Table 2.

Susceptibilities of M. tuberculosis isolates as determined by the MGIT and the BACTEC 460TB systems

DrugaTotal no. of strains testedNo. of isolates with the following resultsb:
Both SBACTEC S, MGIT RBACTEC R, MGIT SBoth R
INH4413153123
RMP441347490
EMB
 Expt 13573023745
 Expt 23122542452
SM44132822109
  • 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.