δ- hemolysin production
The δ-hemolysis production was evaluated by cross-streaking perpendicularly our sample to S. aureus RN4220, using 5% sheep blood agar Columbia base with 6 mg/liter vancomycin, as previously described. The S. aureus reference strains Mu3 (hVISA) and MU50 (VISA) were used as controls for strong hemolysis activity, NRS149 (VSSA) was used as control for absent hemolysis activity (Cafisoet al ., 2012).