Bacteria photos: Staphylococcus aureus

Staphylococcus aureus colonies and beta-bemolysis

Staphylococcus aureus colonies on blood agar, beta-hemolysis

Staphylococcus aureus, Columbia agar with 5% defibrinated sheep blood. Cultivation 24 hours, aerobic atmosphere, 37°C.

Colonies in this strain are surroundend by a wide zone of beta-hemolysis (complete clearing = lysis of erythrocytes) and have only weak yellow pigmentation.
Compare with alpha-hemolysis of Streptococcus pneumoniae)