Comparing tuberculin skin test and interferon γ release assay (T-SPOT.TB) to diagnose latent tuberculosis infection in household contacts
The Korean Journal of Internal Medicine
;
: 486-496, 2017.
Article
in English
| WPRIM
| ID: wpr-138429
ABSTRACT
BACKGROUND/AIMS:
The tuberculin skin test (TST) and interferon γ release assay are currently used as diagnostic tools to detect latent tuberculosis (TB) infection; however, there are inconsistencies about the degree of agreement between the tests. We aimed to evaluate the concordance rate between the two tests in household contacts of a country with intermediate TB burden, where most people were vaccinated.METHODS:
We recruited household contacts who spent > 8 hours daily with patients with microbiologically confirmed active pulmonary TB, and received both TST and T-SPOT.TB (Oxford Immunotec) simultaneously. The degree of agreement was analysed according to TST cutoff and Bacille Calmette-Guerin (BCG) vaccination status. Relevant factors were analysed to establish the association with TST or T-SPOT.TB.RESULTS:
Among 298 household contacts, 122 (40.9%) were spouses, and 250 (83.9%) had received BCG vaccination. In the contact sources, 117 (39.3%) showed a positive result for acid-fast bacillus (AFB) sputum smear and 109 (36.6%) had cavities. The highest agreement rate of 69.5% and κ value of 0.378 were found with a 10 mm cutoff. Spouse, time interval from TB diagnosis to test, and AFB sputum smear positivity were significantly associated with a positive result for T-SPOT.TB. Sex, BCG vaccination, and cavity on chest computed tomography were related to TST positivity.CONCLUSIONS:
The present study suggested it was not possible for TST and T-SPOT.TB to replace each other because of considerable discrepancy between the two tests in household contacts in a country with intermediate TB prevalence.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Skin
/
Sputum
/
Thorax
/
Bacillus
/
Tuberculin
/
Skin Tests
/
Tuberculin Test
/
Family Characteristics
/
Prevalence
/
Interferons
Type of study:
Diagnostic study
/
Prevalence study
Limits:
Humans
Language:
English
Journal:
The Korean Journal of Internal Medicine
Year:
2017
Type:
Article
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