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There are an estimated 9-14 million people in the United States infected with M. tuberculosis.  On average, about 10% of infected individuals will develop active tuberculosis (TB) disease at some point in their lives. There were 9,105 TB cases in the United States in 2017 (2.8 cases per 100,000 persons) – a 1.8% decrease compared to 2016. This is the lowest case count on record in the United States. Utah had 18 confirmed cases (0.6 cases per 100,000 persons) reported in 2018. 

Davis County had no new active tuberculosis disease cases reported in 2018 and 163 latent tuberculosis infection (LTBI) cases were managed by DCHD.

Active Tuberculosis Cases by Year, Davis County, 2002-2018


Latent tuberculosis infection is a condition in which TB bacteria are alive, but inactive in the body. People with LTBI have no symptoms, cannot spread TB to others, and usually have a positive skin test reaction or interferon gamma release assay (blood test). In 2018, a total of 163 LTBI cases were reported in Davis County.

Latent Tuberculosis Cases by Year, Davis County, 2002-2018


In Davis County, active disease and LTBI are primarily seen in individuals who are foreign-born or have traveled/lived in endemic countries.

 LTBI by Place of Birth, Davis County, 2017


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