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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