TABLE 2.
Susceptibilities of M. tuberculosis isolates as determined by the MGIT and the BACTEC 460TB systems
| Druga | Total no. of strains tested | No. of isolates with the following resultsb:
|
|||
|---|---|---|---|---|---|
| Both S | BACTEC S, MGIT R | BACTEC R, MGIT S | Both R | ||
| INH | 441 | 315 | 3 | 123 | |
| RMP | 441 | 347 | 4 | 90 | |
| EMB | |||||
| Expt 1 | 357 | 302 | 3 | 7 | 45 |
| Expt 2 | 312 | 254 | 2 | 4 | 52 |
| SM | 441 | 328 | 2 | 2 | 109 |
a
Drugs were used at the following concentrations (in micrograms per milliliter): INH, 0.1 (both systems); RMP, 1.0 (MGIT) and 2.0 (BACTEC 460TB); EMB, 3.5 (MGIT) and 2.5 (BACTEC 460TB) in experiment 1 and 3.5 (MGIT) and 3.75 (BACTEC 460TB) in experiment 2; and SM, 0.8 (MGIT) and 2.0 (BACTEC 460TB).
b
S, susceptible; R, resistant.