Table 6.

The S. aureus strains with known resistance mechanism used in the study.

S. aureus Strains	Resistance	Mechanism
1199B	ciprofloxacin	overexpression of the NorA efflux pump
RN4220-pUL5054	erythromycin	multicopy plasmid pUL5054 coding for MsrA
APH2″-AAC6′	gentamicin	experimentally induced aminoglycosides resistance by methylation of specific nucleotides within the A-site of rRNA (aminoglycoside- 6′-N-acetyltransferase/2″-O- phosphoryl transferase)
APH3′	kanamycin	experimentally induced aminoglycosides resistance by methylation of specific nucleotides within the A-site of rRNA (aminoglycoside-3′-O- phosphoryl transferase)
ANT4′	fusidic acid	experimentally induced aminoglycosides resistance by methylation of specific nucleotides within the A-site of rRNA (aminoglycoside-4′-O- phosphoryl transferase) is
MSSA ATCC25923 a	methicillin-sensitive	Control strain

^a Methicillin-sensitive strain (MSSA) used as a control for the current study.