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Table 3 Contact investigations: exposure of tuberculosis and QuantiFERON-TB Gold results compared with no exposure.

From: Diagnosis and follow-up of treatment of latent tuberculosis; the utility of the QuantiFERON-TB Gold In-tube assay in outpatients from a tuberculosis low-endemic country

TB case Exposure No (% of total) Pos QFT-TB (% of risk group)
Household 42 (8.7) 59.5
Family outside household 41 (8.5) 19.5
Work 104 (21.6) 15.5
Friends/occupational 59 (12.3) 39.0
School 10 (2.1) 40.0
Aeroplane 5 (1.0) 0
No reported exposure 220 (45.7) 32.3