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Results of antimicrobial susceptibility testing of S. aureus ATCC25923. Em, erythromycin; Cc, clindamycin. (A) S. aureus carrying backbone plasmid, pBT2, was sensitive to both erythromycin and clindamycin. (B) S. aureus carrying pBT2-ermC showed constitutive MLS resistance. (C) S. aureus carrying pBT2-LP-ermC showed clindamycin resistance only on the disc side close to the erythromycin susceptibility test disc, resulting in inducible MLS resistance.
