Table 5.

List of strains used in this study.

Strains	Main characteristics	References
S. aureus ATCC 25923	MSSA; fully-susceptible Recommended QC strain for antimicrobial susceptibility testing	Couto et al. (2008)20
S. aureus ATCC 25923_EtBr	S. aureus ATCC25923 adapted to 50 mg/L of EtBr Ciprofloxacin-resistant Overexpresses norA efflux pump gene	Couto et al. (2008)20
S. epidermidis ATCC 12228	MSSE	Costa et al. (2018)47
S. epidermidis ATCC12228_EtBr	S. epidermidis ATCC12228 adapted to 32 mg/L of EtBr Ciprofloxacin-resistant Overexpresses norA efflux pump gene	Costa et al. (2018)47
S. aureus SM1	MRSA; MDR phenotype Ciprofloxacin- resistant Mutations in GrlA QRDR: S80Y/E84G and GyrA QRDR: S84L	Costa et al. (2011, 2013, 2016)21,48,49
Enterococcus faecalis ATCC 29212	Recommended QC strain for antimicrobial susceptibility testing	Kim et al. (2012)50
E. coli ATCC 25922	Recommended QC strain for antimicrobial susceptibility testing	Sjolund et al. (2009)51
Salmonella enterica serotype Enteritidis NCTC 13349	Reference strain	Cerca et al. (2011)52
Klebsiella aerogenes ATCC 15038	Reference strain	Bornet et al. (2004)53

Note on acronyms: MSSA: methicillin-susceptible S. aureus; MSSE: methicillin-susceptible S. epidermidis; MRSA: methicillin-resistant S. aureus; QRDR: quinolone-resistance determining region; QC: quality control.