Treatment for latent TB in correctional facilities: a challenge for TB elimination

BACKGROUND: To eliminate tuberculosis (TB) in the United States, more information is needed on how to gain access to difficult-to-reach, high-risk populations to evaluate people who would benefit from treatment for latent TB infection (LTBI). METHODS: A field study was conducted of people at risk for co-infection with TB and the human immunodeficiency virus (HIV) and to demonstrate that treating LTBI in inmates is feasible. Inmates were tested for LTBI using the Mantoux tuberculin skin test (TST). Outcomes measured were skin test results and the start and completion of treatment for LTBI. RESULTS: In 49 correctional facilities in 12 states, 198102 inmates had a skin test read. The mean skin test positivity rate among inmates was 17.0%. Of those who had a known HIV test result, 14.5% tested HIV positive. Inmates with a positive TST were 4.2 times more likely than those with a negative TST to be HIV infected (95% confidence interval [CI]=3.9-4.4). Therapy for LTBI was completed in 55.9% of patients started on treatment. Patients who were HIV positive and started on a 12-month treatment regimen were less likely than HIV-negative patients (40.0% vs 68.1%, respectively) to complete treatment (odds ratio [OR]=0.24, 95% CI=0.20-0.28). Patients treated in jails were less likely than those treated in prisons (33.6% vs 57.7%, respectively) to complete treatment (OR=0.29, 95% CI=0.26-0.32). CONCLUSIONS: Correctional facilities offer a venue for identifying and treating high-risk individuals for LTBI. However, completing treatment is more problematic in jails than in prisons.     

Intensified Case-Finding for Latent Tuberculosis Infection Among the Baltimore City Hispanic Population

Foreign-born immigrants are at high risk for latent TB infection (LTBI). In conjunction with the Baltimore City Health Department (BCHD), student volunteers conducted intensified LTBI case-finding (ICF) using tuberculin skin testing (TST) in the Hispanic community from 2006–2010. We sought to determine the yield of ICF and estimate the LTBI prevalence. Retrospective cross-sectional study. Among 478 individuals screened, 164 (34.3 %) had a positive TST, 227 (47.5 %) had a negative TST, and 87 (18.2 %) did not return. Among those who completed screening, the prevalence of LTBI was 164/391 (41.9, 95 % CI 0.37–0.47). ICF referrals accounted for 4.4 % of all LTBI referrals to BCHD and for 41 % of referrals among Hispanics. We found a high rate of undiagnosed LTBI within the Hispanic community. This student-run ICF program accounted for almost half of all LTBI cases among Hispanics. Community resources are needed to target this high-risk population.     

Completion of screening for latent tuberculosis infection among immigrants

The objective of our study was to evaluate the sociodemographic factors associated with completion of screening for latent tuberculosis infection (LTBI) among undocumented immigrants in Brescia, Italy. Screening for LTBI was offered to 649 immigrants; 213 (33%) immigrants completed the first step of screening; only 44% (55/124) of individuals with a positive tuberculin skin test result started treatment for LTBI. The univariate analysis showed that being unmarried, of Senegalese nationality and being interviewed by a health-care worker with the same native language as the immigrant were significantly associated with completion of screening for LTBI. In the multiple logistic regression, being interviewed in the native language of the health-care worker (OR 2.5, 95% CI 1.3-4.8, P = 0.004) and being of Senegalese origin (OR 2.3, 95% CI 1.4-3.6, P = 0.0005) were independently associated with adherence to LTBI screening. Our results suggest that knowledge of the sociodemographic characteristics of immigrants, and the participation of health-care workers of the same cultural origin as the immigrant during the visits, can be an important tool to improve completion of screening for LTBI.     

