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Tuberculosis (TB) is the leading cause of infectious disease–related deaths worldwide. Nonetheless, active surveillance for potential cases of TB is performed in only a few countries with high TB incidence, because high-quality evidence on the practice is lacking. A multinational team of investigators now reports on a cluster-randomized controlled trial performed in 70 health districts in Vietnam, comparing active household contact investigation of TB patients along with passive case finding to passive case finding alone to identify contact patients with TB disease.
Over a 33-month period, healthcare workers identified 10,964 index TB cases and 25,707 household contacts. The rate of identified TB cases among household contacts was significan…