prospective cohort study was conducted to compare the accuracy of QuantiFERON®-TB (QFT) Gold In-Tube test and tuberculin skin test (TST) in diagnosing tuberculosis (TB) in predominantly bacille Calmette–Guerin-vaccinated children with a high incidence of malnutrition. The sensitivity of the QFT versus the TST was 69.6% versus 52.9% for WHO-defined TB, with specificity of 86% versus 78.3%, respectively. The concordance of the TST and QFT was 79% overall (? = 0.430), 62.5% in those with WHO-defined TB and 85.7% in those without TB. Majority of the QFT+/TST ? discordance was seen in children with TB, whereas majority of the TST+/QFT ? discordance was seen in those without TB. The TST was more likely to be negative in children with moderate-to-severe malnutrition (P = 0.003) compared to the QFT, which was more likely to be positive in younger children. The significantly better performance of the QFT in malnourished children and those at younger ages supports its use for TB diagnosis in these subpopulations.
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Background: Tuberculosis (TB) and malnutrition are important causes of morbidity and mortality in' children, in developing countries. Tuberculosis' can be a' cause of' malnutrition in children and also a common cause of pneumonia' in such malnourished children. In the present study ,our aim is to know the' prevalence and early clinical diagnosis of symptomatic not confirmed TB, in recent challenging environment,' in protein energy malnutrition' children, this information would certainly help clinicians in early detection, diagnosis and management of PTB (Pulmonary Tuberculosis) in such populations ,to reduce morbidity and mortality.Methods: We prospectively investigated protein energy malnutrition children, with clinical features of tuberculosis, between 5 to 15 years of age , admitted during 18 months of study period. Clinical and demographic data' of studied children were collected. Anthropometric (Height and Weight) measurement and physical examination were made. PEM (Protein energy malnutrition) children were classified according to Indian academy of pediatric classification. History of BCG vaccination and exposure to contact were inquired. Chest radiography was done for all' children in our study.Results: A total of 150 protein energy malnutrition children, between 5 to 15 years, admitted over 18 months' period were' studied. Majority of children were female as compared to male and under 5 to 10 years of age. Out of these, symptomatic not confirmed pulmonary TB 93 (62%) and Extra pulmonary TB 18 (12%) and Non TB cases were 39 (26%). According to Grade of PEM, symptomatic not confirmed pulmonary TB cases under grade III were 45 (48.5%) and 35 (37.6%) were under grade II .Conclusions: Pulmonary tuberculosis may be a common cause of pneumonia in malnourished children and' the cause of death in these population. So' Its frequency and early clinical detection ,even without microbiological confirmation and supportive evidence and treatment guideline should be made by more further study. So that, it' will help clinicians to treat these population to reduce morbidity and mortality.
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In view of the high burden of latency of tuberculosis (TB) in India, tackling latent TB in the right way is a menace. All latent TB’s infection (LTBI) are treated in countries having low burden such as the United States. However, this approach cannot be implemented in high burden countries like India until concrete evidence or consensus by experts on this subject is made. There are very specific risk groups where these patients are to be treated as far as current evidence-based medicine is concerned. Hence, the need to develop a document was felt, through which the treatment of LTBI becomes homogeneous by each and every physician who is practicing and treating TB. The last attempt to review the topic was made in 2015, after which there have been many changes and update in this subject.
