Table 5.
Proportion of Clustered Strains and Drug Resistant Strains Between the Different Sublineages of Beijing Strains, China, 2009–2010
| Beijing Sublineage | No. of Cases | Male Sex, (%) | Median Age, y (Range) | Treatment History, No. (%) of Casesa |
Drug-Resistant Cases, No. (%) |
Cases in Clusters, No. (%) | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| New Cases | Retreatment Cases | Unknown | DS | DR | MDR | |||||
| Total | 1031 | 70.9 | 43 (15–93) | 819 (79.4) | 121 (11.7) | 91 (8.8) | 862 (83.6) | 169 (16.4) | 70 (6.8) | 328 (31.8) |
| Modern | 773 | 72.2 | 49 (15–91) | 619 (80.1) | 87 (11.3) | 67 (8.7) | 654 (84.6) | 119 (15.4) | 48 (6.2) | 277 (35.8) |
| Ancient | 258 | 67.1 | 42 (15–93) | 200 (77.5) | 34 (13.2) | 24 (9.3) | 208 (80.6) | 50 (19.4) | 22 (8.5) | 51 (19.8) |
| Bmyc2 | 60 | 73.3 | 42 (18–84) | 46 (76.7) | 6 (10.0) | 8 (13.3) | 44 (73.3) | 16 (26.7) | 8 (13.3) | 18 (30.0) |
| Bmyc4 | 46 | 58.7 | 52 (15–93) | 33 (71.7) | 7 (15.2) | 6 (13.0) | 36 (78.3) | 10 (21.7) | 2 (4.3) | 12 (26.1) |
| Bmyc6 | 10 | 70.0 | 33 (18–80) | 7 (70.0) | 2 (20.0) | 1 (10.0) | 8 (80.0) | 2 (20.0) | 1 (10.0) | 0 (0) |
| Bmyc25 | 127 | 66.9 | 40 (15–88) | 103 (81.1) | 16 (12.6) | 8 (6.3) | 107 (84.3) | 20 (15.7) | 10 (7.9) | 21 (16.5) |
| Bmyc26 | 15 | 66.7 | 33 (15–67) | 11 (73.3) | 3 (20.0) | 1 (6.7) | 13 (86.7) | 2 (13.3) | 1 (6.7) | 0 (0) |
Abbreviations: DR, drug resistant; DS, drug susceptible; MDR, multidrug resistant, resistant to at least isoniazid and rifampin.
a Treatment history was available for 940 (91.2%) of the patients with tuberculosis of known sublineage.