静息心率与心血管病高危的关系

  目的   探讨江苏省居民静息心率（resting heart rate,RHR）与心血管病高危风险的关系,为心血管病防治提供科学依据。   方法   2015―2018年在江苏省6个项目点进行以社区人群为基础的心血管病高危人群筛查,共有95 210名初筛对象纳入本次研究,依据RHR测量值将初筛对象分为RHR < 68.5次/min、68.5~次/min、74~次/min、81~次/min和>90次/min共5组,采用非条件Logistic回归分析模型分析RHR与心血管病高危风险的关系。   结果   心血管病高危人群检出率为25.10%（23 897/95 348）。与RHR≤68.5次/min组相比,68.5~次/min组（OR=0.90,95% CI:0.86~0.94）心血管病高危风险降低,81~次/min组（OR=1.11,95% CI:1.06~1.17）、>90次/min组（OR=1.52,95% CI:1.43~1.61）心血管病高危风险增加。男性RHR>90次/min组心血管病高危风险的OR值为1.65,高于女性（OR=1.35）,35~45岁人群RHR>90次/min组心血管病高危风险的OR值最高,为2.03。   结论   江苏省35~75岁人群RHR过快（>90次/min）增加心血管病高危风险,男性及35~45岁人群风险更高。     

Assessment of tuberculosis treatment completion in an ethnically diverse population using two data sources. Implications for treatment interventions

Many adolescents who are prescribed therapy for tuberculosis (TB) infection fail to complete it. This article presents the results of a demographic and epidemiological assessment of TB treatment completion in adolescent populations using (a) surveillance data from the Los Angeles Health County Department and (b) a prospective/retrospective medical chart review from targeted clinics. Patients who did not complete the 6-month recommended medical treatment for latent tuberculosis therapy (LTBI) averaged 13 weeks in care. Younger age (OR = 1.15; 95% CI 1.03-1.29), birth in the United States (OR = 1.92; 95% CI 1.14-3.22, compared to Mexico), and Asian ethnicity were associated with completion of care. In multiple logistic regression analysis, age (OR = .88; 95% CI .78-.98) and Latino ethnicity (OR = .53; 95% CI .29-.95) remained significant predictors of completion of treatment. These findings indicate the need for age-specific educational reinforcement and cultural differentials in completing care for LTBI.     

上海市长宁区糖尿病高危人群筛查结果分析

目的 利用长宁区糖尿病高危人群的血糖筛查结果数据,分析长宁区糖尿病高危人群中糖尿病和糖调节受损的检出率,分析影响高危人群中糖尿病和糖调节受损的危险因素,为加强社区糖尿病防治力度提供参考依据。方法 收集糖尿病高危人群的基本信息、糖尿病危险因素及相关症状、体格检查数据及血糖数据进行统计分析。结果 2016 - 2017年,12 567名糖尿病高危人群中共检出糖尿病1 171人,糖调节受损者1 547人,检出率分别为9.3%、12.3%。多因素logistic回归分析发现,高龄（OR:1.032,95%CI:1.026～1.038）、男性（OR:1.161,95%CI:1.036～1.301）、低学历（P＜0.05）、糖调节受损史（OR: 6.257,95% CI:4.756～8.232）、亲属患2型糖尿病（OR: 1.388,95% CI:1.169～1.649）、高血压（OR: 1.463,95% CI:1.268～1.688）和体型超重/肥胖（OR: 2.228,95% CI: 1.940～2.559）是血糖代谢障碍的独立预测因素;高龄（OR:1.040,95% CI:1.035～1.045）、男性（OR:1.361,95% CI:1.224～1.581）、低学历（P＜0.05）、糖调节受损史（OR: 2.644,95% CI:1.949 ～3.586）、亲属患2型糖尿病（OR: 1.417,95% CI:1.217～1.650）、高血压（OR: 1.360,95% CI:1.199 ～1.543）、血脂异常（OR = 1.208,95% CI:1.019～1.432）、一过性类固醇糖尿病史（OR = 2.397, 95% CI:1.195～4.807)、长期静坐生活方式（OR = 2.542,95% CI:1.376～4.699）以及体型超重/肥胖（OR: 1.975,95% CI:1.754～2.224）是检出糖尿病的独立预测因素。结论 长宁区糖尿病高危人群的糖尿病和糖调节受损检出率较高。在高危人群中筛查,能使超过五分之一的血糖异常者得到早期诊断,应持续开展此项工作。     

Colorectal Cancer Screening Among Primary Care Patients: Does Risk Affect Screening Behavior?

