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).