Incidence and relative risks for active TB in HIV-infected individuals with positive TST, T-SPOT.TB and dual positive results, compared with individuals with negative results.

Definition of abbreviations: BCG = Bacille Calmette-Guérin; CI = confidence interval; IPT = isoniazid preventive therapy; PY = person-year; TST = tuberculin skin test. RR = relative risk.*Relative risk was calculated by Poisson regression method and the cell with “zero case” was assigned to 0.5 for calculation.Individuals with IPT were excluded.