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Linezolid is an important therapeutic option for infections caused by resistant gram-positive bacteria. We report the characterization of sequential methicillin-resistant Staphylococcus aureus (MRSA) bloodstream isolates that developed resistance in a patient treated with a prolonged course of linezolid. Analysis of this series of clinical MRSA isolates detected, in the resistant isolates, the presence of a T2500A mutation in the domain V region of the 23S rRNA gene. In addition, the loss of a single copy of the 23S rRNA gene was found in 2 of the resistant isolates. As a result of these 2 factors, the proportion of mutant : wild-type 23S rRNA genes increased in association with an increase in the minimum inhibitory concentration of linezolid. The most recent isolate of this series was recovered 7 months after the patient discontinued linezolid and demonstrated reversion to a susceptible phenotype associated with a loss of the T2500A mutation.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Linezolid Resistance in Sequential<i>Staphylococcus aureus</i>Isolates Associated with a T2500A Mutation in the 23S rRNA Gene and Loss of a Single Copy of rRNA

Linezolid Resistance in SequentialStaphylococcus aureusIsolates Associated with a T2500A Mutation in the 23S rRNA Gene and Loss of a Single Copy of rRNA