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Susceptibility index values of 5 of the 35 clinical isolates of M. tuberculosis tested after incubation for 24 h with or without various concentrations of INH. Isolates 497 (⧫), 941 (□), 810 (▴), and 065 (○) were susceptible to 0.02, 0.20, 1.0, or 5.0 μg or more of INH/ml, respectively. Isolate 024 (∗) was resistant to all concentrations of INH tested.
