Reported Tuberculosis in the United States, 2017

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Recent transmission is evaluated using national TB molecular surveillance data. A case is estimated to be attributed to recent transmission if a plausible source case can be identified who: has the same M. tuberculosis genotype, has an infectious form of TB disease, resides within 10 miles of the case, is 10 years of age or older, and was diagnosed within 2 years prior to the case’s diagnosis date.[JPG - 6 MB]
Figure 1 – Estimated Cases Attributed to Recent Transmission of Tuberculosis, United States, 2016-2017

Recent transmission is evaluated using national TB molecular surveillance data. A case is estimated to be attributed to recent transmission if a plausible source case can be identified who: has the same M. tuberculosis genotype, has an infectious form of TB disease, resides within 10 miles of the case, is 10 years of age or older, and was diagnosed within 2 years prior to the case’s diagnosis date.
A map of the United States is displayed with state borders as well as county or county equivalent borders for those jurisdictions that had at least one genotyped TB case that could be evaluated for recent transmission during 2016-2017. Counts of cases attributed to recent transmission are shaded by county or county equivalent to depict relative numbers of cases attributed to recent transmission. All 50 states are shown; the New York City metropolitan area is represented as a zoomed in frame on the map. A total of 21 county or county equivalents (associated with large urban settings) had more than 20 TB cases attributed to recent transmission during 2016-2017.

 

A TB case is estimated to be attributed to extensive recent transmission when the case is attributed to recent transmission using the plausible source case method, and the case belongs to a plausible transmission chain of 6 or more cases within 3 years prior to the case’s diagnosis date.[JPG - 4 MB]
Figure 2 – Estimated Percentage of Extensive Recent Transmission of Tuberculosis in Counties with 10 or More Genotyped Cases, United States, 2016-2017

A TB case is estimated to be attributed to extensive recent transmission when the case is attributed to recent transmission using the plausible source case method, and the case belongs to a plausible transmission chain of 6 or more cases within 3 years prior to the case’s diagnosis date.
A map of the United States is displayed with state borders as well as county or county equivalent borders for those jurisdictions that had 10 or more genotyped TB cases that could be evaluated for recent transmission during 2016-2017. Percentages of genotyped cases attributed to extensive recent transmission are shaded by county or county equivalent to depict jurisdictions that are disproportionately affected by extensive recent transmission. All 50 states are shown; the New York City metropolitan area is represented as a zoomed in frame on the map. A total of 19 county or county equivalents had more than 20 percent of genotyped cases during 2016-2017 attributed to extensive recent transmission.