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Methicillin-resistant Staphylococcus aureus with a MIC of linezolid of 4 μg/ml, isolated from a patient who had undergone unsuccessful linezolid therapy, yielded linezolid-resistant mutants in blood agar at 48 h of incubation. The resistant clones showed a MIC of linezolid ranging from 8 to 64 μg/ml and accumulated the T2500A mutation(s) of the rRNA genes. Emergence of these resistant clones appears to be facilitated by a cryptic mutation or mutations associated with chloramphenicol resistance.
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Ikeda-Dantsuji et al. (2011) studied this question.
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