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Distribution of the mutations found in katG, inhA, and the inhA promoter region according to the level of resistance to INH (high level in light gray; low level in dark gray). The y axis indicates the number of strains. *, mutations detected by the MTBDR assay (at position 315); **, 4 of the low-level INH-resistant strains with a mutation affecting inhA and/or its promoter cumulated a −15 C-to-T substitution plus a S94A mutation.