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Background: Diagnosing tuberculosis (TB) was still a worldwide big challenge in cases with negative reports of Xpert MTB/RIF, smear, and culture test of acid-fast bacilli (AFB). A single, direct Xpert MTB/RIF test identified 98.2% of the sputum smearpositive TB cases and 72.5% of those with sputum smear-negative TB. Such a diagnosis was often made based on the clinicalcriteria and other supportive findings like tuberculin skin test (TST).Objective: Hence, this study was to help in the diagnosis and treatment of clinically diagnosed childhood TB, especially in thelimited resource rural areas and developing countries.Materials and Methods: Based on the WHO revised criteria of TB diagnosis, to include clinically diagnosed TB instead ofsmear-negative TB disease, an operational definition of clinically diagnosed TB for the selection of participants for TST wasestablished for this study. Based on the recommendation of the CDC team at the Saskatchewan Lung Association, 2007-03-21at the Wayback Machine, the TST results of the study were interpreted.Results: Hence, in our study, the sensitivity of TST was 82.35% (≥10 mm) in the age group of 1–4 years and 60.16% (≥15 mm)in the age group of >4–12 years. However, this study shows that the positivity rate of TST was increased from 60.16% (≥15 mm)to 86.15% (≥10 mm), if the TST results≥10 mm were interpreted as positive even in this age group of >4 years–12 years.Conclusion: In such very difficult situations of clinically diagnosed TB, this study observed that empiric anti-TB treatment may bestarted without microbiological confirmation to clinically diagnosed childhood TB patient with negative reports of Xpert MTB/RIF,smear, and culture test of AFB, presented with one or more of the following symptoms and signs of clinically diagnosed childhoodTB: (1) Chronic anorexia, (2) ill health and fatigue, (3) weight loss of >5% during the past 3 months or documented failure to striveduring the preceding 3 months, (4) night sweating and persistent fever >2 weeks, and (5) non-remitting cough >2 weeks but cannot bediagnosed clinically by any possible causes than TB, and positive TST report, in resource-limited rural areas anddeveloping countries.
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ABSTRACT Most people infected by Mycobacterium tuberculosis (Mtb) do not have any signs or disease symptoms, a condition known as latent tuberculosis infection (LTBI). The introduction of biological agents, mainly tumor necrosis factor (TNF) inhibitors, for the treatment of immune-mediated diseases such as Rheumatoid Arthritis (RA) and other rheumatic diseases, increased the risk of reactivation of LTBI, leading to development of active TB. Thus, this review will approach the aspects related to LTBI in patients with rheumatologic diseases, especially those using iTNF drugs. For this purpose it will be considered the definition and prevalence of LTBI, mechanisms associated with diseases and medications in use, criteria for screening, diagnosis and treatment. Considering that reactivation of LTBI accounts for a large proportion of the incidence of active TB, adequate diagnosis and treatment are crucial, especially in high-risk groups such as patients with rheumatologic diseases.
RESUMO A maioria das pessoas infectadas por Mycobacterium tuberculosis (Mtb) não possui sinais ou sintomas da doença, quadro conhecido como infecção latente por tuberculose (ILTB). A introdução de agentes biológicos, sobretudo inibidores do fator de necrose tumoral (iTNF), para o tratamento de doenças imunomediadas, como artrite reumatoide (AR) e outras doenças reumatológicas, aumentou o risco de reativação de ILTB, levando ao desenvolvimento de tuberculose (TB) ativa. Assim, esta revisão abordará os aspectos relacionados à ILTB em pacientes com doenças reumatológicas, especialmente naqueles em uso de medicamentos iTNF. Para tanto, serão considerados a definição e a prevalência de ILTB, os mecanismos associados às doenças e às medicações em uso, bem como os critérios para rastreamento, diagnóstico e tratamento da ILTB. Como a reativação da ILTB é responsável pela grande proporção de casos de TB ativa, o diagnóstico e o tratamento adequados são cruciais, principalmente em grupos de alto risco, como os pacientes com doenças reumatológicas.
