If no hemolysis occurs, this is termed gamma-hemolysis. There are no notable zones around the colonies. Staphylococcus epidermidisis gamma-hemolytic. Often when inoculating a BAP to observe hemoloysis ...

Thus beta-hemolysis in the stab shows the presence of Streptolysin O. These are both produced by the organisms Streptococcus pyogenes. Observe your BAP plates for hemolysis patterns. Beta-hemolysis: ...