Tuberculosis Contact Investigation Strategies
Summary
Contact investigation serves as a cornerstone of tuberculosis control, combining active case finding with preventive interventions to interrupt transmission chains. It involves systematic identification, screening and monitoring of individuals exposed to an index patient with infectious tuberculosis, typically prioritising household members and other close contacts. Strategies range from traditional home visits by trained health workers to community-based approaches that integrate mobile health technologies, social network mapping and human-centred design. Key objectives are the early detection of active disease, identification of latent infection for preventive therapy and linkage to care for high-risk groups such as young children and people living with HIV. Effective contact investigation requires rapid deployment of diagnostic tools, adherence support, and seamless referral pathways, while also addressing practical challenges such as stigma, loss to follow-up and resource constraints. Recent innovations emphasise digital data capture, tailored educational materials and community engagement to boost participation and improve yield. As tuberculosis elimination targets approach, robust contact investigation strategies remain essential to reduce incidence, prevent outbreaks and advance global public health goals.
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Tuberculosis Contact Investigation Strategies publication trend
The graph below shows the total number of articles in tuberculosis contact investigation strategies across all publications each year (not limited to Nature Index journals).
Technical terms
Index patient: The individual first diagnosed with active tuberculosis whose contacts are subsequently identified and assessed.
Household contact: A person sharing living space with an index patient, representing a priority group for screening and preventive treatment.
Interferon-gamma release assay (IGRA): A blood-based immunological test used to detect latent infection by measuring release of interferon-gamma in response to M. tuberculosis antigens.
Active case finding: The proactive search and screening of exposed individuals to uncover undiagnosed cases of tuberculosis.
Preventive therapy: Administration of antituberculosis drugs to contacts with latent infection to forestall progression to active disease.
References
- Incidence and risk factors of tuberculosis among 420 854 household contacts of patients with tuberculosis in the 100 Million Brazilian Cohort (2004–18): a cohort study. The Lancet Infectious Diseases (2023).
- Using mHealth Technologies for Case Finding in Tuberculosis and Other Infectious Diseases in Africa: Systematic Review. JMIR mHealth and uHealth (2024).
- Tuberculosis contact tracing, Angola. Bulletin of the World Health Organization (2024).
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