Virulence factor. Causes hemolysis of erythrocytes from sheep (HD(50)=4.79 mM), rabbit (HD(50)=8.76 mM), guinea pig (HD(50)=2.00 mM), dog (HD(50)=5.35 mM) and human (HD(50)=6.34 mM). Acts synergistically with beta-hemolysins from S.aureus ATCC 25923. Cytotoxic towards human dermal fibroblasts.