Mutations in the rpsL and rrs genes were detected in 37.7% of streptomycin-resistant M. tuberculosis isolates. High-level resistance was associated with mutations in the rpsL gene, whereas wild-type isolates showed low MIC levels. The presence of the C491T substitution in the rrs gene in streptomycin-susceptible and -resistant isolates demonstrates that this change is an epidemiological marker associated with LAM3 sublineage.
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