Detection of embB306 mutations in ethambutol-susceptible clinical isolates of Mycobacterium tuberculosis from Northwestern Russia: implications for genotypic resistance testing.

Abstract excerpt

A total of 183 epidemiologically unlinked Mycobacterium tuberculosis isolates collected in the St. Petersburg area of Russia from 1996 to 2001 were screened for alterations in codon 306 of the embB gene; mutations in this codon are reported to confer resistance to ethambutol (EMB). The embB306 mutations were detected in 14 (48.3%) of 29 EMB-resistant strains and, quite surprisingly, in 48 (31.2%) of 154...

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