Fig 1. Participant enrollment and baseline evaluation results for contacts (N = 314).

Contacts were eligible for isoniazid preventive therapy (IPT) if they were exposed to drug-sensitive pulmonary TB and either <5 years old or 5–19 years old with a positive tuberculin skin test (TST) result. Contacts exposed to drug-resistant or extrapulmonary TB were ineligible for IPT. Contacts 5–19 years old without a TST were categorized as having undetermined IPT eligibility.