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| Methods | Individual randomization. | |
| Participants | 261 PPD positive contacts of active cases in Royal Netherlands Navy barracks. | |
| Interventions | Isoniazid 600 mg for 4 months then 400 mg daily for total 1 years. | |
| Outcomes | 1. Active tuberculosis | |
| Notes | Close follow‐up and attention to compliance. | |
