An official website of the United States government
Reported Tuberculosis in the United States, 2020
Table 25. Tuberculosis Cases and Clusters, by Cluster Size: United States, 2018–2020
See Surveillance Slide #68
| Cluster Size | Clusters1 | Cases2 | ||
|---|---|---|---|---|
| n | (%)3 | n | (%)4 | |
| Total | 1,280 | (100.0) | 3,687 | (100.0) |
| 2-case cluster | 860 | (67.2) | 1,720 | (46.7) |
| 3-case cluster | 215 | (16.8) | 645 | (17.5) |
| 4-case cluster | 85 | (6.6) | 340 | (9.2) |
| 5-case cluster | 41 | (3.2) | 205 | (5.6) |
| 6-case cluster | 22 | (1.7) | 132 | (3.6) |
| 7-case cluster | 11 | (0.9) | 77 | (2.1) |
| 8-case cluster | 11 | (0.9) | 88 | (2.4) |
| 9-case cluster | 8 | (0.6) | 72 | (2.0) |
| ≥10 case cluster | 27 | (2.1) | 408 | (11.1) |
1Clusters have two or more cases with matching spoligotype and 24-locus mycobacterial interspersed repetitive unit-variable number tandem repeat type (GENType) within a county during the specified 3-year time period.
2Cases with matching spoligotype and 24-locus mycobacterial interspersed repetitive unit-variable number tandem repeat type (GENType) are members of a cluster within a county during the specified 3-year time period.
3Denominator is total number of clusters
4Denominator is total number of cases