Lifestyle factors including smoking, obesity, and diabetes can increase colorectal cancer (CRC) risk. Controversy exists regarding screening rates in individuals at increased CRC risk. To examine the effect of risk on CRC screening in primary care, cross-sectional data collected during January 2006–July 2007 from 720 participants in 24 New Jersey primary care practices were analyzed. Participants were stratified by risk: high (personal/family history of CRC, history of polyps, inflammatory bowel disease), increased (obesity, Type II diabetes, current/former smokers), and average. Outcomes were up-to-date with CRC screening, receiving a physician recommendation for screening, and recommendation adherence. Chi-square and generalized linear modeling were used to determine the effect of independent variables on risk group and risk group on outcomes. Thirty-seven percent of participants were high-risk, 46% increased-risk, and 17% average-risk. Age, race, insurance, education, and health status were related to risk. High-risk participants had increased odds of being up-to-date with screening (OR 3.14 95% CI 1.85–5.32) and adhering to physician recommendation (OR 7.18 95% CI 3.58–14.4) compared to average-risk. Increased-risk participants had 32% decreased odds of screening (OR 0.68, 95% CI 0.42–1.08). Low screening rates among increased-risk individuals highlight the need for screening interventions targeting these patients.     

Detecting Mycobacterium tuberculosis Infection in Children Migrating to Australia

In 2015, Australia updated premigration screening for tuberculosis (TB) disease in children 2–10 years of age to include testing for infection with Mycobacterium tuberculosis and enable detection of latent TB infection (LTBI). We analyzed TB screening results in children <15 years of age during November 2015–June 2017. We found 45,060 child applicants were tested with interferon-gamma release assay (IGRA) (57.7% of tests) or tuberculin skin test (TST) (42.3% of tests). A total of 21 cases of TB were diagnosed: 4 without IGRA or TST, 10 with positive IGRA or TST, and 7 with negative results. LTBI was detected in 3.3% (1,473/44,709) of children, for 30 applicants screened per LTBI case detected. LTBI-associated factors included increasing age, TB contact, origin from a higher TB prevalence region, and testing by TST. Detection of TB and LTBI benefit children, but the updated screening program’s effect on TB in Australia is likely to be limited.     

A statistical method was used for the meta-analysis of tests for latent TB in the absence of a gold standard,combining random-effect and latent-class methods to estimate test accuracy

ObjectiveBecause of the lack of a gold standard, the diagnostic performance of tests for the detection of latent tuberculosis infection (LTBI) is not known. However, statistical methods can be used to estimate the accuracy from the studies reporting the concordance among the tests.Study Design and SettingWe developed a random-effect latent-class model to estimate performance characteristics of three LTBI diagnostic tests: tuberculin skin test (TST, at 10-mm cutoff), QuantiFERON-TB gold (QFG), and TSPOT-TB from the studies evaluating agreement among the tests.ResultsNineteen studies were included. QFG had a sensitivity of 0.642 (95% confidence interval [CI]: 0.593–0.691) and specificity of 0.996 (95% CI: 0.989–1.000), TSPOT-TB had a sensitivity of 0.500 (95% CI: 0.334–0.666) and specificity of 0.906 (95% CI: 0.882–0.929), and TST had a sensitivity of 0.709 (95% CI: 0.658–0.761) and specificity of 0.683 (95% CI: 0.522–0.844). Results were not sensitive to the inclusion of any single study. When only the three studies that reported on TSPOT were removed, estimates for the other two tests varied minimally.ConclusionsStatistical methods can help estimate the accuracy of LTBI tests. Although the specificities were close to their reported values in the literature, the estimates for sensitivities were low; a finding that should be carefully evaluated.     

