This stab allows for the detection of streptolysin O, a specific hemolysin produced by Streptococcus pyogenes. This hemolysin is inactivated by O 2 and is only seen subsurface (in an anaerobic ...

This is in contrast to Streptococcus species, whose growth is selected against ... is capable of fermenting mannitol (left side of left plate) while Staphylococcus epidermidis is not (right side of ...