Reported Tuberculosis in the United States, 2017

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Table 59. Characteristics of Tuberculosis Cases Estimated to be Attributed to Recent Transmission and Extensive Recent Transmission: United States, 2016–2017

Table 59. Characteristics of Tuberculosis Cases Estimated to be Attributed to Overall and Extensive Recent Transmission: United States, 2016-2017
Case Characteristics Total Genotyped Cases1 Cases Not Attributed to Recent Transmission Cases Attributed to Recent Transmission2 Cases Attributed to Extensive Recent Transmission3
No. (%) No. (%) No. (%)
Total 13,650 11,863 (86.9) 1,787 (13.1) 625 (4.6)
Origin of Birth
U.S-born 4,019 2,988 (74.3) 1,031 (25.6) 427 (10.6)
Non-U.S.–born 9,613 8,860 (92.1) 753 (7.8) 197 (2.0)
Unknown or Missing 18 15 (83.3) 3 (16.7) 1 (5.6)
Race and Ethnicity
Hispanic/Latino 3,693 3,185 (86.2) 508 (13.8) 152 (4.1)
American Indian/Alaska Native 168 109 (64.9) 59 (35.1) 34 (20.2)
Asian 5,045 4,656 (92.3) 389 (7.7) 116 (2.3)
Black or African American 2,808 2,231 (79.4) 577 (20.5) 243 (8.6)
Native Hawaiian/Other Pacific Islander 129 105 (81.4) 24 (18.6) 6 (4.6)
 White 1,662 1,454 (87.5) 208 (12.5) 68 (4.1)
Multiple Race 107 89 (83.2) 18 (16.8) 6 (5.6)
Unknown or Missing 38 34 (89.5) 4 (10.5) 0 (0.0)
Age Group (Years)
0–4 126 74 (58.7) 52 (41.3) 8 (6.3)
5–14 119 93 (78.2) 26 (21.8) 9 (7.6)
15–24 1,324 1,122 (84.7) 202 (15.2) 67 (5.1)
25–44 4,202 3,616 (86.0) 586 (13.9) 202 (4.8)
45–64 4,180 3,552 (85.0) 628 (15.0) 238 (5.7)
≥65 3,694 3,401 (92.1) 293 (7.9) 101 (2.7)
Unknown 5 5 (100.0) 0 (0.0) 0 (0.0)
Disease Site
Pulmonary Only 10,001 8,569 (85.7) 1,432 (14.3) 503 (5.0)
Extrapulmonary 2,087 1,899 (91.0) 188 (9.0) 65 (3.1)
Both 1,553 1,387 (89.3) 166 (10.7) 56 (3.6)
Unknown 9 8 (88.9) 1 (11.1) 1 (11.1)
Sputum Smear 
Positive 6,318 5,411 (85.6) 907 (14.4) 330 (5.2)
Negative 5,403 4,742 (87.8) 661 (12.2) 225 (4.2)
Not Done 1,914 1,695 (88.6) 219 (11.4) 70 (3.6)
Unknown or Missing 15 15 (100.0) 0 (0.0) 0 (0.0)
Cavitary Disease4
Yes 123 106 (86.2) 17 (13.8) 7 (5.7)
No 1,108 985 (88.9) 123 (11.1) 42 (3.8)
Unknown or Missing 3 3 (100.0) 0 (0.0) 0 (0.0)
Homeless Within Past Year
Yes 677 463 (68.4) 214 (31.6) 110 (16.2)
No 12,891 11,333 (87.9) 1,558 (12.1) 511 (4.0)
Unknown or Missing 82 67 (81.7) 15 (18.3) 4 (4.9)
Excess Alcohol Use Within the Past Year
Yes 1,363 1,000 (73.4) 363 (26.6) 146 (10.7)
No 12,073 10,689 (88.5) 1,384 (11.5) 464 (3.8)
Unknown or Missing 214 174 (81.3) 40 (18.7) 15 (7.0)
Injecting Illicit Drug Use Within Past Year
Yes 165 118 (71.5) 47 (28.5) 18 (10.9)
No 13,286 11,585 (87.2) 1,701 (12.8) 595 (4.5)
Unknown or Missing 199 160 (80.4) 39 (19.6) 12 (6.0)
Noninjecting Illicit Drug Use Within Past Year
Yes 978 667 (68.2) 311 (31.8) 141 (14.4)
No 12,480 11,040 (88.5) 1,440 (11.5) 474 (3.8)
Unknown or Missing 192 156 (81.2) 36 (18.8) 10 (5.2)
Resident of a Correctional Facility at the Time of Diagnosis
Yes 431 348 (80.7) 83 (19.2) 40 (9.3)
No 13,112 11,426 (87.1) 1,686 (12.8) 582 (4.4)
Unknown or Missing 107 89 (83.2) 18 (16.8) 3 (2.8)
HIV Status
Positive 681 570 (83.7) 111 (16.3) 52 (7.6)
Negative 11,512 9,983 (86.7) 1,529 (13.3) 527 (4.6)
Refused 270 243 (90.0) 27 (10.0) 11 (4.1)
Not Offered 793 709 (89.4) 84 (10.6) 29 (3.6)
Unknown, Missing or Indeterminate 394 358 (90.9) 36 (9.1) 6 (1.5)
Multidrug-Resistant TB
Yes 215 184 (85.6) 31 (14.4) 10 (4.6)
No 12,736 11,070 (86.9) 1,666 (13.1) 588 (4.6)
Unknown or Missing 699 609 (87.1) 90 (12.9) 27 (3.8)

1 Total number of M. tuberculosis genotyped cases that are eligible to be evaluated for recent transmission (i.e., complete data for the plausible-source case method’s algorithm).
2 Number of cases attributed to recent transmission includes any given case with a plausible source case regardless of cluster size.
3 Number of cases attributed to extensive recent transmission includes only cases in a plausible chain of transmission of six or more cases (five secondary and one source case).
4 Cavitary disease only assessed for persons with pulmonary TB and an abnormal x-ray.

Page last reviewed: October 22, 2018