吉林省居民心血管病高危人群流行病学特征及其影响因素

  目的  了解吉林省居民心血管病高危人群流行病学特征,对心血管病相关影响因素进行分析,为全省心血管病防控策略提供参考依据。  方法  本研究于2017―2018年采用多阶段分层整群抽样的方法,选定吉林省6个项目地区,以社区或村为单位开展筛查。心血管病相关影响因素分析采用单因素、多因素Logistic回归分析模型,回归方法采用进入法,效应值用OR值及其95% CI值来表示。  结果  2017―2018年吉林省心血管病高危检出率为24.3%,标化后高危检出率为21.6%。其中,城市居民较农村居民具有较高的心血管病高危检出风险(OR=1.16, 95% CI:1.029~1.306, P=0.015);55~岁年龄组高危检出风险是35~岁年龄组的3.237倍(95% CI: 2.760~3.797, P < 0.001);高中和中专、大专及以上文化程度者更易成为心血管病高危人群(OR=1.499, 95% CI:1.283~1.753, P < 0.001; OR=1.539, 95% CI:1.240~1.910, P < 0.001);职业为行政人员者较农民更不易发展为心血管病高危人群(OR=0.656, 95% CI:0.502~0.858, P=0.002);10 000~、25 000~元家庭年收入水平者较 < 10 000元收入水平者易成为心血管病的高危人群;吸烟者、饮酒者心血管病高危检出风险是非吸烟者、非饮酒者的1.822、1.303倍(OR=1.822, 95% CI:1.617~2.053, P < 0.001; OR=1.303, 95% CI:1.090~1.559, P=0.004);随体重指数(body mass index, BMI)分级指数升高,心血管病的高危检出风险随之升高。  结论  应重点关注城市居民、高年龄组、文化程度较高者、中低等水平收入者、吸烟者、饮酒者、超重者、肥胖者,应重点加强对心血管病的一级预防及二级预防,降低心血管病发病率和所带来的疾病负担。     

A survey of latent tuberculosis infection among laboratory healthcare workers in New York City.

OBJECTIVE: To determine the prevalence of positive tuberculin skin tests (TSTs), incidence of TST conversion, risk factors for positive TSTs, and history of active TB among HCWs in microbiology laboratories in New York City. DESIGN: Two-year survey from May 1999 to June 2001. SETTING: Nineteen microbiology laboratories. RESULTS: During the first year, interviews were conducted with 345 laboratory HCWs (mean, 18 HCWs per site; range, 2 to 51) to assess the prevalence of positive TSTs, but 3 (1%) could not recall their result and were excluded from further analyses. The mean age of the remaining 342 HCWs was 48 years; 68% (n = 233) were female, 54% (n = 183) received bacille Calmette-Guerin (BCG) vaccination, and 71% (n = 244) were foreign born. The prevalence of a positive TST was 57% (n = 196), but only 20% (n = 39) of the HCWs received isoniazid. The incidence of TST conversion in the second year of the study was 1% (1 of 108). Multivariate analysis identified age (odds ratio [OR] per year, 1.05; 95% confidence interval [CI95], 1.02-1.08), foreign birth (OR, 3.80; CI95, 1.98-7.28), BCG immunization (OR, 4.89; CI95, 2.72-8.80), and employment in a mycobacteriology laboratory (OR, 2.14; CI95, 1.25-3.68) as risk factors for a positive TST. Only one HCW had been treated for active TB. CONCLUSIONS: The prevalence of positive TSTs was high among laboratory HCWs, but the TST conversion rate was low. Higher rates of treatment for latent TB infection are desirable.     

