About
This table reports the number of cases of tuberculosis (TB) disease and whole-genome multilocus sequence type (wgMLSType) clusters by cluster size during 2022-2024.
Key Highlights
- During 2022–2024, there were 1,268 TB clusters involving 3,794 cases.
- Clusters of 2 or 3 cases comprised 85% of all clusters.
- There were 33 large clusters (≥10 cases) that represented 3% of all clusters and contained 599 cases (16% of all clustered cases).
Data Table
Tuberculosis Cases and wgMLSType Clusters by Cluster Size:1 United States, 2022–2024
| Cluster size | Clusters | Cases2 | ||
|---|---|---|---|---|
| No. | (%)3 | No. | (%)4 | |
| Total | 1,268 | (100.0) | 3,794 | (100.0) |
| 2 case cluster | 874 | (68.9) | 1,748 | (46.1) |
| 3 case cluster | 210 | (16.6) | 630 | (16.6) |
| 4 case cluster | 62 | (4.9) | 248 | (6.5) |
| 5 case cluster | 32 | (2.5) | 160 | (4.2) |
| 6 case cluster | 21 | (1.7) | 126 | (3.3) |
| 7 case cluster | 13 | (1.0) | 91 | (2.4) |
| 8 case cluster | 15 | (1.2) | 120 | (3.2) |
| 9 case cluster | 8 | (0.6) | 72 | (1.9) |
| ≥10 case cluster5 | 33 | (2.6) | 599 | (15.8) |
1Clusters have two or more cases with matching whole-genome multilocus sequence type (wgMLSType).
2Cases with matching wgMLSType are members of a cluster within a county during the specified 3-year time period.
3Percentages calculated based on the total number of clusters.
4Percentages calculated based on the total number of cases.
Notes
Data for all years are updated through July 10, 2025.