Use of the QuantiFERON®-TB Gold test for screening tuberculosis contacts and predicting active disease
Abstract:OBJECTIVE: To evaluate the performance of the QuantiFERON®-TB Gold (QFT-G) test for screening tuberculosis (TB) contacts and estimating their risk of progressing to active TB disease.
METHODS: Data on clinical progression to active disease were collected from public health centres 2 years after close contacts of TB cases had been QFT-G-tested.
RESULTS: Among 3102 contacts observed, 419 were QFT-G-positive, and isoniazid (INH) treatment was initiated in 323. Twenty (4.8%) of these 419 developed TB disease. Among 2683 QFT-G-negative persons, 19 were diagnosed with TB (0.7%) during the average follow-up period of 1.6 years. The estimated sensitivity of QFT-G in detecting contacts who would progress to active TB was 51%, or 64% allowing for the effects of INH treatment. Among the QFT-G-negative contacts, all those who developed TB disease were contacts of highly infectious cases. Large-scale tuberculin skin testing was not available.
CONCLUSIONS: TB incidence among QFT-G-positive contacts was higher than among QFT-G-negative contacts, but the number of TB cases among QFT-G-negative contacts is non-negligible, especially among contacts of highly infectious cases.
Document Type: Regular Paper
Affiliations: 1: First Clinical Department, Fukujuji Hospital, Tokyo, Japan 2: Mycobacterium Reference and Research, Research Institute of Tuberculosis, Yokyo, Kiyose, Japan 3: Epidemiology and Clinical Research, Research Institute of Tuberculosis, Yokyo, Kiyose, Japan
Publication date: July 1, 2010
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