Latent Tuberculosis Infection Among Immigrant and Refugee Children Arriving in the United States: 2010

Immigrants and refugees age 2–14 years entering the United States from countries with estimated tuberculosis (TB) incidence rate ≥20 per 100,000 population are screened for TB. Children with TB disease are treated before US arrival. Children with positive tuberculin skin tests (TST), but negative TB evaluation during their pre-immigration examination, are classified with latent TB infection (LTBI) and are recommended for re-evaluation post-arrival. We examined post-immigration TB evaluation and therapy for children arriving with LTBI. We reviewed medical exam data from immigrant children with medical conditions and all refugee children arriving during 2010. Medical examination data were available for 67,334 children. Of these, 8231 (12 %) had LTBI pre-immigration; 5749 (70 %) were re-evaluated for TB post-immigration, and 64 % were retested by TST or IGRA. The pre-immigration LTBI diagnosis was changed for 38 % when retested by TST and for 71 % retested by IGRA. Estimated LTBI therapy initiation and completion rates were 68 and 12 %. In this population, testing with IGRA may limit the number of children targeted for therapy. Increased pre-immigration TB screening with post-immigration follow-up evaluation leading to completion of LTBI therapy should be encouraged to prevent TB reactivation.     

Prevalence and associated risk factors of latent tuberculosis infection among undergraduate and postgraduate dental students: A retrospective study

To estimate the prevalence of latent tuberculosis (TB) infection (LTBI) in Italian dental students exposed to the same occupational risks as dental health care personnel and to evaluate potential risk factors, a cross-sectional study was conducted on undergraduate and postgraduate students. After clinical evaluation, students were given a tuberculin skin test; in those found positive, an interferon-γ release assay (IGRA) was conducted. Of the 281 students enrolled, 10 were only TST positive; 8 were TST or/and IGRA positive. We found that participants testing positive at TST and/or IGRA, a group in which the risk of false LTBI positives is minimal, were older and had been studying longer. Although the prevalence of LTBI among dental students in our study was low, a risk of acquiring a work-related infection exists even in a country with a low incidence of TB. Thus, dental students should be screened to catch LTBI early on.     

Maternity care with the women's business service at the Mildura Aboriginal Health Service

OBJECTIVE: To assess and contrast views and experiences of women attending the Women's Business Service at the Mildura Aboriginal Health Service with those of rural women attending public maternity services who participated in a Victorian statewide survey conducted in 2000. METHODS: Face-to-face interviews were conducted with clients of the Women's Business Service (n=25) using a structured interview schedule based on the Victorian Survey of Recent Mothers 2000. Comparisons were made with rural women who had participated in the 2000 survey and had received public care for their pregnancy (n=333). RESULTS: Compared with rural participants in the 2000 survey, women who attended the Women's Business Service were significantly more likely to say care providers kept them informed (OR 20.63, 95% CI 3.27-853.75), midwives were never rushed during check-ups (OR 22.24, 95% CI 3.50-921.47), and to say they were happy with medical care (OR 5.79, 95% CI 1.68-30.67). Eighty per cent of interview participants described their antenatal care as 'very good'. Fewer women rated intrapartum care (64%) or postnatal hospital care (43%) as 'very good'. Compared with rural participants in the statewide survey, women attending the Women's Business Service were significantly more confident about looking after their baby in the first week at home (OR 9.08, 95% CI 2.95-37.01), and less likely to want additional help or advice (OR 0.21, 95% CI 0.04-0.73). CONCLUSIONS: Women using the Women's Business Service were significantly more positive about many aspects of their care than women attending other rural public maternity services. The study lends support to the view that Aboriginal community-controlled health services are well placed to provide appropriate and accessible care to Indigenous women.     

Primary health care for Aboriginal women and children in the year after birth: findings from a population‐based study in South Australia

Objective: To investigate the extent to which Aboriginal women access primary care for themselves and their infant in the year after childbirth. Method: Cross sectional population‐based survey of women giving birth to Aboriginal babies in South Australia between July 2011 and June 2013. Results: A total of 344 women took part in the study 4–9 months after giving birth. The majority had seen a primary health care practitioner since the birth: 86% had seen a Child and Family Health Service (CaFHS) nurse, 81% a general practitioner (GP), and 61% an Aboriginal health worker (AHW). Women living in remote areas were more likely to have seen primary care practitioners than women living in Adelaide (GP: OR 2.3, 95% CI 1.0–5.2; CaFHS: OR 2.4, 95% CI 1.0–5.8; AHW: OR 5.2, 95% CI 2.8–9.8). Around 16% of women with gestational diabetes and 10% with hypertension had not seen a GP since the birth, and 24% of women who had a low birthweight infant had not seen a CaFHS nurse. Conclusions: Despite high prevalence of maternal and infant morbidity, a sizeable minority of women did not access primary care practitioners postpartum. Implications for public health: Stronger efforts are needed to ensure Aboriginal women and families receive appropriate postnatal follow‐up.     