Subject(s)
Humans , Rheumatic Diseases/complications , Rheumatic Diseases/drug therapy , Tumor Necrosis Factor-alpha/antagonists & inhibitors , Latent Tuberculosis/etiology , Tuberculin Test , Risk Factors , Antirheumatic Agents/adverse effects , Latent Tuberculosis/diagnosis , Latent Tuberculosis/drug therapy , Interferon-gamma Release TestsABSTRACT
In order to eliminate tuberculosis worldwide by 2050, effective management of latent tuberculosis infection is essential, and policy-makers have begun to recognize the importance of scaling up preventive therapy. The current guideline recommends targeted latent tuberculosis infection testing that identifies high-risk groups based on risk stratification for progression from latent infection to active disease. Both the tuberculin skin test and interferon-gamma releasing assay have a similar diagnostic efficacy for predicting progression to active tuberculosis. The Korean guideline recommends 9-month isoniazid monotherapy as the standard treatment; however, more evidence supports that short course rifampicin-based regimen is both more effective and tolerable than isoniazid monotherapy.
Subject(s)
Diagnosis , Interferon-gamma , Interferon-gamma Release Tests , Isoniazid , Latent Tuberculosis , Skin Tests , Tuberculin , TuberculosisABSTRACT
BACKGROUND: Latent tuberculosis infection is a condition where there is a persistent immune response to Mycobacterium tuberculosis without clinical manifestations of tuberculosis. Currently, there is no gold standard to diagnose latent tuberculosis infection. The tuberculin skin test and interferon-gamma release assay are currently used to diagnose latent tuberculosis infection. However, studies have shown inconsistencies regarding the level of agreement between these tests in different settings. In this study, we aimed to evaluate the agreement between these two tests for diagnosing latent tuberculosis infection in human immunodeficiency virus (HIV)-infected individuals. METHODS: We screened HIV patients with no clinical symptoms of tuberculosis, a normal chest X-ray, and no history of tuberculosis or use of antituberculous drugs. Participants were tested with tuberculin skin test (TST) and T-SPOT.TB (an interferon gamma release assay) simultaneously. Participants' HIV stage was determined by measuring the level of CD4+ T-lymphocytes. Tuberculosis status was confirmed by sputum examination using GeneXpert. The level of agreement between the TST and T-SPOT.TB results was measured using Cohen's κ coefficient. RESULTS: Of the 112 participants, 20 had a positive T-SPOT.TB test result, and 21 had a positive TST result. The TST and T-SPOT.TB test results showed a high level of agreement (κ = 0.648, P < 0.001). Performance of the tests did not vary with CD4+ level. However, in participants with CD4+ < 200 cells/mm³, T-SPOT.TB detected more latent tuberculosis infections than the TST. CONCLUSION: There was good agreement between the TST and T-SPOT.TB results of latent tuberculosis infection in participants. TST is the preferred test for diagnosing latent tuberculosis infection in HIV-infected patients, especially in resource-limited settings, because it is simple and cost-effective. However, T-SPOT.TB may be useful to rule out latent tuberculosis infection in patients with severe immunodeficiency.
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Humans , HIV , Indonesia , Interferon-gamma Release Tests , Interferons , Latent Tuberculosis , Mycobacterium tuberculosis , Skin Tests , Skin , Sputum , T-Lymphocytes , Thorax , Tuberculin , TuberculosisABSTRACT
Abstract 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. A series of tests - intravenous tuberculin test, ophthalmic test, palpebral test, "ZhAT" test, showed that most of the tuberculosis changes in cattle were found in regional lymph nodes more often than in internal organs. In healthy for tuberculosis cows, at the age of 4-9 years, seasonal nonspecific sensitivity to tuberculin is observed. Implementation of the developed express method of glutaraldehyde test on farms in healthy tuberculosis will speed up the diagnosis of tuberculosis and mycobacteriosis in animals that reacted to tuberculin and will exclude short-term nonspecific sensitization of their organism to tuberculin. The introduction of this methodology can be used to diagnose and clearly differentiate the diagnoses of "tuberculosis" and "mycobacteriosis" in cattle. This will cure part of the livestock and reduce the amount of slaughter.
