Reported Tuberculosis in the United States, 2018

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Estimates of Recent Transmission


Control of recent transmission is a vital component of the national TB elimination strategy.

To estimate recent transmission, CDC attributes TB cases to recent transmission if a plausible source case with a matching genotype and an infectious form of disease is identified in a patient who is ≥10 years of age, resides within a 10 mile radius, and has a diagnosis within 2 years before the given case.

These estimates may be used by state and local TB programs to monitor trends in their jurisdictions, and to assist in planning and prioritizing TB control activities.

Estimates of Recent Transmission Narrative

Page last reviewed: September 6, 2019