北京市昌平区某高校大学新生结核潜伏感染调查

目的 调查大学新生结核潜伏感染情况,以便采取预防性措施。 方法 2010年10月随机纳入北京市昌平区某高校入学新生TST≥10 mm的健康受试者420例,应用ELISPOT检测经抗原刺激后分泌IFN-γ的效应T淋巴细胞(即斑点形成细胞,SFCs)数量,并对ELISPOT阳性者进行为期3年的结核感染发病情况监测。 结果 ELISPOT检测LTBI总的阳性率为41.2%,在BCG接种(阳性率41.5%)和未接种(阳性率40.0%)中差异无统计学意义(χ²=0.064, P=0.447),在TST直径10~14、15~19和≥20 mm组间(37.6%、45.4%和64.3%)差异有统计学意义(χ²=8.408, P=0.015),173例未治疗的 ELISPOT+/TST+者经3年的ATB监测,发病率为0。 结论 北京市昌平区某高校大学新生LTBI比率高,但仅以ELISPOT和TST双阳性者为预防性治疗指标,尚不足够。     

Prevalence of Tuberculin Skin Test Positivity in Clinical Population in New York City

The prevalence of latent tuberculosis infection (LTBI) in the various populations of New York City (NYC), a city with a high density of non-US-born persons, is unknown. We examined the prevalence of TST positivity in patients who received a tuberculin skin test (TST) between 1/2002 and 8/2004 at any of 10 NYC health department chest centers. A positive TST was defined as an induration reaction to tuberculin of ≥10 mm. In the study population of 41,022 individuals, prevalence of TST positivity was 24.4% (95%CI = 24.0, 24.8); four times higher among non-US-born persons than US-born (39.5% vs. 8.8%, Prevalence ratio (PR) = 4.5; 95%CI = 4.4, 4.6). Prevalence of TST positivity increased with age in both US and non-US-born persons. Persons from countries with a TB case rate >100/100,000 population had higher prevalence of TST positivity (47% vs. ≤39%), even after controlling for BCG (PR = 1.3, 95%CI = 1.2, 1.4). These findings provide insight into current prevalence of TST positivity in many immigrant populations and will help both clinicians and health departments to target patients for LTBI treatment.     

Community-based cultural predictors of Pap smear screening in Nova Scotia

BACKGROUND: Pap smear screening is effective in reducing the incidence of cervical cancer. However, some subgroups of women are less likely to be screened than others. Since Canadian provincial health databases do not contain data fields identifying ethnicity or language, analyses employing these variables are typically not available. This paper overcomes this problem by using community- rather than person-based measures. Associations with having had a recent Pap smear are reported by community income, language, ethnic group, and urban/rural status, as well as the woman's age. METHODS: The provincial Health Card Number and Cytology Registries were linked to ascertain the screening status of women in mainland Nova Scotia and Cape Breton. Postal codes were linked to census enumeration areas and then to Statistics Canada census data to create community-based cultural measures for each woman. RESULTS: Women in mainland Nova Scotia were more likely to have had a recent Pap smear (Odds Ratio (OR)=1.36; 95% Confidence Interval (CI):1.33-1.39). Women living in low income (OR=1.19; CI:1.15-1.22), Aboriginal (OR=1.60; CI:1.46-1.76), mixed Black (OR=1.25; CI:1.19-1.30) and rural (OR=1.09; CI:1.07-1.11) communities and who were older were less likely to have had a recent Pap smear. DISCUSSION: These findings were not unexpected. In the United States and elsewhere, associations between Pap screening status and women with low income, rural residence, Aboriginal and Black heritage have been reported using person-based methods. Our findings demonstrate a method of providing measures of ethnicity and language that should be considered for use in Canadian studies of service utilization, disease status, and well-being.     