Subject(s)
Animals , Cattle , Diagnostic Tests, Routine/methods , Tuberculosis, Bovine/diagnosis , Sensitivity and Specificity , Tuberculin Test/methodsABSTRACT
@#Latent TB infection (LTBI) is defined as a state of persistent immune response to stimulation by M. tuberculosis antigens without evidence of clinically manifested active TB. Current methods for LTBI detection are the tuberculin skin test (TST) and the interferon-gamma release assays (IGRAs). Both these tests indicate prior host immunosensitisation to M. tuberculosis antigens and do not provide information regarding viability of the organism within the host. Around 10 percent of immunocompetent adults with LTBI develop active TB in their lifetime: of these, approximately half (i.e. 5%) develop disease within 2 to 5 years of acquiring the infection. The risk of progression of LTBI to active TB disease is increased in HIV/AIDs, in very young children, and in persons with solid and haematological transplant, end-stage renal failure on haemodialysis, silicosis, head and neck malignancies, and diabetes. Isoniazid preventive therapy has been shown to reduce the risk of developing active TB by 60–90 percent. However, it is associated with a risk of hepatoxicity, which increases with age. It is recommended that LTBI testing be targeted at groups/persons with a high risk of progression to active disease (e.g. close contacts, those with HIV infection) and/or for whom the benefit of PT outweighs the risk of hepatotoxicity.
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PURPOSE: This study aimed to describe the results of a contact investigation on health care workers after exposure to a house officer with smear-positive pulmonary tuberculosis (TB). METHODS: Eighty nine out of 101 subjects who had close contact with the index patient agreed to be enrolled in the investigation. The first contact investigation was conducted approximately 30 days after the index patient's onset of symptoms, followed by the second investigation after 10 weeks. In both, clinical manifestations were studied, and chest X-ray and tuberculin skin test (TST)/QuantiFERON-TB Gold (QFT-G) in dual screening strategy were conducted. RESULTS: The first TST resulted in positive in 34 subjects (38.2%). QFT-G was conducted on 16 subjects who tested positive in the first TST and aged under 36. Six of them (37.5%) were positive. The second TST was conducted on 41 subjects with negative results in the first TST. Seventeen (41.5%) were positive and among them, three (17.6%) showed positive QFT-G. None of the subjects were diagnosed with active TB. The probability of TB infection through contact with the index patient was 7.3% (3/41) in dual screening strategy while it was 41.5% (17/41) in TST strategy. CONCLUSIONS: This first hospital-setting contact investigation for tuberculosis in Korea revealed that latent tuberculosis infection (LTBI) rates vary depending on different diagnostic strategies. This indicates the need for systematic guidelines for diagnosing LTBI in health care workers who have professional exposure to TB.
Subject(s)
Humans , Delivery of Health Care , Interferon-gamma Release Tests , Korea , Latent Tuberculosis , Mass Screening , Skin Tests , Thorax , Tuberculin , Tuberculosis , Tuberculosis, PulmonaryABSTRACT
OBJECTIVES: The tuberculin skin test (TST) and the QuantiFERON-TB Gold test (QFT) are used to identify latent tuberculosis infections (LTBIs). The aim of this study was to determine the agreement between these two tests among health care workers in Iran. METHODS: This cross-sectional study included 177 tuberculosis (TB) laboratory staff and 67 non-TB staff. TST indurations of 10 mm or more were considered positive. The Student's t-test and the chi-square test were used to compare the mean score and proportion of variables between the TB laboratory staff and the non-TB laboratory staff. Kappa statistics were used to evaluate the agreement between these tests, and logistic regression was used to assess the risk factors associated with positive results for each test. RESULTS: The prevalence of LTBIs according to both the QFT and the TST was 17% (95% confidence interval [CI], 12% to 21%) and 16% (95% CI, 11% to 21%), respectively. The agreement between the QFT and the TST was 77.46%, with a kappa of 0.19 (95% CI, 0.04 to 0.34). CONCLUSIONS: Although the prevalence of LTBI based on the QFT and the TST was not significantly different, the kappa statistic was low between these two tests for the detection of LTBIs.