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Oxacillin resistance phenotype of ‘OS-MRSA’ strain SA110—determined by population analysis (a) or Etest (b)—in the absence and presence of mupirocin added to the growth medium. (c) PFGE profiles of strain SA110 and two strains representing the MRSA clones USA500 and USA300. The PFGE profile of strain NCTC 8325 was also included as a control. Noteworthy, according to Li et al.,22 USA300 is derived from USA500.