Incidence of TB in inmates with latent TB infection: 5-year follow-up

BACKGROUND: Inmates are a high-risk population for tuberculosis (TB) control efforts, including treatment for latent tuberculosis infection (LTBI). Completion of therapy after release has been poor. The goal of this study was to evaluate therapy completion and active disease over 5 years in a cohort of inmates. METHODS: The sample was from a completed randomized trial in 1998-1999 of education or incentive versus usual care to improve therapy completion after release from the San Francisco County Jail. Records from the jail, the County Tuberculosis Clinic, and the California TB Registry were used to measure therapy completion and development of active TB. Analyses were conducted in 2005. RESULTS: Of a total 527 inmates, 31.6% (n=176) completed therapy, of whom 59.7% (n=105) completed it in jail. Compared with the U.S.-born, foreign-born inmates residing in the United States for < or =5 years were less likely to complete the therapy (adjusted odds ratio [AOR]=0.49, 95% confidence interval [CI]=0.28-0.85), and those with more education were more likely to complete the therapy (AOR=1.06, 95% CI=1.01-1.12). Three subjects developed active TB in the 5 years of follow-up, resulting in an annual rate of 108 per 100,000. Compared with California rates, subjects were 59 times as likely to develop active TB (standardized morbidity ratio of 59.2, 95% CI=11.2-145.1). None had completed therapy, none were new immigrants, and two were known to be HIV-positive at diagnosis. CONCLUSIONS: Completion of therapy for LTBI is a challenge, but the active TB seen in this jail cohort emphasizes the importance of continued efforts to address TB risk in this population.     

Screening for tuberculosis infection using whole-blood interferon-gamma and Mantoux testing among Japanese healthcare workers.

OBJECTIVE: To examine the hypothesis that results of the QuantiFERON-TB Gold assay (QFT-G), a whole-blood test for detection of tuberculosis infection, are more significantly related to known risk factors for tuberculosis infection in healthcare workers (HCWs) who have received bacille Calmette-Guerin vaccine than are results of the Mantoux tuberculin skin test (TST). DESIGN: All HCWs (approximately 510) from a 370-bed general hospital in Tokyo where patients with and patients without tuberculosis are treated were invited to participate in the study. All study participants completed a questionnaire about their Mycobacterium tuberculosis infection risk factors as HCWs at the general hospital. They were then tested for LTBI by means of the QFT-G, followed by the TST. Statistical analyses were performed to compare results of each test with M. tuberculosis infection risk factors (age, length of employment in the healthcare industry, history of working with tuberculosis-positive patients in a tuberculosis ward or in the outpatient department of the hospital's tuberculosis clinic for more than 1 year, chest radiograph evidence of healed tuberculosis, history of performing bronchoscope procedures, and job classification), and for TST-positive HCWs, to compare the QFT-G result with the TST induration diameter. RESULTS: A total of 332 HCWs (95% of whom had been vaccinated with BCG) participated in the study, and 33 had positive QFT-G results, suggesting a prevalence of LTBI of 9.9%. Of 304 HCWs who underwent TST, 283 (93.1%) had an induration diameter of 10 mm or more. Multiple logistic regression analysis revealed that positive QFT-G results were significantly associated with age and with a history of working in a tuberculosis ward or an outpatient department of a tuberculosis clinic. TST results were not correlated with any of the tuberculosis infection risk factors we evaluated. CONCLUSIONS: Positive QFT-G results were closely associated with the presence of risk factors for LTBI in a hospital setting, suggesting that the QFT-G can detect LTBI in a population composed predominantly of BCG vaccinees. Because most HCWs worldwide have been vaccinated with BCG, the QFT-G offers a significant improvement over the TST in tuberculosis screening programs and minimizes unwarranted use of tuberculosis prophylaxis.