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Int J Tuberc Lung Dis. 2010 Jul;14(7):819-27.

Use of the QuantiFERON-TB Gold test for screening tuberculosis contacts and predicting active disease.

Author information

1
First Clinical Department, Fukujuji Hospital, Tokyo, Japan. yoshiyama1962@yahoo.co.jp

Abstract

OBJECTIVE:

To evaluate the performance of the QuantiFERON(R)-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.

PMID:
20550763
[Indexed for MEDLINE]

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