Correlation between the tuberculin skin test and T‑SPOT.TB in patients with suspected tuberculosis infection: A pilot study

Yang,Jing; Kong,Weiliang; Xv,Ning; Huang,Xiaoping; Chen,Xueqing

doi:10.3892/etm.2019.7791

Correlation between the tuberculin skin test and T‑SPOT.TB in patients with suspected tuberculosis infection: A pilot study

Authors:
- Jing Yang
- Weiliang Kong
- Ning Xv
- Xiaoping Huang
- Xueqing Chen
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Affiliations: Department of Respiratory Medicine, Ningbo First Hospital, Ningbo, Zhejiang 315010, P.R. China, Department of Traditional Medicine, Ningbo First Hospital, Ningbo, Zhejiang 315010, P.R. China
Published online on: July 18, 2019 https://doi.org/10.3892/etm.2019.7791
Pages: 2250-2254

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Abstract

T‑SPOT.TB is a novel screening method for Mycobacterium tuberculosis infection. However, it is controversial whether T‑SPOT.TB should become an alternative method to the tuberculin skin test (TST) for screening M. tuberculosis infections. The present study aimed to evaluate this issue based on the retrospective analysis of clinical cases. TST and T‑SPOT.TB tests were used on patients with suspected M. tuberculosis infection on admission. Demographic data and clinical information, including previous history of M. tuberculosis infection, were collected. A total of 118 patients were included in the analysis, among whom 30 (25.4%) were diagnosed with active M. tuberculosis infection, and seven patients (5.9%) were currently receiving immunosuppressive treatment. The overall sensitivity and specificity of the TST were 76.7 and 77.3%, respectively, while they were 88.3 and 68.1%, respectively, for the T‑SPOT.TB test. Patients with large TST indurations had a higher number of gamma interferon‑producing T cells among peripheral blood mononuclear cells compared with those of TST‑negative patients. In conclusion, the T‑SPOT.TB test had a higher sensitivity than the TST, but the difference was not statistically significant. Neither the T‑SPOT.TB test nor the TST was sufficiently accurate to detect active M. tuberculosis infection.

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