目的:探讨体外 γ-干扰素释放试验( IGRA )在儿童结核病密切接触者结核病筛查的可行性.方法:对我院儿科门诊就诊 185 例儿童结核病密切接触者采用 IGRA 检测,对其与结核病诊断相关性进行分析. 结果:IGRA 阳性组中,儿童结核病密切接触者 PPD 强阳性率(PDD≥15 mm)为 50.9%,明显高于IGRA 阴性组的9.1%(X2 = 37.263,P < 0.00); IGRA 阳性组中,儿童结核病密切接触者发病率为 30.2%,明显高于IGRA 阴性组的 3.0%(X2 = 28.928,P < 0.00); IGRA 在儿童筛查结核病敏感性为 80.0%,特异性为77.6%;联合TST检测其敏感性达到95.0%.结论:对儿童结核病密切接触者开展IGRA筛查,可提高患者发现率和减少儿童结核病密切接触者影像学筛查.%Objective To study the feasibility of in vitro release of γ-interferon tests (IGRA) in screening of tuberculosis for children with close TB contacts. Methods 185 children with close TB contacts were detected by IGRA at the pediatric clinic in our hospital. Results In IGRA-positive group, the rate of strong positive PPD (PDD≥15 mm) was 50.9%, which was higher than 9.1% in IGRA-negative group (X2 =37.263, P < 0.00). The morbidity rate for children with close TB contacts was 30.2% in IGRA-positive group, and it was significantly higher than 3.0% in IGRA-negative group (X2 = 28.928, P < 0.00). The sensitivity was 80% and the specificity was 77.6% for IGRA screening in children who had close contacts with TB patients. The sensitivity would be 95.0%, as the test was combined with PPD test. Conclusions IGRA screening in children with close TB contacts can increase the detection rate of tuberculosis and reduce imaging screening.
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